update boost & add container lib (#204)

* remove boost headers

* boost 1.78

CMakeLists.txt

@@ -13,7 +13,7 @@ include(${CMAKE_CURRENT_LIST_DIR}/sources/CMakeLists.txt)
 
 if(WINDOWS)
     if(${CMAKE_SIZEOF_VOID_P} STREQUAL "4")
-        include(${CMAKE_CURRENT_LIST_DIR}/win32/CMakeLists.txt)    
+        include(${CMAKE_CURRENT_LIST_DIR}/win32/CMakeLists.txt)
     else()
         include(${CMAKE_CURRENT_LIST_DIR}/win64/CMakeLists.txt)
     endif()

sources/CMakeLists.txt

@@ -24,7 +24,6 @@ set(CC_UTILS_SOURCES
   ${CMAKE_CURRENT_LIST_DIR}/xxtea/xxtea.h
 )
 
-
 set(CC_EXTERNAL_SOURCES
 
   ${CMAKE_CURRENT_LIST_DIR}/tommyds/tommy.c
@@ -32,13 +31,16 @@ set(CC_EXTERNAL_SOURCES
 )
 
 if(NOT USE_MODULES)
-  list(APPEND CC_EXTERNAL_SOURCES 
+  list(APPEND CC_EXTERNAL_SOURCES
     ${CC_UNZIP_SOURCES}
     ${CC_TINYDIR_SOURCES}
     ${CC_UTILS_SOURCES}
   )
 endif()
 
+# add dependent boost libs
+include(${CMAKE_CURRENT_LIST_DIR}/boost-source/boost.cmake)
+
 if(ANDROID OR OHOS)
 
   include(${CMAKE_CURRENT_LIST_DIR}/pvmp3dec/CMakeLists.txt)
@@ -70,4 +72,3 @@ if(USE_PHYSICS_PHYSX)
     ${CMAKE_CURRENT_LIST_DIR}/PhysX/PxShared/include
   )
 endif()
-

sources/boost-source/boost.cmake

@@ -0,0 +1,14 @@
+
+list(APPEND CC_EXTERNAL_PRIVATE_DEFINITIONS BOOST_ALL_NO_LIB)
+
+add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/container boost/container)
+
+set(BOOST_LIBS
+    boost_container
+)
+
+foreach(lib ${BOOST_LIBS})
+    set_target_properties(${lib} PROPERTIES FOLDER Utils)
+endforeach()
+
+list(APPEND CC_EXTERNAL_LIBS ${BOOST_LIBS})

sources/boost-source/container/CMakeLists.txt

@@ -0,0 +1,37 @@
+# Copyright 2020, 2021 Peter Dimov
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+
+cmake_minimum_required(VERSION 3.5...3.16)
+
+project(boost_container VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES C CXX)
+
+add_library(boost_container
+  alloc_lib.c
+  dlmalloc.cpp
+  global_resource.cpp
+  monotonic_buffer_resource.cpp
+  pool_resource.cpp
+  synchronized_pool_resource.cpp
+  unsynchronized_pool_resource.cpp
+)
+
+add_library(Boost::container ALIAS boost_container)
+
+target_compile_definitions(boost_container
+  PUBLIC BOOST_CONTAINER_NO_LIB
+  # Source files already define BOOST_CONTAINER_SOURCE
+  # PRIVATE BOOST_CONTAINER_SOURCE
+)
+
+if(BUILD_SHARED_LIBS)
+  target_compile_definitions(boost_container PUBLIC BOOST_CONTAINER_DYN_LINK)
+else()
+  target_compile_definitions(boost_container PUBLIC BOOST_CONTAINER_STATIC_LINK)
+endif()
+
+if(BUILD_TESTING AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt")
+
+  add_subdirectory(test)
+
+endif()

sources/boost-source/container/alloc_lib.c

@@ -0,0 +1,27 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2012-2013. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+#define DLMALLOC_VERSION 286
+
+#ifndef DLMALLOC_VERSION
+   #error "DLMALLOC_VERSION undefined"
+#endif
+
+#ifdef __VXWORKS__
+// no sbrk() in VxWorks, configure dlmalloc to use only mmap() 
+#define HAVE_MORECORE 0
+#endif 
+
+#if DLMALLOC_VERSION == 286
+   #include "dlmalloc_ext_2_8_6.c"
+#else
+   #error "Unsupported boost_cont_VERSION version"
+#endif

sources/boost-source/container/dlmalloc.cpp

@@ -0,0 +1,108 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2012-2013. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#define BOOST_CONTAINER_SOURCE
+#include <boost/container/detail/dlmalloc.hpp>
+
+namespace boost{
+namespace container{
+
+BOOST_CONTAINER_DECL size_t dlmalloc_size(const void *p)
+{  return boost_cont_size(p);  }
+
+BOOST_CONTAINER_DECL void* dlmalloc_malloc(size_t bytes)
+{  return boost_cont_malloc(bytes);  }
+
+BOOST_CONTAINER_DECL void  dlmalloc_free(void* mem)
+{  return boost_cont_free(mem);  }
+
+BOOST_CONTAINER_DECL void* dlmalloc_memalign(size_t bytes, size_t alignment)
+{  return boost_cont_memalign(bytes, alignment);  }
+
+BOOST_CONTAINER_DECL int dlmalloc_multialloc_nodes
+   (size_t n_elements, size_t elem_size, size_t contiguous_elements, boost_cont_memchain *pchain)
+{  return boost_cont_multialloc_nodes(n_elements, elem_size, contiguous_elements, pchain);  }
+
+BOOST_CONTAINER_DECL int dlmalloc_multialloc_arrays
+   (size_t n_elements, const size_t *sizes, size_t sizeof_element, size_t contiguous_elements, boost_cont_memchain *pchain)
+{  return boost_cont_multialloc_arrays(n_elements, sizes, sizeof_element, contiguous_elements, pchain); }
+
+BOOST_CONTAINER_DECL void dlmalloc_multidealloc(boost_cont_memchain *pchain)
+{  return boost_cont_multidealloc(pchain); }
+
+BOOST_CONTAINER_DECL size_t dlmalloc_footprint()
+{  return boost_cont_footprint(); }
+
+BOOST_CONTAINER_DECL size_t dlmalloc_allocated_memory()
+{  return boost_cont_allocated_memory(); }
+
+BOOST_CONTAINER_DECL size_t dlmalloc_chunksize(const void *p)
+{  return boost_cont_chunksize(p); }
+
+BOOST_CONTAINER_DECL int dlmalloc_all_deallocated()
+{  return boost_cont_all_deallocated(); }
+
+BOOST_CONTAINER_DECL boost_cont_malloc_stats_t dlmalloc_malloc_stats()
+{  return boost_cont_malloc_stats(); }
+
+BOOST_CONTAINER_DECL size_t dlmalloc_in_use_memory()
+{  return boost_cont_in_use_memory(); }
+
+BOOST_CONTAINER_DECL int dlmalloc_trim(size_t pad)
+{  return boost_cont_trim(pad); }
+
+BOOST_CONTAINER_DECL int dlmalloc_mallopt(int parameter_number, int parameter_value)
+{  return boost_cont_mallopt(parameter_number, parameter_value); }
+
+BOOST_CONTAINER_DECL int dlmalloc_grow
+   (void* oldmem, size_t minbytes, size_t maxbytes, size_t *received)
+{  return boost_cont_grow(oldmem, minbytes, maxbytes, received); }
+
+BOOST_CONTAINER_DECL int dlmalloc_shrink
+   (void* oldmem, size_t minbytes, size_t maxbytes, size_t *received, int do_commit)
+{  return boost_cont_shrink(oldmem, minbytes, maxbytes, received, do_commit); }
+
+BOOST_CONTAINER_DECL void* dlmalloc_alloc
+   (size_t minbytes, size_t preferred_bytes, size_t *received_bytes)
+{  return boost_cont_alloc(minbytes, preferred_bytes, received_bytes); }
+
+BOOST_CONTAINER_DECL int dlmalloc_malloc_check()
+{  return boost_cont_malloc_check(); }
+
+BOOST_CONTAINER_DECL boost_cont_command_ret_t dlmalloc_allocation_command
+   ( allocation_type command
+   , size_t sizeof_object
+   , size_t limit_objects
+   , size_t preferred_objects
+   , size_t *received_objects
+   , void *reuse_ptr
+   )
+{  return boost_cont_allocation_command(command, sizeof_object, limit_objects, preferred_objects, received_objects, reuse_ptr); }
+
+BOOST_CONTAINER_DECL void *dlmalloc_sync_create()
+{  return boost_cont_sync_create();  }
+
+BOOST_CONTAINER_DECL void dlmalloc_sync_destroy(void *sync)
+{  return boost_cont_sync_destroy(sync);  }
+
+BOOST_CONTAINER_DECL bool dlmalloc_sync_lock(void *sync)
+{  return boost_cont_sync_lock(sync) != 0;  }
+
+BOOST_CONTAINER_DECL void dlmalloc_sync_unlock(void *sync)
+{  return boost_cont_sync_unlock(sync);  }
+
+BOOST_CONTAINER_DECL bool dlmalloc_global_sync_lock()
+{  return boost_cont_global_sync_lock() != 0;  }
+
+BOOST_CONTAINER_DECL void dlmalloc_global_sync_unlock()
+{  return boost_cont_global_sync_unlock();  }
+
+}  //namespace container{
+}  //namespace boost{

sources/boost-source/container/global_resource.cpp

@@ -0,0 +1,121 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2015-2015. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#define BOOST_CONTAINER_SOURCE
+#include <boost/container/pmr/memory_resource.hpp>
+#include <boost/container/pmr/global_resource.hpp>
+#include <boost/core/no_exceptions_support.hpp>
+#include <boost/container/throw_exception.hpp>
+#include <boost/container/detail/dlmalloc.hpp>  //For global lock
+#include <boost/container/detail/singleton.hpp>
+
+#include <cstddef>
+#include <new>
+
+namespace boost {
+namespace container {
+namespace pmr {
+
+class new_delete_resource_imp
+   : public memory_resource
+{
+   public:
+
+   ~new_delete_resource_imp() BOOST_OVERRIDE
+   {}
+
+   void* do_allocate(std::size_t bytes, std::size_t alignment) BOOST_OVERRIDE
+   {  (void)bytes; (void)alignment; return new char[bytes];  }
+
+   void do_deallocate(void* p, std::size_t bytes, std::size_t alignment) BOOST_OVERRIDE
+   {  (void)bytes; (void)alignment; delete[]((char*)p);  }
+
+   bool do_is_equal(const memory_resource& other) const BOOST_NOEXCEPT BOOST_OVERRIDE
+   {  return &other == this;   }
+};
+
+struct null_memory_resource_imp
+   : public memory_resource
+{
+   public:
+
+   ~null_memory_resource_imp() BOOST_OVERRIDE
+   {}
+
+   void* do_allocate(std::size_t bytes, std::size_t alignment) BOOST_OVERRIDE
+   {
+      (void)bytes; (void)alignment;
+      #if defined(BOOST_CONTAINER_USER_DEFINED_THROW_CALLBACKS) || defined(BOOST_NO_EXCEPTIONS)
+      throw_bad_alloc();
+      #else
+      throw std::bad_alloc();
+      #endif
+
+      return 0;
+   }
+
+   void do_deallocate(void* p, std::size_t bytes, std::size_t alignment) BOOST_OVERRIDE
+   {  (void)p;  (void)bytes; (void)alignment;  }
+
+   bool do_is_equal(const memory_resource& other) const BOOST_NOEXCEPT BOOST_OVERRIDE
+   {  return &other == this;   }
+};
+
+BOOST_CONTAINER_DECL memory_resource* new_delete_resource() BOOST_NOEXCEPT
+{
+   return &boost::container::dtl::singleton_default<new_delete_resource_imp>::instance();
+}
+
+BOOST_CONTAINER_DECL memory_resource* null_memory_resource() BOOST_NOEXCEPT
+{
+   return &boost::container::dtl::singleton_default<null_memory_resource_imp>::instance();
+}
+
+static memory_resource *default_memory_resource =
+   &boost::container::dtl::singleton_default<new_delete_resource_imp>::instance();
+
+BOOST_CONTAINER_DECL memory_resource* set_default_resource(memory_resource* r) BOOST_NOEXCEPT
+{
+   //TO-DO: synchronizes-with part using atomics
+   if(dlmalloc_global_sync_lock()){
+      memory_resource *previous = default_memory_resource;
+      if(!previous){
+         //function called before main, default_memory_resource is not initialized yet
+         previous = new_delete_resource();
+      }
+      default_memory_resource = r ? r : new_delete_resource();
+      dlmalloc_global_sync_unlock();
+      return previous;
+   }
+   else{
+      return new_delete_resource();
+   }
+}
+
+BOOST_CONTAINER_DECL memory_resource* get_default_resource() BOOST_NOEXCEPT
+{
+   //TO-DO: synchronizes-with part using atomics
+   if(dlmalloc_global_sync_lock()){
+      memory_resource *current = default_memory_resource;
+      if(!current){
+         //function called before main, default_memory_resource is not initialized yet
+         current = new_delete_resource();
+      }
+      dlmalloc_global_sync_unlock();
+      return current;
+   }
+   else{
+      return new_delete_resource();
+   }
+}
+
+}  //namespace pmr {
+}  //namespace container {
+}  //namespace boost {

sources/boost-source/container/monotonic_buffer_resource.cpp

@@ -0,0 +1,175 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2015-2015. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#define BOOST_CONTAINER_SOURCE
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+
+#include <boost/container/pmr/monotonic_buffer_resource.hpp>
+#include <boost/container/pmr/global_resource.hpp>
+
+#include <boost/container/detail/min_max.hpp>
+#include <boost/intrusive/detail/math.hpp>
+#include <boost/container/throw_exception.hpp>
+#include <new>
+
+
+#include <cstddef>
+
+namespace {
+
+#ifdef BOOST_HAS_INTPTR_T
+typedef boost::uintptr_t   uintptr_type;
+#else
+typedef std::size_t        uintptr_type;
+#endif
+
+static const std::size_t minimum_buffer_size = 2*sizeof(void*);
+
+}  //namespace {
+
+namespace boost {
+namespace container {
+namespace pmr {
+
+void monotonic_buffer_resource::increase_next_buffer()
+{
+   m_next_buffer_size = (std::size_t(-1)/2 < m_next_buffer_size) ? std::size_t(-1) : m_next_buffer_size*2;
+}
+
+void monotonic_buffer_resource::increase_next_buffer_at_least_to(std::size_t minimum_size)
+{
+   if(m_next_buffer_size < minimum_size){
+      if(bi::detail::is_pow2(minimum_size)){
+         m_next_buffer_size = minimum_size;
+      }
+      else if(std::size_t(-1)/2 < minimum_size){
+         m_next_buffer_size = minimum_size;
+      }
+      else{
+         m_next_buffer_size = bi::detail::ceil_pow2(minimum_size);
+      }
+   }
+}
+
+monotonic_buffer_resource::monotonic_buffer_resource(memory_resource* upstream) BOOST_NOEXCEPT
+   : m_memory_blocks(upstream ? *upstream : *get_default_resource())
+   , m_current_buffer(0)
+   , m_current_buffer_size(0u)
+   , m_next_buffer_size(initial_next_buffer_size)
+   , m_initial_buffer(0)
+   , m_initial_buffer_size(0u)
+{}
+
+monotonic_buffer_resource::monotonic_buffer_resource(std::size_t initial_size, memory_resource* upstream) BOOST_NOEXCEPT
+   : m_memory_blocks(upstream ? *upstream : *get_default_resource())
+   , m_current_buffer(0)
+   , m_current_buffer_size(0u)
+   , m_next_buffer_size(minimum_buffer_size)
+   , m_initial_buffer(0)
+   , m_initial_buffer_size(0u)
+{                                         //In case initial_size is zero
+   this->increase_next_buffer_at_least_to(initial_size + !initial_size);
+}
+
+monotonic_buffer_resource::monotonic_buffer_resource(void* buffer, std::size_t buffer_size, memory_resource* upstream) BOOST_NOEXCEPT
+   : m_memory_blocks(upstream ? *upstream : *get_default_resource())
+   , m_current_buffer(buffer)
+   , m_current_buffer_size(buffer_size)
+   , m_next_buffer_size
+      (bi::detail::previous_or_equal_pow2
+         (boost::container::dtl::max_value(buffer_size, std::size_t(initial_next_buffer_size))))
+   , m_initial_buffer(buffer)
+   , m_initial_buffer_size(buffer_size)
+{  this->increase_next_buffer(); }
+
+monotonic_buffer_resource::~monotonic_buffer_resource()
+{  this->release();  }
+
+void monotonic_buffer_resource::release() BOOST_NOEXCEPT
+{
+   m_memory_blocks.release();
+   m_current_buffer = m_initial_buffer;
+   m_current_buffer_size = m_initial_buffer_size;
+   m_next_buffer_size = initial_next_buffer_size;
+}
+
+memory_resource* monotonic_buffer_resource::upstream_resource() const BOOST_NOEXCEPT
+{  return &m_memory_blocks.upstream_resource();   }
+
+std::size_t monotonic_buffer_resource::remaining_storage(std::size_t alignment, std::size_t &wasted_due_to_alignment) const BOOST_NOEXCEPT
+{
+   const uintptr_type up_alignment_minus1 = alignment - 1u;
+   const uintptr_type up_alignment_mask = ~up_alignment_minus1;
+   const uintptr_type up_addr = uintptr_type(m_current_buffer);
+   const uintptr_type up_aligned_addr = (up_addr + up_alignment_minus1) & up_alignment_mask;
+   wasted_due_to_alignment = std::size_t(up_aligned_addr - up_addr);
+   return m_current_buffer_size <= wasted_due_to_alignment ? 0u : m_current_buffer_size - wasted_due_to_alignment;
+}
+
+std::size_t monotonic_buffer_resource::remaining_storage(std::size_t alignment) const BOOST_NOEXCEPT
+{
+   std::size_t ignore_this;
+   return this->remaining_storage(alignment, ignore_this);
+}
+
+const void *monotonic_buffer_resource::current_buffer() const BOOST_NOEXCEPT
+{  return m_current_buffer;  }
+
+std::size_t monotonic_buffer_resource::next_buffer_size() const BOOST_NOEXCEPT
+{  return m_next_buffer_size;  }
+
+void *monotonic_buffer_resource::allocate_from_current(std::size_t aligner, std::size_t bytes)
+{
+   char * p = (char*)m_current_buffer + aligner;
+   m_current_buffer = p + bytes;
+   m_current_buffer_size -= aligner + bytes;
+   return p;
+}
+
+void* monotonic_buffer_resource::do_allocate(std::size_t bytes, std::size_t alignment)
+{
+   if(alignment > memory_resource::max_align){
+     (void)bytes; (void)alignment;
+      #if defined(BOOST_CONTAINER_USER_DEFINED_THROW_CALLBACKS) || defined(BOOST_NO_EXCEPTIONS)
+      throw_bad_alloc();
+      #else
+      throw std::bad_alloc();
+      #endif
+   }
+
+   //See if there is room in current buffer
+   std::size_t aligner = 0u;
+   if(this->remaining_storage(alignment, aligner) < bytes){
+      //The new buffer will be aligned to the strictest alignment so reset
+      //the aligner, which was needed for the old buffer.
+      aligner = 0u;
+      //Update next_buffer_size to at least bytes
+      this->increase_next_buffer_at_least_to(bytes);
+      //Now allocate and update internal data
+      m_current_buffer = (char*)m_memory_blocks.allocate(m_next_buffer_size);
+      m_current_buffer_size = m_next_buffer_size;
+      this->increase_next_buffer();
+   }
+   //Enough internal storage, extract from it
+   return this->allocate_from_current(aligner, bytes);
+}
+
+void monotonic_buffer_resource::do_deallocate(void* p, std::size_t bytes, std::size_t alignment) BOOST_NOEXCEPT
+{  (void)p; (void)bytes;  (void)alignment;  }
+
+bool monotonic_buffer_resource::do_is_equal(const memory_resource& other) const BOOST_NOEXCEPT
+{  return this == &other;  }
+
+}  //namespace pmr {
+}  //namespace container {
+}  //namespace boost {
+
+#include <boost/container/detail/config_end.hpp>

sources/boost-source/container/pool_resource.cpp

@@ -0,0 +1,287 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2015-2015. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#define BOOST_CONTAINER_SOURCE
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+
+#include <boost/container/pmr/global_resource.hpp>
+
+#include <boost/container/detail/pool_resource.hpp>
+#include <boost/container/detail/block_slist.hpp>
+#include <boost/container/detail/min_max.hpp>
+#include <boost/container/detail/placement_new.hpp>
+#include <boost/intrusive/linear_slist_algorithms.hpp>
+#include <boost/intrusive/detail/math.hpp>
+
+#include <cstddef>
+
+namespace boost {
+namespace container {
+namespace pmr {
+
+//pool_data_t
+
+class pool_data_t
+   : public block_slist_base<>
+{
+   typedef block_slist_base<> block_slist_base_t;
+
+   public:
+   explicit pool_data_t(std::size_t initial_blocks_per_chunk)
+      : block_slist_base_t(), next_blocks_per_chunk(initial_blocks_per_chunk)
+   {  slist_algo::init_header(&free_slist);  }
+
+   void *allocate_block() BOOST_NOEXCEPT
+   {
+      if(slist_algo::unique(&free_slist)){
+         return 0;
+      }
+      slist_node *pv = slist_algo::node_traits::get_next(&free_slist);
+      slist_algo::unlink_after(&free_slist);
+      pv->~slist_node();
+      return pv;
+   }
+
+   void deallocate_block(void *p) BOOST_NOEXCEPT
+   {
+      slist_node *pv = ::new(p, boost_container_new_t()) slist_node();
+      slist_algo::link_after(&free_slist, pv);
+   }
+
+   void release(memory_resource &upstream)
+   {
+      slist_algo::init_header(&free_slist);
+      this->block_slist_base_t::release(upstream);
+      next_blocks_per_chunk = pool_options_minimum_max_blocks_per_chunk;
+   }
+
+   void replenish(memory_resource &mr, std::size_t pool_block, std::size_t max_blocks_per_chunk)
+   {
+      //Limit max value
+      std::size_t blocks_per_chunk = boost::container::dtl::min_value(max_blocks_per_chunk, next_blocks_per_chunk);
+      //Avoid overflow
+      blocks_per_chunk = boost::container::dtl::min_value(blocks_per_chunk, std::size_t(-1)/pool_block);
+      
+      //Minimum block size is at least max_align, so all pools allocate sizes that are multiple of max_align,
+      //meaning that all blocks are max_align-aligned.
+      char *p = static_cast<char *>(block_slist_base_t::allocate(blocks_per_chunk*pool_block, mr));
+
+      //Create header types. This is no-throw
+      for(std::size_t i = 0, max = blocks_per_chunk; i != max; ++i){
+         slist_node *const pv = ::new(p, boost_container_new_t()) slist_node();
+         slist_algo::link_after(&free_slist, pv);
+         p += pool_block;
+      }
+
+      //Update next block per chunk         
+      next_blocks_per_chunk = max_blocks_per_chunk/2u < blocks_per_chunk  ? max_blocks_per_chunk : blocks_per_chunk*2u;
+   }
+
+   std::size_t cache_count() const
+   {  return slist_algo::count(&free_slist) - 1u;  }
+
+   slist_node  free_slist;
+   std::size_t next_blocks_per_chunk;
+};
+
+//pool_resource
+
+//Detect overflow in ceil_pow2
+BOOST_STATIC_ASSERT(pool_options_default_max_blocks_per_chunk <= (std::size_t(-1)/2u+1u));
+//Sanity checks
+BOOST_STATIC_ASSERT(bi::detail::static_is_pow2<pool_options_default_max_blocks_per_chunk>::value);
+BOOST_STATIC_ASSERT(bi::detail::static_is_pow2<pool_options_minimum_largest_required_pool_block>::value);
+
+//unsynchronized_pool_resource
+
+void pool_resource::priv_limit_option(std::size_t &val, std::size_t min, std::size_t max) //static
+{
+   if(!val){
+      val = max;
+   }
+   else{
+      val = val < min ? min : boost::container::dtl::min_value(val, max);
+   }
+}
+
+std::size_t pool_resource::priv_pool_index(std::size_t block_size) //static
+{
+   //For allocations equal or less than pool_options_minimum_largest_required_pool_block
+   //the smallest pool is used
+   block_size = boost::container::dtl::max_value(block_size, pool_options_minimum_largest_required_pool_block);
+   return bi::detail::ceil_log2(block_size)
+      - bi::detail::ceil_log2(pool_options_minimum_largest_required_pool_block);
+}
+
+std::size_t pool_resource::priv_pool_block(std::size_t index)  //static
+{
+   //For allocations equal or less than pool_options_minimum_largest_required_pool_block
+   //the smallest pool is used
+   return pool_options_minimum_largest_required_pool_block << index;
+}
+
+void pool_resource::priv_fix_options()
+{
+   priv_limit_option(m_options.max_blocks_per_chunk
+                     , pool_options_minimum_max_blocks_per_chunk
+                     , pool_options_default_max_blocks_per_chunk);
+   priv_limit_option
+      ( m_options.largest_required_pool_block
+      , pool_options_minimum_largest_required_pool_block
+      , pool_options_default_largest_required_pool_block);
+   m_options.largest_required_pool_block = bi::detail::ceil_pow2(m_options.largest_required_pool_block);
+}
+
+void pool_resource::priv_init_pools()
+{
+   const std::size_t num_pools = priv_pool_index(m_options.largest_required_pool_block)+1u;
+   //Otherwise, just use the default alloc (zero pools)
+   void *p = 0;
+   //This can throw
+   p = m_upstream.allocate(sizeof(pool_data_t)*num_pools);
+   //This is nothrow
+   m_pool_data = static_cast<pool_data_t *>(p);
+   for(std::size_t i = 0, max = num_pools; i != max; ++i){
+      ::new(&m_pool_data[i], boost_container_new_t()) pool_data_t(pool_options_minimum_max_blocks_per_chunk);
+   }
+   m_pool_count = num_pools;
+}
+
+void pool_resource::priv_constructor_body()
+{
+   this->priv_fix_options();
+}
+
+pool_resource::pool_resource(const pool_options& opts, memory_resource* upstream) BOOST_NOEXCEPT
+   : m_options(opts), m_upstream(*upstream), m_oversized_list(), m_pool_data(), m_pool_count()
+{  this->priv_constructor_body();  }
+
+pool_resource::pool_resource() BOOST_NOEXCEPT
+   : m_options(), m_upstream(*get_default_resource()), m_oversized_list(), m_pool_data(), m_pool_count()
+{  this->priv_constructor_body();  }
+
+pool_resource::pool_resource(memory_resource* upstream) BOOST_NOEXCEPT
+   : m_options(), m_upstream(*upstream), m_oversized_list(), m_pool_data(), m_pool_count()
+{  this->priv_constructor_body();  }
+
+pool_resource::pool_resource(const pool_options& opts) BOOST_NOEXCEPT
+   : m_options(opts), m_upstream(*get_default_resource()), m_oversized_list(), m_pool_data(), m_pool_count()
+{  this->priv_constructor_body();  }
+
+pool_resource::~pool_resource()
+{
+   this->release();
+
+   for(std::size_t i = 0, max = m_pool_count; i != max; ++i){
+      m_pool_data[i].~pool_data_t();
+   }
+   if(m_pool_data){
+      m_upstream.deallocate((void*)m_pool_data, sizeof(pool_data_t)*m_pool_count);
+   }
+}
+
+void pool_resource::release()
+{
+   m_oversized_list.release(m_upstream);
+   for(std::size_t i = 0, max = m_pool_count; i != max; ++i)
+   {
+      m_pool_data[i].release(m_upstream);
+   }
+}
+
+memory_resource* pool_resource::upstream_resource() const
+{  return &m_upstream;  }
+
+pool_options pool_resource::options() const
+{  return m_options; }
+
+void* pool_resource::do_allocate(std::size_t bytes, std::size_t alignment)
+{
+   if(!m_pool_data){
+      this->priv_init_pools();
+   }
+   (void)alignment;  //alignment ignored here, max_align is used by pools
+   if(bytes > m_options.largest_required_pool_block){
+      return m_oversized_list.allocate(bytes, m_upstream);
+   }
+   else{
+      const std::size_t pool_idx = priv_pool_index(bytes);
+      pool_data_t & pool = m_pool_data[pool_idx];
+      void *p = pool.allocate_block();
+      if(!p){
+         pool.replenish(m_upstream, priv_pool_block(pool_idx), m_options.max_blocks_per_chunk);
+         p = pool.allocate_block();
+      }
+      return p;
+   }
+}
+
+void pool_resource::do_deallocate(void* p, std::size_t bytes, std::size_t alignment)
+{
+   (void)alignment;  //alignment ignored here, max_align is used by pools
+   if(bytes > m_options.largest_required_pool_block){
+      //Just cached
+      return m_oversized_list.deallocate(p, m_upstream);
+   }
+   else{
+      const std::size_t pool_idx = priv_pool_index(bytes);
+      return m_pool_data[pool_idx].deallocate_block(p);
+   }
+}
+
+std::size_t pool_resource::pool_count() const
+{
+   if(BOOST_LIKELY((0 != m_pool_data))){
+      return m_pool_count;
+   }
+   else{
+      return priv_pool_index(m_options.largest_required_pool_block)+1u;
+   }
+}
+
+std::size_t pool_resource::pool_index(std::size_t bytes) const
+{
+   if(bytes > m_options.largest_required_pool_block){
+      return pool_count();
+   }
+   else{
+      return priv_pool_index(bytes);
+   }
+}
+
+std::size_t pool_resource::pool_next_blocks_per_chunk(std::size_t pool_idx) const
+{
+   if(BOOST_LIKELY((m_pool_data && pool_idx < m_pool_count))){
+      return m_pool_data[pool_idx].next_blocks_per_chunk;
+   }
+   else{
+      return 1u;
+   }
+}
+
+std::size_t pool_resource::pool_block(std::size_t pool_idx) const
+{  return priv_pool_block(pool_idx);  }
+
+std::size_t pool_resource::pool_cached_blocks(std::size_t pool_idx) const
+{
+   if(BOOST_LIKELY((m_pool_data && pool_idx < m_pool_count))){
+      return m_pool_data[pool_idx].cache_count();
+   }
+   else{
+      return 0u;
+   }
+}
+
+}  //namespace pmr {
+}  //namespace container {
+}  //namespace boost {
+
+#include <boost/container/detail/config_end.hpp>

sources/boost-source/container/synchronized_pool_resource.cpp

@@ -0,0 +1,111 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2015-2015. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#define BOOST_CONTAINER_SOURCE
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+#include <boost/container/detail/thread_mutex.hpp>
+
+#include <boost/container/pmr/synchronized_pool_resource.hpp>
+#include <cstddef>
+
+namespace {
+
+using namespace boost::container::dtl;
+
+class thread_mutex_lock
+{
+   thread_mutex &m_mut;
+
+   public:
+   explicit thread_mutex_lock(thread_mutex &m)
+      : m_mut(m)
+   {
+      m_mut.lock();
+   }
+
+   ~thread_mutex_lock()
+   {
+      m_mut.unlock();
+   }
+};
+
+}  //namespace {
+
+namespace boost {
+namespace container {
+namespace pmr {
+
+synchronized_pool_resource::synchronized_pool_resource(const pool_options& opts, memory_resource* upstream) BOOST_NOEXCEPT
+   : m_mut(), m_pool_resource(opts, upstream)
+{}
+
+synchronized_pool_resource::synchronized_pool_resource() BOOST_NOEXCEPT
+   : m_mut(), m_pool_resource()
+{}
+
+synchronized_pool_resource::synchronized_pool_resource(memory_resource* upstream) BOOST_NOEXCEPT
+   : m_mut(), m_pool_resource(upstream)
+{}
+
+synchronized_pool_resource::synchronized_pool_resource(const pool_options& opts) BOOST_NOEXCEPT
+   : m_mut(), m_pool_resource(opts)
+{}
+
+synchronized_pool_resource::~synchronized_pool_resource() //virtual
+{}
+
+void synchronized_pool_resource::release()
+{
+   thread_mutex_lock lck(m_mut); (void)lck;
+   m_pool_resource.release();
+}
+
+memory_resource* synchronized_pool_resource::upstream_resource() const
+{  return m_pool_resource.upstream_resource();  }
+
+pool_options synchronized_pool_resource::options() const
+{  return m_pool_resource.options();  }
+
+void* synchronized_pool_resource::do_allocate(std::size_t bytes, std::size_t alignment) //virtual
+{
+   thread_mutex_lock lck(m_mut); (void)lck;
+   return m_pool_resource.do_allocate(bytes, alignment);
+}
+
+void synchronized_pool_resource::do_deallocate(void* p, std::size_t bytes, std::size_t alignment) //virtual
+{
+   thread_mutex_lock lck(m_mut); (void)lck;
+   return m_pool_resource.do_deallocate(p, bytes, alignment);
+}
+
+bool synchronized_pool_resource::do_is_equal(const memory_resource& other) const BOOST_NOEXCEPT //virtual
+{  return this == &other;  }
+
+std::size_t synchronized_pool_resource::pool_count() const
+{  return m_pool_resource.pool_count();  }
+
+std::size_t synchronized_pool_resource::pool_index(std::size_t bytes) const
+{  return m_pool_resource.pool_index(bytes);  }
+
+std::size_t synchronized_pool_resource::pool_next_blocks_per_chunk(std::size_t pool_idx) const
+{  return m_pool_resource.pool_next_blocks_per_chunk(pool_idx);  }
+
+std::size_t synchronized_pool_resource::pool_block(std::size_t pool_idx) const
+{  return m_pool_resource.pool_block(pool_idx);  }
+
+std::size_t synchronized_pool_resource::pool_cached_blocks(std::size_t pool_idx) const
+{  return m_pool_resource.pool_cached_blocks(pool_idx);  }
+
+}  //namespace pmr {
+}  //namespace container {
+}  //namespace boost {
+
+#include <boost/container/detail/config_end.hpp>

sources/boost-source/container/unsynchronized_pool_resource.cpp

@@ -0,0 +1,79 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2015-2015. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#define BOOST_CONTAINER_SOURCE
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+
+#include <boost/container/pmr/unsynchronized_pool_resource.hpp>
+
+namespace boost {
+namespace container {
+namespace pmr {
+
+unsynchronized_pool_resource::unsynchronized_pool_resource(const pool_options& opts, memory_resource* upstream) BOOST_NOEXCEPT
+   : m_resource(opts, upstream)
+{}
+
+unsynchronized_pool_resource::unsynchronized_pool_resource() BOOST_NOEXCEPT
+   : m_resource()
+{}
+
+unsynchronized_pool_resource::unsynchronized_pool_resource(memory_resource* upstream) BOOST_NOEXCEPT
+   : m_resource(upstream)
+{}
+
+unsynchronized_pool_resource::unsynchronized_pool_resource(const pool_options& opts) BOOST_NOEXCEPT
+   : m_resource(opts)
+{}
+
+unsynchronized_pool_resource::~unsynchronized_pool_resource() //virtual
+{}
+
+void unsynchronized_pool_resource::release()
+{
+   m_resource.release();
+}
+
+memory_resource* unsynchronized_pool_resource::upstream_resource() const
+{  return m_resource.upstream_resource();  }
+
+pool_options unsynchronized_pool_resource::options() const
+{  return m_resource.options();  }
+
+void* unsynchronized_pool_resource::do_allocate(std::size_t bytes, std::size_t alignment) //virtual
+{  return m_resource.do_allocate(bytes, alignment);  }
+
+void unsynchronized_pool_resource::do_deallocate(void* p, std::size_t bytes, std::size_t alignment) //virtual
+{  return m_resource.do_deallocate(p, bytes, alignment);  }
+
+bool unsynchronized_pool_resource::do_is_equal(const memory_resource& other) const BOOST_NOEXCEPT //virtual
+{  return this == &other;  }
+
+std::size_t unsynchronized_pool_resource::pool_count() const
+{  return m_resource.pool_count();  }
+
+std::size_t unsynchronized_pool_resource::pool_index(std::size_t bytes) const
+{  return m_resource.pool_index(bytes);  }
+
+std::size_t unsynchronized_pool_resource::pool_next_blocks_per_chunk(std::size_t pool_idx) const
+{  return m_resource.pool_next_blocks_per_chunk(pool_idx);  }
+
+std::size_t unsynchronized_pool_resource::pool_block(std::size_t pool_idx) const
+{  return m_resource.pool_block(pool_idx);  }
+
+std::size_t unsynchronized_pool_resource::pool_cached_blocks(std::size_t pool_idx) const
+{  return m_resource.pool_cached_blocks(pool_idx);  }
+
+}  //namespace pmr {
+}  //namespace container {
+}  //namespace boost {
+
+#include <boost/container/detail/config_end.hpp>

sources/boost/accumulators/statistics/p_square_cumulative_distribution.hpp

@@ -8,9 +8,9 @@
 #ifndef BOOST_ACCUMULATORS_STATISTICS_P_SQUARE_CUMULATIVE_DISTRIBUTION_HPP_03_19_2012
 #define BOOST_ACCUMULATORS_STATISTICS_P_SQUARE_CUMULATIVE_DISTRIBUTION_HPP_03_19_2012
 
-#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__DMC__)
+#if defined(_MSC_VER) || defined(__BORLANDC__) && !defined(__clang__) || defined(__DMC__)
 #  pragma message ("Warning: This header is deprecated. Please use: boost/accumulators/statistics/p_square_cumul_dist.hpp")
-#elif defined(__GNUC__) || defined(__HP_aCC) || defined(__SUNPRO_CC) || defined(__IBMCPP__)
+#elif defined(__GNUC__) || defined(__HP_aCC) || defined(__SUNPRO_CC) || defined(__IBMCPP__) || defined(__BORLANDC__)
 #  warning "This header is deprecated. Please use: boost/accumulators/statistics/p_square_cumul_dist.hpp"
 #endif
 

sources/boost/accumulators/statistics/weighted_p_square_cumulative_distribution.hpp

@@ -8,9 +8,9 @@
 #ifndef BOOST_ACCUMULATORS_STATISTICS_WEIGHTED_P_SQUARE_CUMULATIVE_DISTRIBUTION_HPP_03_19_2012
 #define BOOST_ACCUMULATORS_STATISTICS_WEIGHTED_P_SQUARE_CUMULATIVE_DISTRIBUTION_HPP_03_19_2012
 
-#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__DMC__)
+#if defined(_MSC_VER) || defined(__BORLANDC__) && !defined(__clang__) || defined(__DMC__)
 #  pragma message ("Warning: This header is deprecated. Please use: boost/accumulators/statistics/weighted_p_square_cumul_dist.hpp")
-#elif defined(__GNUC__) || defined(__HP_aCC) || defined(__SUNPRO_CC) || defined(__IBMCPP__)
+#elif defined(__GNUC__) || defined(__HP_aCC) || defined(__SUNPRO_CC) || defined(__IBMCPP__) || defined(__BORLANDC__)
 #  warning "This header is deprecated. Please use: boost/accumulators/statistics/weighted_p_square_cumul_dist.hpp"
 #endif
 

sources/boost/algorithm/apply_permutation.hpp

@@ -19,7 +19,6 @@
 #define BOOST_ALGORITHM_APPLY_PERMUTATION_HPP
 
 #include <algorithm>
-#include <type_traits>
 
 #include <boost/config.hpp>
 #include <boost/range/begin.hpp>

sources/boost/algorithm/cxx17/inclusive_scan.hpp

@@ -9,8 +9,8 @@
 /// \brief Combine the (transformed) elements of a sequence (or two) into a single value.
 /// \author Marshall Clow
 
-#ifndef BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
+#ifndef BOOST_ALGORITHM_INCLUSIVE_SCAN_HPP
-#define BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
+#define BOOST_ALGORITHM_INCLUSIVE_SCAN_HPP
 
 #include <functional>     // for std::plus
 #include <iterator>       // for std::iterator_traits
@@ -58,4 +58,4 @@ OutputIterator inclusive_scan(InputIterator first, InputIterator last,
 
 }} // namespace boost and algorithm
 
-#endif // BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
+#endif // BOOST_ALGORITHM_INCLUSIVE_SCAN_HPP

sources/boost/algorithm/string/detail/case_conv.hpp

@@ -15,6 +15,9 @@
 #include <locale>
 #include <functional>
 
+#include <boost/iterator/transform_iterator.hpp>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
 #include <boost/type_traits/make_unsigned.hpp>
 
 namespace boost {

sources/boost/algorithm/string/detail/classification.hpp

@@ -13,10 +13,12 @@
 
 #include <boost/algorithm/string/config.hpp>
 #include <algorithm>
+#include <cstring>
 #include <functional>
 #include <locale>
 
 #include <boost/range/begin.hpp>
+#include <boost/range/distance.hpp>
 #include <boost/range/end.hpp>
 
 #include <boost/algorithm/string/predicate_facade.hpp>

sources/boost/algorithm/string/detail/find_format_all.hpp

@@ -18,6 +18,8 @@
 #include <boost/algorithm/string/detail/find_format_store.hpp>
 #include <boost/algorithm/string/detail/replace_storage.hpp>
 
+#include <deque>
+
 namespace boost {
     namespace algorithm {
         namespace detail {

sources/boost/align/align.hpp

@@ -10,7 +10,7 @@ Distributed under the Boost Software License, Version 1.0.
 
 #include <boost/config.hpp>
 
-#if !defined(BOOST_NO_CXX11_STD_ALIGN)
+#if !defined(BOOST_NO_CXX11_STD_ALIGN) && !defined(BOOST_LIBSTDCXX_VERSION)
 #include <boost/align/detail/align_cxx11.hpp>
 #else
 #include <boost/align/detail/align.hpp>

sources/boost/align/detail/align.hpp

@@ -1,5 +1,5 @@
 /*
-Copyright 2014-2016 Glen Joseph Fernandes
+Copyright 2014-2020 Glen Joseph Fernandes
 (glenjofe@gmail.com)
 
 Distributed under the Boost Software License, Version 1.0.
@@ -19,13 +19,15 @@ align(std::size_t alignment, std::size_t size, void*& ptr,
     std::size_t& space)
 {
     BOOST_ASSERT(boost::alignment::detail::is_alignment(alignment));
-    char* p = reinterpret_cast<char*>(~(alignment - 1) &
+    if (size <= space) {
-        (reinterpret_cast<std::size_t>(ptr) + alignment - 1));
+        char* p = reinterpret_cast<char*>(~(alignment - 1) &
-    std::size_t n = p - static_cast<char*>(ptr);
+            (reinterpret_cast<std::size_t>(ptr) + alignment - 1));
-    if (size + n <= space) {
+        std::size_t n = p - static_cast<char*>(ptr);
-        ptr = p;
+        if (n <= space - size) {
-        space -= n;
+            ptr = p;
-        return p;
+            space -= n;
+            return p;
+        }
     }
     return 0;
 }

sources/boost/any.hpp

@@ -3,18 +3,20 @@
 #ifndef BOOST_ANY_INCLUDED
 #define BOOST_ANY_INCLUDED
 
-#if defined(_MSC_VER)
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
 # pragma once
 #endif
 
 // what:  variant type boost::any
 // who:   contributed by Kevlin Henney,
 //        with features contributed and bugs found by
-//        Antony Polukhin, Ed Brey, Mark Rodgers, 
+//        Antony Polukhin, Ed Brey, Mark Rodgers,
 //        Peter Dimov, and James Curran
 // when:  July 2001, April 2013 - 2020
 
-#include <boost/config.hpp>
+#include <boost/any/bad_any_cast.hpp>
+#include <boost/any/fwd.hpp>
 #include <boost/type_index.hpp>
 #include <boost/type_traits/remove_reference.hpp>
 #include <boost/type_traits/decay.hpp>
@@ -27,7 +29,6 @@
 #include <boost/utility/enable_if.hpp>
 #include <boost/core/addressof.hpp>
 #include <boost/type_traits/is_same.hpp>
-#include <boost/type_traits/is_const.hpp>
 #include <boost/type_traits/conditional.hpp>
 
 namespace boost
@@ -47,6 +48,10 @@ namespace boost
                 BOOST_DEDUCED_TYPENAME remove_cv<BOOST_DEDUCED_TYPENAME decay<const ValueType>::type>::type
             >(value))
         {
+            BOOST_STATIC_ASSERT_MSG(
+                !anys::detail::is_basic_any<ValueType>::value,
+                "boost::any shall not be constructed from boost::anys::basic_any"
+            );
         }
 
         any(const any & other)
@@ -69,6 +74,10 @@ namespace boost
             , typename boost::disable_if<boost::is_const<ValueType> >::type* = 0) // disable if value has type `const ValueType&&`
           : content(new holder< typename decay<ValueType>::type >(static_cast<ValueType&&>(value)))
         {
+            BOOST_STATIC_ASSERT_MSG(
+                !anys::detail::is_basic_any<typename boost::decay<ValueType>::type>::value,
+                "boost::any shall not be constructed from boost::anys::basic_any"
+            );
         }
 #endif
 
@@ -92,6 +101,10 @@ namespace boost
         template<typename ValueType>
         any & operator=(const ValueType & rhs)
         {
+            BOOST_STATIC_ASSERT_MSG(
+                !anys::detail::is_basic_any<ValueType>::value,
+                "boost::anys::basic_any shall not be assigned into boost::any"
+            );
             any(rhs).swap(*this);
             return *this;
         }
@@ -102,7 +115,7 @@ namespace boost
             return *this;
         }
 
-#else 
+#else
         any & operator=(const any& rhs)
         {
             any(rhs).swap(*this);
@@ -121,6 +134,10 @@ namespace boost
         template <class ValueType>
         any & operator=(ValueType&& rhs)
         {
+            BOOST_STATIC_ASSERT_MSG(
+                !anys::detail::is_basic_any<typename boost::decay<ValueType>::type>::value,
+                "boost::anys::basic_any shall not be assigned into boost::any"
+            );
             any(static_cast<ValueType&&>(rhs)).swap(*this);
             return *this;
         }
@@ -224,27 +241,12 @@ namespace boost
         placeholder * content;
 
     };
- 
+
     inline void swap(any & lhs, any & rhs) BOOST_NOEXCEPT
     {
         lhs.swap(rhs);
     }
 
-    class BOOST_SYMBOL_VISIBLE bad_any_cast :
-#ifndef BOOST_NO_RTTI
-        public std::bad_cast
-#else
-        public std::exception
-#endif
-    {
-    public:
-        const char * what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE
-        {
-            return "boost::bad_any_cast: "
-                   "failed conversion using boost::any_cast";
-        }
-    };
-
     template<typename ValueType>
     ValueType * any_cast(any * operand) BOOST_NOEXCEPT
     {
@@ -271,9 +273,9 @@ namespace boost
         if(!result)
             boost::throw_exception(bad_any_cast());
 
-        // Attempt to avoid construction of a temporary object in cases when 
+        // Attempt to avoid construction of a temporary object in cases when
         // `ValueType` is not a reference. Example:
-        // `static_cast<std::string>(*result);` 
+        // `static_cast<std::string>(*result);`
         // which is equal to `std::string(*result);`
         typedef BOOST_DEDUCED_TYPENAME boost::conditional<
             boost::is_reference<ValueType>::value,
@@ -305,7 +307,7 @@ namespace boost
         BOOST_STATIC_ASSERT_MSG(
             boost::is_rvalue_reference<ValueType&&>::value /*true if ValueType is rvalue or just a value*/
             || boost::is_const< typename boost::remove_reference<ValueType>::type >::value,
-            "boost::any_cast shall not be used for getting nonconst references to temporary objects" 
+            "boost::any_cast shall not be used for getting nonconst references to temporary objects"
         );
         return any_cast<ValueType>(operand);
     }
@@ -333,7 +335,7 @@ namespace boost
 }
 
 // Copyright Kevlin Henney, 2000, 2001, 2002. All rights reserved.
-// Copyright Antony Polukhin, 2013-2020.
+// Copyright Antony Polukhin, 2013-2021.
 //
 // Distributed under the Boost Software License, Version 1.0. (See
 // accompanying file LICENSE_1_0.txt or copy at

sources/boost/any/bad_any_cast.hpp

@@ -0,0 +1,43 @@
+// Copyright Antony Polukhin, 2020-2021.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org/libs/any for Documentation.
+
+#ifndef BOOST_ANYS_BAD_ANY_CAST_HPP_INCLUDED
+#define BOOST_ANYS_BAD_ANY_CAST_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#ifndef BOOST_NO_RTTI
+#include <typeinfo>
+#endif
+
+#include <stdexcept>
+
+namespace boost {
+
+class BOOST_SYMBOL_VISIBLE bad_any_cast :
+#ifndef BOOST_NO_RTTI
+    public std::bad_cast
+#else
+    public std::exception
+#endif
+{
+public:
+    const char * what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE
+    {
+        return "boost::bad_any_cast: "
+               "failed conversion using boost::any_cast";
+    }
+};
+
+} // namespace boost
+
+
+#endif // #ifndef BOOST_ANYS_BAD_ANY_CAST_HPP_INCLUDED

sources/boost/any/basic_any.hpp

@@ -0,0 +1,480 @@
+// Copyright Ruslan Arutyunyan, 2019-2021.
+// Copyright Antony Polukhin, 2021.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// Contributed by Ruslan Arutyunyan
+
+#ifndef BOOST_ANYS_BASIC_ANY_HPP_INCLUDED
+#define BOOST_ANYS_BASIC_ANY_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <boost/any/bad_any_cast.hpp>
+#include <boost/any/fwd.hpp>
+#include <boost/assert.hpp>
+#include <boost/aligned_storage.hpp>
+#include <boost/type_index.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/type_traits/decay.hpp>
+#include <boost/type_traits/remove_cv.hpp>
+#include <boost/type_traits/add_reference.hpp>
+#include <boost/type_traits/is_reference.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/is_nothrow_move_constructible.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/core/addressof.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/conditional.hpp>
+
+namespace boost {
+
+namespace anys {
+
+    template <std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
+    class basic_any
+    {
+        BOOST_STATIC_ASSERT_MSG(OptimizeForSize > 0 && OptimizeForAlignment > 0, "Size and Align shall be positive values");
+        BOOST_STATIC_ASSERT_MSG(OptimizeForSize >= OptimizeForAlignment, "Size shall non less than Align");
+        BOOST_STATIC_ASSERT_MSG((OptimizeForAlignment & (OptimizeForAlignment - 1)) == 0, "Align shall be a power of 2");
+        BOOST_STATIC_ASSERT_MSG(OptimizeForSize % OptimizeForAlignment == 0, "Size shall be multiple of alignment");
+    private:
+        enum operation
+        {
+            Destroy,
+            Move,
+            Copy,
+            AnyCast,
+            UnsafeCast,
+            Typeinfo
+        };
+
+        template <typename ValueType>
+        static void* small_manager(operation op, basic_any& left, const basic_any* right, const boost::typeindex::type_info* info)
+        {
+            switch (op)
+            {
+                case Destroy:
+                    BOOST_ASSERT(!left.empty());
+                    reinterpret_cast<ValueType*>(&left.content.small_value)->~ValueType();
+                    break;
+                case Move: {
+                    BOOST_ASSERT(left.empty());
+                    BOOST_ASSERT(right);
+                    BOOST_ASSERT(!right->empty());
+                    BOOST_ASSERT(right->type() == boost::typeindex::type_id<ValueType>());
+                    ValueType* value = reinterpret_cast<ValueType*>(&const_cast<basic_any*>(right)->content.small_value);
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+                    new (&left.content.small_value) ValueType(std::move(*value));
+#else
+                    new (&left.content.small_value) ValueType(*value);
+#endif
+                    left.man = right->man;
+                    reinterpret_cast<ValueType const*>(&right->content.small_value)->~ValueType();
+                    const_cast<basic_any*>(right)->man = 0;
+
+                    };
+                    break;
+
+                case Copy:
+                    BOOST_ASSERT(left.empty());
+                    BOOST_ASSERT(right);
+                    BOOST_ASSERT(!right->empty());
+                    BOOST_ASSERT(right->type() == boost::typeindex::type_id<ValueType>());
+                    new (&left.content.small_value) ValueType(*reinterpret_cast<const ValueType*>(&right->content.small_value));
+                    left.man = right->man;
+                    break;
+                case AnyCast:
+                    BOOST_ASSERT(info);
+                    BOOST_ASSERT(!left.empty());
+                    return boost::typeindex::type_id<ValueType>() == *info ?
+                            reinterpret_cast<typename remove_cv<ValueType>::type *>(&left.content.small_value) : 0;
+                case UnsafeCast:
+                    BOOST_ASSERT(!left.empty());
+                    return reinterpret_cast<typename remove_cv<ValueType>::type *>(&left.content.small_value);
+                case Typeinfo:
+                    return const_cast<void*>(static_cast<const void*>(&boost::typeindex::type_id<ValueType>().type_info()));
+            }
+
+            return 0;
+        }
+
+        template <typename ValueType>
+        static void* large_manager(operation op, basic_any& left, const basic_any* right, const boost::typeindex::type_info* info)
+        {
+            switch (op)
+            {
+                case Destroy:
+                    BOOST_ASSERT(!left.empty());
+                    delete static_cast<ValueType*>(left.content.large_value);
+                    break;
+                case Move:
+                    BOOST_ASSERT(left.empty());
+                    BOOST_ASSERT(right);
+                    BOOST_ASSERT(!right->empty());
+                    BOOST_ASSERT(right->type() == boost::typeindex::type_id<ValueType>());
+                    left.content.large_value = right->content.large_value;
+                    left.man = right->man;
+                    const_cast<basic_any*>(right)->content.large_value = 0;
+                    const_cast<basic_any*>(right)->man = 0;
+                    break;
+                case Copy:
+                    BOOST_ASSERT(left.empty());
+                    BOOST_ASSERT(right);
+                    BOOST_ASSERT(!right->empty());
+                    BOOST_ASSERT(right->type() == boost::typeindex::type_id<ValueType>());
+                    left.content.large_value = new ValueType(*static_cast<const ValueType*>(right->content.large_value));
+                    left.man = right->man;
+                    break;
+                case AnyCast:
+                    BOOST_ASSERT(info);
+                    BOOST_ASSERT(!left.empty());
+                    return boost::typeindex::type_id<ValueType>() == *info ?
+                            static_cast<typename remove_cv<ValueType>::type *>(left.content.large_value) : 0;
+                case UnsafeCast:
+                    BOOST_ASSERT(!left.empty());
+                    return reinterpret_cast<typename remove_cv<ValueType>::type *>(left.content.large_value);
+                case Typeinfo:
+                    return const_cast<void*>(static_cast<const void*>(&boost::typeindex::type_id<ValueType>().type_info()));
+            }
+
+            return 0;
+        }
+
+        template <typename ValueType>
+        struct is_small_object : boost::integral_constant<bool, sizeof(ValueType) <= OptimizeForSize &&
+            boost::alignment_of<ValueType>::value <= OptimizeForAlignment &&
+            boost::is_nothrow_move_constructible<ValueType>::value>
+        {};
+
+        template <typename ValueType>
+        static void create(basic_any& any, const ValueType& value, boost::true_type)
+        {
+            typedef typename boost::decay<const ValueType>::type DecayedType;
+
+            any.man = &small_manager<DecayedType>;
+            new (&any.content.small_value) ValueType(value);
+        }
+
+        template <typename ValueType>
+        static void create(basic_any& any, const ValueType& value, boost::false_type)
+        {
+            typedef typename boost::decay<const ValueType>::type DecayedType;
+
+            any.man = &large_manager<DecayedType>;
+            any.content.large_value = new DecayedType(value);
+        }
+
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+        template <typename ValueType>
+        static void create(basic_any& any, ValueType&& value, boost::true_type)
+        {
+            typedef typename boost::decay<const ValueType>::type DecayedType;
+            any.man = &small_manager<DecayedType>;
+            new (&any.content.small_value) DecayedType(static_cast<ValueType&&>(value));
+        }
+
+        template <typename ValueType>
+        static void create(basic_any& any, ValueType&& value, boost::false_type)
+        {
+            typedef typename boost::decay<const ValueType>::type DecayedType;
+            any.man = &large_manager<DecayedType>;
+            any.content.large_value = new DecayedType(static_cast<ValueType&&>(value));
+        }
+#endif
+    public: // non-type template parameters accessors
+            static BOOST_CONSTEXPR_OR_CONST std::size_t buffer_size = OptimizeForSize;
+            static BOOST_CONSTEXPR_OR_CONST std::size_t buffer_align = OptimizeForAlignment;
+
+    public: // structors
+
+        BOOST_CONSTEXPR basic_any() BOOST_NOEXCEPT
+            : man(0), content()
+        {
+        }
+
+        template<typename ValueType>
+        basic_any(const ValueType & value)
+            : man(0), content()
+        {
+            BOOST_STATIC_ASSERT_MSG(
+                !(boost::is_same<ValueType, boost::any>::value),
+                "boost::anys::basic_any shall not be constructed from boost::any"
+            );
+            BOOST_STATIC_ASSERT_MSG(
+                !anys::detail::is_basic_any<ValueType>::value,
+                "boost::anys::basic_any<A, B> shall not be constructed from boost::anys::basic_any<C, D>"
+            );
+            create(*this, value, is_small_object<ValueType>());
+        }
+
+        basic_any(const basic_any & other)
+          : man(0), content()
+        {
+            if (other.man)
+            {
+                other.man(Copy, *this, &other, 0);
+            }
+        }
+
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+        // Move constructor
+        basic_any(basic_any&& other) BOOST_NOEXCEPT
+          : man(0), content()
+        {
+            if (other.man)
+            {
+                other.man(Move, *this, &other, 0);
+            }
+        }
+
+        // Perfect forwarding of ValueType
+        template<typename ValueType>
+        basic_any(ValueType&& value
+            , typename boost::disable_if<boost::is_same<basic_any&, ValueType> >::type* = 0 // disable if value has type `basic_any&`
+            , typename boost::disable_if<boost::is_const<ValueType> >::type* = 0) // disable if value has type `const ValueType&&`
+          : man(0), content()
+        {
+            typedef typename boost::decay<ValueType>::type DecayedType;
+            BOOST_STATIC_ASSERT_MSG(
+                !(boost::is_same<DecayedType, boost::any>::value),
+                "boost::anys::basic_any shall not be constructed from boost::any"
+            );
+            BOOST_STATIC_ASSERT_MSG(
+                !anys::detail::is_basic_any<DecayedType>::value,
+                "boost::anys::basic_any<A, B> shall not be constructed from boost::anys::basic_any<C, D>"
+            );
+            create(*this, static_cast<ValueType&&>(value), is_small_object<DecayedType>());
+        }
+#endif
+
+        ~basic_any() BOOST_NOEXCEPT
+        {
+            if (man)
+            {
+                man(Destroy, *this, 0, 0);
+            }
+        }
+
+    public: // modifiers
+
+        basic_any & swap(basic_any & rhs) BOOST_NOEXCEPT
+        {
+            if (this == &rhs)
+            {
+                return *this;
+            }
+
+            if (man && rhs.man)
+            {
+                basic_any tmp;
+                rhs.man(Move, tmp, &rhs, 0);
+                man(Move, rhs, this, 0);
+                tmp.man(Move, *this, &tmp, 0);
+            }
+            else if (man)
+            {
+                man(Move, rhs, this, 0);
+            }
+            else if (rhs.man)
+            {
+                rhs.man(Move, *this, &rhs, 0);
+            }
+            return *this;
+        }
+
+
+#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
+        template<typename ValueType>
+        basic_any & operator=(const ValueType & rhs)
+        {
+            BOOST_STATIC_ASSERT_MSG(
+                !(boost::is_same<ValueType, boost::any>::value),
+                "boost::any shall not be assigned into boost::anys::basic_any"
+            );
+            BOOST_STATIC_ASSERT_MSG(
+                !anys::detail::is_basic_any<ValueType>::value,
+                "boost::anys::basic_any<A, B> shall not be assigned into boost::anys::basic_any<C, D>"
+            );
+            basic_any(rhs).swap(*this);
+            return *this;
+        }
+
+        basic_any & operator=(basic_any rhs)
+        {
+            rhs.swap(*this);
+            return *this;
+        }
+
+#else
+        basic_any & operator=(const basic_any& rhs)
+        {
+            basic_any(rhs).swap(*this);
+            return *this;
+        }
+
+        // move assignment
+        basic_any & operator=(basic_any&& rhs) BOOST_NOEXCEPT
+        {
+            rhs.swap(*this);
+            basic_any().swap(rhs);
+            return *this;
+        }
+
+        // Perfect forwarding of ValueType
+        template <class ValueType>
+        basic_any & operator=(ValueType&& rhs)
+        {
+            typedef typename boost::decay<ValueType>::type DecayedType;
+            BOOST_STATIC_ASSERT_MSG(
+                !(boost::is_same<DecayedType, boost::any>::value),
+                "boost::any shall not be assigned into boost::anys::basic_any"
+            );
+            BOOST_STATIC_ASSERT_MSG(
+                (!anys::detail::is_basic_any<DecayedType>::value || boost::is_same<DecayedType, basic_any>::value),
+                "boost::anys::basic_any<A, B> shall not be assigned into boost::anys::basic_any<C, D>"
+            );
+            basic_any(static_cast<ValueType&&>(rhs)).swap(*this);
+            return *this;
+        }
+#endif
+
+    public: // queries
+
+        bool empty() const BOOST_NOEXCEPT
+        {
+            return !man;
+        }
+
+        void clear() BOOST_NOEXCEPT
+        {
+            basic_any().swap(*this);
+        }
+
+        const boost::typeindex::type_info& type() const BOOST_NOEXCEPT
+        {
+            return man
+                    ? *static_cast<const boost::typeindex::type_info*>(man(Typeinfo, const_cast<basic_any&>(*this), 0, 0))
+                    : boost::typeindex::type_id<void>().type_info();
+        }
+
+    private: // representation
+
+        template<typename ValueType, std::size_t Size, std::size_t Alignment>
+        friend ValueType * any_cast(basic_any<Size, Alignment> *) BOOST_NOEXCEPT;
+
+        template<typename ValueType, std::size_t Size, std::size_t Alignment>
+        friend ValueType * unsafe_any_cast(basic_any<Size, Alignment> *) BOOST_NOEXCEPT;
+
+        typedef void*(*manager)(operation op, basic_any& left, const basic_any* right, const boost::typeindex::type_info* info);
+
+        manager man;
+
+        union content {
+            void * large_value;
+            typename boost::aligned_storage<OptimizeForSize, OptimizeForAlignment>::type small_value;
+        } content;
+    };
+
+    template<std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
+    void swap(basic_any<OptimizeForSize, OptimizeForAlignment>& lhs, basic_any<OptimizeForSize, OptimizeForAlignment>& rhs) BOOST_NOEXCEPT
+    {
+        lhs.swap(rhs);
+    }
+
+    template<typename ValueType, std::size_t Size, std::size_t Alignment>
+    ValueType * any_cast(basic_any<Size, Alignment> * operand) BOOST_NOEXCEPT
+    {
+        return operand->man ?
+                static_cast<typename remove_cv<ValueType>::type *>(operand->man(basic_any<Size, Alignment>::AnyCast, *operand, 0, &boost::typeindex::type_id<ValueType>().type_info()))
+                : 0;
+    }
+
+    template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
+    inline const ValueType * any_cast(const basic_any<OptimizeForSize, OptimizeForAlignment> * operand) BOOST_NOEXCEPT
+    {
+        return any_cast<ValueType>(const_cast<basic_any<OptimizeForSize, OptimizeForAlignment> *>(operand));
+    }
+
+    template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
+    ValueType any_cast(basic_any<OptimizeForSize, OptimizeForAlignment> & operand)
+    {
+        typedef typename remove_reference<ValueType>::type nonref;
+
+        nonref * result = any_cast<nonref>(boost::addressof(operand));
+        if(!result)
+            boost::throw_exception(bad_any_cast());
+
+        // Attempt to avoid construction of a temporary object in cases when
+        // `ValueType` is not a reference. Example:
+        // `static_cast<std::string>(*result);`
+        // which is equal to `std::string(*result);`
+        typedef typename boost::conditional<
+            boost::is_reference<ValueType>::value,
+            ValueType,
+            typename boost::add_reference<ValueType>::type
+        >::type ref_type;
+
+#ifdef BOOST_MSVC
+#   pragma warning(push)
+#   pragma warning(disable: 4172) // "returning address of local variable or temporary" but *result is not local!
+#endif
+        return static_cast<ref_type>(*result);
+#ifdef BOOST_MSVC
+#   pragma warning(pop)
+#endif
+    }
+
+    template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
+    inline ValueType any_cast(const basic_any<OptimizeForSize, OptimizeForAlignment> & operand)
+    {
+        typedef typename remove_reference<ValueType>::type nonref;
+        return any_cast<const nonref &>(const_cast<basic_any<OptimizeForSize, OptimizeForAlignment> &>(operand));
+    }
+
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+    template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
+    inline ValueType any_cast(basic_any<OptimizeForSize, OptimizeForAlignment>&& operand)
+    {
+        BOOST_STATIC_ASSERT_MSG(
+            boost::is_rvalue_reference<ValueType&&>::value /*true if ValueType is rvalue or just a value*/
+            || boost::is_const< typename boost::remove_reference<ValueType>::type >::value,
+            "boost::any_cast shall not be used for getting nonconst references to temporary objects"
+        );
+        return any_cast<ValueType>(operand);
+    }
+#endif
+
+
+    // Note: The "unsafe" versions of any_cast are not part of the
+    // public interface and may be removed at any time. They are
+    // required where we know what type is stored in the any and can't
+    // use typeid() comparison, e.g., when our types may travel across
+    // different shared libraries.
+    template<typename ValueType, std::size_t OptimizedForSize, std::size_t OptimizeForAlignment>
+    inline ValueType * unsafe_any_cast(basic_any<OptimizedForSize, OptimizeForAlignment> * operand) BOOST_NOEXCEPT
+    {
+        return static_cast<ValueType*>(operand->man(basic_any<OptimizedForSize, OptimizeForAlignment>::UnsafeCast, *operand, 0, 0));
+    }
+
+    template<typename ValueType, std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
+    inline const ValueType * unsafe_any_cast(const basic_any<OptimizeForSize, OptimizeForAlignment> * operand) BOOST_NOEXCEPT
+    {
+        return unsafe_any_cast<ValueType>(const_cast<basic_any<OptimizeForSize, OptimizeForAlignment> *>(operand));
+    }
+
+} // namespace anys
+
+using boost::anys::any_cast;
+using boost::anys::unsafe_any_cast;
+
+} // namespace boost
+
+#endif // #ifndef BOOST_ANYS_BASIC_ANY_HPP_INCLUDED

sources/boost/any/fwd.hpp

@@ -0,0 +1,40 @@
+// Copyright Antony Polukhin, 2021.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// Contributed by Ruslan Arutyunyan
+#ifndef BOOST_ANY_ANYS_FWD_HPP
+#define BOOST_ANY_ANYS_FWD_HPP
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+# pragma once
+#endif
+
+ #include <boost/type_traits/alignment_of.hpp>
+
+namespace boost {
+
+class any;
+
+namespace anys {
+
+template<std::size_t OptimizeForSize = sizeof(void*), std::size_t OptimizeForAlignment = boost::alignment_of<void*>::value>
+class basic_any;
+
+namespace detail {
+    template <class T>
+    struct is_basic_any: public false_type {};
+
+
+    template<std::size_t OptimizeForSize, std::size_t OptimizeForAlignment>
+    struct is_basic_any<boost::anys::basic_any<OptimizeForSize, OptimizeForAlignment> > : public true_type {};
+} // namespace detail
+
+} // namespace anys
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_ANY_ANYS_FWD_HPP

sources/boost/archive/detail/check.hpp

@@ -4,12 +4,14 @@
 // MS compatible compilers support #pragma once
 #if defined(_MSC_VER)
 # pragma once
-#pragma inline_depth(511)
+#if !defined(__clang__)
+#pragma inline_depth(255)
 #pragma inline_recursion(on)
 #endif
+#endif
 
 #if defined(__MWERKS__)
-#pragma inline_depth(511)
+#pragma inline_depth(255)
 #endif
 
 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8

sources/boost/archive/detail/iserializer.hpp

@@ -2,14 +2,16 @@
 #define BOOST_ARCHIVE_DETAIL_ISERIALIZER_HPP
 
 // MS compatible compilers support #pragma once
-#if defined(_MSC_VER)
+#if defined(BOOST_MSVC)
 # pragma once
-#pragma inline_depth(511)
+#if !defined(__clang__)
+#pragma inline_depth(255)
 #pragma inline_recursion(on)
 #endif
+#endif
 
 #if defined(__MWERKS__)
-#pragma inline_depth(511)
+#pragma inline_depth(255)
 #endif
 
 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8

sources/boost/archive/detail/oserializer.hpp

@@ -4,12 +4,14 @@
 // MS compatible compilers support #pragma once
 #if defined(_MSC_VER)
 # pragma once
-#pragma inline_depth(511)
+#if !defined(__clang__)
+#pragma inline_depth(255)
 #pragma inline_recursion(on)
 #endif
+#endif
 
 #if defined(__MWERKS__)
-#pragma inline_depth(511)
+#pragma inline_depth(255)
 #endif
 
 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8

sources/boost/archive/impl/basic_text_iprimitive.ipp

@@ -112,8 +112,8 @@ basic_text_iprimitive<IStream>::basic_text_iprimitive(
 ) :
     is(is_),
     flags_saver(is_),
-    precision_saver(is_),
 #ifndef BOOST_NO_STD_LOCALE
+    precision_saver(is_),
     codecvt_null_facet(1),
     archive_locale(is.getloc(), & codecvt_null_facet),
     locale_saver(is)
@@ -125,6 +125,7 @@ basic_text_iprimitive<IStream>::basic_text_iprimitive(
     is_ >> std::noboolalpha;
 }
 #else
+    precision_saver(is_)
 {}
 #endif
 

sources/boost/archive/impl/basic_text_oprimitive.ipp

@@ -87,8 +87,8 @@ basic_text_oprimitive<OStream>::basic_text_oprimitive(
 ) : 
     os(os_),
     flags_saver(os_),
-    precision_saver(os_),
 #ifndef BOOST_NO_STD_LOCALE
+    precision_saver(os_),
     codecvt_null_facet(1),
     archive_locale(os.getloc(), & codecvt_null_facet),
     locale_saver(os)
@@ -100,6 +100,7 @@ basic_text_oprimitive<OStream>::basic_text_oprimitive(
     os_ << std::noboolalpha;
 }
 #else
+    precision_saver(os_)
 {}
 #endif
 

sources/boost/asio.hpp

@@ -2,7 +2,7 @@
 // asio.hpp
 // ~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -19,12 +19,17 @@
 
 #include <boost/asio/associated_allocator.hpp>
 #include <boost/asio/associated_executor.hpp>
+#include <boost/asio/associated_cancellation_slot.hpp>
+#include <boost/asio/associator.hpp>
 #include <boost/asio/async_result.hpp>
 #include <boost/asio/awaitable.hpp>
 #include <boost/asio/basic_datagram_socket.hpp>
 #include <boost/asio/basic_deadline_timer.hpp>
+#include <boost/asio/basic_file.hpp>
 #include <boost/asio/basic_io_object.hpp>
+#include <boost/asio/basic_random_access_file.hpp>
 #include <boost/asio/basic_raw_socket.hpp>
+#include <boost/asio/basic_readable_pipe.hpp>
 #include <boost/asio/basic_seq_packet_socket.hpp>
 #include <boost/asio/basic_serial_port.hpp>
 #include <boost/asio/basic_signal_set.hpp>
@@ -32,11 +37,15 @@
 #include <boost/asio/basic_socket_acceptor.hpp>
 #include <boost/asio/basic_socket_iostream.hpp>
 #include <boost/asio/basic_socket_streambuf.hpp>
+#include <boost/asio/basic_stream_file.hpp>
 #include <boost/asio/basic_stream_socket.hpp>
 #include <boost/asio/basic_streambuf.hpp>
 #include <boost/asio/basic_waitable_timer.hpp>
+#include <boost/asio/basic_writable_pipe.hpp>
+#include <boost/asio/bind_cancellation_slot.hpp>
 #include <boost/asio/bind_executor.hpp>
 #include <boost/asio/buffer.hpp>
+#include <boost/asio/buffer_registration.hpp>
 #include <boost/asio/buffered_read_stream_fwd.hpp>
 #include <boost/asio/buffered_read_stream.hpp>
 #include <boost/asio/buffered_stream_fwd.hpp>
@@ -44,10 +53,14 @@
 #include <boost/asio/buffered_write_stream_fwd.hpp>
 #include <boost/asio/buffered_write_stream.hpp>
 #include <boost/asio/buffers_iterator.hpp>
+#include <boost/asio/cancellation_signal.hpp>
+#include <boost/asio/cancellation_state.hpp>
+#include <boost/asio/cancellation_type.hpp>
 #include <boost/asio/co_spawn.hpp>
 #include <boost/asio/completion_condition.hpp>
 #include <boost/asio/compose.hpp>
 #include <boost/asio/connect.hpp>
+#include <boost/asio/connect_pipe.hpp>
 #include <boost/asio/coroutine.hpp>
 #include <boost/asio/deadline_timer.hpp>
 #include <boost/asio/defer.hpp>
@@ -85,6 +98,7 @@
 #include <boost/asio/execution_context.hpp>
 #include <boost/asio/executor.hpp>
 #include <boost/asio/executor_work_guard.hpp>
+#include <boost/asio/file_base.hpp>
 #include <boost/asio/generic/basic_endpoint.hpp>
 #include <boost/asio/generic/datagram_protocol.hpp>
 #include <boost/asio/generic/raw_protocol.hpp>
@@ -141,10 +155,13 @@
 #include <boost/asio/post.hpp>
 #include <boost/asio/prefer.hpp>
 #include <boost/asio/query.hpp>
+#include <boost/asio/random_access_file.hpp>
 #include <boost/asio/read.hpp>
 #include <boost/asio/read_at.hpp>
 #include <boost/asio/read_until.hpp>
+#include <boost/asio/readable_pipe.hpp>
 #include <boost/asio/redirect_error.hpp>
+#include <boost/asio/registered_buffer.hpp>
 #include <boost/asio/require.hpp>
 #include <boost/asio/require_concept.hpp>
 #include <boost/asio/serial_port.hpp>
@@ -154,6 +171,7 @@
 #include <boost/asio/static_thread_pool.hpp>
 #include <boost/asio/steady_timer.hpp>
 #include <boost/asio/strand.hpp>
+#include <boost/asio/stream_file.hpp>
 #include <boost/asio/streambuf.hpp>
 #include <boost/asio/system_context.hpp>
 #include <boost/asio/system_executor.hpp>
@@ -175,6 +193,7 @@
 #include <boost/asio/windows/overlapped_ptr.hpp>
 #include <boost/asio/windows/random_access_handle.hpp>
 #include <boost/asio/windows/stream_handle.hpp>
+#include <boost/asio/writable_pipe.hpp>
 #include <boost/asio/write.hpp>
 #include <boost/asio/write_at.hpp>
 

sources/boost/asio/any_io_executor.hpp

@@ -2,7 +2,7 @@
 // any_io_executor.hpp
 // ~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -49,19 +49,245 @@ typedef executor any_io_executor;
  *   execution::prefer_only<execution::relationship_t::continuation_t>
  * > @endcode
  */
+class any_io_executor :
 #if defined(GENERATING_DOCUMENTATION)
-typedef execution::any_executor<...> any_io_executor;
+  public execution::any_executor<...>
 #else // defined(GENERATING_DOCUMENTATION)
-typedef execution::any_executor<
+  public execution::any_executor<
-    execution::context_as_t<execution_context&>,
+      execution::context_as_t<execution_context&>,
-    execution::blocking_t::never_t,
+      execution::blocking_t::never_t,
-    execution::prefer_only<execution::blocking_t::possibly_t>,
+      execution::prefer_only<execution::blocking_t::possibly_t>,
-    execution::prefer_only<execution::outstanding_work_t::tracked_t>,
+      execution::prefer_only<execution::outstanding_work_t::tracked_t>,
-    execution::prefer_only<execution::outstanding_work_t::untracked_t>,
+      execution::prefer_only<execution::outstanding_work_t::untracked_t>,
-    execution::prefer_only<execution::relationship_t::fork_t>,
+      execution::prefer_only<execution::relationship_t::fork_t>,
-    execution::prefer_only<execution::relationship_t::continuation_t>
+      execution::prefer_only<execution::relationship_t::continuation_t>
-  > any_io_executor;
+    >
 #endif // defined(GENERATING_DOCUMENTATION)
+{
+public:
+#if !defined(GENERATING_DOCUMENTATION)
+  typedef execution::any_executor<
+      execution::context_as_t<execution_context&>,
+      execution::blocking_t::never_t,
+      execution::prefer_only<execution::blocking_t::possibly_t>,
+      execution::prefer_only<execution::outstanding_work_t::tracked_t>,
+      execution::prefer_only<execution::outstanding_work_t::untracked_t>,
+      execution::prefer_only<execution::relationship_t::fork_t>,
+      execution::prefer_only<execution::relationship_t::continuation_t>
+    > base_type;
+
+  typedef void supportable_properties_type(
+      execution::context_as_t<execution_context&>,
+      execution::blocking_t::never_t,
+      execution::prefer_only<execution::blocking_t::possibly_t>,
+      execution::prefer_only<execution::outstanding_work_t::tracked_t>,
+      execution::prefer_only<execution::outstanding_work_t::untracked_t>,
+      execution::prefer_only<execution::relationship_t::fork_t>,
+      execution::prefer_only<execution::relationship_t::continuation_t>
+    );
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+  /// Default constructor.
+  BOOST_ASIO_DECL any_io_executor() BOOST_ASIO_NOEXCEPT;
+
+  /// Construct in an empty state. Equivalent effects to default constructor.
+  BOOST_ASIO_DECL any_io_executor(nullptr_t) BOOST_ASIO_NOEXCEPT;
+
+  /// Copy constructor.
+  BOOST_ASIO_DECL any_io_executor(const any_io_executor& e) BOOST_ASIO_NOEXCEPT;
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move constructor.
+  BOOST_ASIO_DECL any_io_executor(any_io_executor&& e) BOOST_ASIO_NOEXCEPT;
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Construct to point to the same target as another any_executor.
+#if defined(GENERATING_DOCUMENTATION)
+  template <class... OtherSupportableProperties>
+    any_io_executor(execution::any_executor<OtherSupportableProperties...> e);
+#else // defined(GENERATING_DOCUMENTATION)
+  template <typename OtherAnyExecutor>
+  any_io_executor(OtherAnyExecutor e,
+      typename constraint<
+        conditional<
+          !is_same<OtherAnyExecutor, any_io_executor>::value
+            && is_base_of<execution::detail::any_executor_base,
+              OtherAnyExecutor>::value,
+          typename execution::detail::supportable_properties<
+            0, supportable_properties_type>::template
+              is_valid_target<OtherAnyExecutor>,
+          false_type
+        >::type::value
+      >::type = 0)
+    : base_type(BOOST_ASIO_MOVE_CAST(OtherAnyExecutor)(e))
+  {
+  }
+#endif // defined(GENERATING_DOCUMENTATION)
+
+  /// Construct a polymorphic wrapper for the specified executor.
+#if defined(GENERATING_DOCUMENTATION)
+  template <BOOST_ASIO_EXECUTION_EXECUTOR Executor>
+  any_io_executor(Executor e);
+#else // defined(GENERATING_DOCUMENTATION)
+  template <BOOST_ASIO_EXECUTION_EXECUTOR Executor>
+  any_io_executor(Executor e,
+      typename constraint<
+        conditional<
+          !is_same<Executor, any_io_executor>::value
+            && !is_base_of<execution::detail::any_executor_base,
+              Executor>::value,
+          execution::detail::is_valid_target_executor<
+            Executor, supportable_properties_type>,
+          false_type
+        >::type::value
+      >::type = 0)
+    : base_type(BOOST_ASIO_MOVE_CAST(Executor)(e))
+  {
+  }
+#endif // defined(GENERATING_DOCUMENTATION)
+
+  /// Assignment operator.
+  BOOST_ASIO_DECL any_io_executor& operator=(
+      const any_io_executor& e) BOOST_ASIO_NOEXCEPT;
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move assignment operator.
+  BOOST_ASIO_DECL any_io_executor& operator=(
+      any_io_executor&& e) BOOST_ASIO_NOEXCEPT;
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Assignment operator that sets the polymorphic wrapper to the empty state.
+  BOOST_ASIO_DECL any_io_executor& operator=(nullptr_t);
+
+  /// Destructor.
+  BOOST_ASIO_DECL ~any_io_executor();
+
+  /// Swap targets with another polymorphic wrapper.
+  BOOST_ASIO_DECL void swap(any_io_executor& other) BOOST_ASIO_NOEXCEPT;
+
+  /// Obtain a polymorphic wrapper with the specified property.
+  /**
+   * Do not call this function directly. It is intended for use with the
+   * boost::asio::require and boost::asio::prefer customisation points.
+   *
+   * For example:
+   * @code any_io_executor ex = ...;
+   * auto ex2 = boost::asio::require(ex, execution::blocking.possibly); @endcode
+   */
+  template <typename Property>
+  any_io_executor require(const Property& p,
+      typename constraint<
+        traits::require_member<const base_type&, const Property&>::is_valid
+      >::type = 0) const
+  {
+    return static_cast<const base_type&>(*this).require(p);
+  }
+
+  /// Obtain a polymorphic wrapper with the specified property.
+  /**
+   * Do not call this function directly. It is intended for use with the
+   * boost::asio::prefer customisation point.
+   *
+   * For example:
+   * @code any_io_executor ex = ...;
+   * auto ex2 = boost::asio::prefer(ex, execution::blocking.possibly); @endcode
+   */
+  template <typename Property>
+  any_io_executor prefer(const Property& p,
+      typename constraint<
+        traits::prefer_member<const base_type&, const Property&>::is_valid
+      >::type = 0) const
+  {
+    return static_cast<const base_type&>(*this).prefer(p);
+  }
+};
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::require(
+    const execution::blocking_t::never_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::blocking_t::possibly_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::outstanding_work_t::tracked_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::outstanding_work_t::untracked_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::relationship_t::fork_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::relationship_t::continuation_t&, int) const;
+
+namespace traits {
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+
+template <>
+struct equality_comparable<any_io_executor>
+{
+  static const bool is_valid = true;
+  static const bool is_noexcept = true;
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
+
+template <typename F>
+struct execute_member<any_io_executor, F>
+{
+  static const bool is_valid = true;
+  static const bool is_noexcept = false;
+  typedef void result_type;
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+
+template <typename Prop>
+struct query_member<any_io_executor, Prop> :
+  query_member<any_io_executor::base_type, Prop>
+{
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT)
+
+template <typename Prop>
+struct require_member<any_io_executor, Prop> :
+  require_member<any_io_executor::base_type, Prop>
+{
+  typedef any_io_executor result_type;
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT)
+
+#if !defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT)
+
+template <typename Prop>
+struct prefer_member<any_io_executor, Prop> :
+  prefer_member<any_io_executor::base_type, Prop>
+{
+  typedef any_io_executor result_type;
+};
+
+#endif // !defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT)
+
+} // namespace traits
+
+#endif // !defined(GENERATING_DOCUMENTATION)
 
 #endif // defined(BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
 
@@ -70,4 +296,10 @@ typedef execution::any_executor<
 
 #include <boost/asio/detail/pop_options.hpp>
 
+#if defined(BOOST_ASIO_HEADER_ONLY) \
+  && !defined(BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
+# include <boost/asio/impl/any_io_executor.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+       //   && !defined(BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
+
 #endif // BOOST_ASIO_ANY_IO_EXECUTOR_HPP

sources/boost/asio/associated_allocator.hpp

@@ -2,7 +2,7 @@
 // associated_allocator.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -17,15 +17,33 @@
 
 #include <boost/asio/detail/config.hpp>
 #include <memory>
+#include <boost/asio/associator.hpp>
+#include <boost/asio/detail/functional.hpp>
 #include <boost/asio/detail/type_traits.hpp>
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
 namespace asio {
+
+template <typename T, typename Allocator>
+struct associated_allocator;
+
 namespace detail {
 
-template <typename T, typename E, typename = void>
+template <typename T, typename = void>
+struct has_allocator_type : false_type
+{
+};
+
+template <typename T>
+struct has_allocator_type<T,
+  typename void_type<typename T::executor_type>::type>
+    : true_type
+{
+};
+
+template <typename T, typename E, typename = void, typename = void>
 struct associated_allocator_impl
 {
   typedef E type;
@@ -48,6 +66,17 @@ struct associated_allocator_impl<T, E,
   }
 };
 
+template <typename T, typename E>
+struct associated_allocator_impl<T, E,
+  typename enable_if<
+    !has_allocator_type<T>::value
+  >::type,
+  typename void_type<
+    typename associator<associated_allocator, T, E>::type
+  >::type> : associator<associated_allocator, T, E>
+{
+};
+
 } // namespace detail
 
 /// Traits type used to obtain the allocator associated with an object.
@@ -119,6 +148,29 @@ using associated_allocator_t
 
 #endif // defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
 
+#if defined(BOOST_ASIO_HAS_STD_REFERENCE_WRAPPER) \
+  || defined(GENERATING_DOCUMENTATION)
+
+/// Specialisation of associated_allocator for @c std::reference_wrapper.
+template <typename T, typename Allocator>
+struct associated_allocator<reference_wrapper<T>, Allocator>
+{
+  /// Forwards @c type to the associator specialisation for the unwrapped type
+  /// @c T.
+  typedef typename associated_allocator<T, Allocator>::type type;
+
+  /// Forwards the request to get the allocator to the associator specialisation
+  /// for the unwrapped type @c T.
+  static type get(reference_wrapper<T> t,
+      const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT
+  {
+    return associated_allocator<T, Allocator>::get(t.get(), a);
+  }
+};
+
+#endif // defined(BOOST_ASIO_HAS_STD_REFERENCE_WRAPPER)
+       //   || defined(GENERATING_DOCUMENTATION)
+
 } // namespace asio
 } // namespace boost
 

sources/boost/asio/associated_cancellation_slot.hpp

@@ -0,0 +1,179 @@
+//
+// associated_cancellation_slot.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_ASSOCIATED_CANCELLATION_SLOT_HPP
+#define BOOST_ASIO_ASSOCIATED_CANCELLATION_SLOT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/associator.hpp>
+#include <boost/asio/cancellation_signal.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+template <typename T, typename CancellationSlot>
+struct associated_cancellation_slot;
+
+namespace detail {
+
+template <typename T, typename = void>
+struct has_cancellation_slot_type : false_type
+{
+};
+
+template <typename T>
+struct has_cancellation_slot_type<T,
+  typename void_type<typename T::cancellation_slot_type>::type>
+    : true_type
+{
+};
+
+template <typename T, typename S, typename = void, typename = void>
+struct associated_cancellation_slot_impl
+{
+  typedef void asio_associated_cancellation_slot_is_unspecialised;
+
+  typedef S type;
+
+  static type get(const T&, const S& s = S()) BOOST_ASIO_NOEXCEPT
+  {
+    return s;
+  }
+};
+
+template <typename T, typename S>
+struct associated_cancellation_slot_impl<T, S,
+  typename void_type<typename T::cancellation_slot_type>::type>
+{
+  typedef typename T::cancellation_slot_type type;
+
+  static type get(const T& t, const S& = S()) BOOST_ASIO_NOEXCEPT
+  {
+    return t.get_cancellation_slot();
+  }
+};
+
+template <typename T, typename S>
+struct associated_cancellation_slot_impl<T, S,
+  typename enable_if<
+    !has_cancellation_slot_type<T>::value
+  >::type,
+  typename void_type<
+    typename associator<associated_cancellation_slot, T, S>::type
+  >::type> : associator<associated_cancellation_slot, T, S>
+{
+};
+
+} // namespace detail
+
+/// Traits type used to obtain the cancellation_slot associated with an object.
+/**
+ * A program may specialise this traits type if the @c T template parameter in
+ * the specialisation is a user-defined type. The template parameter @c
+ * CancellationSlot shall be a type meeting the CancellationSlot requirements.
+ *
+ * Specialisations shall meet the following requirements, where @c t is a const
+ * reference to an object of type @c T, and @c s is an object of type @c
+ * CancellationSlot.
+ *
+ * @li Provide a nested typedef @c type that identifies a type meeting the
+ * CancellationSlot requirements.
+ *
+ * @li Provide a noexcept static member function named @c get, callable as @c
+ * get(t) and with return type @c type.
+ *
+ * @li Provide a noexcept static member function named @c get, callable as @c
+ * get(t,s) and with return type @c type.
+ */
+template <typename T, typename CancellationSlot = cancellation_slot>
+struct associated_cancellation_slot
+#if !defined(GENERATING_DOCUMENTATION)
+  : detail::associated_cancellation_slot_impl<T, CancellationSlot>
+#endif // !defined(GENERATING_DOCUMENTATION)
+{
+#if defined(GENERATING_DOCUMENTATION)
+  /// If @c T has a nested type @c cancellation_slot_type,
+  /// <tt>T::cancellation_slot_type</tt>. Otherwise
+  /// @c CancellationSlot.
+  typedef see_below type;
+
+  /// If @c T has a nested type @c cancellation_slot_type, returns
+  /// <tt>t.get_cancellation_slot()</tt>. Otherwise returns @c s.
+  static type get(const T& t,
+      const CancellationSlot& s = CancellationSlot()) BOOST_ASIO_NOEXCEPT;
+#endif // defined(GENERATING_DOCUMENTATION)
+};
+
+/// Helper function to obtain an object's associated cancellation_slot.
+/**
+ * @returns <tt>associated_cancellation_slot<T>::get(t)</tt>
+ */
+template <typename T>
+inline typename associated_cancellation_slot<T>::type
+get_associated_cancellation_slot(const T& t) BOOST_ASIO_NOEXCEPT
+{
+  return associated_cancellation_slot<T>::get(t);
+}
+
+/// Helper function to obtain an object's associated cancellation_slot.
+/**
+ * @returns <tt>associated_cancellation_slot<T,
+ * CancellationSlot>::get(t, st)</tt>
+ */
+template <typename T, typename CancellationSlot>
+inline typename associated_cancellation_slot<T, CancellationSlot>::type
+get_associated_cancellation_slot(const T& t,
+    const CancellationSlot& st) BOOST_ASIO_NOEXCEPT
+{
+  return associated_cancellation_slot<T, CancellationSlot>::get(t, st);
+}
+
+#if defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
+
+template <typename T, typename CancellationSlot = cancellation_slot>
+using associated_cancellation_slot_t =
+  typename associated_cancellation_slot<T, CancellationSlot>::type;
+
+#endif // defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
+
+namespace detail {
+
+template <typename T, typename S, typename = void>
+struct associated_cancellation_slot_forwarding_base
+{
+};
+
+template <typename T, typename S>
+struct associated_cancellation_slot_forwarding_base<T, S,
+    typename enable_if<
+      is_same<
+        typename associated_cancellation_slot<T,
+          S>::asio_associated_cancellation_slot_is_unspecialised,
+        void
+      >::value
+    >::type>
+{
+  typedef void asio_associated_cancellation_slot_is_unspecialised;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_ASSOCIATED_CANCELLATION_SLOT_HPP

sources/boost/asio/associated_executor.hpp

@@ -2,7 +2,7 @@
 // associated_executor.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -16,6 +16,8 @@
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
 #include <boost/asio/detail/config.hpp>
+#include <boost/asio/associator.hpp>
+#include <boost/asio/detail/functional.hpp>
 #include <boost/asio/detail/type_traits.hpp>
 #include <boost/asio/execution/executor.hpp>
 #include <boost/asio/is_executor.hpp>
@@ -25,9 +27,25 @@
 
 namespace boost {
 namespace asio {
+
+template <typename T, typename Executor>
+struct associated_executor;
+
 namespace detail {
 
-template <typename T, typename E, typename = void>
+template <typename T, typename = void>
+struct has_executor_type : false_type
+{
+};
+
+template <typename T>
+struct has_executor_type<T,
+  typename void_type<typename T::executor_type>::type>
+    : true_type
+{
+};
+
+template <typename T, typename E, typename = void, typename = void>
 struct associated_executor_impl
 {
   typedef void asio_associated_executor_is_unspecialised;
@@ -52,6 +70,17 @@ struct associated_executor_impl<T, E,
   }
 };
 
+template <typename T, typename E>
+struct associated_executor_impl<T, E,
+  typename enable_if<
+    !has_executor_type<T>::value
+  >::type,
+  typename void_type<
+    typename associator<associated_executor, T, E>::type
+  >::type> : associator<associated_executor, T, E>
+{
+};
+
 } // namespace detail
 
 /// Traits type used to obtain the executor associated with an object.
@@ -109,9 +138,9 @@ get_associated_executor(const T& t) BOOST_ASIO_NOEXCEPT
 template <typename T, typename Executor>
 inline typename associated_executor<T, Executor>::type
 get_associated_executor(const T& t, const Executor& ex,
-    typename enable_if<
+    typename constraint<
       is_executor<Executor>::value || execution::is_executor<Executor>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return associated_executor<T, Executor>::get(t, ex);
 }
@@ -125,8 +154,8 @@ template <typename T, typename ExecutionContext>
 inline typename associated_executor<T,
   typename ExecutionContext::executor_type>::type
 get_associated_executor(const T& t, ExecutionContext& ctx,
-    typename enable_if<is_convertible<ExecutionContext&,
+    typename constraint<is_convertible<ExecutionContext&,
-      execution_context&>::value>::type* = 0) BOOST_ASIO_NOEXCEPT
+      execution_context&>::value>::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return associated_executor<T,
     typename ExecutionContext::executor_type>::get(t, ctx.get_executor());
@@ -160,6 +189,33 @@ struct associated_executor_forwarding_base<T, E,
 };
 
 } // namespace detail
+
+#if defined(BOOST_ASIO_HAS_STD_REFERENCE_WRAPPER) \
+  || defined(GENERATING_DOCUMENTATION)
+
+/// Specialisation of associated_executor for @c std::reference_wrapper.
+template <typename T, typename Executor>
+struct associated_executor<reference_wrapper<T>, Executor>
+#if !defined(GENERATING_DOCUMENTATION)
+  : detail::associated_executor_forwarding_base<T, Executor>
+#endif // !defined(GENERATING_DOCUMENTATION)
+{
+  /// Forwards @c type to the associator specialisation for the unwrapped type
+  /// @c T.
+  typedef typename associated_executor<T, Executor>::type type;
+
+  /// Forwards the request to get the executor to the associator specialisation
+  /// for the unwrapped type @c T.
+  static type get(reference_wrapper<T> t,
+      const Executor& ex = Executor()) BOOST_ASIO_NOEXCEPT
+  {
+    return associated_executor<T, Executor>::get(t.get(), ex);
+  }
+};
+
+#endif // defined(BOOST_ASIO_HAS_STD_REFERENCE_WRAPPER)
+       //   || defined(GENERATING_DOCUMENTATION)
+
 } // namespace asio
 } // namespace boost
 

sources/boost/asio/associator.hpp

@@ -0,0 +1,37 @@
+//
+// associator.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_ASSOCIATOR_HPP
+#define BOOST_ASIO_ASSOCIATOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+/// Used to generically specialise associators for a type.
+template <template <typename, typename> class Associator,
+    typename T, typename DefaultCandidate>
+struct associator
+{
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_ASSOCIATOR_HPP

sources/boost/asio/awaitable.hpp

@@ -2,7 +2,7 @@
 // awaitable.hpp
 // ~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -48,7 +48,7 @@ template <typename, typename> class awaitable_frame;
 
 /// The return type of a coroutine or asynchronous operation.
 template <typename T, typename Executor = any_io_executor>
-class awaitable
+class BOOST_ASIO_NODISCARD awaitable
 {
 public:
   /// The type of the awaited value.
@@ -76,6 +76,14 @@ public:
       frame_->destroy();
   }
 
+  /// Move assignment.
+  awaitable& operator=(awaitable&& other) noexcept
+  {
+    if (this != &other)
+      frame_ = std::exchange(other.frame_, nullptr);
+    return *this;
+  }
+
   /// Checks if the awaitable refers to a future result.
   bool valid() const noexcept
   {

sources/boost/asio/basic_datagram_socket.hpp

@@ -2,7 +2,7 @@
 // basic_datagram_socket.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -46,6 +46,13 @@ class basic_datagram_socket;
  * @par Thread Safety
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
+ *
+ * Synchronous @c send, @c send_to, @c receive, @c receive_from, and @c connect
+ * operations are thread safe with respect to each other, if the underlying
+ * operating system calls are also thread safe. This means that it is permitted
+ * to perform concurrent calls to these synchronous operations on a single
+ * socket object. Other synchronous operations, such as @c open or @c close, are
+ * not thread safe.
  */
 template <typename Protocol, typename Executor>
 class basic_datagram_socket
@@ -101,9 +108,9 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_datagram_socket(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context)
   {
   }
@@ -139,9 +146,10 @@ public:
   template <typename ExecutionContext>
   basic_datagram_socket(ExecutionContext& context,
       const protocol_type& protocol,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
+      >::type = defaulted_constraint())
     : basic_socket<Protocol, Executor>(context, protocol)
   {
   }
@@ -185,9 +193,9 @@ public:
   template <typename ExecutionContext>
   basic_datagram_socket(ExecutionContext& context,
       const endpoint_type& endpoint,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context, endpoint)
   {
   }
@@ -230,9 +238,9 @@ public:
   template <typename ExecutionContext>
   basic_datagram_socket(ExecutionContext& context,
       const protocol_type& protocol, const native_handle_type& native_socket,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context, protocol, native_socket)
   {
   }
@@ -286,10 +294,10 @@ public:
    */
   template <typename Protocol1, typename Executor1>
   basic_datagram_socket(basic_datagram_socket<Protocol1, Executor1>&& other,
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol1, Protocol>::value
           && is_convertible<Executor1, Executor>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(std::move(other))
   {
   }
@@ -308,7 +316,7 @@ public:
    * constructor.
    */
   template <typename Protocol1, typename Executor1>
-  typename enable_if<
+  typename constraint<
     is_convertible<Protocol1, Protocol>::value
       && is_convertible<Executor1, Executor>::value,
     basic_datagram_socket&
@@ -447,6 +455,16 @@ public:
    * See the @ref buffer documentation for information on sending multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -491,6 +509,16 @@ public:
    * @note The async_send operation can only be used with a connected socket.
    * Use the async_send_to function to send data on an unconnected datagram
    * socket.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -632,6 +660,16 @@ public:
    * See the @ref buffer documentation for information on sending multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -676,6 +714,16 @@ public:
    * not, the handler will not be invoked from within this function. On
    * immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -817,6 +865,16 @@ public:
    * See the @ref buffer documentation for information on receiving into
    * multiple buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -861,6 +919,16 @@ public:
    * @note The async_receive operation can only be used with a connected socket.
    * Use the async_receive_from function to receive data on an unconnected
    * datagram socket.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -1002,6 +1070,16 @@ public:
    * See the @ref buffer documentation for information on receiving into
    * multiple buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -1048,6 +1126,16 @@ public:
    * not, the handler will not be invoked from within this function. On
    * immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,

sources/boost/asio/basic_deadline_timer.hpp

@@ -2,7 +2,7 @@
 // basic_deadline_timer.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -160,7 +160,7 @@ public:
    * dispatch handlers for any asynchronous operations performed on the timer.
    */
   explicit basic_deadline_timer(const executor_type& ex)
-    : impl_(ex)
+    : impl_(0, ex)
   {
   }
 
@@ -176,10 +176,10 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_deadline_timer(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
   }
 
@@ -194,7 +194,7 @@ public:
    * as an absolute time.
    */
   basic_deadline_timer(const executor_type& ex, const time_type& expiry_time)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().expires_at(impl_.get_implementation(), expiry_time, ec);
@@ -214,10 +214,10 @@ public:
    */
   template <typename ExecutionContext>
   basic_deadline_timer(ExecutionContext& context, const time_type& expiry_time,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().expires_at(impl_.get_implementation(), expiry_time, ec);
@@ -236,7 +236,7 @@ public:
    */
   basic_deadline_timer(const executor_type& ex,
       const duration_type& expiry_time)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().expires_from_now(
@@ -258,10 +258,10 @@ public:
   template <typename ExecutionContext>
   basic_deadline_timer(ExecutionContext& context,
       const duration_type& expiry_time,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().expires_from_now(
@@ -628,6 +628,16 @@ public:
    * not, the handler will not be invoked from within this function. On
    * immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))

sources/boost/asio/basic_file.hpp

@@ -0,0 +1,831 @@
+//
+// basic_file.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_BASIC_FILE_HPP
+#define BOOST_ASIO_BASIC_FILE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_FILE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#include <string>
+#include <boost/asio/any_io_executor.hpp>
+#include <boost/asio/async_result.hpp>
+#include <boost/asio/detail/cstdint.hpp>
+#include <boost/asio/detail/handler_type_requirements.hpp>
+#include <boost/asio/detail/io_object_impl.hpp>
+#include <boost/asio/detail/non_const_lvalue.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/error.hpp>
+#include <boost/asio/execution_context.hpp>
+#include <boost/asio/post.hpp>
+#include <boost/asio/file_base.hpp>
+#if defined(BOOST_ASIO_HAS_IOCP)
+# include <boost/asio/detail/win_iocp_file_service.hpp>
+#elif defined(BOOST_ASIO_HAS_IO_URING)
+# include <boost/asio/detail/io_uring_file_service.hpp>
+#endif
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+# include <utility>
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+#if !defined(BOOST_ASIO_BASIC_FILE_FWD_DECL)
+#define BOOST_ASIO_BASIC_FILE_FWD_DECL
+
+// Forward declaration with defaulted arguments.
+template <typename Executor = any_io_executor>
+class basic_file;
+
+#endif // !defined(BOOST_ASIO_BASIC_FILE_FWD_DECL)
+
+/// Provides file functionality.
+/**
+ * The basic_file class template provides functionality that is common to both
+ * stream-oriented and random-access files.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename Executor>
+class basic_file
+  : public file_base
+{
+public:
+  /// The type of the executor associated with the object.
+  typedef Executor executor_type;
+
+  /// Rebinds the file type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The file type when rebound to the specified executor.
+    typedef basic_file<Executor1> other;
+  };
+
+  /// The native representation of a file.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_handle_type;
+#elif defined(BOOST_ASIO_HAS_IOCP)
+  typedef detail::win_iocp_file_service::native_handle_type native_handle_type;
+#elif defined(BOOST_ASIO_HAS_IO_URING)
+  typedef detail::io_uring_file_service::native_handle_type native_handle_type;
+#endif
+
+  /// Construct a basic_file without opening it.
+  /**
+   * This constructor initialises a file without opening it.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   */
+  explicit basic_file(const executor_type& ex)
+    : impl_(0, ex)
+  {
+  }
+
+  /// Construct a basic_file without opening it.
+  /**
+   * This constructor initialises a file without opening it.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   */
+  template <typename ExecutionContext>
+  explicit basic_file(ExecutionContext& context,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
+  {
+  }
+
+  /// Construct and open a basic_file.
+  /**
+   * This constructor initialises a file and opens it.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   */
+  explicit basic_file(const executor_type& ex,
+      const char* path, file_base::flags open_flags)
+    : impl_(0, ex)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().open(impl_.get_implementation(), path, open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Construct a basic_file without opening it.
+  /**
+   * This constructor initialises a file and opens it.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   */
+  template <typename ExecutionContext>
+  explicit basic_file(ExecutionContext& context,
+      const char* path, file_base::flags open_flags,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().open(impl_.get_implementation(), path, open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Construct and open a basic_file.
+  /**
+   * This constructor initialises a file and opens it.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   */
+  explicit basic_file(const executor_type& ex,
+      const std::string& path, file_base::flags open_flags)
+    : impl_(0, ex)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().open(impl_.get_implementation(),
+        path.c_str(), open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Construct a basic_file without opening it.
+  /**
+   * This constructor initialises a file and opens it.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   */
+  template <typename ExecutionContext>
+  explicit basic_file(ExecutionContext& context,
+      const std::string& path, file_base::flags open_flags,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().open(impl_.get_implementation(),
+        path.c_str(), open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Construct a basic_file on an existing native file handle.
+  /**
+   * This constructor initialises a file object to hold an existing native file.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param native_file A native file handle.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_file(const executor_type& ex, const native_handle_type& native_file)
+    : impl_(0, ex)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(
+        impl_.get_implementation(), native_file, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+  /// Construct a basic_file on an existing native file.
+  /**
+   * This constructor initialises a file object to hold an existing native file.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param native_file A native file.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_file(ExecutionContext& context, const native_handle_type& native_file,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(
+        impl_.get_implementation(), native_file, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move-construct a basic_file from another.
+  /**
+   * This constructor moves a file from one object to another.
+   *
+   * @param other The other basic_file object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_file(const executor_type&) constructor.
+   */
+  basic_file(basic_file&& other) BOOST_ASIO_NOEXCEPT
+    : impl_(std::move(other.impl_))
+  {
+  }
+
+  /// Move-assign a basic_file from another.
+  /**
+   * This assignment operator moves a file from one object to another.
+   *
+   * @param other The other basic_file object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_file(const executor_type&) constructor.
+   */
+  basic_file& operator=(basic_file&& other)
+  {
+    impl_ = std::move(other.impl_);
+    return *this;
+  }
+
+  // All files have access to each other's implementations.
+  template <typename Executor1>
+  friend class basic_file;
+
+  /// Move-construct a basic_file from a file of another executor type.
+  /**
+   * This constructor moves a file from one object to another.
+   *
+   * @param other The other basic_file object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_file(const executor_type&) constructor.
+   */
+  template <typename Executor1>
+  basic_file(basic_file<Executor1>&& other,
+      typename constraint<
+        is_convertible<Executor1, Executor>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(std::move(other.impl_))
+  {
+  }
+
+  /// Move-assign a basic_file from a file of another executor type.
+  /**
+   * This assignment operator moves a file from one object to another.
+   *
+   * @param other The other basic_file object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_file(const executor_type&) constructor.
+   */
+  template <typename Executor1>
+  typename constraint<
+    is_convertible<Executor1, Executor>::value,
+    basic_file&
+  >::type operator=(basic_file<Executor1> && other)
+  {
+    basic_file tmp(std::move(other));
+    impl_ = std::move(tmp.impl_);
+    return *this;
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Get the executor associated with the object.
+  executor_type get_executor() BOOST_ASIO_NOEXCEPT
+  {
+    return impl_.get_executor();
+  }
+
+  /// Open the file using the specified path.
+  /**
+   * This function opens the file so that it will use the specified path.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * boost::asio::stream_file file(my_context);
+   * file.open("/path/to/my/file", boost::asio::stream_file::read_only);
+   * @endcode
+   */
+  void open(const char* path, file_base::flags open_flags)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().open(impl_.get_implementation(), path, open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Open the file using the specified path.
+  /**
+   * This function opens the file so that it will use the specified path.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * boost::asio::stream_file file(my_context);
+   * boost::system::error_code ec;
+   * file.open("/path/to/my/file", boost::asio::stream_file::read_only, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  BOOST_ASIO_SYNC_OP_VOID open(const char* path,
+      file_base::flags open_flags, boost::system::error_code& ec)
+  {
+    impl_.get_service().open(impl_.get_implementation(), path, open_flags, ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Open the file using the specified path.
+  /**
+   * This function opens the file so that it will use the specified path.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * boost::asio::stream_file file(my_context);
+   * file.open("/path/to/my/file", boost::asio::stream_file::read_only);
+   * @endcode
+   */
+  void open(const std::string& path, file_base::flags open_flags)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().open(impl_.get_implementation(),
+        path.c_str(), open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Open the file using the specified path.
+  /**
+   * This function opens the file so that it will use the specified path.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * boost::asio::stream_file file(my_context);
+   * boost::system::error_code ec;
+   * file.open("/path/to/my/file", boost::asio::stream_file::read_only, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  BOOST_ASIO_SYNC_OP_VOID open(const std::string& path,
+      file_base::flags open_flags, boost::system::error_code& ec)
+  {
+    impl_.get_service().open(impl_.get_implementation(),
+        path.c_str(), open_flags, ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Assign an existing native file to the file.
+  /*
+   * This function opens the file to hold an existing native file.
+   *
+   * @param native_file A native file.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void assign(const native_handle_type& native_file)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(
+        impl_.get_implementation(), native_file, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+  /// Assign an existing native file to the file.
+  /*
+   * This function opens the file to hold an existing native file.
+   *
+   * @param native_file A native file.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID assign(const native_handle_type& native_file,
+      boost::system::error_code& ec)
+  {
+    impl_.get_service().assign(
+        impl_.get_implementation(), native_file, ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Determine whether the file is open.
+  bool is_open() const
+  {
+    return impl_.get_service().is_open(impl_.get_implementation());
+  }
+
+  /// Close the file.
+  /**
+   * This function is used to close the file. Any asynchronous read or write
+   * operations will be cancelled immediately, and will complete with the
+   * boost::asio::error::operation_aborted error.
+   *
+   * @throws boost::system::system_error Thrown on failure. Note that, even if
+   * the function indicates an error, the underlying descriptor is closed.
+   */
+  void close()
+  {
+    boost::system::error_code ec;
+    impl_.get_service().close(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "close");
+  }
+
+  /// Close the file.
+  /**
+   * This function is used to close the file. Any asynchronous read or write
+   * operations will be cancelled immediately, and will complete with the
+   * boost::asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any. Note that, even if
+   * the function indicates an error, the underlying descriptor is closed.
+   *
+   * @par Example
+   * @code
+   * boost::asio::stream_file file(my_context);
+   * ...
+   * boost::system::error_code ec;
+   * file.close(ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  BOOST_ASIO_SYNC_OP_VOID close(boost::system::error_code& ec)
+  {
+    impl_.get_service().close(impl_.get_implementation(), ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Release ownership of the underlying native file.
+  /**
+   * This function causes all outstanding asynchronous read and write
+   * operations to finish immediately, and the handlers for cancelled
+   * operations will be passed the boost::asio::error::operation_aborted error.
+   * Ownership of the native file is then transferred to the caller.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   *
+   * @note This function is unsupported on Windows versions prior to Windows
+   * 8.1, and will fail with boost::asio::error::operation_not_supported on
+   * these platforms.
+   */
+#if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
+  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
+  __declspec(deprecated("This function always fails with "
+        "operation_not_supported when used on Windows versions "
+        "prior to Windows 8.1."))
+#endif
+  native_handle_type release()
+  {
+    boost::system::error_code ec;
+    native_handle_type s = impl_.get_service().release(
+        impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "release");
+    return s;
+  }
+
+  /// Release ownership of the underlying native file.
+  /**
+   * This function causes all outstanding asynchronous read and write
+   * operations to finish immediately, and the handlers for cancelled
+   * operations will be passed the boost::asio::error::operation_aborted error.
+   * Ownership of the native file is then transferred to the caller.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @note This function is unsupported on Windows versions prior to Windows
+   * 8.1, and will fail with boost::asio::error::operation_not_supported on
+   * these platforms.
+   */
+#if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
+  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
+  __declspec(deprecated("This function always fails with "
+        "operation_not_supported when used on Windows versions "
+        "prior to Windows 8.1."))
+#endif
+  native_handle_type release(boost::system::error_code& ec)
+  {
+    return impl_.get_service().release(impl_.get_implementation(), ec);
+  }
+
+  /// Get the native file representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * file. This is intended to allow access to native file functionality
+   * that is not otherwise provided.
+   */
+  native_handle_type native_handle()
+  {
+    return impl_.get_service().native_handle(impl_.get_implementation());
+  }
+
+  /// Cancel all asynchronous operations associated with the file.
+  /**
+   * This function causes all outstanding asynchronous read and write
+   * operations to finish immediately, and the handlers for cancelled
+   * operations will be passed the boost::asio::error::operation_aborted error.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   *
+   * @note Calls to cancel() will always fail with
+   * boost::asio::error::operation_not_supported when run on Windows XP, Windows
+   * Server 2003, and earlier versions of Windows, unless
+   * BOOST_ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has
+   * two issues that should be considered before enabling its use:
+   *
+   * @li It will only cancel asynchronous operations that were initiated in the
+   * current thread.
+   *
+   * @li It can appear to complete without error, but the request to cancel the
+   * unfinished operations may be silently ignored by the operating system.
+   * Whether it works or not seems to depend on the drivers that are installed.
+   *
+   * For portable cancellation, consider using the close() function to
+   * simultaneously cancel the outstanding operations and close the file.
+   *
+   * When running on Windows Vista, Windows Server 2008, and later, the
+   * CancelIoEx function is always used. This function does not have the
+   * problems described above.
+   */
+#if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
+  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \
+  && !defined(BOOST_ASIO_ENABLE_CANCELIO)
+  __declspec(deprecated("By default, this function always fails with "
+        "operation_not_supported when used on Windows XP, Windows Server 2003, "
+        "or earlier. Consult documentation for details."))
+#endif
+  void cancel()
+  {
+    boost::system::error_code ec;
+    impl_.get_service().cancel(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "cancel");
+  }
+
+  /// Cancel all asynchronous operations associated with the file.
+  /**
+   * This function causes all outstanding asynchronous read and write
+   * operations to finish immediately, and the handlers for cancelled
+   * operations will be passed the boost::asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @note Calls to cancel() will always fail with
+   * boost::asio::error::operation_not_supported when run on Windows XP, Windows
+   * Server 2003, and earlier versions of Windows, unless
+   * BOOST_ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has
+   * two issues that should be considered before enabling its use:
+   *
+   * @li It will only cancel asynchronous operations that were initiated in the
+   * current thread.
+   *
+   * @li It can appear to complete without error, but the request to cancel the
+   * unfinished operations may be silently ignored by the operating system.
+   * Whether it works or not seems to depend on the drivers that are installed.
+   *
+   * For portable cancellation, consider using the close() function to
+   * simultaneously cancel the outstanding operations and close the file.
+   *
+   * When running on Windows Vista, Windows Server 2008, and later, the
+   * CancelIoEx function is always used. This function does not have the
+   * problems described above.
+   */
+#if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
+  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \
+  && !defined(BOOST_ASIO_ENABLE_CANCELIO)
+  __declspec(deprecated("By default, this function always fails with "
+        "operation_not_supported when used on Windows XP, Windows Server 2003, "
+        "or earlier. Consult documentation for details."))
+#endif
+  BOOST_ASIO_SYNC_OP_VOID cancel(boost::system::error_code& ec)
+  {
+    impl_.get_service().cancel(impl_.get_implementation(), ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Get the size of the file.
+  /**
+   * This function determines the size of the file, in bytes.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  uint64_t size() const
+  {
+    boost::system::error_code ec;
+    uint64_t s = impl_.get_service().size(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "size");
+    return s;
+  }
+
+  /// Get the size of the file.
+  /**
+   * This function determines the size of the file, in bytes.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  uint64_t size(boost::system::error_code& ec) const
+  {
+    return impl_.get_service().size(impl_.get_implementation(), ec);
+  }
+
+  /// Alter the size of the file.
+  /**
+   * This function resizes the file to the specified size, in bytes. If the
+   * current file size exceeds @c n then any extra data is discarded. If the
+   * current size is less than @c n then the file is extended and filled with
+   * zeroes.
+   *
+   * @param n The new size for the file.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void resize(uint64_t n)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().resize(impl_.get_implementation(), n, ec);
+    boost::asio::detail::throw_error(ec, "resize");
+  }
+
+  /// Alter the size of the file.
+  /**
+   * This function resizes the file to the specified size, in bytes. If the
+   * current file size exceeds @c n then any extra data is discarded. If the
+   * current size is less than @c n then the file is extended and filled with
+   * zeroes.
+   *
+   * @param n The new size for the file.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID resize(uint64_t n, boost::system::error_code& ec)
+  {
+    impl_.get_service().resize(impl_.get_implementation(), n, ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Synchronise the file to disk.
+  /**
+   * This function synchronises the file data and metadata to disk. Note that
+   * the semantics of this synchronisation vary between operation systems.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void sync_all()
+  {
+    boost::system::error_code ec;
+    impl_.get_service().sync_all(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "sync_all");
+  }
+
+  /// Synchronise the file to disk.
+  /**
+   * This function synchronises the file data and metadata to disk. Note that
+   * the semantics of this synchronisation vary between operation systems.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID sync_all(boost::system::error_code& ec)
+  {
+    impl_.get_service().sync_all(impl_.get_implementation(), ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Synchronise the file data to disk.
+  /**
+   * This function synchronises the file data to disk. Note that the semantics
+   * of this synchronisation vary between operation systems.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void sync_data()
+  {
+    boost::system::error_code ec;
+    impl_.get_service().sync_data(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "sync_data");
+  }
+
+  /// Synchronise the file data to disk.
+  /**
+   * This function synchronises the file data to disk. Note that the semantics
+   * of this synchronisation vary between operation systems.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID sync_data(boost::system::error_code& ec)
+  {
+    impl_.get_service().sync_data(impl_.get_implementation(), ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  /**
+   * This function destroys the file, cancelling any outstanding asynchronous
+   * operations associated with the file as if by calling @c cancel.
+   */
+  ~basic_file()
+  {
+  }
+
+#if defined(BOOST_ASIO_HAS_IOCP)
+  detail::io_object_impl<detail::win_iocp_file_service, Executor> impl_;
+#elif defined(BOOST_ASIO_HAS_IO_URING)
+  detail::io_object_impl<detail::io_uring_file_service, Executor> impl_;
+#endif
+
+private:
+  // Disallow copying and assignment.
+  basic_file(const basic_file&) BOOST_ASIO_DELETED;
+  basic_file& operator=(const basic_file&) BOOST_ASIO_DELETED;
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_ASIO_HAS_FILE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#endif // BOOST_ASIO_BASIC_FILE_HPP

sources/boost/asio/basic_io_object.hpp

@@ -2,7 +2,7 @@
 // basic_io_object.hpp
 // ~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/basic_random_access_file.hpp

@@ -0,0 +1,679 @@
+//
+// basic_random_access_file.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_BASIC_RANDOM_ACCESS_FILE_HPP
+#define BOOST_ASIO_BASIC_RANDOM_ACCESS_FILE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_FILE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#include <cstddef>
+#include <boost/asio/async_result.hpp>
+#include <boost/asio/basic_file.hpp>
+#include <boost/asio/detail/handler_type_requirements.hpp>
+#include <boost/asio/detail/non_const_lvalue.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+#include <boost/asio/error.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+#if !defined(BOOST_ASIO_BASIC_RANDOM_ACCESS_FILE_FWD_DECL)
+#define BOOST_ASIO_BASIC_RANDOM_ACCESS_FILE_FWD_DECL
+
+// Forward declaration with defaulted arguments.
+template <typename Executor = any_io_executor>
+class basic_random_access_file;
+
+#endif // !defined(BOOST_ASIO_BASIC_RANDOM_ACCESS_FILE_FWD_DECL)
+
+/// Provides random-access file functionality.
+/**
+ * The basic_random_access_file class template provides asynchronous and
+ * blocking random-access file functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * Synchronous @c read_some_at and @c write_some_at operations are thread safe
+ * with respect to each other, if the underlying operating system calls are
+ * also thread safe. This means that it is permitted to perform concurrent
+ * calls to these synchronous operations on a single file object. Other
+ * synchronous operations, such as @c open or @c close, are not thread safe.
+ */
+template <typename Executor>
+class basic_random_access_file
+  : public basic_file<Executor>
+{
+public:
+  /// The type of the executor associated with the object.
+  typedef Executor executor_type;
+
+  /// Rebinds the file type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The file type when rebound to the specified executor.
+    typedef basic_random_access_file<Executor1> other;
+  };
+
+  /// The native representation of a file.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_handle_type;
+#else
+  typedef typename basic_file<Executor>::native_handle_type native_handle_type;
+#endif
+
+  /// Construct a basic_random_access_file without opening it.
+  /**
+   * This constructor initialises a file without opening it. The file needs to
+   * be opened before data can be read from or or written to it.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   */
+  explicit basic_random_access_file(const executor_type& ex)
+    : basic_file<Executor>(ex)
+  {
+  }
+
+  /// Construct a basic_random_access_file without opening it.
+  /**
+   * This constructor initialises a file without opening it. The file needs to
+   * be opened before data can be read from or or written to it.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   */
+  template <typename ExecutionContext>
+  explicit basic_random_access_file(ExecutionContext& context,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(context)
+  {
+  }
+
+  /// Construct and open a basic_random_access_file.
+  /**
+   * This constructor initialises and opens a file.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_random_access_file(const executor_type& ex,
+      const char* path, file_base::flags open_flags)
+    : basic_file<Executor>(ex, path, open_flags)
+  {
+  }
+
+  /// Construct and open a basic_random_access_file.
+  /**
+   * This constructor initialises and opens a file.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_random_access_file(ExecutionContext& context,
+      const char* path, file_base::flags open_flags,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(context, path, open_flags)
+  {
+  }
+
+  /// Construct and open a basic_random_access_file.
+  /**
+   * This constructor initialises and opens a file.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_random_access_file(const executor_type& ex,
+      const std::string& path, file_base::flags open_flags)
+    : basic_file<Executor>(ex, path, open_flags)
+  {
+  }
+
+  /// Construct and open a basic_random_access_file.
+  /**
+   * This constructor initialises and opens a file.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_random_access_file(ExecutionContext& context,
+      const std::string& path, file_base::flags open_flags,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(context, path, open_flags)
+  {
+  }
+
+  /// Construct a basic_random_access_file on an existing native file.
+  /**
+   * This constructor initialises a random-access file object to hold an
+   * existing native file.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param native_file The new underlying file implementation.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_random_access_file(const executor_type& ex,
+      const native_handle_type& native_file)
+    : basic_file<Executor>(ex, native_file)
+  {
+  }
+
+  /// Construct a basic_random_access_file on an existing native file.
+  /**
+   * This constructor initialises a random-access file object to hold an
+   * existing native file.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param native_file The new underlying file implementation.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_random_access_file(ExecutionContext& context,
+      const native_handle_type& native_file,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(context, native_file)
+  {
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move-construct a basic_random_access_file from another.
+  /**
+   * This constructor moves a random-access file from one object to another.
+   *
+   * @param other The other basic_random_access_file object from which the move
+   * will occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_random_access_file(const executor_type&)
+   * constructor.
+   */
+  basic_random_access_file(basic_random_access_file&& other) BOOST_ASIO_NOEXCEPT
+    : basic_file<Executor>(std::move(other))
+  {
+  }
+
+  /// Move-assign a basic_random_access_file from another.
+  /**
+   * This assignment operator moves a random-access file from one object to
+   * another.
+   *
+   * @param other The other basic_random_access_file object from which the move
+   * will occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_random_access_file(const executor_type&)
+   * constructor.
+   */
+  basic_random_access_file& operator=(basic_random_access_file&& other)
+  {
+    basic_file<Executor>::operator=(std::move(other));
+    return *this;
+  }
+
+  /// Move-construct a basic_random_access_file from a file of another executor
+  /// type.
+  /**
+   * This constructor moves a random-access file from one object to another.
+   *
+   * @param other The other basic_random_access_file object from which the move
+   * will occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_random_access_file(const executor_type&)
+   * constructor.
+   */
+  template <typename Executor1>
+  basic_random_access_file(basic_random_access_file<Executor1>&& other,
+      typename constraint<
+        is_convertible<Executor1, Executor>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(std::move(other))
+  {
+  }
+
+  /// Move-assign a basic_random_access_file from a file of another executor
+  /// type.
+  /**
+   * This assignment operator moves a random-access file from one object to
+   * another.
+   *
+   * @param other The other basic_random_access_file object from which the move
+   * will occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_random_access_file(const executor_type&)
+   * constructor.
+   */
+  template <typename Executor1>
+  typename constraint<
+    is_convertible<Executor1, Executor>::value,
+    basic_random_access_file&
+  >::type operator=(basic_random_access_file<Executor1>&& other)
+  {
+    basic_file<Executor>::operator=(std::move(other));
+    return *this;
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Destroys the file.
+  /**
+   * This function destroys the file, cancelling any outstanding asynchronous
+   * operations associated with the file as if by calling @c cancel.
+   */
+  ~basic_random_access_file()
+  {
+  }
+
+  /// Write some data to the handle at the specified offset.
+  /**
+   * This function is used to write data to the random-access handle. The
+   * function call will block until one or more bytes of the data has been
+   * written successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws boost::system::system_error Thrown on failure. An error code of
+   * boost::asio::error::eof indicates that the end of the file was reached.
+   *
+   * @note The write_some_at operation may not write all of the data. Consider
+   * using the @ref write_at function if you need to ensure that all data is
+   * written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.write_some_at(42, boost::asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some_at(uint64_t offset,
+      const ConstBufferSequence& buffers)
+  {
+    boost::system::error_code ec;
+    std::size_t s = this->impl_.get_service().write_some_at(
+        this->impl_.get_implementation(), offset, buffers, ec);
+    boost::asio::detail::throw_error(ec, "write_some_at");
+    return s;
+  }
+
+  /// Write some data to the handle at the specified offset.
+  /**
+   * This function is used to write data to the random-access handle. The
+   * function call will block until one or more bytes of the data has been
+   * written successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not write all of the data to the
+   * file. Consider using the @ref write_at function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some_at(uint64_t offset,
+      const ConstBufferSequence& buffers, boost::system::error_code& ec)
+  {
+    return this->impl_.get_service().write_some_at(
+        this->impl_.get_implementation(), offset, buffers, ec);
+  }
+
+  /// Start an asynchronous write at the specified offset.
+  /**
+   * This function is used to asynchronously write data to the random-access
+   * handle. The function call always returns immediately.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const boost::system::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. On
+   * immediate completion, invocation of the handler will be performed in a
+   * manner equivalent to using boost::asio::post().
+   *
+   * @note The write operation may not write all of the data to the file.
+   * Consider using the @ref async_write_at function if you need to ensure that
+   * all data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.async_write_some_at(42, boost::asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * This asynchronous operation supports cancellation for the following
+   * boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
+   */
+  template <typename ConstBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) WriteHandler
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(WriteHandler,
+      void (boost::system::error_code, std::size_t))
+  async_write_some_at(uint64_t offset,
+      const ConstBufferSequence& buffers,
+      BOOST_ASIO_MOVE_ARG(WriteHandler) handler
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+  {
+    return async_initiate<WriteHandler,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_write_some_at(this), handler, offset, buffers);
+  }
+
+  /// Read some data from the handle at the specified offset.
+  /**
+   * This function is used to read data from the random-access handle. The
+   * function call will block until one or more bytes of data has been read
+   * successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws boost::system::system_error Thrown on failure. An error code of
+   * boost::asio::error::eof indicates that the end of the file was reached.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read_at function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.read_some_at(42, boost::asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some_at(uint64_t offset,
+      const MutableBufferSequence& buffers)
+  {
+    boost::system::error_code ec;
+    std::size_t s = this->impl_.get_service().read_some_at(
+        this->impl_.get_implementation(), offset, buffers, ec);
+    boost::asio::detail::throw_error(ec, "read_some_at");
+    return s;
+  }
+
+  /// Read some data from the handle at the specified offset.
+  /**
+   * This function is used to read data from the random-access handle. The
+   * function call will block until one or more bytes of data has been read
+   * successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read_at function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some_at(uint64_t offset,
+      const MutableBufferSequence& buffers, boost::system::error_code& ec)
+  {
+    return this->impl_.get_service().read_some_at(
+        this->impl_.get_implementation(), offset, buffers, ec);
+  }
+
+  /// Start an asynchronous read at the specified offset.
+  /**
+   * This function is used to asynchronously read data from the random-access
+   * handle. The function call always returns immediately.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const boost::system::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. On
+   * immediate completion, invocation of the handler will be performed in a
+   * manner equivalent to using boost::asio::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read_at function if you need to ensure that
+   * the requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.async_read_some_at(42, boost::asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * This asynchronous operation supports cancellation for the following
+   * boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
+   */
+  template <typename MutableBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) ReadHandler
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+      void (boost::system::error_code, std::size_t))
+  async_read_some_at(uint64_t offset,
+      const MutableBufferSequence& buffers,
+      BOOST_ASIO_MOVE_ARG(ReadHandler) handler
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+  {
+    return async_initiate<ReadHandler,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_read_some_at(this), handler, offset, buffers);
+  }
+
+private:
+  // Disallow copying and assignment.
+  basic_random_access_file(const basic_random_access_file&) BOOST_ASIO_DELETED;
+  basic_random_access_file& operator=(
+      const basic_random_access_file&) BOOST_ASIO_DELETED;
+
+  class initiate_async_write_some_at
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_write_some_at(basic_random_access_file* self)
+      : self_(self)
+    {
+    }
+
+    executor_type get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename WriteHandler, typename ConstBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(WriteHandler) handler,
+        uint64_t offset, const ConstBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a WriteHandler.
+      BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
+
+      detail::non_const_lvalue<WriteHandler> handler2(handler);
+      self_->impl_.get_service().async_write_some_at(
+          self_->impl_.get_implementation(), offset, buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_random_access_file* self_;
+  };
+
+  class initiate_async_read_some_at
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_read_some_at(basic_random_access_file* self)
+      : self_(self)
+    {
+    }
+
+    executor_type get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename ReadHandler, typename MutableBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(ReadHandler) handler,
+        uint64_t offset, const MutableBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a ReadHandler.
+      BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+      detail::non_const_lvalue<ReadHandler> handler2(handler);
+      self_->impl_.get_service().async_read_some_at(
+          self_->impl_.get_implementation(), offset, buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_random_access_file* self_;
+  };
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_ASIO_HAS_FILE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#endif // BOOST_ASIO_BASIC_RANDOM_ACCESS_FILE_HPP

sources/boost/asio/basic_raw_socket.hpp

@@ -2,7 +2,7 @@
 // basic_raw_socket.hpp
 // ~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -46,6 +46,13 @@ class basic_raw_socket;
  * @par Thread Safety
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
+ *
+ * Synchronous @c send, @c send_to, @c receive, @c receive_from, and @c connect
+ * operations are thread safe with respect to each other, if the underlying
+ * operating system calls are also thread safe. This means that it is permitted
+ * to perform concurrent calls to these synchronous operations on a single
+ * socket object. Other synchronous operations, such as @c open or @c close, are
+ * not thread safe.
  */
 template <typename Protocol, typename Executor>
 class basic_raw_socket
@@ -101,9 +108,9 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_raw_socket(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context)
   {
   }
@@ -138,9 +145,10 @@ public:
    */
   template <typename ExecutionContext>
   basic_raw_socket(ExecutionContext& context, const protocol_type& protocol,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
+      >::type = defaulted_constraint())
     : basic_socket<Protocol, Executor>(context, protocol)
   {
   }
@@ -183,9 +191,9 @@ public:
    */
   template <typename ExecutionContext>
   basic_raw_socket(ExecutionContext& context, const endpoint_type& endpoint,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context, endpoint)
   {
   }
@@ -228,9 +236,9 @@ public:
   template <typename ExecutionContext>
   basic_raw_socket(ExecutionContext& context,
       const protocol_type& protocol, const native_handle_type& native_socket,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context, protocol, native_socket)
   {
   }
@@ -283,10 +291,10 @@ public:
    */
   template <typename Protocol1, typename Executor1>
   basic_raw_socket(basic_raw_socket<Protocol1, Executor1>&& other,
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol1, Protocol>::value
           && is_convertible<Executor1, Executor>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(std::move(other))
   {
   }
@@ -303,7 +311,7 @@ public:
    * constructor.
    */
   template <typename Protocol1, typename Executor1>
-  typename enable_if<
+  typename constraint<
     is_convertible<Protocol1, Protocol>::value
       && is_convertible<Executor1, Executor>::value,
     basic_raw_socket&
@@ -439,6 +447,16 @@ public:
    * See the @ref buffer documentation for information on sending multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -483,6 +501,16 @@ public:
    * @note The async_send operation can only be used with a connected socket.
    * Use the async_send_to function to send data on an unconnected raw
    * socket.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -624,6 +652,16 @@ public:
    * See the @ref buffer documentation for information on sending multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -668,6 +706,16 @@ public:
    * not, the handler will not be invoked from within this function. On
    * immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -809,6 +857,16 @@ public:
    * See the @ref buffer documentation for information on receiving into
    * multiple buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -853,6 +911,16 @@ public:
    * @note The async_receive operation can only be used with a connected socket.
    * Use the async_receive_from function to receive data on an unconnected
    * raw socket.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -994,6 +1062,16 @@ public:
    * See the @ref buffer documentation for information on receiving into
    * multiple buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -1040,6 +1118,16 @@ public:
    * not, the handler will not be invoked from within this function. On
    * immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,

sources/boost/asio/basic_readable_pipe.hpp

@@ -0,0 +1,525 @@
+//
+// basic_readable_pipe.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_BASIC_READABLE_PIPE_HPP
+#define BOOST_ASIO_BASIC_READABLE_PIPE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_PIPE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#include <string>
+#include <boost/asio/any_io_executor.hpp>
+#include <boost/asio/async_result.hpp>
+#include <boost/asio/detail/handler_type_requirements.hpp>
+#include <boost/asio/detail/io_object_impl.hpp>
+#include <boost/asio/detail/non_const_lvalue.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/error.hpp>
+#include <boost/asio/execution_context.hpp>
+#if defined(BOOST_ASIO_HAS_IOCP)
+# include <boost/asio/detail/win_iocp_handle_service.hpp>
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+# include <boost/asio/detail/io_uring_descriptor_service.hpp>
+#else
+# include <boost/asio/detail/reactive_descriptor_service.hpp>
+#endif
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+# include <utility>
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+/// Provides pipe functionality.
+/**
+ * The basic_readable_pipe class provides a wrapper over pipe
+ * functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename Executor = any_io_executor>
+class basic_readable_pipe
+{
+public:
+  /// The type of the executor associated with the object.
+  typedef Executor executor_type;
+
+  /// Rebinds the pipe type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The pipe type when rebound to the specified executor.
+    typedef basic_readable_pipe<Executor1> other;
+  };
+
+  /// The native representation of a pipe.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_handle_type;
+#elif defined(BOOST_ASIO_HAS_IOCP)
+  typedef detail::win_iocp_handle_service::native_handle_type
+    native_handle_type;
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+  typedef detail::io_uring_descriptor_service::native_handle_type
+    native_handle_type;
+#else
+  typedef detail::reactive_descriptor_service::native_handle_type
+    native_handle_type;
+#endif
+
+  /// A basic_readable_pipe is always the lowest layer.
+  typedef basic_readable_pipe lowest_layer_type;
+
+  /// Construct a basic_readable_pipe without opening it.
+  /**
+   * This constructor creates a pipe without opening it.
+   *
+   * @param ex The I/O executor that the pipe will use, by default, to dispatch
+   * handlers for any asynchronous operations performed on the pipe.
+   */
+  explicit basic_readable_pipe(const executor_type& ex)
+    : impl_(0, ex)
+  {
+  }
+
+  /// Construct a basic_readable_pipe without opening it.
+  /**
+   * This constructor creates a pipe without opening it.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the pipe will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the pipe.
+   */
+  template <typename ExecutionContext>
+  explicit basic_readable_pipe(ExecutionContext& context,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
+  {
+  }
+
+  /// Construct a basic_readable_pipe on an existing native pipe.
+  /**
+   * This constructor creates a pipe object to hold an existing native
+   * pipe.
+   *
+   * @param ex The I/O executor that the pipe will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the
+   * pipe.
+   *
+   * @param native_pipe A native pipe.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_readable_pipe(const executor_type& ex,
+      const native_handle_type& native_pipe)
+    : impl_(0, ex)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(impl_.get_implementation(),
+        native_pipe, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+  /// Construct a basic_readable_pipe on an existing native pipe.
+  /**
+   * This constructor creates a pipe object to hold an existing native
+   * pipe.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the pipe will use, by default, to dispatch handlers for any
+   * asynchronous operations performed on the pipe.
+   *
+   * @param native_pipe A native pipe.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_readable_pipe(ExecutionContext& context,
+      const native_handle_type& native_pipe,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value
+      >::type = 0)
+    : impl_(0, 0, context)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(impl_.get_implementation(),
+        native_pipe, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move-construct a basic_readable_pipe from another.
+  /**
+   * This constructor moves a pipe from one object to another.
+   *
+   * @param other The other basic_readable_pipe object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_readable_pipe(const executor_type&)
+   * constructor.
+   */
+  basic_readable_pipe(basic_readable_pipe&& other)
+    : impl_(std::move(other.impl_))
+  {
+  }
+
+  /// Move-assign a basic_readable_pipe from another.
+  /**
+   * This assignment operator moves a pipe from one object to another.
+   *
+   * @param other The other basic_readable_pipe object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_readable_pipe(const executor_type&)
+   * constructor.
+   */
+  basic_readable_pipe& operator=(basic_readable_pipe&& other)
+  {
+    impl_ = std::move(other.impl_);
+    return *this;
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Destroys the pipe.
+  /**
+   * This function destroys the pipe, cancelling any outstanding
+   * asynchronous wait operations associated with the pipe as if by
+   * calling @c cancel.
+   */
+  ~basic_readable_pipe()
+  {
+  }
+
+  /// Get the executor associated with the object.
+  executor_type get_executor() BOOST_ASIO_NOEXCEPT
+  {
+    return impl_.get_executor();
+  }
+
+  /// Get a reference to the lowest layer.
+  /**
+   * This function returns a reference to the lowest layer in a stack of
+   * layers. Since a basic_readable_pipe cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A reference to the lowest layer in the stack of layers. Ownership
+   * is not transferred to the caller.
+   */
+  lowest_layer_type& lowest_layer()
+  {
+    return *this;
+  }
+
+  /// Get a const reference to the lowest layer.
+  /**
+   * This function returns a const reference to the lowest layer in a stack of
+   * layers. Since a basic_readable_pipe cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A const reference to the lowest layer in the stack of layers.
+   * Ownership is not transferred to the caller.
+   */
+  const lowest_layer_type& lowest_layer() const
+  {
+    return *this;
+  }
+
+  /// Assign an existing native pipe to the pipe.
+  /*
+   * This function opens the pipe to hold an existing native pipe.
+   *
+   * @param native_pipe A native pipe.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void assign(const native_handle_type& native_pipe)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(impl_.get_implementation(), native_pipe, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+  /// Assign an existing native pipe to the pipe.
+  /*
+   * This function opens the pipe to hold an existing native pipe.
+   *
+   * @param native_pipe A native pipe.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID assign(const native_handle_type& native_pipe,
+      boost::system::error_code& ec)
+  {
+    impl_.get_service().assign(impl_.get_implementation(), native_pipe, ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Determine whether the pipe is open.
+  bool is_open() const
+  {
+    return impl_.get_service().is_open(impl_.get_implementation());
+  }
+
+  /// Close the pipe.
+  /**
+   * This function is used to close the pipe. Any asynchronous read operations
+   * will be cancelled immediately, and will complete with the
+   * boost::asio::error::operation_aborted error.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void close()
+  {
+    boost::system::error_code ec;
+    impl_.get_service().close(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "close");
+  }
+
+  /// Close the pipe.
+  /**
+   * This function is used to close the pipe. Any asynchronous read operations
+   * will be cancelled immediately, and will complete with the
+   * boost::asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID close(boost::system::error_code& ec)
+  {
+    impl_.get_service().close(impl_.get_implementation(), ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Get the native pipe representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * pipe. This is intended to allow access to native pipe
+   * functionality that is not otherwise provided.
+   */
+  native_handle_type native_handle()
+  {
+    return impl_.get_service().native_handle(impl_.get_implementation());
+  }
+
+  /// Cancel all asynchronous operations associated with the pipe.
+  /**
+   * This function causes all outstanding asynchronous read operations to finish
+   * immediately, and the handlers for cancelled operations will be passed the
+   * boost::asio::error::operation_aborted error.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void cancel()
+  {
+    boost::system::error_code ec;
+    impl_.get_service().cancel(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "cancel");
+  }
+
+  /// Cancel all asynchronous operations associated with the pipe.
+  /**
+   * This function causes all outstanding asynchronous read operations to finish
+   * immediately, and the handlers for cancelled operations will be passed the
+   * boost::asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID cancel(boost::system::error_code& ec)
+  {
+    impl_.get_service().cancel(impl_.get_implementation(), ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Read some data from the pipe.
+  /**
+   * This function is used to read data from the pipe. The function call will
+   * block until one or more bytes of data has been read successfully, or until
+   * an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws boost::system::system_error Thrown on failure. An error code of
+   * boost::asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * basic_readable_pipe.read_some(boost::asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    boost::system::error_code ec;
+    std::size_t s = impl_.get_service().read_some(
+        impl_.get_implementation(), buffers, ec);
+    boost::asio::detail::throw_error(ec, "read_some");
+    return s;
+  }
+
+  /// Read some data from the pipe.
+  /**
+   * This function is used to read data from the pipe. The function call will
+   * block until one or more bytes of data has been read successfully, or until
+   * an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      boost::system::error_code& ec)
+  {
+    return impl_.get_service().read_some(
+        impl_.get_implementation(), buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  /**
+   * This function is used to asynchronously read data from the pipe. The
+   * function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const boost::system::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. On
+   * immediate completion, invocation of the handler will be performed in a
+   * manner equivalent to using boost::asio::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read function if you need to ensure that the
+   * requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * basic_readable_pipe.async_read_some(
+   *     boost::asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) ReadHandler
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+      void (boost::system::error_code, std::size_t))
+  async_read_some(const MutableBufferSequence& buffers,
+      BOOST_ASIO_MOVE_ARG(ReadHandler) handler
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+  {
+    return async_initiate<ReadHandler,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_read_some(this), handler, buffers);
+  }
+
+private:
+  // Disallow copying and assignment.
+  basic_readable_pipe(const basic_readable_pipe&) BOOST_ASIO_DELETED;
+  basic_readable_pipe& operator=(const basic_readable_pipe&) BOOST_ASIO_DELETED;
+
+  class initiate_async_read_some
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_read_some(basic_readable_pipe* self)
+      : self_(self)
+    {
+    }
+
+    executor_type get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename ReadHandler, typename MutableBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(ReadHandler) handler,
+        const MutableBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a ReadHandler.
+      BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+      detail::non_const_lvalue<ReadHandler> handler2(handler);
+      self_->impl_.get_service().async_read_some(
+          self_->impl_.get_implementation(), buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_readable_pipe* self_;
+  };
+
+#if defined(BOOST_ASIO_HAS_IOCP)
+  detail::io_object_impl<detail::win_iocp_handle_service, Executor> impl_;
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+  detail::io_object_impl<detail::io_uring_descriptor_service, Executor> impl_;
+#else
+  detail::io_object_impl<detail::reactive_descriptor_service, Executor> impl_;
+#endif
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_ASIO_HAS_PIPE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#endif // BOOST_ASIO_BASIC_READABLE_PIPE_HPP

sources/boost/asio/basic_seq_packet_socket.hpp

@@ -2,7 +2,7 @@
 // basic_seq_packet_socket.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -44,6 +44,12 @@ class basic_seq_packet_socket;
  * @par Thread Safety
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
+ *
+ * Synchronous @c send, @c receive, and @c connect operations are thread safe
+ * with respect to each other, if the underlying operating system calls are
+ * also thread safe. This means that it is permitted to perform concurrent
+ * calls to these synchronous operations on a single socket object. Other
+ * synchronous operations, such as @c open or @c close, are not thread safe.
  */
 template <typename Protocol, typename Executor>
 class basic_seq_packet_socket
@@ -101,9 +107,9 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_seq_packet_socket(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context)
   {
   }
@@ -144,9 +150,10 @@ public:
   template <typename ExecutionContext>
   basic_seq_packet_socket(ExecutionContext& context,
       const protocol_type& protocol,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
+      >::type = defaulted_constraint())
     : basic_socket<Protocol, Executor>(context, protocol)
   {
   }
@@ -191,9 +198,9 @@ public:
   template <typename ExecutionContext>
   basic_seq_packet_socket(ExecutionContext& context,
       const endpoint_type& endpoint,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context, endpoint)
   {
   }
@@ -236,9 +243,9 @@ public:
   template <typename ExecutionContext>
   basic_seq_packet_socket(ExecutionContext& context,
       const protocol_type& protocol, const native_handle_type& native_socket,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context, protocol, native_socket)
   {
   }
@@ -294,10 +301,10 @@ public:
    */
   template <typename Protocol1, typename Executor1>
   basic_seq_packet_socket(basic_seq_packet_socket<Protocol1, Executor1>&& other,
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol1, Protocol>::value
           && is_convertible<Executor1, Executor>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(std::move(other))
   {
   }
@@ -316,7 +323,7 @@ public:
    * constructor.
    */
   template <typename Protocol1, typename Executor1>
-  typename enable_if<
+  typename constraint<
     is_convertible<Protocol1, Protocol>::value
       && is_convertible<Executor1, Executor>::value,
     basic_seq_packet_socket&
@@ -428,6 +435,16 @@ public:
    * See the @ref buffer documentation for information on sending multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -601,6 +618,16 @@ public:
    * See the @ref buffer documentation for information on receiving into
    * multiple buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -660,6 +687,16 @@ public:
    * See the @ref buffer documentation for information on receiving into
    * multiple buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,

sources/boost/asio/basic_serial_port.hpp

@@ -2,7 +2,7 @@
 // basic_serial_port.hpp
 // ~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 // Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -35,7 +35,7 @@
 #if defined(BOOST_ASIO_HAS_IOCP)
 # include <boost/asio/detail/win_iocp_serial_port_service.hpp>
 #else
-# include <boost/asio/detail/reactive_serial_port_service.hpp>
+# include <boost/asio/detail/posix_serial_port_service.hpp>
 #endif
 
 #if defined(BOOST_ASIO_HAS_MOVE)
@@ -79,7 +79,7 @@ public:
   typedef detail::win_iocp_serial_port_service::native_handle_type
     native_handle_type;
 #else
-  typedef detail::reactive_serial_port_service::native_handle_type
+  typedef detail::posix_serial_port_service::native_handle_type
     native_handle_type;
 #endif
 
@@ -95,7 +95,7 @@ public:
    * serial port.
    */
   explicit basic_serial_port(const executor_type& ex)
-    : impl_(ex)
+    : impl_(0, ex)
   {
   }
 
@@ -109,11 +109,11 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_serial_port(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value,
-        basic_serial_port
+        defaulted_constraint
-      >::type* = 0)
+      >::type = defaulted_constraint())
-    : impl_(context)
+    : impl_(0, 0, context)
   {
   }
 
@@ -130,7 +130,7 @@ public:
    * port.
    */
   basic_serial_port(const executor_type& ex, const char* device)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), device, ec);
@@ -151,10 +151,10 @@ public:
    */
   template <typename ExecutionContext>
   basic_serial_port(ExecutionContext& context, const char* device,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), device, ec);
@@ -174,7 +174,7 @@ public:
    * port.
    */
   basic_serial_port(const executor_type& ex, const std::string& device)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), device, ec);
@@ -195,10 +195,10 @@ public:
    */
   template <typename ExecutionContext>
   basic_serial_port(ExecutionContext& context, const std::string& device,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), device, ec);
@@ -220,7 +220,7 @@ public:
    */
   basic_serial_port(const executor_type& ex,
       const native_handle_type& native_serial_port)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
@@ -244,10 +244,10 @@ public:
   template <typename ExecutionContext>
   basic_serial_port(ExecutionContext& context,
       const native_handle_type& native_serial_port,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
@@ -894,7 +894,7 @@ private:
 #if defined(BOOST_ASIO_HAS_IOCP)
   detail::io_object_impl<detail::win_iocp_serial_port_service, Executor> impl_;
 #else
-  detail::io_object_impl<detail::reactive_serial_port_service, Executor> impl_;
+  detail::io_object_impl<detail::posix_serial_port_service, Executor> impl_;
 #endif
 };
 

sources/boost/asio/basic_signal_set.hpp

@@ -2,7 +2,7 @@
 // basic_signal_set.hpp
 // ~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -28,6 +28,8 @@
 #include <boost/asio/error.hpp>
 #include <boost/asio/execution_context.hpp>
 
+#include <boost/asio/detail/push_options.hpp>
+
 namespace boost {
 namespace asio {
 
@@ -115,7 +117,7 @@ public:
    * signal set.
    */
   explicit basic_signal_set(const executor_type& ex)
-    : impl_(ex)
+    : impl_(0, ex)
   {
   }
 
@@ -129,10 +131,11 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_signal_set(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
-    : impl_(context)
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
   {
   }
 
@@ -151,7 +154,7 @@ public:
    * signals.add(signal_number_1); @endcode
    */
   basic_signal_set(const executor_type& ex, int signal_number_1)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().add(impl_.get_implementation(), signal_number_1, ec);
@@ -174,10 +177,11 @@ public:
    */
   template <typename ExecutionContext>
   basic_signal_set(ExecutionContext& context, int signal_number_1,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
-    : impl_(context)
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().add(impl_.get_implementation(), signal_number_1, ec);
@@ -203,7 +207,7 @@ public:
    */
   basic_signal_set(const executor_type& ex, int signal_number_1,
       int signal_number_2)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().add(impl_.get_implementation(), signal_number_1, ec);
@@ -232,10 +236,11 @@ public:
   template <typename ExecutionContext>
   basic_signal_set(ExecutionContext& context, int signal_number_1,
       int signal_number_2,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
-    : impl_(context)
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().add(impl_.get_implementation(), signal_number_1, ec);
@@ -266,7 +271,7 @@ public:
    */
   basic_signal_set(const executor_type& ex, int signal_number_1,
       int signal_number_2, int signal_number_3)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().add(impl_.get_implementation(), signal_number_1, ec);
@@ -300,10 +305,11 @@ public:
   template <typename ExecutionContext>
   basic_signal_set(ExecutionContext& context, int signal_number_1,
       int signal_number_2, int signal_number_3,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
-    : impl_(context)
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().add(impl_.get_implementation(), signal_number_1, ec);
@@ -567,4 +573,6 @@ private:
 } // namespace asio
 } // namespace boost
 
+#include <boost/asio/detail/pop_options.hpp>
+
 #endif // BOOST_ASIO_BASIC_SIGNAL_SET_HPP

sources/boost/asio/basic_socket.hpp

@@ -2,7 +2,7 @@
 // basic_socket.hpp
 // ~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -32,6 +32,8 @@
 # include <boost/asio/detail/null_socket_service.hpp>
 #elif defined(BOOST_ASIO_HAS_IOCP)
 # include <boost/asio/detail/win_iocp_socket_service.hpp>
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+# include <boost/asio/detail/io_uring_socket_service.hpp>
 #else
 # include <boost/asio/detail/reactive_socket_service.hpp>
 #endif
@@ -88,6 +90,9 @@ public:
 #elif defined(BOOST_ASIO_HAS_IOCP)
   typedef typename detail::win_iocp_socket_service<
     Protocol>::native_handle_type native_handle_type;
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+  typedef typename detail::io_uring_socket_service<
+    Protocol>::native_handle_type native_handle_type;
 #else
   typedef typename detail::reactive_socket_service<
     Protocol>::native_handle_type native_handle_type;
@@ -112,7 +117,7 @@ public:
    * dispatch handlers for any asynchronous operations performed on the socket.
    */
   explicit basic_socket(const executor_type& ex)
-    : impl_(ex)
+    : impl_(0, ex)
   {
   }
 
@@ -126,10 +131,10 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_socket(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
   }
 
@@ -145,7 +150,7 @@ public:
    * @throws boost::system::system_error Thrown on failure.
    */
   basic_socket(const executor_type& ex, const protocol_type& protocol)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), protocol, ec);
@@ -166,10 +171,11 @@ public:
    */
   template <typename ExecutionContext>
   basic_socket(ExecutionContext& context, const protocol_type& protocol,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
-    : impl_(context)
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), protocol, ec);
@@ -192,7 +198,7 @@ public:
    * @throws boost::system::system_error Thrown on failure.
    */
   basic_socket(const executor_type& ex, const endpoint_type& endpoint)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     const protocol_type protocol = endpoint.protocol();
@@ -220,10 +226,10 @@ public:
    */
   template <typename ExecutionContext>
   basic_socket(ExecutionContext& context, const endpoint_type& endpoint,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     const protocol_type protocol = endpoint.protocol();
@@ -248,7 +254,7 @@ public:
    */
   basic_socket(const executor_type& ex, const protocol_type& protocol,
       const native_handle_type& native_socket)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
@@ -273,10 +279,10 @@ public:
   template <typename ExecutionContext>
   basic_socket(ExecutionContext& context, const protocol_type& protocol,
       const native_handle_type& native_socket,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
@@ -332,10 +338,10 @@ public:
    */
   template <typename Protocol1, typename Executor1>
   basic_socket(basic_socket<Protocol1, Executor1>&& other,
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol1, Protocol>::value
           && is_convertible<Executor1, Executor>::value
-      >::type* = 0)
+      >::type = 0)
     : impl_(std::move(other.impl_))
   {
   }
@@ -351,7 +357,7 @@ public:
    * constructed using the @c basic_socket(const executor_type&) constructor.
    */
   template <typename Protocol1, typename Executor1>
-  typename enable_if<
+  typename constraint<
     is_convertible<Protocol1, Protocol>::value
       && is_convertible<Executor1, Executor>::value,
     basic_socket&
@@ -939,6 +945,16 @@ public:
    *     boost::asio::ip::address::from_string("1.2.3.4"), 12345);
    * socket.async_connect(endpoint, connect_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))
@@ -1772,6 +1788,16 @@ public:
    * ...
    * socket.async_wait(boost::asio::ip::tcp::socket::wait_read, wait_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))
@@ -1802,6 +1828,9 @@ protected:
 #elif defined(BOOST_ASIO_HAS_IOCP)
   detail::io_object_impl<
     detail::win_iocp_socket_service<Protocol>, Executor> impl_;
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+  detail::io_object_impl<
+    detail::io_uring_socket_service<Protocol>, Executor> impl_;
 #else
   detail::io_object_impl<
     detail::reactive_socket_service<Protocol>, Executor> impl_;

sources/boost/asio/basic_socket_acceptor.hpp

@@ -2,7 +2,7 @@
 // basic_socket_acceptor.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -31,6 +31,8 @@
 # include <boost/asio/detail/null_socket_service.hpp>
 #elif defined(BOOST_ASIO_HAS_IOCP)
 # include <boost/asio/detail/win_iocp_socket_service.hpp>
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+# include <boost/asio/detail/io_uring_socket_service.hpp>
 #else
 # include <boost/asio/detail/reactive_socket_service.hpp>
 #endif
@@ -62,6 +64,12 @@ class basic_socket_acceptor;
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  *
+ * Synchronous @c accept operations are thread safe, if the underlying
+ * operating system calls are also thread safe. This means that it is permitted
+ * to perform concurrent calls to synchronous @c accept operations on a single
+ * socket object. Other synchronous operations, such as @c open or @c close, are
+ * not thread safe.
+ *
  * @par Example
  * Opening a socket acceptor with the SO_REUSEADDR option enabled:
  * @code
@@ -98,6 +106,9 @@ public:
 #elif defined(BOOST_ASIO_HAS_IOCP)
   typedef typename detail::win_iocp_socket_service<
     Protocol>::native_handle_type native_handle_type;
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+  typedef typename detail::io_uring_socket_service<
+    Protocol>::native_handle_type native_handle_type;
 #else
   typedef typename detail::reactive_socket_service<
     Protocol>::native_handle_type native_handle_type;
@@ -120,7 +131,7 @@ public:
    * acceptor.
    */
   explicit basic_socket_acceptor(const executor_type& ex)
-    : impl_(ex)
+    : impl_(0, ex)
   {
   }
 
@@ -136,10 +147,10 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_socket_acceptor(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
   }
 
@@ -156,7 +167,7 @@ public:
    * @throws boost::system::system_error Thrown on failure.
    */
   basic_socket_acceptor(const executor_type& ex, const protocol_type& protocol)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), protocol, ec);
@@ -178,10 +189,11 @@ public:
   template <typename ExecutionContext>
   basic_socket_acceptor(ExecutionContext& context,
       const protocol_type& protocol,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
-    : impl_(context)
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), protocol, ec);
@@ -217,7 +229,7 @@ public:
    */
   basic_socket_acceptor(const executor_type& ex,
       const endpoint_type& endpoint, bool reuse_addr = true)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     const protocol_type protocol = endpoint.protocol();
@@ -266,10 +278,10 @@ public:
   template <typename ExecutionContext>
   basic_socket_acceptor(ExecutionContext& context,
       const endpoint_type& endpoint, bool reuse_addr = true,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     const protocol_type protocol = endpoint.protocol();
@@ -305,7 +317,7 @@ public:
    */
   basic_socket_acceptor(const executor_type& ex,
       const protocol_type& protocol, const native_handle_type& native_acceptor)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
@@ -331,10 +343,10 @@ public:
   template <typename ExecutionContext>
   basic_socket_acceptor(ExecutionContext& context,
       const protocol_type& protocol, const native_handle_type& native_acceptor,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(),
@@ -394,10 +406,10 @@ public:
    */
   template <typename Protocol1, typename Executor1>
   basic_socket_acceptor(basic_socket_acceptor<Protocol1, Executor1>&& other,
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol1, Protocol>::value
           && is_convertible<Executor1, Executor>::value
-      >::type* = 0)
+      >::type = 0)
     : impl_(std::move(other.impl_))
   {
   }
@@ -415,7 +427,7 @@ public:
    * constructor.
    */
   template <typename Protocol1, typename Executor1>
-  typename enable_if<
+  typename constraint<
     is_convertible<Protocol1, Protocol>::value
       && is_convertible<Executor1, Executor>::value,
     basic_socket_acceptor&
@@ -1218,6 +1230,16 @@ public:
    *     boost::asio::ip::tcp::acceptor::wait_read,
    *     wait_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))
@@ -1253,9 +1275,9 @@ public:
    */
   template <typename Protocol1, typename Executor1>
   void accept(basic_socket<Protocol1, Executor1>& peer,
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol, Protocol1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     boost::system::error_code ec;
     impl_.get_service().accept(impl_.get_implementation(),
@@ -1289,9 +1311,9 @@ public:
   template <typename Protocol1, typename Executor1>
   BOOST_ASIO_SYNC_OP_VOID accept(
       basic_socket<Protocol1, Executor1>& peer, boost::system::error_code& ec,
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol, Protocol1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     impl_.get_service().accept(impl_.get_implementation(),
         peer, static_cast<endpoint_type*>(0), ec);
@@ -1335,6 +1357,16 @@ public:
    * boost::asio::ip::tcp::socket socket(my_context);
    * acceptor.async_accept(socket, accept_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename Protocol1, typename Executor1,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))
@@ -1344,9 +1376,9 @@ public:
   async_accept(basic_socket<Protocol1, Executor1>& peer,
       BOOST_ASIO_MOVE_ARG(AcceptHandler) handler
         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol, Protocol1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     return async_initiate<AcceptHandler, void (boost::system::error_code)>(
         initiate_async_accept(this), handler,
@@ -1448,6 +1480,16 @@ public:
    * not, the handler will not be invoked from within this function. On
    * immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename Executor1,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))
@@ -1570,6 +1612,16 @@ public:
    * ...
    * acceptor.async_accept(accept_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -1619,10 +1671,10 @@ public:
   template <typename Executor1>
   typename Protocol::socket::template rebind_executor<Executor1>::other
   accept(const Executor1& ex,
-      typename enable_if<
+      typename constraint<
         is_executor<Executor1>::value
           || execution::is_executor<Executor1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     boost::system::error_code ec;
     typename Protocol::socket::template
@@ -1659,9 +1711,9 @@ public:
   typename Protocol::socket::template rebind_executor<
       typename ExecutionContext::executor_type>::other
   accept(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
   {
     boost::system::error_code ec;
     typename Protocol::socket::template rebind_executor<
@@ -1702,10 +1754,10 @@ public:
   template <typename Executor1>
   typename Protocol::socket::template rebind_executor<Executor1>::other
   accept(const Executor1& ex, boost::system::error_code& ec,
-      typename enable_if<
+      typename constraint<
         is_executor<Executor1>::value
           || execution::is_executor<Executor1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     typename Protocol::socket::template
       rebind_executor<Executor1>::other peer(ex);
@@ -1745,9 +1797,9 @@ public:
   typename Protocol::socket::template rebind_executor<
       typename ExecutionContext::executor_type>::other
   accept(ExecutionContext& context, boost::system::error_code& ec,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
   {
     typename Protocol::socket::template rebind_executor<
         typename ExecutionContext::executor_type>::other peer(context);
@@ -1796,6 +1848,16 @@ public:
    * ...
    * acceptor.async_accept(my_context2, accept_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename Executor1,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -1809,10 +1871,10 @@ public:
   async_accept(const Executor1& ex,
       BOOST_ASIO_MOVE_ARG(MoveAcceptHandler) handler
         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
-      typename enable_if<
+      typename constraint<
         is_executor<Executor1>::value
           || execution::is_executor<Executor1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     typedef typename Protocol::socket::template rebind_executor<
       Executor1>::other other_socket_type;
@@ -1866,6 +1928,16 @@ public:
    * ...
    * acceptor.async_accept(my_context2, accept_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ExecutionContext,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -1879,9 +1951,9 @@ public:
   async_accept(ExecutionContext& context,
       BOOST_ASIO_MOVE_ARG(MoveAcceptHandler) handler
         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
   {
     typedef typename Protocol::socket::template rebind_executor<
       typename ExecutionContext::executor_type>::other other_socket_type;
@@ -2014,6 +2086,16 @@ public:
    * boost::asio::ip::tcp::endpoint endpoint;
    * acceptor.async_accept(endpoint, accept_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -2068,10 +2150,10 @@ public:
   template <typename Executor1>
   typename Protocol::socket::template rebind_executor<Executor1>::other
   accept(const Executor1& ex, endpoint_type& peer_endpoint,
-      typename enable_if<
+      typename constraint<
         is_executor<Executor1>::value
           || execution::is_executor<Executor1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     boost::system::error_code ec;
     typename Protocol::socket::template
@@ -2114,9 +2196,9 @@ public:
   typename Protocol::socket::template rebind_executor<
       typename ExecutionContext::executor_type>::other
   accept(ExecutionContext& context, endpoint_type& peer_endpoint,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
   {
     boost::system::error_code ec;
     typename Protocol::socket::template rebind_executor<
@@ -2164,10 +2246,10 @@ public:
   typename Protocol::socket::template rebind_executor<Executor1>::other
   accept(const executor_type& ex,
       endpoint_type& peer_endpoint, boost::system::error_code& ec,
-      typename enable_if<
+      typename constraint<
         is_executor<Executor1>::value
           || execution::is_executor<Executor1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     typename Protocol::socket::template
       rebind_executor<Executor1>::other peer(ex);
@@ -2214,9 +2296,9 @@ public:
       typename ExecutionContext::executor_type>::other
   accept(ExecutionContext& context,
       endpoint_type& peer_endpoint, boost::system::error_code& ec,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
   {
     typename Protocol::socket::template rebind_executor<
         typename ExecutionContext::executor_type>::other peer(context);
@@ -2272,6 +2354,16 @@ public:
    * boost::asio::ip::tcp::endpoint endpoint;
    * acceptor.async_accept(my_context2, endpoint, accept_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename Executor1,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -2285,10 +2377,10 @@ public:
   async_accept(const Executor1& ex, endpoint_type& peer_endpoint,
       BOOST_ASIO_MOVE_ARG(MoveAcceptHandler) handler
         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
-      typename enable_if<
+      typename constraint<
         is_executor<Executor1>::value
           || execution::is_executor<Executor1>::value
-      >::type* = 0)
+      >::type = 0)
   {
     typedef typename Protocol::socket::template rebind_executor<
       Executor1>::other other_socket_type;
@@ -2348,6 +2440,16 @@ public:
    * boost::asio::ip::tcp::endpoint endpoint;
    * acceptor.async_accept(my_context2, endpoint, accept_handler);
    * @endcode
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ExecutionContext,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -2362,9 +2464,9 @@ public:
       endpoint_type& peer_endpoint,
       BOOST_ASIO_MOVE_ARG(MoveAcceptHandler) handler
         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
   {
     typedef typename Protocol::socket::template rebind_executor<
       typename ExecutionContext::executor_type>::other other_socket_type;
@@ -2489,6 +2591,9 @@ private:
 #elif defined(BOOST_ASIO_HAS_IOCP)
   detail::io_object_impl<
     detail::win_iocp_socket_service<Protocol>, Executor> impl_;
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+  detail::io_object_impl<
+    detail::io_uring_socket_service<Protocol>, Executor> impl_;
 #else
   detail::io_object_impl<
     detail::reactive_socket_service<Protocol>, Executor> impl_;

sources/boost/asio/basic_socket_iostream.hpp

@@ -2,7 +2,7 @@
 // basic_socket_iostream.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/basic_socket_streambuf.hpp

@@ -2,7 +2,7 @@
 // basic_socket_streambuf.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/basic_stream_file.hpp

@@ -0,0 +1,732 @@
+//
+// basic_stream_file.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_BASIC_STREAM_FILE_HPP
+#define BOOST_ASIO_BASIC_STREAM_FILE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_FILE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#include <cstddef>
+#include <boost/asio/async_result.hpp>
+#include <boost/asio/basic_file.hpp>
+#include <boost/asio/detail/handler_type_requirements.hpp>
+#include <boost/asio/detail/non_const_lvalue.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+#include <boost/asio/error.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+#if !defined(BOOST_ASIO_BASIC_STREAM_FILE_FWD_DECL)
+#define BOOST_ASIO_BASIC_STREAM_FILE_FWD_DECL
+
+// Forward declaration with defaulted arguments.
+template <typename Executor = any_io_executor>
+class basic_stream_file;
+
+#endif // !defined(BOOST_ASIO_BASIC_STREAM_FILE_FWD_DECL)
+
+/// Provides stream-oriented file functionality.
+/**
+ * The basic_stream_file class template provides asynchronous and blocking
+ * stream-oriented file functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
+ */
+template <typename Executor>
+class basic_stream_file
+  : public basic_file<Executor>
+{
+public:
+  /// The type of the executor associated with the object.
+  typedef Executor executor_type;
+
+  /// Rebinds the file type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The file type when rebound to the specified executor.
+    typedef basic_stream_file<Executor1> other;
+  };
+
+  /// The native representation of a file.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_handle_type;
+#else
+  typedef typename basic_file<Executor>::native_handle_type native_handle_type;
+#endif
+
+  /// Construct a basic_stream_file without opening it.
+  /**
+   * This constructor initialises a file without opening it. The file needs to
+   * be opened before data can be read from or or written to it.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   */
+  explicit basic_stream_file(const executor_type& ex)
+    : basic_file<Executor>(ex)
+  {
+    this->impl_.get_service().set_is_stream(
+        this->impl_.get_implementation(), true);
+  }
+
+  /// Construct a basic_stream_file without opening it.
+  /**
+   * This constructor initialises a file without opening it. The file needs to
+   * be opened before data can be read from or or written to it.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   */
+  template <typename ExecutionContext>
+  explicit basic_stream_file(ExecutionContext& context,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(context)
+  {
+    this->impl_.get_service().set_is_stream(
+        this->impl_.get_implementation(), true);
+  }
+
+  /// Construct and open a basic_stream_file.
+  /**
+   * This constructor initialises and opens a file.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_stream_file(const executor_type& ex,
+      const char* path, file_base::flags open_flags)
+    : basic_file<Executor>(ex)
+  {
+    boost::system::error_code ec;
+    this->impl_.get_service().set_is_stream(
+        this->impl_.get_implementation(), true);
+    this->impl_.get_service().open(
+        this->impl_.get_implementation(),
+        path, open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Construct and open a basic_stream_file.
+  /**
+   * This constructor initialises and opens a file.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_stream_file(ExecutionContext& context,
+      const char* path, file_base::flags open_flags,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(context)
+  {
+    boost::system::error_code ec;
+    this->impl_.get_service().set_is_stream(
+        this->impl_.get_implementation(), true);
+    this->impl_.get_service().open(
+        this->impl_.get_implementation(),
+        path, open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Construct and open a basic_stream_file.
+  /**
+   * This constructor initialises and opens a file.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_stream_file(const executor_type& ex,
+      const std::string& path, file_base::flags open_flags)
+    : basic_file<Executor>(ex)
+  {
+    boost::system::error_code ec;
+    this->impl_.get_service().set_is_stream(
+        this->impl_.get_implementation(), true);
+    this->impl_.get_service().open(
+        this->impl_.get_implementation(),
+        path.c_str(), open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Construct and open a basic_stream_file.
+  /**
+   * This constructor initialises and opens a file.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param path The path name identifying the file to be opened.
+   *
+   * @param open_flags A set of flags that determine how the file should be
+   * opened.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_stream_file(ExecutionContext& context,
+      const std::string& path, file_base::flags open_flags,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(context)
+  {
+    boost::system::error_code ec;
+    this->impl_.get_service().set_is_stream(
+        this->impl_.get_implementation(), true);
+    this->impl_.get_service().open(
+        this->impl_.get_implementation(),
+        path.c_str(), open_flags, ec);
+    boost::asio::detail::throw_error(ec, "open");
+  }
+
+  /// Construct a basic_stream_file on an existing native file.
+  /**
+   * This constructor initialises a stream file object to hold an existing
+   * native file.
+   *
+   * @param ex The I/O executor that the file will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the file.
+   *
+   * @param native_file The new underlying file implementation.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_stream_file(const executor_type& ex,
+      const native_handle_type& native_file)
+    : basic_file<Executor>(ex, native_file)
+  {
+    this->impl_.get_service().set_is_stream(
+        this->impl_.get_implementation(), true);
+  }
+
+  /// Construct a basic_stream_file on an existing native file.
+  /**
+   * This constructor initialises a stream file object to hold an existing
+   * native file.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the file will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the file.
+   *
+   * @param native_file The new underlying file implementation.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_stream_file(ExecutionContext& context,
+      const native_handle_type& native_file,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(context, native_file)
+  {
+    this->impl_.get_service().set_is_stream(
+        this->impl_.get_implementation(), true);
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move-construct a basic_stream_file from another.
+  /**
+   * This constructor moves a stream file from one object to another.
+   *
+   * @param other The other basic_stream_file object from which the move
+   * will occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_stream_file(const executor_type&)
+   * constructor.
+   */
+  basic_stream_file(basic_stream_file&& other) BOOST_ASIO_NOEXCEPT
+    : basic_file<Executor>(std::move(other))
+  {
+  }
+
+  /// Move-assign a basic_stream_file from another.
+  /**
+   * This assignment operator moves a stream file from one object to another.
+   *
+   * @param other The other basic_stream_file object from which the move
+   * will occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_stream_file(const executor_type&)
+   * constructor.
+   */
+  basic_stream_file& operator=(basic_stream_file&& other)
+  {
+    basic_file<Executor>::operator=(std::move(other));
+    return *this;
+  }
+
+  /// Move-construct a basic_stream_file from a file of another executor
+  /// type.
+  /**
+   * This constructor moves a stream file from one object to another.
+   *
+   * @param other The other basic_stream_file object from which the move
+   * will occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_stream_file(const executor_type&)
+   * constructor.
+   */
+  template <typename Executor1>
+  basic_stream_file(basic_stream_file<Executor1>&& other,
+      typename constraint<
+        is_convertible<Executor1, Executor>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_file<Executor>(std::move(other))
+  {
+  }
+
+  /// Move-assign a basic_stream_file from a file of another executor type.
+  /**
+   * This assignment operator moves a stream file from one object to another.
+   *
+   * @param other The other basic_stream_file object from which the move
+   * will occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_stream_file(const executor_type&)
+   * constructor.
+   */
+  template <typename Executor1>
+  typename constraint<
+    is_convertible<Executor1, Executor>::value,
+    basic_stream_file&
+  >::type operator=(basic_stream_file<Executor1>&& other)
+  {
+    basic_file<Executor>::operator=(std::move(other));
+    return *this;
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Destroys the file.
+  /**
+   * This function destroys the file, cancelling any outstanding asynchronous
+   * operations associated with the file as if by calling @c cancel.
+   */
+  ~basic_stream_file()
+  {
+  }
+
+  /// Seek to a position in the file.
+  /**
+   * This function updates the current position in the file.
+   *
+   * @param offset The requested position in the file, relative to @c whence.
+   *
+   * @param whence One of @c seek_set, @c seek_cur or @c seek_end.
+   *
+   * @returns The new position relative to the beginning of the file.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  uint64_t seek(int64_t offset, file_base::seek_basis whence)
+  {
+    boost::system::error_code ec;
+    uint64_t n = this->impl_.get_service().seek(
+        this->impl_.get_implementation(), offset, whence, ec);
+    boost::asio::detail::throw_error(ec, "seek");
+    return n;
+  }
+
+  /// Seek to a position in the file.
+  /**
+   * This function updates the current position in the file.
+   *
+   * @param offset The requested position in the file, relative to @c whence.
+   *
+   * @param whence One of @c seek_set, @c seek_cur or @c seek_end.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The new position relative to the beginning of the file.
+   */
+  uint64_t seek(int64_t offset, file_base::seek_basis whence,
+      boost::system::error_code& ec)
+  {
+    return this->impl_.get_service().seek(
+        this->impl_.get_implementation(), offset, whence, ec);
+  }
+
+  /// Write some data to the file.
+  /**
+   * This function is used to write data to the stream file. The function call
+   * will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the file.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws boost::system::system_error Thrown on failure. An error code of
+   * boost::asio::error::eof indicates that the end of the file was reached.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * file.write_some(boost::asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    boost::system::error_code ec;
+    std::size_t s = this->impl_.get_service().write_some(
+        this->impl_.get_implementation(), buffers, ec);
+    boost::asio::detail::throw_error(ec, "write_some");
+    return s;
+  }
+
+  /// Write some data to the file.
+  /**
+   * This function is used to write data to the stream file. The function call
+   * will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the file.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      boost::system::error_code& ec)
+  {
+    return this->impl_.get_service().write_some(
+        this->impl_.get_implementation(), buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  /**
+   * This function is used to asynchronously write data to the stream file.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be written to the file.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const boost::system::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. On
+   * immediate completion, invocation of the handler will be performed in a
+   * manner equivalent to using boost::asio::post().
+   *
+   * @note The write operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write function if you need to ensure that all
+   * data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * file.async_write_some(boost::asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
+   */
+  template <typename ConstBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) WriteHandler
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(WriteHandler,
+      void (boost::system::error_code, std::size_t))
+  async_write_some(const ConstBufferSequence& buffers,
+      BOOST_ASIO_MOVE_ARG(WriteHandler) handler
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+  {
+    return async_initiate<WriteHandler,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_write_some(this), handler, buffers);
+  }
+
+  /// Read some data from the file.
+  /**
+   * This function is used to read data from the stream file. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws boost::system::system_error Thrown on failure. An error code of
+   * boost::asio::error::eof indicates that the end of the file was reached.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * file.read_some(boost::asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    boost::system::error_code ec;
+    std::size_t s = this->impl_.get_service().read_some(
+        this->impl_.get_implementation(), buffers, ec);
+    boost::asio::detail::throw_error(ec, "read_some");
+    return s;
+  }
+
+  /// Read some data from the file.
+  /**
+   * This function is used to read data from the stream file. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      boost::system::error_code& ec)
+  {
+    return this->impl_.get_service().read_some(
+        this->impl_.get_implementation(), buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  /**
+   * This function is used to asynchronously read data from the stream file.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const boost::system::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. On
+   * immediate completion, invocation of the handler will be performed in a
+   * manner equivalent to using boost::asio::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read function if you need to ensure that the
+   * requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * file.async_read_some(boost::asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
+   */
+  template <typename MutableBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) ReadHandler
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+      void (boost::system::error_code, std::size_t))
+  async_read_some(const MutableBufferSequence& buffers,
+      BOOST_ASIO_MOVE_ARG(ReadHandler) handler
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+  {
+    return async_initiate<ReadHandler,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_read_some(this), handler, buffers);
+  }
+
+private:
+  // Disallow copying and assignment.
+  basic_stream_file(const basic_stream_file&) BOOST_ASIO_DELETED;
+  basic_stream_file& operator=(const basic_stream_file&) BOOST_ASIO_DELETED;
+
+  class initiate_async_write_some
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_write_some(basic_stream_file* self)
+      : self_(self)
+    {
+    }
+
+    executor_type get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename WriteHandler, typename ConstBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(WriteHandler) handler,
+        const ConstBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a WriteHandler.
+      BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
+
+      detail::non_const_lvalue<WriteHandler> handler2(handler);
+      self_->impl_.get_service().async_write_some(
+          self_->impl_.get_implementation(), buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_stream_file* self_;
+  };
+
+  class initiate_async_read_some
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_read_some(basic_stream_file* self)
+      : self_(self)
+    {
+    }
+
+    executor_type get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename ReadHandler, typename MutableBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(ReadHandler) handler,
+        const MutableBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a ReadHandler.
+      BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+      detail::non_const_lvalue<ReadHandler> handler2(handler);
+      self_->impl_.get_service().async_read_some(
+          self_->impl_.get_implementation(), buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_stream_file* self_;
+  };
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_ASIO_HAS_FILE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#endif // BOOST_ASIO_BASIC_STREAM_FILE_HPP

sources/boost/asio/basic_stream_socket.hpp

@@ -2,7 +2,7 @@
 // basic_stream_socket.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -47,6 +47,12 @@ class basic_stream_socket;
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  *
+ * Synchronous @c send, @c receive, and @c connect operations are thread safe
+ * with respect to each other, if the underlying operating system calls are
+ * also thread safe. This means that it is permitted to perform concurrent
+ * calls to these synchronous operations on a single socket object. Other
+ * synchronous operations, such as @c open or @c close, are not thread safe.
+ *
  * @par Concepts:
  * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
  */
@@ -106,9 +112,9 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_stream_socket(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context)
   {
   }
@@ -145,9 +151,10 @@ public:
    */
   template <typename ExecutionContext>
   basic_stream_socket(ExecutionContext& context, const protocol_type& protocol,
-      typename enable_if<
+      typename constraint<
-        is_convertible<ExecutionContext&, execution_context&>::value
+        is_convertible<ExecutionContext&, execution_context&>::value,
-      >::type* = 0)
+        defaulted_constraint
+      >::type = defaulted_constraint())
     : basic_socket<Protocol, Executor>(context, protocol)
   {
   }
@@ -190,9 +197,9 @@ public:
    */
   template <typename ExecutionContext>
   basic_stream_socket(ExecutionContext& context, const endpoint_type& endpoint,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context, endpoint)
   {
   }
@@ -235,9 +242,9 @@ public:
   template <typename ExecutionContext>
   basic_stream_socket(ExecutionContext& context,
       const protocol_type& protocol, const native_handle_type& native_socket,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(context, protocol, native_socket)
   {
   }
@@ -290,10 +297,10 @@ public:
    */
   template <typename Protocol1, typename Executor1>
   basic_stream_socket(basic_stream_socket<Protocol1, Executor1>&& other,
-      typename enable_if<
+      typename constraint<
         is_convertible<Protocol1, Protocol>::value
           && is_convertible<Executor1, Executor>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_socket<Protocol, Executor>(std::move(other))
   {
   }
@@ -310,7 +317,7 @@ public:
    * constructor.
    */
   template <typename Protocol1, typename Executor1>
-  typename enable_if<
+  typename constraint<
     is_convertible<Protocol1, Protocol>::value
       && is_convertible<Executor1, Executor>::value,
     basic_stream_socket&
@@ -463,6 +470,16 @@ public:
    * See the @ref buffer documentation for information on sending multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -516,6 +533,16 @@ public:
    * See the @ref buffer documentation for information on sending multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -674,6 +701,16 @@ public:
    * See the @ref buffer documentation for information on receiving into
    * multiple buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -729,6 +766,16 @@ public:
    * See the @ref buffer documentation for information on receiving into
    * multiple buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -841,6 +888,16 @@ public:
    * See the @ref buffer documentation for information on writing multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename ConstBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -956,6 +1013,16 @@ public:
    * See the @ref buffer documentation for information on reading into multiple
    * buffers in one go, and how to use it with arrays, boost::array or
    * std::vector.
+   *
+   * @par Per-Operation Cancellation
+   * On POSIX or Windows operating systems, this asynchronous operation supports
+   * cancellation for the following boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <typename MutableBufferSequence,
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,

sources/boost/asio/basic_streambuf.hpp

@@ -2,7 +2,7 @@
 // basic_streambuf.hpp
 // ~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/basic_streambuf_fwd.hpp

@@ -2,7 +2,7 @@
 // basic_streambuf_fwd.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/basic_waitable_timer.hpp

@@ -2,7 +2,7 @@
 // basic_waitable_timer.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -176,7 +176,7 @@ public:
    * dispatch handlers for any asynchronous operations performed on the timer.
    */
   explicit basic_waitable_timer(const executor_type& ex)
-    : impl_(ex)
+    : impl_(0, ex)
   {
   }
 
@@ -192,10 +192,10 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_waitable_timer(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
   }
 
@@ -210,7 +210,7 @@ public:
    * as an absolute time.
    */
   basic_waitable_timer(const executor_type& ex, const time_point& expiry_time)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().expires_at(impl_.get_implementation(), expiry_time, ec);
@@ -231,10 +231,10 @@ public:
   template <typename ExecutionContext>
   explicit basic_waitable_timer(ExecutionContext& context,
       const time_point& expiry_time,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().expires_at(impl_.get_implementation(), expiry_time, ec);
@@ -252,7 +252,7 @@ public:
    * now.
    */
   basic_waitable_timer(const executor_type& ex, const duration& expiry_time)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().expires_after(
@@ -274,10 +274,10 @@ public:
   template <typename ExecutionContext>
   explicit basic_waitable_timer(ExecutionContext& context,
       const duration& expiry_time,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
-    : impl_(context)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().expires_after(
@@ -338,9 +338,9 @@ public:
   template <typename Executor1>
   basic_waitable_timer(
       basic_waitable_timer<Clock, WaitTraits, Executor1>&& other,
-      typename enable_if<
+      typename constraint<
           is_convertible<Executor1, Executor>::value
-      >::type* = 0)
+      >::type = 0)
     : impl_(std::move(other.impl_))
   {
   }
@@ -358,7 +358,7 @@ public:
    * constructor.
    */
   template <typename Executor1>
-  typename enable_if<
+  typename constraint<
     is_convertible<Executor1, Executor>::value,
     basic_waitable_timer&
   >::type operator=(basic_waitable_timer<Clock, WaitTraits, Executor1>&& other)
@@ -747,6 +747,16 @@ public:
    * not, the handler will not be invoked from within this function. On
    * immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
+   *
+   * @par Per-Operation Cancellation
+   * This asynchronous operation supports cancellation for the following
+   * boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
   template <
       BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))

sources/boost/asio/basic_writable_pipe.hpp

@@ -0,0 +1,521 @@
+//
+// basic_writable_pipe.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_BASIC_WRITABLE_PIPE_HPP
+#define BOOST_ASIO_BASIC_WRITABLE_PIPE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_PIPE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#include <string>
+#include <boost/asio/any_io_executor.hpp>
+#include <boost/asio/async_result.hpp>
+#include <boost/asio/detail/handler_type_requirements.hpp>
+#include <boost/asio/detail/io_object_impl.hpp>
+#include <boost/asio/detail/non_const_lvalue.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/error.hpp>
+#include <boost/asio/execution_context.hpp>
+#if defined(BOOST_ASIO_HAS_IOCP)
+# include <boost/asio/detail/win_iocp_handle_service.hpp>
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+# include <boost/asio/detail/io_uring_descriptor_service.hpp>
+#else
+# include <boost/asio/detail/reactive_descriptor_service.hpp>
+#endif
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+# include <utility>
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+/// Provides pipe functionality.
+/**
+ * The basic_writable_pipe class provides a wrapper over pipe
+ * functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename Executor = any_io_executor>
+class basic_writable_pipe
+{
+public:
+  /// The type of the executor associated with the object.
+  typedef Executor executor_type;
+
+  /// Rebinds the pipe type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The pipe type when rebound to the specified executor.
+    typedef basic_writable_pipe<Executor1> other;
+  };
+
+  /// The native representation of a pipe.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_handle_type;
+#elif defined(BOOST_ASIO_HAS_IOCP)
+  typedef detail::win_iocp_handle_service::native_handle_type
+    native_handle_type;
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+  typedef detail::io_uring_descriptor_service::native_handle_type
+    native_handle_type;
+#else
+  typedef detail::reactive_descriptor_service::native_handle_type
+    native_handle_type;
+#endif
+
+  /// A basic_writable_pipe is always the lowest layer.
+  typedef basic_writable_pipe lowest_layer_type;
+
+  /// Construct a basic_writable_pipe without opening it.
+  /**
+   * This constructor creates a pipe without opening it.
+   *
+   * @param ex The I/O executor that the pipe will use, by default, to dispatch
+   * handlers for any asynchronous operations performed on the pipe.
+   */
+  explicit basic_writable_pipe(const executor_type& ex)
+    : impl_(0, ex)
+  {
+  }
+
+  /// Construct a basic_writable_pipe without opening it.
+  /**
+   * This constructor creates a pipe without opening it.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the pipe will use, by default, to dispatch handlers for any asynchronous
+   * operations performed on the pipe.
+   */
+  template <typename ExecutionContext>
+  explicit basic_writable_pipe(ExecutionContext& context,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
+  {
+  }
+
+  /// Construct a basic_writable_pipe on an existing native pipe.
+  /**
+   * This constructor creates a pipe object to hold an existing native
+   * pipe.
+   *
+   * @param ex The I/O executor that the pipe will use, by default, to
+   * dispatch handlers for any asynchronous operations performed on the
+   * pipe.
+   *
+   * @param native_pipe A native pipe.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_writable_pipe(const executor_type& ex,
+      const native_handle_type& native_pipe)
+    : impl_(0, ex)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(impl_.get_implementation(),
+        native_pipe, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+  /// Construct a basic_writable_pipe on an existing native pipe.
+  /**
+   * This constructor creates a pipe object to hold an existing native
+   * pipe.
+   *
+   * @param context An execution context which provides the I/O executor that
+   * the pipe will use, by default, to dispatch handlers for any
+   * asynchronous operations performed on the pipe.
+   *
+   * @param native_pipe A native pipe.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  template <typename ExecutionContext>
+  basic_writable_pipe(ExecutionContext& context,
+      const native_handle_type& native_pipe,
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value
+      >::type = 0)
+    : impl_(0, 0, context)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(impl_.get_implementation(),
+        native_pipe, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move-construct a basic_writable_pipe from another.
+  /**
+   * This constructor moves a pipe from one object to another.
+   *
+   * @param other The other basic_writable_pipe object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_writable_pipe(const executor_type&)
+   * constructor.
+   */
+  basic_writable_pipe(basic_writable_pipe&& other)
+    : impl_(std::move(other.impl_))
+  {
+  }
+
+  /// Move-assign a basic_writable_pipe from another.
+  /**
+   * This assignment operator moves a pipe from one object to another.
+   *
+   * @param other The other basic_writable_pipe object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c basic_writable_pipe(const executor_type&)
+   * constructor.
+   */
+  basic_writable_pipe& operator=(basic_writable_pipe&& other)
+  {
+    impl_ = std::move(other.impl_);
+    return *this;
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Destroys the pipe.
+  /**
+   * This function destroys the pipe, cancelling any outstanding
+   * asynchronous wait operations associated with the pipe as if by
+   * calling @c cancel.
+   */
+  ~basic_writable_pipe()
+  {
+  }
+
+  /// Get the executor associated with the object.
+  executor_type get_executor() BOOST_ASIO_NOEXCEPT
+  {
+    return impl_.get_executor();
+  }
+
+  /// Get a reference to the lowest layer.
+  /**
+   * This function returns a reference to the lowest layer in a stack of
+   * layers. Since a basic_writable_pipe cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A reference to the lowest layer in the stack of layers. Ownership
+   * is not transferred to the caller.
+   */
+  lowest_layer_type& lowest_layer()
+  {
+    return *this;
+  }
+
+  /// Get a const reference to the lowest layer.
+  /**
+   * This function returns a const reference to the lowest layer in a stack of
+   * layers. Since a basic_writable_pipe cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A const reference to the lowest layer in the stack of layers.
+   * Ownership is not transferred to the caller.
+   */
+  const lowest_layer_type& lowest_layer() const
+  {
+    return *this;
+  }
+
+  /// Assign an existing native pipe to the pipe.
+  /*
+   * This function opens the pipe to hold an existing native pipe.
+   *
+   * @param native_pipe A native pipe.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void assign(const native_handle_type& native_pipe)
+  {
+    boost::system::error_code ec;
+    impl_.get_service().assign(impl_.get_implementation(), native_pipe, ec);
+    boost::asio::detail::throw_error(ec, "assign");
+  }
+
+  /// Assign an existing native pipe to the pipe.
+  /*
+   * This function opens the pipe to hold an existing native pipe.
+   *
+   * @param native_pipe A native pipe.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID assign(const native_handle_type& native_pipe,
+      boost::system::error_code& ec)
+  {
+    impl_.get_service().assign(impl_.get_implementation(), native_pipe, ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Determine whether the pipe is open.
+  bool is_open() const
+  {
+    return impl_.get_service().is_open(impl_.get_implementation());
+  }
+
+  /// Close the pipe.
+  /**
+   * This function is used to close the pipe. Any asynchronous write operations
+   * will be cancelled immediately, and will complete with the
+   * boost::asio::error::operation_aborted error.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void close()
+  {
+    boost::system::error_code ec;
+    impl_.get_service().close(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "close");
+  }
+
+  /// Close the pipe.
+  /**
+   * This function is used to close the pipe. Any asynchronous write operations
+   * will be cancelled immediately, and will complete with the
+   * boost::asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID close(boost::system::error_code& ec)
+  {
+    impl_.get_service().close(impl_.get_implementation(), ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Get the native pipe representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * pipe. This is intended to allow access to native pipe
+   * functionality that is not otherwise provided.
+   */
+  native_handle_type native_handle()
+  {
+    return impl_.get_service().native_handle(impl_.get_implementation());
+  }
+
+  /// Cancel all asynchronous operations associated with the pipe.
+  /**
+   * This function causes all outstanding asynchronous write operations to
+   * finish immediately, and the handlers for cancelled operations will be
+   * passed the boost::asio::error::operation_aborted error.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  void cancel()
+  {
+    boost::system::error_code ec;
+    impl_.get_service().cancel(impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "cancel");
+  }
+
+  /// Cancel all asynchronous operations associated with the pipe.
+  /**
+   * This function causes all outstanding asynchronous write operations to
+   * finish immediately, and the handlers for cancelled operations will be
+   * passed the boost::asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  BOOST_ASIO_SYNC_OP_VOID cancel(boost::system::error_code& ec)
+  {
+    impl_.get_service().cancel(impl_.get_implementation(), ec);
+    BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Write some data to the pipe.
+  /**
+   * This function is used to write data to the pipe. The function call will
+   * block until one or more bytes of the data has been written successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the pipe.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws boost::system::system_error Thrown on failure. An error code of
+   * boost::asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * pipe.write_some(boost::asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    boost::system::error_code ec;
+    std::size_t s = impl_.get_service().write_some(
+        impl_.get_implementation(), buffers, ec);
+    boost::asio::detail::throw_error(ec, "write_some");
+    return s;
+  }
+
+  /// Write some data to the pipe.
+  /**
+   * This function is used to write data to the pipe. The function call will
+   * block until one or more bytes of the data has been written successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the pipe.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      boost::system::error_code& ec)
+  {
+    return impl_.get_service().write_some(
+        impl_.get_implementation(), buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  /**
+   * This function is used to asynchronously write data to the pipe. The
+   * function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be written to the pipe.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const boost::system::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. On
+   * immediate completion, invocation of the handler will be performed in a
+   * manner equivalent to using boost::asio::post().
+   *
+   * @note The write operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write function if you need to ensure that all
+   * data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * pipe.async_write_some(boost::asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) WriteHandler
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(WriteHandler,
+      void (boost::system::error_code, std::size_t))
+  async_write_some(const ConstBufferSequence& buffers,
+      BOOST_ASIO_MOVE_ARG(WriteHandler) handler
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+  {
+    return async_initiate<WriteHandler,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_write_some(this), handler, buffers);
+  }
+
+private:
+  // Disallow copying and assignment.
+  basic_writable_pipe(const basic_writable_pipe&) BOOST_ASIO_DELETED;
+  basic_writable_pipe& operator=(const basic_writable_pipe&) BOOST_ASIO_DELETED;
+
+  class initiate_async_write_some
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_write_some(basic_writable_pipe* self)
+      : self_(self)
+    {
+    }
+
+    executor_type get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename WriteHandler, typename ConstBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(WriteHandler) handler,
+        const ConstBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a WriteHandler.
+      BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
+
+      detail::non_const_lvalue<WriteHandler> handler2(handler);
+      self_->impl_.get_service().async_write_some(
+          self_->impl_.get_implementation(), buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_writable_pipe* self_;
+  };
+
+#if defined(BOOST_ASIO_HAS_IOCP)
+  detail::io_object_impl<detail::win_iocp_handle_service, Executor> impl_;
+#elif defined(BOOST_ASIO_HAS_IO_URING_AS_DEFAULT)
+  detail::io_object_impl<detail::io_uring_descriptor_service, Executor> impl_;
+#else
+  detail::io_object_impl<detail::reactive_descriptor_service, Executor> impl_;
+#endif
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_ASIO_HAS_PIPE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#endif // BOOST_ASIO_BASIC_WRITABLE_PIPE_HPP

sources/boost/asio/bind_cancellation_slot.hpp

@@ -0,0 +1,723 @@
+//
+// bind_cancellation_slot.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_BIND_CANCELLATION_SLOT_HPP
+#define BOOST_ASIO_BIND_CANCELLATION_SLOT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/detail/variadic_templates.hpp>
+#include <boost/asio/associated_cancellation_slot.hpp>
+#include <boost/asio/associator.hpp>
+#include <boost/asio/async_result.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+// Helper to automatically define nested typedef result_type.
+
+template <typename T, typename = void>
+struct cancellation_slot_binder_result_type
+{
+protected:
+  typedef void result_type_or_void;
+};
+
+template <typename T>
+struct cancellation_slot_binder_result_type<T,
+  typename void_type<typename T::result_type>::type>
+{
+  typedef typename T::result_type result_type;
+protected:
+  typedef result_type result_type_or_void;
+};
+
+template <typename R>
+struct cancellation_slot_binder_result_type<R(*)()>
+{
+  typedef R result_type;
+protected:
+  typedef result_type result_type_or_void;
+};
+
+template <typename R>
+struct cancellation_slot_binder_result_type<R(&)()>
+{
+  typedef R result_type;
+protected:
+  typedef result_type result_type_or_void;
+};
+
+template <typename R, typename A1>
+struct cancellation_slot_binder_result_type<R(*)(A1)>
+{
+  typedef R result_type;
+protected:
+  typedef result_type result_type_or_void;
+};
+
+template <typename R, typename A1>
+struct cancellation_slot_binder_result_type<R(&)(A1)>
+{
+  typedef R result_type;
+protected:
+  typedef result_type result_type_or_void;
+};
+
+template <typename R, typename A1, typename A2>
+struct cancellation_slot_binder_result_type<R(*)(A1, A2)>
+{
+  typedef R result_type;
+protected:
+  typedef result_type result_type_or_void;
+};
+
+template <typename R, typename A1, typename A2>
+struct cancellation_slot_binder_result_type<R(&)(A1, A2)>
+{
+  typedef R result_type;
+protected:
+  typedef result_type result_type_or_void;
+};
+
+// Helper to automatically define nested typedef argument_type.
+
+template <typename T, typename = void>
+struct cancellation_slot_binder_argument_type {};
+
+template <typename T>
+struct cancellation_slot_binder_argument_type<T,
+  typename void_type<typename T::argument_type>::type>
+{
+  typedef typename T::argument_type argument_type;
+};
+
+template <typename R, typename A1>
+struct cancellation_slot_binder_argument_type<R(*)(A1)>
+{
+  typedef A1 argument_type;
+};
+
+template <typename R, typename A1>
+struct cancellation_slot_binder_argument_type<R(&)(A1)>
+{
+  typedef A1 argument_type;
+};
+
+// Helper to automatically define nested typedefs first_argument_type and
+// second_argument_type.
+
+template <typename T, typename = void>
+struct cancellation_slot_binder_argument_types {};
+
+template <typename T>
+struct cancellation_slot_binder_argument_types<T,
+  typename void_type<typename T::first_argument_type>::type>
+{
+  typedef typename T::first_argument_type first_argument_type;
+  typedef typename T::second_argument_type second_argument_type;
+};
+
+template <typename R, typename A1, typename A2>
+struct cancellation_slot_binder_argument_type<R(*)(A1, A2)>
+{
+  typedef A1 first_argument_type;
+  typedef A2 second_argument_type;
+};
+
+template <typename R, typename A1, typename A2>
+struct cancellation_slot_binder_argument_type<R(&)(A1, A2)>
+{
+  typedef A1 first_argument_type;
+  typedef A2 second_argument_type;
+};
+
+// Helper to enable SFINAE on zero-argument operator() below.
+
+template <typename T, typename = void>
+struct cancellation_slot_binder_result_of0
+{
+  typedef void type;
+};
+
+template <typename T>
+struct cancellation_slot_binder_result_of0<T,
+  typename void_type<typename result_of<T()>::type>::type>
+{
+  typedef typename result_of<T()>::type type;
+};
+
+} // namespace detail
+
+/// A call wrapper type to bind a cancellation slot of type @c CancellationSlot
+/// to an object of type @c T.
+template <typename T, typename CancellationSlot>
+class cancellation_slot_binder
+#if !defined(GENERATING_DOCUMENTATION)
+  : public detail::cancellation_slot_binder_result_type<T>,
+    public detail::cancellation_slot_binder_argument_type<T>,
+    public detail::cancellation_slot_binder_argument_types<T>
+#endif // !defined(GENERATING_DOCUMENTATION)
+{
+public:
+  /// The type of the target object.
+  typedef T target_type;
+
+  /// The type of the associated cancellation slot.
+  typedef CancellationSlot cancellation_slot_type;
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// The return type if a function.
+  /**
+   * The type of @c result_type is based on the type @c T of the wrapper's
+   * target object:
+   *
+   * @li if @c T is a pointer to function type, @c result_type is a synonym for
+   * the return type of @c T;
+   *
+   * @li if @c T is a class type with a member type @c result_type, then @c
+   * result_type is a synonym for @c T::result_type;
+   *
+   * @li otherwise @c result_type is not defined.
+   */
+  typedef see_below result_type;
+
+  /// The type of the function's argument.
+  /**
+   * The type of @c argument_type is based on the type @c T of the wrapper's
+   * target object:
+   *
+   * @li if @c T is a pointer to a function type accepting a single argument,
+   * @c argument_type is a synonym for the return type of @c T;
+   *
+   * @li if @c T is a class type with a member type @c argument_type, then @c
+   * argument_type is a synonym for @c T::argument_type;
+   *
+   * @li otherwise @c argument_type is not defined.
+   */
+  typedef see_below argument_type;
+
+  /// The type of the function's first argument.
+  /**
+   * The type of @c first_argument_type is based on the type @c T of the
+   * wrapper's target object:
+   *
+   * @li if @c T is a pointer to a function type accepting two arguments, @c
+   * first_argument_type is a synonym for the return type of @c T;
+   *
+   * @li if @c T is a class type with a member type @c first_argument_type,
+   * then @c first_argument_type is a synonym for @c T::first_argument_type;
+   *
+   * @li otherwise @c first_argument_type is not defined.
+   */
+  typedef see_below first_argument_type;
+
+  /// The type of the function's second argument.
+  /**
+   * The type of @c second_argument_type is based on the type @c T of the
+   * wrapper's target object:
+   *
+   * @li if @c T is a pointer to a function type accepting two arguments, @c
+   * second_argument_type is a synonym for the return type of @c T;
+   *
+   * @li if @c T is a class type with a member type @c first_argument_type,
+   * then @c second_argument_type is a synonym for @c T::second_argument_type;
+   *
+   * @li otherwise @c second_argument_type is not defined.
+   */
+  typedef see_below second_argument_type;
+#endif // defined(GENERATING_DOCUMENTATION)
+
+  /// Construct a cancellation slot wrapper for the specified object.
+  /**
+   * This constructor is only valid if the type @c T is constructible from type
+   * @c U.
+   */
+  template <typename U>
+  cancellation_slot_binder(const cancellation_slot_type& s,
+      BOOST_ASIO_MOVE_ARG(U) u)
+    : slot_(s),
+      target_(BOOST_ASIO_MOVE_CAST(U)(u))
+  {
+  }
+
+  /// Copy constructor.
+  cancellation_slot_binder(const cancellation_slot_binder& other)
+    : slot_(other.get_cancellation_slot()),
+      target_(other.get())
+  {
+  }
+
+  /// Construct a copy, but specify a different cancellation slot.
+  cancellation_slot_binder(const cancellation_slot_type& s,
+      const cancellation_slot_binder& other)
+    : slot_(s),
+      target_(other.get())
+  {
+  }
+
+  /// Construct a copy of a different cancellation slot wrapper type.
+  /**
+   * This constructor is only valid if the @c CancellationSlot type is
+   * constructible from type @c OtherCancellationSlot, and the type @c T is
+   * constructible from type @c U.
+   */
+  template <typename U, typename OtherCancellationSlot>
+  cancellation_slot_binder(
+      const cancellation_slot_binder<U, OtherCancellationSlot>& other)
+    : slot_(other.get_cancellation_slot()),
+      target_(other.get())
+  {
+  }
+
+  /// Construct a copy of a different cancellation slot wrapper type, but
+  /// specify a different cancellation slot.
+  /**
+   * This constructor is only valid if the type @c T is constructible from type
+   * @c U.
+   */
+  template <typename U, typename OtherCancellationSlot>
+  cancellation_slot_binder(const cancellation_slot_type& s,
+      const cancellation_slot_binder<U, OtherCancellationSlot>& other)
+    : slot_(s),
+      target_(other.get())
+  {
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Move constructor.
+  cancellation_slot_binder(cancellation_slot_binder&& other)
+    : slot_(BOOST_ASIO_MOVE_CAST(cancellation_slot_type)(
+          other.get_cancellation_slot())),
+      target_(BOOST_ASIO_MOVE_CAST(T)(other.get()))
+  {
+  }
+
+  /// Move construct the target object, but specify a different cancellation
+  /// slot.
+  cancellation_slot_binder(const cancellation_slot_type& s,
+      cancellation_slot_binder&& other)
+    : slot_(s),
+      target_(BOOST_ASIO_MOVE_CAST(T)(other.get()))
+  {
+  }
+
+  /// Move construct from a different cancellation slot wrapper type.
+  template <typename U, typename OtherCancellationSlot>
+  cancellation_slot_binder(
+      cancellation_slot_binder<U, OtherCancellationSlot>&& other)
+    : slot_(BOOST_ASIO_MOVE_CAST(OtherCancellationSlot)(
+          other.get_cancellation_slot())),
+      target_(BOOST_ASIO_MOVE_CAST(U)(other.get()))
+  {
+  }
+
+  /// Move construct from a different cancellation slot wrapper type, but
+  /// specify a different cancellation slot.
+  template <typename U, typename OtherCancellationSlot>
+  cancellation_slot_binder(const cancellation_slot_type& s,
+      cancellation_slot_binder<U, OtherCancellationSlot>&& other)
+    : slot_(s),
+      target_(BOOST_ASIO_MOVE_CAST(U)(other.get()))
+  {
+  }
+
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Destructor.
+  ~cancellation_slot_binder()
+  {
+  }
+
+  /// Obtain a reference to the target object.
+  target_type& get() BOOST_ASIO_NOEXCEPT
+  {
+    return target_;
+  }
+
+  /// Obtain a reference to the target object.
+  const target_type& get() const BOOST_ASIO_NOEXCEPT
+  {
+    return target_;
+  }
+
+  /// Obtain the associated cancellation slot.
+  cancellation_slot_type get_cancellation_slot() const BOOST_ASIO_NOEXCEPT
+  {
+    return slot_;
+  }
+
+#if defined(GENERATING_DOCUMENTATION)
+
+  template <typename... Args> auto operator()(Args&& ...);
+  template <typename... Args> auto operator()(Args&& ...) const;
+
+#elif defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+  /// Forwarding function call operator.
+  template <typename... Args>
+  typename result_of<T(Args...)>::type operator()(
+      BOOST_ASIO_MOVE_ARG(Args)... args)
+  {
+    return target_(BOOST_ASIO_MOVE_CAST(Args)(args)...);
+  }
+
+  /// Forwarding function call operator.
+  template <typename... Args>
+  typename result_of<T(Args...)>::type operator()(
+      BOOST_ASIO_MOVE_ARG(Args)... args) const
+  {
+    return target_(BOOST_ASIO_MOVE_CAST(Args)(args)...);
+  }
+
+#elif defined(BOOST_ASIO_HAS_STD_TYPE_TRAITS) && !defined(_MSC_VER)
+
+  typename detail::cancellation_slot_binder_result_of0<T>::type operator()()
+  {
+    return target_();
+  }
+
+  typename detail::cancellation_slot_binder_result_of0<T>::type
+  operator()() const
+  {
+    return target_();
+  }
+
+#define BOOST_ASIO_PRIVATE_BINDER_CALL_DEF(n) \
+  template <BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+  typename result_of<T(BOOST_ASIO_VARIADIC_TARGS(n))>::type operator()( \
+      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
+  { \
+    return target_(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+  } \
+  \
+  template <BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+  typename result_of<T(BOOST_ASIO_VARIADIC_TARGS(n))>::type operator()( \
+      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+  { \
+    return target_(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+  } \
+  /**/
+  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_BINDER_CALL_DEF)
+#undef BOOST_ASIO_PRIVATE_BINDER_CALL_DEF
+
+#else // defined(BOOST_ASIO_HAS_STD_TYPE_TRAITS) && !defined(_MSC_VER)
+
+  typedef typename detail::cancellation_slot_binder_result_type<
+    T>::result_type_or_void result_type_or_void;
+
+  result_type_or_void operator()()
+  {
+    return target_();
+  }
+
+  result_type_or_void operator()() const
+  {
+    return target_();
+  }
+
+#define BOOST_ASIO_PRIVATE_BINDER_CALL_DEF(n) \
+  template <BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+  result_type_or_void operator()( \
+      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
+  { \
+    return target_(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+  } \
+  \
+  template <BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+  result_type_or_void operator()( \
+      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+  { \
+    return target_(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+  } \
+  /**/
+  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_BINDER_CALL_DEF)
+#undef BOOST_ASIO_PRIVATE_BINDER_CALL_DEF
+
+#endif // defined(BOOST_ASIO_HAS_STD_TYPE_TRAITS) && !defined(_MSC_VER)
+
+private:
+  CancellationSlot slot_;
+  T target_;
+};
+
+/// Associate an object of type @c T with a cancellation slot of type
+/// @c CancellationSlot.
+template <typename CancellationSlot, typename T>
+inline cancellation_slot_binder<typename decay<T>::type, CancellationSlot>
+bind_cancellation_slot(const CancellationSlot& s, BOOST_ASIO_MOVE_ARG(T) t)
+{
+  return cancellation_slot_binder<
+    typename decay<T>::type, CancellationSlot>(
+      s, BOOST_ASIO_MOVE_CAST(T)(t));
+}
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+namespace detail {
+
+template <typename TargetAsyncResult,
+  typename CancellationSlot, typename = void>
+struct cancellation_slot_binder_async_result_completion_handler_type
+{
+};
+
+template <typename TargetAsyncResult, typename CancellationSlot>
+struct cancellation_slot_binder_async_result_completion_handler_type<
+  TargetAsyncResult, CancellationSlot,
+  typename void_type<
+    typename TargetAsyncResult::completion_handler_type
+  >::type>
+{
+  typedef cancellation_slot_binder<
+    typename TargetAsyncResult::completion_handler_type, CancellationSlot>
+      completion_handler_type;
+};
+
+template <typename TargetAsyncResult, typename = void>
+struct cancellation_slot_binder_async_result_return_type
+{
+};
+
+template <typename TargetAsyncResult>
+struct cancellation_slot_binder_async_result_return_type<
+  TargetAsyncResult,
+  typename void_type<
+    typename TargetAsyncResult::return_type
+  >::type>
+{
+  typedef typename TargetAsyncResult::return_type return_type;
+};
+
+} // namespace detail
+
+template <typename T, typename CancellationSlot, typename Signature>
+class async_result<cancellation_slot_binder<T, CancellationSlot>, Signature> :
+  public detail::cancellation_slot_binder_async_result_completion_handler_type<
+    async_result<T, Signature>, CancellationSlot>,
+  public detail::cancellation_slot_binder_async_result_return_type<
+    async_result<T, Signature> >
+{
+public:
+  explicit async_result(cancellation_slot_binder<T, CancellationSlot>& b)
+    : target_(b.get())
+  {
+  }
+
+  typename async_result<T, Signature>::return_type get()
+  {
+    return target_.get();
+  }
+
+  template <typename Initiation>
+  struct init_wrapper
+  {
+    template <typename Init>
+    init_wrapper(const CancellationSlot& slot, BOOST_ASIO_MOVE_ARG(Init) init)
+      : slot_(slot),
+        initiation_(BOOST_ASIO_MOVE_CAST(Init)(init))
+    {
+    }
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+    template <typename Handler, typename... Args>
+    void operator()(
+        BOOST_ASIO_MOVE_ARG(Handler) handler,
+        BOOST_ASIO_MOVE_ARG(Args)... args)
+    {
+      BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)(
+          cancellation_slot_binder<
+            typename decay<Handler>::type, CancellationSlot>(
+              slot_, BOOST_ASIO_MOVE_CAST(Handler)(handler)),
+          BOOST_ASIO_MOVE_CAST(Args)(args)...);
+    }
+
+    template <typename Handler, typename... Args>
+    void operator()(
+        BOOST_ASIO_MOVE_ARG(Handler) handler,
+        BOOST_ASIO_MOVE_ARG(Args)... args) const
+    {
+      initiation_(
+          cancellation_slot_binder<
+            typename decay<Handler>::type, CancellationSlot>(
+              slot_, BOOST_ASIO_MOVE_CAST(Handler)(handler)),
+          BOOST_ASIO_MOVE_CAST(Args)(args)...);
+    }
+
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+    template <typename Handler>
+    void operator()(
+        BOOST_ASIO_MOVE_ARG(Handler) handler)
+    {
+      BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)(
+          cancellation_slot_binder<
+            typename decay<Handler>::type, CancellationSlot>(
+              slot_, BOOST_ASIO_MOVE_CAST(Handler)(handler)));
+    }
+
+    template <typename Handler>
+    void operator()(
+        BOOST_ASIO_MOVE_ARG(Handler) handler) const
+    {
+      initiation_(
+          cancellation_slot_binder<
+            typename decay<Handler>::type, CancellationSlot>(
+              slot_, BOOST_ASIO_MOVE_CAST(Handler)(handler)));
+    }
+
+#define BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF(n) \
+    template <typename Handler, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+    void operator()( \
+        BOOST_ASIO_MOVE_ARG(Handler) handler, \
+        BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
+    { \
+      BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)( \
+          cancellation_slot_binder< \
+            typename decay<Handler>::type, CancellationSlot>( \
+              slot_, BOOST_ASIO_MOVE_CAST(Handler)(handler)), \
+          BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+    } \
+    \
+    template <typename Handler, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+    void operator()( \
+        BOOST_ASIO_MOVE_ARG(Handler) handler, \
+        BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+    { \
+      initiation_( \
+          cancellation_slot_binder< \
+            typename decay<Handler>::type, CancellationSlot>( \
+              slot_, BOOST_ASIO_MOVE_CAST(Handler)(handler)), \
+          BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+    } \
+    /**/
+    BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF)
+#undef BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF
+
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+    CancellationSlot slot_;
+    Initiation initiation_;
+  };
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+  template <typename Initiation, typename RawCompletionToken, typename... Args>
+  static BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(T, Signature,
+    (async_result<T, Signature>::initiate(
+        declval<init_wrapper<typename decay<Initiation>::type> >(),
+        declval<T>(), declval<BOOST_ASIO_MOVE_ARG(Args)>()...)))
+  initiate(
+      BOOST_ASIO_MOVE_ARG(Initiation) initiation,
+      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token,
+      BOOST_ASIO_MOVE_ARG(Args)... args)
+  {
+    return async_initiate<T, Signature>(
+        init_wrapper<typename decay<Initiation>::type>(
+          token.get_cancellation_slot(),
+          BOOST_ASIO_MOVE_CAST(Initiation)(initiation)),
+        token.get(), BOOST_ASIO_MOVE_CAST(Args)(args)...);
+  }
+
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+  template <typename Initiation, typename RawCompletionToken>
+  static BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(T, Signature,
+    (async_result<T, Signature>::initiate(
+        declval<init_wrapper<typename decay<Initiation>::type> >(),
+        declval<T>())))
+  initiate(
+      BOOST_ASIO_MOVE_ARG(Initiation) initiation,
+      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token)
+  {
+    return async_initiate<T, Signature>(
+        init_wrapper<typename decay<Initiation>::type>(
+          token.get_cancellation_slot(),
+          BOOST_ASIO_MOVE_CAST(Initiation)(initiation)),
+        token.get());
+  }
+
+#define BOOST_ASIO_PRIVATE_INITIATE_DEF(n) \
+  template <typename Initiation, typename RawCompletionToken, \
+      BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+  static BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(T, Signature, \
+    (async_result<T, Signature>::initiate( \
+        declval<init_wrapper<typename decay<Initiation>::type> >(), \
+        declval<T>(), BOOST_ASIO_VARIADIC_MOVE_DECLVAL(n)))) \
+  initiate( \
+      BOOST_ASIO_MOVE_ARG(Initiation) initiation, \
+      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token, \
+      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
+  { \
+    return async_initiate<T, Signature>( \
+        init_wrapper<typename decay<Initiation>::type>( \
+          token.get_cancellation_slot(), \
+          BOOST_ASIO_MOVE_CAST(Initiation)(initiation)), \
+        token.get(), BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+  } \
+  /**/
+  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INITIATE_DEF)
+#undef BOOST_ASIO_PRIVATE_INITIATE_DEF
+
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+private:
+  async_result(const async_result&) BOOST_ASIO_DELETED;
+  async_result& operator=(const async_result&) BOOST_ASIO_DELETED;
+
+  async_result<T, Signature> target_;
+};
+
+template <template <typename, typename> class Associator,
+    typename T, typename CancellationSlot, typename DefaultCandidate>
+struct associator<Associator,
+    cancellation_slot_binder<T, CancellationSlot>,
+    DefaultCandidate>
+{
+  typedef typename Associator<T, DefaultCandidate>::type type;
+
+  static type get(const cancellation_slot_binder<T, CancellationSlot>& b,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
+  {
+    return Associator<T, DefaultCandidate>::get(b.get(), c);
+  }
+};
+
+template <typename T, typename CancellationSlot, typename CancellationSlot1>
+struct associated_cancellation_slot<
+    cancellation_slot_binder<T, CancellationSlot>,
+    CancellationSlot1>
+{
+  typedef CancellationSlot type;
+
+  static type get(const cancellation_slot_binder<T, CancellationSlot>& b,
+      const CancellationSlot1& = CancellationSlot1()) BOOST_ASIO_NOEXCEPT
+  {
+    return b.get_cancellation_slot();
+  }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_BIND_CANCELLATION_SLOT_HPP

sources/boost/asio/bind_executor.hpp

@@ -2,7 +2,7 @@
 // bind_executor.hpp
 // ~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -19,7 +19,7 @@
 #include <boost/asio/detail/type_traits.hpp>
 #include <boost/asio/detail/variadic_templates.hpp>
 #include <boost/asio/associated_executor.hpp>
-#include <boost/asio/associated_allocator.hpp>
+#include <boost/asio/associator.hpp>
 #include <boost/asio/async_result.hpp>
 #include <boost/asio/execution/executor.hpp>
 #include <boost/asio/execution_context.hpp>
@@ -489,9 +489,9 @@ private:
 template <typename Executor, typename T>
 inline executor_binder<typename decay<T>::type, Executor>
 bind_executor(const Executor& ex, BOOST_ASIO_MOVE_ARG(T) t,
-    typename enable_if<
+    typename constraint<
       is_executor<Executor>::value || execution::is_executor<Executor>::value
-    >::type* = 0)
+    >::type = 0)
 {
   return executor_binder<typename decay<T>::type, Executor>(
       executor_arg_t(), ex, BOOST_ASIO_MOVE_CAST(T)(t));
@@ -502,8 +502,8 @@ template <typename ExecutionContext, typename T>
 inline executor_binder<typename decay<T>::type,
   typename ExecutionContext::executor_type>
 bind_executor(ExecutionContext& ctx, BOOST_ASIO_MOVE_ARG(T) t,
-    typename enable_if<is_convertible<
+    typename constraint<is_convertible<
-      ExecutionContext&, execution_context&>::value>::type* = 0)
+      ExecutionContext&, execution_context&>::value>::type = 0)
 {
   return executor_binder<typename decay<T>::type,
     typename ExecutionContext::executor_type>(
@@ -516,42 +516,235 @@ template <typename T, typename Executor>
 struct uses_executor<executor_binder<T, Executor>, Executor>
   : true_type {};
 
-template <typename T, typename Executor, typename Signature>
+namespace detail {
-class async_result<executor_binder<T, Executor>, Signature>
+
+template <typename TargetAsyncResult, typename Executor, typename = void>
+class executor_binder_completion_handler_async_result
+{
+public:
+  template <typename T>
+  explicit executor_binder_completion_handler_async_result(T&)
+  {
+  }
+};
+
+template <typename TargetAsyncResult, typename Executor>
+class executor_binder_completion_handler_async_result<
+  TargetAsyncResult, Executor,
+  typename void_type<
+    typename TargetAsyncResult::completion_handler_type
+  >::type>
 {
 public:
   typedef executor_binder<
-    typename async_result<T, Signature>::completion_handler_type, Executor>
+    typename TargetAsyncResult::completion_handler_type, Executor>
       completion_handler_type;
 
-  typedef typename async_result<T, Signature>::return_type return_type;
+  explicit executor_binder_completion_handler_async_result(
-
+      typename TargetAsyncResult::completion_handler_type& handler)
-  explicit async_result(executor_binder<T, Executor>& b)
+    : target_(handler)
-    : target_(b.get())
   {
   }
 
-  return_type get()
+  typename TargetAsyncResult::return_type get()
   {
     return target_.get();
   }
 
 private:
-  async_result(const async_result&) BOOST_ASIO_DELETED;
+  TargetAsyncResult target_;
-  async_result& operator=(const async_result&) BOOST_ASIO_DELETED;
-
-  async_result<T, Signature> target_;
 };
 
-template <typename T, typename Executor, typename Allocator>
+template <typename TargetAsyncResult, typename = void>
-struct associated_allocator<executor_binder<T, Executor>, Allocator>
+struct executor_binder_async_result_return_type
 {
-  typedef typename associated_allocator<T, Allocator>::type type;
+};
+
+template <typename TargetAsyncResult>
+struct executor_binder_async_result_return_type<
+  TargetAsyncResult,
+  typename void_type<
+    typename TargetAsyncResult::return_type
+  >::type>
+{
+  typedef typename TargetAsyncResult::return_type return_type;
+};
+
+} // namespace detail
+
+template <typename T, typename Executor, typename Signature>
+class async_result<executor_binder<T, Executor>, Signature> :
+  public detail::executor_binder_completion_handler_async_result<
+    async_result<T, Signature>, Executor>,
+  public detail::executor_binder_async_result_return_type<
+    async_result<T, Signature> >
+{
+public:
+  explicit async_result(executor_binder<T, Executor>& b)
+    : detail::executor_binder_completion_handler_async_result<
+        async_result<T, Signature>, Executor>(b.get())
+  {
+  }
+
+  template <typename Initiation>
+  struct init_wrapper
+  {
+    template <typename Init>
+    init_wrapper(const Executor& ex, BOOST_ASIO_MOVE_ARG(Init) init)
+      : ex_(ex),
+        initiation_(BOOST_ASIO_MOVE_CAST(Init)(init))
+    {
+    }
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+    template <typename Handler, typename... Args>
+    void operator()(
+        BOOST_ASIO_MOVE_ARG(Handler) handler,
+        BOOST_ASIO_MOVE_ARG(Args)... args)
+    {
+      BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)(
+          executor_binder<typename decay<Handler>::type, Executor>(
+            executor_arg_t(), ex_, BOOST_ASIO_MOVE_CAST(Handler)(handler)),
+          BOOST_ASIO_MOVE_CAST(Args)(args)...);
+    }
+
+    template <typename Handler, typename... Args>
+    void operator()(
+        BOOST_ASIO_MOVE_ARG(Handler) handler,
+        BOOST_ASIO_MOVE_ARG(Args)... args) const
+    {
+      initiation_(
+          executor_binder<typename decay<Handler>::type, Executor>(
+            executor_arg_t(), ex_, BOOST_ASIO_MOVE_CAST(Handler)(handler)),
+          BOOST_ASIO_MOVE_CAST(Args)(args)...);
+    }
+
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+    template <typename Handler>
+    void operator()(
+        BOOST_ASIO_MOVE_ARG(Handler) handler)
+    {
+      BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)(
+          executor_binder<typename decay<Handler>::type, Executor>(
+            executor_arg_t(), ex_, BOOST_ASIO_MOVE_CAST(Handler)(handler)));
+    }
+
+    template <typename Handler>
+    void operator()(
+        BOOST_ASIO_MOVE_ARG(Handler) handler) const
+    {
+      initiation_(
+          executor_binder<typename decay<Handler>::type, Executor>(
+            executor_arg_t(), ex_, BOOST_ASIO_MOVE_CAST(Handler)(handler)));
+    }
+
+#define BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF(n) \
+    template <typename Handler, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+    void operator()( \
+        BOOST_ASIO_MOVE_ARG(Handler) handler, \
+        BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
+    { \
+      BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)( \
+          executor_binder<typename decay<Handler>::type, Executor>( \
+            executor_arg_t(), ex_, BOOST_ASIO_MOVE_CAST(Handler)(handler)), \
+          BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+    } \
+    \
+    template <typename Handler, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+    void operator()( \
+        BOOST_ASIO_MOVE_ARG(Handler) handler, \
+        BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+    { \
+      initiation_( \
+          executor_binder<typename decay<Handler>::type, Executor>( \
+            executor_arg_t(), ex_, BOOST_ASIO_MOVE_CAST(Handler)(handler)), \
+          BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+    } \
+    /**/
+    BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF)
+#undef BOOST_ASIO_PRIVATE_INIT_WRAPPER_DEF
+
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+    Executor ex_;
+    Initiation initiation_;
+  };
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+  template <typename Initiation, typename RawCompletionToken, typename... Args>
+  static BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(T, Signature,
+    (async_result<T, Signature>::initiate(
+        declval<init_wrapper<typename decay<Initiation>::type> >(),
+        declval<T>(), declval<BOOST_ASIO_MOVE_ARG(Args)>()...)))
+  initiate(
+      BOOST_ASIO_MOVE_ARG(Initiation) initiation,
+      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token,
+      BOOST_ASIO_MOVE_ARG(Args)... args)
+  {
+    return async_initiate<T, Signature>(
+        init_wrapper<typename decay<Initiation>::type>(
+          token.get_executor(), BOOST_ASIO_MOVE_CAST(Initiation)(initiation)),
+        token.get(), BOOST_ASIO_MOVE_CAST(Args)(args)...);
+  }
+
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+  template <typename Initiation, typename RawCompletionToken>
+  static BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(T, Signature,
+    (async_result<T, Signature>::initiate(
+        declval<init_wrapper<typename decay<Initiation>::type> >(),
+        declval<T>())))
+  initiate(
+      BOOST_ASIO_MOVE_ARG(Initiation) initiation,
+      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token)
+  {
+    return async_initiate<T, Signature>(
+        init_wrapper<typename decay<Initiation>::type>(
+          token.get_executor(), BOOST_ASIO_MOVE_CAST(Initiation)(initiation)),
+        token.get());
+  }
+
+#define BOOST_ASIO_PRIVATE_INITIATE_DEF(n) \
+  template <typename Initiation, typename RawCompletionToken, \
+      BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+  static BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(T, Signature, \
+    (async_result<T, Signature>::initiate( \
+        declval<init_wrapper<typename decay<Initiation>::type> >(), \
+        declval<T>(), BOOST_ASIO_VARIADIC_MOVE_DECLVAL(n)))) \
+  initiate( \
+      BOOST_ASIO_MOVE_ARG(Initiation) initiation, \
+      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token, \
+      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
+  { \
+    return async_initiate<T, Signature>( \
+        init_wrapper<typename decay<Initiation>::type>( \
+          token.get_executor(), BOOST_ASIO_MOVE_CAST(Initiation)(initiation)), \
+        token.get(), BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+  } \
+  /**/
+  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INITIATE_DEF)
+#undef BOOST_ASIO_PRIVATE_INITIATE_DEF
+
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+private:
+  async_result(const async_result&) BOOST_ASIO_DELETED;
+  async_result& operator=(const async_result&) BOOST_ASIO_DELETED;
+};
+
+template <template <typename, typename> class Associator,
+    typename T, typename Executor, typename DefaultCandidate>
+struct associator<Associator, executor_binder<T, Executor>, DefaultCandidate>
+{
+  typedef typename Associator<T, DefaultCandidate>::type type;
 
   static type get(const executor_binder<T, Executor>& b,
-      const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
   {
-    return associated_allocator<T, Allocator>::get(b.get(), a);
+    return Associator<T, DefaultCandidate>::get(b.get(), c);
   }
 };
 

sources/boost/asio/buffer.hpp

@@ -2,7 +2,7 @@
 // buffer.hpp
 // ~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -387,9 +387,9 @@ private:
 /// Get an iterator to the first element in a buffer sequence.
 template <typename MutableBuffer>
 inline const mutable_buffer* buffer_sequence_begin(const MutableBuffer& b,
-    typename enable_if<
+    typename constraint<
       is_convertible<const MutableBuffer*, const mutable_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return static_cast<const mutable_buffer*>(detail::addressof(b));
 }
@@ -397,9 +397,9 @@ inline const mutable_buffer* buffer_sequence_begin(const MutableBuffer& b,
 /// Get an iterator to the first element in a buffer sequence.
 template <typename ConstBuffer>
 inline const const_buffer* buffer_sequence_begin(const ConstBuffer& b,
-    typename enable_if<
+    typename constraint<
       is_convertible<const ConstBuffer*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return static_cast<const const_buffer*>(detail::addressof(b));
 }
@@ -409,10 +409,10 @@ inline const const_buffer* buffer_sequence_begin(const ConstBuffer& b,
 /// Get an iterator to the first element in a buffer sequence.
 template <typename C>
 inline auto buffer_sequence_begin(C& c,
-    typename enable_if<
+    typename constraint<
       !is_convertible<const C*, const mutable_buffer*>::value
         && !is_convertible<const C*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT -> decltype(c.begin())
+    >::type = 0) BOOST_ASIO_NOEXCEPT -> decltype(c.begin())
 {
   return c.begin();
 }
@@ -420,10 +420,10 @@ inline auto buffer_sequence_begin(C& c,
 /// Get an iterator to the first element in a buffer sequence.
 template <typename C>
 inline auto buffer_sequence_begin(const C& c,
-    typename enable_if<
+    typename constraint<
       !is_convertible<const C*, const mutable_buffer*>::value
         && !is_convertible<const C*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT -> decltype(c.begin())
+    >::type = 0) BOOST_ASIO_NOEXCEPT -> decltype(c.begin())
 {
   return c.begin();
 }
@@ -432,20 +432,20 @@ inline auto buffer_sequence_begin(const C& c,
 
 template <typename C>
 inline typename C::iterator buffer_sequence_begin(C& c,
-    typename enable_if<
+    typename constraint<
       !is_convertible<const C*, const mutable_buffer*>::value
         && !is_convertible<const C*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return c.begin();
 }
 
 template <typename C>
 inline typename C::const_iterator buffer_sequence_begin(const C& c,
-    typename enable_if<
+    typename constraint<
       !is_convertible<const C*, const mutable_buffer*>::value
         && !is_convertible<const C*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return c.begin();
 }
@@ -464,9 +464,9 @@ inline typename C::const_iterator buffer_sequence_begin(const C& c,
 /// Get an iterator to one past the end element in a buffer sequence.
 template <typename MutableBuffer>
 inline const mutable_buffer* buffer_sequence_end(const MutableBuffer& b,
-    typename enable_if<
+    typename constraint<
       is_convertible<const MutableBuffer*, const mutable_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return static_cast<const mutable_buffer*>(detail::addressof(b)) + 1;
 }
@@ -474,9 +474,9 @@ inline const mutable_buffer* buffer_sequence_end(const MutableBuffer& b,
 /// Get an iterator to one past the end element in a buffer sequence.
 template <typename ConstBuffer>
 inline const const_buffer* buffer_sequence_end(const ConstBuffer& b,
-    typename enable_if<
+    typename constraint<
       is_convertible<const ConstBuffer*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return static_cast<const const_buffer*>(detail::addressof(b)) + 1;
 }
@@ -486,10 +486,10 @@ inline const const_buffer* buffer_sequence_end(const ConstBuffer& b,
 /// Get an iterator to one past the end element in a buffer sequence.
 template <typename C>
 inline auto buffer_sequence_end(C& c,
-    typename enable_if<
+    typename constraint<
       !is_convertible<const C*, const mutable_buffer*>::value
         && !is_convertible<const C*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT -> decltype(c.end())
+    >::type = 0) BOOST_ASIO_NOEXCEPT -> decltype(c.end())
 {
   return c.end();
 }
@@ -497,10 +497,10 @@ inline auto buffer_sequence_end(C& c,
 /// Get an iterator to one past the end element in a buffer sequence.
 template <typename C>
 inline auto buffer_sequence_end(const C& c,
-    typename enable_if<
+    typename constraint<
       !is_convertible<const C*, const mutable_buffer*>::value
         && !is_convertible<const C*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT -> decltype(c.end())
+    >::type = 0) BOOST_ASIO_NOEXCEPT -> decltype(c.end())
 {
   return c.end();
 }
@@ -509,20 +509,20 @@ inline auto buffer_sequence_end(const C& c,
 
 template <typename C>
 inline typename C::iterator buffer_sequence_end(C& c,
-    typename enable_if<
+    typename constraint<
       !is_convertible<const C*, const mutable_buffer*>::value
         && !is_convertible<const C*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return c.end();
 }
 
 template <typename C>
 inline typename C::const_iterator buffer_sequence_end(const C& c,
-    typename enable_if<
+    typename constraint<
       !is_convertible<const C*, const mutable_buffer*>::value
         && !is_convertible<const C*, const const_buffer*>::value
-    >::type* = 0) BOOST_ASIO_NOEXCEPT
+    >::type = 0) BOOST_ASIO_NOEXCEPT
 {
   return c.end();
 }

sources/boost/asio/buffer_registration.hpp

@@ -0,0 +1,330 @@
+//
+// buffer_registration.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_BUFFER_REGISTRATION_HPP
+#define BOOST_ASIO_BUFFER_REGISTRATION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <iterator>
+#include <vector>
+#include <boost/asio/detail/memory.hpp>
+#include <boost/asio/execution/context.hpp>
+#include <boost/asio/execution/executor.hpp>
+#include <boost/asio/execution_context.hpp>
+#include <boost/asio/is_executor.hpp>
+#include <boost/asio/query.hpp>
+#include <boost/asio/registered_buffer.hpp>
+
+#if defined(BOOST_ASIO_HAS_IO_URING)
+# include <boost/asio/detail/scheduler.hpp>
+# include <boost/asio/detail/io_uring_service.hpp>
+#endif // defined(BOOST_ASIO_HAS_IO_URING)
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+# include <utility>
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class buffer_registration_base
+{
+protected:
+  static mutable_registered_buffer make_buffer(const mutable_buffer& b,
+      const void* scope, int index) BOOST_ASIO_NOEXCEPT
+  {
+    return mutable_registered_buffer(b, registered_buffer_id(scope, index));
+  }
+};
+
+} // namespace detail
+
+/// Automatically registers and unregistered buffers with an execution context.
+/**
+ * For portability, applications should assume that only one registration is
+ * permitted per execution context.
+ */
+template <typename MutableBufferSequence,
+    typename Allocator = std::allocator<void> >
+class buffer_registration
+  : detail::buffer_registration_base
+{
+public:
+  /// The allocator type used for allocating storage for the buffers container.
+  typedef Allocator allocator_type;
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// The type of an iterator over the registered buffers.
+  typedef unspecified iterator;
+
+  /// The type of a const iterator over the registered buffers.
+  typedef unspecified const_iterator;
+#else // defined(GENERATING_DOCUMENTATION)
+  typedef std::vector<mutable_registered_buffer>::const_iterator iterator;
+  typedef std::vector<mutable_registered_buffer>::const_iterator const_iterator;
+#endif // defined(GENERATING_DOCUMENTATION)
+
+  /// Register buffers with an executor's execution context.
+  template <typename Executor>
+  buffer_registration(const Executor& ex,
+      const MutableBufferSequence& buffer_sequence,
+      const allocator_type& alloc = allocator_type(),
+      typename constraint<
+        is_executor<Executor>::value || execution::is_executor<Executor>::value
+      >::type = 0)
+    : buffer_sequence_(buffer_sequence),
+      buffers_(
+          BOOST_ASIO_REBIND_ALLOC(allocator_type,
+            mutable_registered_buffer)(alloc))
+  {
+    init_buffers(buffer_registration::get_context(ex),
+        boost::asio::buffer_sequence_begin(buffer_sequence_),
+        boost::asio::buffer_sequence_end(buffer_sequence_));
+  }
+
+  /// Register buffers with an execution context.
+  template <typename ExecutionContext>
+  buffer_registration(ExecutionContext& ctx,
+      const MutableBufferSequence& buffer_sequence,
+      const allocator_type& alloc = allocator_type(),
+      typename constraint<
+        is_convertible<ExecutionContext&, execution_context&>::value
+      >::type = 0)
+    : buffer_sequence_(buffer_sequence),
+      buffers_(
+          BOOST_ASIO_REBIND_ALLOC(allocator_type,
+            mutable_registered_buffer)(alloc))
+  {
+    init_buffers(ctx,
+        boost::asio::buffer_sequence_begin(buffer_sequence_),
+        boost::asio::buffer_sequence_end(buffer_sequence_));
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move constructor.
+  buffer_registration(buffer_registration&& other) BOOST_ASIO_NOEXCEPT
+    : buffer_sequence_(std::move(other.buffer_sequence_)),
+      buffers_(std::move(other.buffers_))
+  {
+#if defined(BOOST_ASIO_HAS_IO_URING)
+    service_ = other.service_;
+    other.service_ = 0;
+#endif // defined(BOOST_ASIO_HAS_IO_URING)
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Unregisters the buffers.
+  ~buffer_registration()
+  {
+#if defined(BOOST_ASIO_HAS_IO_URING)
+    if (service_)
+      service_->unregister_buffers();
+#endif // defined(BOOST_ASIO_HAS_IO_URING)
+  }
+  
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move assignment.
+  buffer_registration& operator=(
+      buffer_registration&& other) BOOST_ASIO_NOEXCEPT
+  {
+    if (this != &other)
+    {
+      buffer_sequence_ = std::move(other.buffer_sequence_);
+      buffers_ = std::move(other.buffers_);
+#if defined(BOOST_ASIO_HAS_IO_URING)
+      if (service_)
+        service_->unregister_buffers();
+      service_ = other.service_;
+      other.service_ = 0;
+#endif // defined(BOOST_ASIO_HAS_IO_URING)
+    }
+    return *this;
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Get the number of registered buffers.
+  std::size_t size() const BOOST_ASIO_NOEXCEPT
+  {
+    return buffers_.size();
+  }
+
+  /// Get the begin iterator for the sequence of registered buffers.
+  const_iterator begin() const BOOST_ASIO_NOEXCEPT
+  {
+    return buffers_.begin();
+  }
+
+  /// Get the begin iterator for the sequence of registered buffers.
+  const_iterator cbegin() const BOOST_ASIO_NOEXCEPT
+  {
+    return buffers_.cbegin();
+  }
+
+  /// Get the end iterator for the sequence of registered buffers.
+  const_iterator end() const BOOST_ASIO_NOEXCEPT
+  {
+    return buffers_.end();
+  }
+
+  /// Get the end iterator for the sequence of registered buffers.
+  const_iterator cend() const BOOST_ASIO_NOEXCEPT
+  {
+    return buffers_.cend();
+  }
+
+  /// Get the buffer at the specified index.
+  const mutable_registered_buffer& operator[](std::size_t i) BOOST_ASIO_NOEXCEPT
+  {
+    return buffers_[i];
+  }
+
+  /// Get the buffer at the specified index.
+  const mutable_registered_buffer& at(std::size_t i) BOOST_ASIO_NOEXCEPT
+  {
+    return buffers_.at(i);
+  }
+
+private:
+  // Disallow copying and assignment.
+  buffer_registration(const buffer_registration&) BOOST_ASIO_DELETED;
+  buffer_registration& operator=(const buffer_registration&) BOOST_ASIO_DELETED;
+
+  // Helper function to get an executor's context.
+  template <typename T>
+  static execution_context& get_context(const T& t,
+      typename enable_if<execution::is_executor<T>::value>::type* = 0)
+  {
+    return boost::asio::query(t, execution::context);
+  }
+
+  // Helper function to get an executor's context.
+  template <typename T>
+  static execution_context& get_context(const T& t,
+      typename enable_if<!execution::is_executor<T>::value>::type* = 0)
+  {
+    return t.context();
+  }
+
+  // Helper function to initialise the container of buffers.
+  template <typename Iterator>
+  void init_buffers(execution_context& ctx, Iterator begin, Iterator end)
+  {
+    std::size_t n = std::distance(begin, end);
+    buffers_.resize(n);
+
+#if defined(BOOST_ASIO_HAS_IO_URING)
+    service_ = &use_service<detail::io_uring_service>(ctx);
+    std::vector<iovec,
+      BOOST_ASIO_REBIND_ALLOC(allocator_type, iovec)> iovecs(n,
+          BOOST_ASIO_REBIND_ALLOC(allocator_type, iovec)(
+            buffers_.get_allocator()));
+#endif // defined(BOOST_ASIO_HAS_IO_URING)
+
+    Iterator iter = begin;
+    for (int index = 0; iter != end; ++index, ++iter)
+    {
+      mutable_buffer b(*iter);
+      std::size_t i = static_cast<std::size_t>(index);
+      buffers_[i] = this->make_buffer(b, &ctx, index);
+
+#if defined(BOOST_ASIO_HAS_IO_URING)
+      iovecs[i].iov_base = buffers_[i].data();
+      iovecs[i].iov_len = buffers_[i].size();
+#endif // defined(BOOST_ASIO_HAS_IO_URING)
+    }
+
+#if defined(BOOST_ASIO_HAS_IO_URING)
+    if (n > 0)
+    {
+      service_->register_buffers(&iovecs[0],
+          static_cast<unsigned>(iovecs.size()));
+    }
+#endif // defined(BOOST_ASIO_HAS_IO_URING)
+  }
+
+  MutableBufferSequence buffer_sequence_;
+  std::vector<mutable_registered_buffer,
+    BOOST_ASIO_REBIND_ALLOC(allocator_type,
+      mutable_registered_buffer)> buffers_;
+#if defined(BOOST_ASIO_HAS_IO_URING)
+  detail::io_uring_service* service_;
+#endif // defined(BOOST_ASIO_HAS_IO_URING)
+};
+
+#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+/// Register buffers with an execution context.
+template <typename Executor, typename MutableBufferSequence>
+BOOST_ASIO_NODISCARD inline
+buffer_registration<MutableBufferSequence>
+register_buffers(const Executor& ex,
+    const MutableBufferSequence& buffer_sequence,
+    typename constraint<
+      is_executor<Executor>::value || execution::is_executor<Executor>::value
+    >::type = 0)
+{
+  return buffer_registration<MutableBufferSequence>(ex, buffer_sequence);
+}
+
+/// Register buffers with an execution context.
+template <typename Executor, typename MutableBufferSequence, typename Allocator>
+BOOST_ASIO_NODISCARD inline
+buffer_registration<MutableBufferSequence, Allocator>
+register_buffers(const Executor& ex,
+    const MutableBufferSequence& buffer_sequence, const Allocator& alloc,
+    typename constraint<
+      is_executor<Executor>::value || execution::is_executor<Executor>::value
+    >::type = 0)
+{
+  return buffer_registration<MutableBufferSequence, Allocator>(
+      ex, buffer_sequence, alloc);
+}
+
+/// Register buffers with an execution context.
+template <typename ExecutionContext, typename MutableBufferSequence>
+BOOST_ASIO_NODISCARD inline
+buffer_registration<MutableBufferSequence>
+register_buffers(ExecutionContext& ctx,
+    const MutableBufferSequence& buffer_sequence,
+    typename constraint<
+      is_convertible<ExecutionContext&, execution_context&>::value
+    >::type = 0)
+{
+  return buffer_registration<MutableBufferSequence>(ctx, buffer_sequence);
+}
+
+/// Register buffers with an execution context.
+template <typename ExecutionContext,
+    typename MutableBufferSequence, typename Allocator>
+BOOST_ASIO_NODISCARD inline
+buffer_registration<MutableBufferSequence, Allocator>
+register_buffers(ExecutionContext& ctx,
+    const MutableBufferSequence& buffer_sequence, const Allocator& alloc,
+    typename constraint<
+      is_convertible<ExecutionContext&, execution_context&>::value
+    >::type = 0)
+{
+  return buffer_registration<MutableBufferSequence, Allocator>(
+      ctx, buffer_sequence, alloc);
+}
+#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_BUFFER_REGISTRATION_HPP

sources/boost/asio/buffered_read_stream.hpp

@@ -2,7 +2,7 @@
 // buffered_read_stream.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/buffered_read_stream_fwd.hpp

@@ -2,7 +2,7 @@
 // buffered_read_stream_fwd.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/buffered_stream.hpp

@@ -2,7 +2,7 @@
 // buffered_stream.hpp
 // ~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/buffered_stream_fwd.hpp

@@ -2,7 +2,7 @@
 // buffered_stream_fwd.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/buffered_write_stream.hpp

@@ -2,7 +2,7 @@
 // buffered_write_stream.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/buffered_write_stream_fwd.hpp

@@ -2,7 +2,7 @@
 // buffered_write_stream_fwd.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/buffers_iterator.hpp

@@ -2,7 +2,7 @@
 // buffers_iterator.hpp
 // ~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/cancellation_signal.hpp

@@ -0,0 +1,307 @@
+//
+// cancellation_signal.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_CANCELLATION_SIGNAL_HPP
+#define BOOST_ASIO_CANCELLATION_SIGNAL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <cassert>
+#include <new>
+#include <utility>
+#include <boost/asio/cancellation_type.hpp>
+#include <boost/asio/detail/cstddef.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/detail/variadic_templates.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class cancellation_handler_base
+{
+public:
+  virtual void call(cancellation_type_t) = 0;
+  virtual std::pair<void*, std::size_t> destroy() BOOST_ASIO_NOEXCEPT = 0;
+
+protected:
+  ~cancellation_handler_base() {}
+};
+
+template <typename Handler>
+class cancellation_handler
+  : public cancellation_handler_base
+{
+public:
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+  template <typename... Args>
+  cancellation_handler(std::size_t size, BOOST_ASIO_MOVE_ARG(Args)... args)
+    : handler_(BOOST_ASIO_MOVE_CAST(Args)(args)...),
+      size_(size)
+  {
+  }
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+  cancellation_handler(std::size_t size)
+    : handler_(),
+      size_(size)
+  {
+  }
+
+#define BOOST_ASIO_PRIVATE_HANDLER_CTOR_DEF(n) \
+  template <BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+  cancellation_handler(std::size_t size, BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
+    : handler_(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)), \
+      size_(size) \
+  { \
+  } \
+  /**/
+  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_HANDLER_CTOR_DEF)
+#undef BOOST_ASIO_PRIVATE_HANDLER_CTOR_DEF
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+  void call(cancellation_type_t type)
+  {
+    handler_(type);
+  }
+
+  std::pair<void*, std::size_t> destroy() BOOST_ASIO_NOEXCEPT
+  {
+    std::pair<void*, std::size_t> mem(this, size_);
+    this->cancellation_handler::~cancellation_handler();
+    return mem;
+  }
+
+  Handler& handler() BOOST_ASIO_NOEXCEPT
+  {
+    return handler_;
+  }
+
+private:
+  ~cancellation_handler()
+  {
+  }
+
+  Handler handler_;
+  std::size_t size_;
+};
+
+} // namespace detail
+
+class cancellation_slot;
+
+/// A cancellation signal with a single slot.
+class cancellation_signal
+{
+public:
+  BOOST_ASIO_CONSTEXPR cancellation_signal()
+    : handler_(0)
+  {
+  }
+
+  BOOST_ASIO_DECL ~cancellation_signal();
+
+  /// Emits the signal and causes invocation of the slot's handler, if any.
+  void emit(cancellation_type_t type)
+  {
+    if (handler_)
+      handler_->call(type);
+  }
+
+  /// Returns the single slot associated with the signal.
+  /**
+   * The signal object must remain valid for as long the slot may be used.
+   * Destruction of the signal invalidates the slot.
+   */
+  cancellation_slot slot() BOOST_ASIO_NOEXCEPT;
+
+private:
+  cancellation_signal(const cancellation_signal&) BOOST_ASIO_DELETED;
+  cancellation_signal& operator=(const cancellation_signal&) BOOST_ASIO_DELETED;
+
+  detail::cancellation_handler_base* handler_;
+};
+
+/// A slot associated with a cancellation signal.
+class cancellation_slot
+{
+public:
+  /// Creates a slot that is not connected to any cancellation signal.
+  BOOST_ASIO_CONSTEXPR cancellation_slot()
+    : handler_(0)
+  {
+  }
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES) \
+  || defined(GENERATING_DOCUMENTATION)
+  /// Installs a handler into the slot, constructing the new object directly.
+  /**
+   * Destroys any existing handler in the slot, then installs the new handler,
+   * constructing it with the supplied @c args.
+   *
+   * The handler is a function object to be called when the signal is emitted.
+   * The signature of the handler must be
+   * @code void handler(boost::asio::cancellation_type_t); @endcode
+   *
+   * @param args Arguments to be passed to the @c CancellationHandler object's
+   * constructor.
+   *
+   * @returns A reference to the newly installed handler.
+   *
+   * @note Handlers installed into the slot via @c emplace are not required to
+   * be copy constructible or move constructible.
+   */
+  template <typename CancellationHandler, typename... Args>
+  CancellationHandler& emplace(BOOST_ASIO_MOVE_ARG(Args)... args)
+  {
+    typedef detail::cancellation_handler<CancellationHandler>
+      cancellation_handler_type;
+    auto_delete_helper del = { prepare_memory(
+        sizeof(cancellation_handler_type),
+        BOOST_ASIO_ALIGNOF(CancellationHandler)) };
+    cancellation_handler_type* handler_obj =
+      new (del.mem.first) cancellation_handler_type(
+        del.mem.second, BOOST_ASIO_MOVE_CAST(Args)(args)...);
+    del.mem.first = 0;
+    *handler_ = handler_obj;
+    return handler_obj->handler();
+  }
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+      //   || defined(GENERATING_DOCUMENTATION)
+  template <typename CancellationHandler>
+  CancellationHandler& emplace()
+  {
+    typedef detail::cancellation_handler<CancellationHandler>
+      cancellation_handler_type;
+    auto_delete_helper del = { prepare_memory(
+        sizeof(cancellation_handler_type),
+        BOOST_ASIO_ALIGNOF(CancellationHandler)) };
+    cancellation_handler_type* handler_obj =
+      new (del.mem.first) cancellation_handler_type(del.mem.second);
+    del.mem.first = 0;
+    *handler_ = handler_obj;
+    return handler_obj->handler();
+  }
+
+#define BOOST_ASIO_PRIVATE_HANDLER_EMPLACE_DEF(n) \
+  template <typename CancellationHandler, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+  CancellationHandler& emplace(BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
+  { \
+    typedef detail::cancellation_handler<CancellationHandler> \
+      cancellation_handler_type; \
+    auto_delete_helper del = { prepare_memory( \
+        sizeof(cancellation_handler_type), \
+        BOOST_ASIO_ALIGNOF(CancellationHandler)) }; \
+    cancellation_handler_type* handler_obj = \
+      new (del.mem.first) cancellation_handler_type( \
+        del.mem.second, BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+    del.mem.first = 0; \
+    *handler_ = handler_obj; \
+    return handler_obj->handler(); \
+  } \
+  /**/
+  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_HANDLER_EMPLACE_DEF)
+#undef BOOST_ASIO_PRIVATE_HANDLER_EMPLACE_DEF
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+  /// Installs a handler into the slot.
+  /**
+   * Destroys any existing handler in the slot, then installs the new handler,
+   * constructing it as a decay-copy of the supplied handler.
+   *
+   * The handler is a function object to be called when the signal is emitted.
+   * The signature of the handler must be
+   * @code void handler(boost::asio::cancellation_type_t); @endcode
+   *
+   * @param handler The handler to be installed.
+   *
+   * @returns A reference to the newly installed handler.
+   */
+  template <typename CancellationHandler>
+  typename decay<CancellationHandler>::type& assign(
+      BOOST_ASIO_MOVE_ARG(CancellationHandler) handler)
+  {
+    return this->emplace<typename decay<CancellationHandler>::type>(
+        BOOST_ASIO_MOVE_CAST(CancellationHandler)(handler));
+  }
+
+  /// Clears the slot.
+  /**
+   * Destroys any existing handler in the slot.
+   */
+  BOOST_ASIO_DECL void clear();
+
+  /// Returns whether the slot is connected to a signal.
+  BOOST_ASIO_CONSTEXPR bool is_connected() const BOOST_ASIO_NOEXCEPT
+  {
+    return handler_ != 0;
+  }
+
+  /// Returns whether the slot is connected and has an installed handler.
+  BOOST_ASIO_CONSTEXPR bool has_handler() const BOOST_ASIO_NOEXCEPT
+  {
+    return handler_ != 0 && *handler_ != 0;
+  }
+
+  /// Compare two slots for equality.
+  friend BOOST_ASIO_CONSTEXPR bool operator==(const cancellation_slot& lhs,
+      const cancellation_slot& rhs) BOOST_ASIO_NOEXCEPT
+  {
+    return lhs.handler_ == rhs.handler_;
+  }
+
+  /// Compare two slots for inequality.
+  friend BOOST_ASIO_CONSTEXPR bool operator!=(const cancellation_slot& lhs,
+      const cancellation_slot& rhs) BOOST_ASIO_NOEXCEPT
+  {
+    return lhs.handler_ != rhs.handler_;
+  }
+
+private:
+  friend class cancellation_signal;
+
+  BOOST_ASIO_CONSTEXPR cancellation_slot(int,
+      detail::cancellation_handler_base** handler)
+    : handler_(handler)
+  {
+  }
+
+  BOOST_ASIO_DECL std::pair<void*, std::size_t> prepare_memory(
+      std::size_t size, std::size_t align);
+
+  struct auto_delete_helper
+  {
+    std::pair<void*, std::size_t> mem;
+
+    BOOST_ASIO_DECL ~auto_delete_helper();
+  };
+
+  detail::cancellation_handler_base** handler_;
+};
+
+inline cancellation_slot cancellation_signal::slot() BOOST_ASIO_NOEXCEPT
+{
+  return cancellation_slot(0, &handler_);
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# include <boost/asio/impl/cancellation_signal.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
+#endif // BOOST_ASIO_CANCELLATION_SIGNAL_HPP

sources/boost/asio/cancellation_state.hpp

@@ -0,0 +1,237 @@
+//
+// cancellation_state.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_CANCELLATION_STATE_HPP
+#define BOOST_ASIO_CANCELLATION_STATE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <cassert>
+#include <new>
+#include <utility>
+#include <boost/asio/cancellation_signal.hpp>
+#include <boost/asio/detail/cstddef.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+/// A simple cancellation signal propagation filter.
+template <cancellation_type_t Mask>
+struct cancellation_filter
+{
+  /// Returns <tt>type & Mask</tt>.
+  cancellation_type_t operator()(
+      cancellation_type_t type) const BOOST_ASIO_NOEXCEPT
+  {
+    return type & Mask;
+  }
+};
+
+/// A cancellation filter that disables cancellation.
+typedef cancellation_filter<cancellation_type::none>
+  disable_cancellation;
+
+/// A cancellation filter that enables terminal cancellation only.
+typedef cancellation_filter<cancellation_type::terminal>
+  enable_terminal_cancellation;
+
+#if defined(GENERATING_DOCUMENTATION)
+
+/// A cancellation filter that enables terminal and partial cancellation.
+typedef cancellation_filter<
+    cancellation_type::terminal | cancellation_type::partial>
+  enable_partial_cancellation;
+
+/// A cancellation filter that enables terminal, partial and total cancellation.
+typedef cancellation_filter<cancellation_type::terminal
+    | cancellation_type::partial | cancellation_type::total>
+  enable_total_cancellation;
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+typedef cancellation_filter<
+    static_cast<cancellation_type_t>(
+      static_cast<unsigned int>(cancellation_type::terminal)
+        | static_cast<unsigned int>(cancellation_type::partial))>
+  enable_partial_cancellation;
+
+typedef cancellation_filter<
+    static_cast<cancellation_type_t>(
+      static_cast<unsigned int>(cancellation_type::terminal)
+        | static_cast<unsigned int>(cancellation_type::partial)
+        | static_cast<unsigned int>(cancellation_type::total))>
+  enable_total_cancellation;
+
+#endif // defined(GENERATING_DOCUMENTATION)
+
+/// A cancellation state is used for chaining signals and slots in compositions.
+class cancellation_state
+{
+public:
+  /// Construct a disconnected cancellation state.
+  BOOST_ASIO_CONSTEXPR cancellation_state() BOOST_ASIO_NOEXCEPT
+    : impl_(0)
+  {
+  }
+
+  /// Construct and attach to a parent slot to create a new child slot.
+  /**
+   * Initialises the cancellation state so that it allows terminal cancellation
+   * only. Equivalent to <tt>cancellation_state(slot,
+   * enable_terminal_cancellation())</tt>.
+   *
+   * @param slot The parent cancellation slot to which the state will be
+   * attached.
+   */
+  template <typename CancellationSlot>
+  BOOST_ASIO_CONSTEXPR explicit cancellation_state(CancellationSlot slot)
+    : impl_(slot.is_connected() ? &slot.template emplace<impl<> >() : 0)
+  {
+  }
+
+  /// Construct and attach to a parent slot to create a new child slot.
+  /**
+   * @param slot The parent cancellation slot to which the state will be
+   * attached.
+   *
+   * @param filter A function object that is used to transform incoming
+   * cancellation signals as they are received from the parent slot. This
+   * function object must have the signature:
+   * @code boost::asio::cancellation_type_t filter(
+   *     boost::asio::cancellation_type_t); @endcode
+   *
+   * The library provides the following pre-defined cancellation filters:
+   *
+   * @li boost::asio::disable_cancellation
+   * @li boost::asio::enable_terminal_cancellation
+   * @li boost::asio::enable_partial_cancellation
+   * @li boost::asio::enable_total_cancellation
+   */
+  template <typename CancellationSlot, typename Filter>
+  BOOST_ASIO_CONSTEXPR cancellation_state(CancellationSlot slot, Filter filter)
+    : impl_(slot.is_connected()
+        ? &slot.template emplace<impl<Filter, Filter> >(filter, filter)
+        : 0)
+  {
+  }
+
+  /// Construct and attach to a parent slot to create a new child slot.
+  /**
+   * @param slot The parent cancellation slot to which the state will be
+   * attached.
+   *
+   * @param in_filter A function object that is used to transform incoming
+   * cancellation signals as they are received from the parent slot. This
+   * function object must have the signature:
+   * @code boost::asio::cancellation_type_t in_filter(
+   *     boost::asio::cancellation_type_t); @endcode
+   *
+   * @param out_filter A function object that is used to transform outcoming
+   * cancellation signals as they are relayed to the child slot. This function
+   * object must have the signature:
+   * @code boost::asio::cancellation_type_t out_filter(
+   *     boost::asio::cancellation_type_t); @endcode
+   *
+   * The library provides the following pre-defined cancellation filters:
+   *
+   * @li boost::asio::disable_cancellation
+   * @li boost::asio::enable_terminal_cancellation
+   * @li boost::asio::enable_partial_cancellation
+   * @li boost::asio::enable_total_cancellation
+   */
+  template <typename CancellationSlot, typename InFilter, typename OutFilter>
+  BOOST_ASIO_CONSTEXPR cancellation_state(CancellationSlot slot,
+      InFilter in_filter, OutFilter out_filter)
+    : impl_(slot.is_connected()
+        ? &slot.template emplace<impl<InFilter, OutFilter> >(
+            BOOST_ASIO_MOVE_CAST(InFilter)(in_filter),
+            BOOST_ASIO_MOVE_CAST(OutFilter)(out_filter))
+        : 0)
+  {
+  }
+
+  /// Returns the single child slot associated with the state.
+  /**
+   * This sub-slot is used with the operations that are being composed.
+   */
+  BOOST_ASIO_CONSTEXPR cancellation_slot slot() const BOOST_ASIO_NOEXCEPT
+  {
+    return impl_ ? impl_->signal_.slot() : cancellation_slot();
+  }
+
+  /// Returns the cancellation types that have been triggered.
+  cancellation_type_t cancelled() const BOOST_ASIO_NOEXCEPT
+  {
+    return impl_ ? impl_->cancelled_ : cancellation_type_t();
+  }
+
+  /// Clears the specified cancellation types, if they have been triggered.
+  void clear(cancellation_type_t mask = cancellation_type::all)
+    BOOST_ASIO_NOEXCEPT
+  {
+    if (impl_)
+      impl_->cancelled_ &= ~mask;
+  }
+
+private:
+  struct impl_base
+  {
+    impl_base()
+      : cancelled_()
+    {
+    }
+
+    cancellation_signal signal_;
+    cancellation_type_t cancelled_;
+  };
+
+  template <
+      typename InFilter = enable_terminal_cancellation,
+      typename OutFilter = InFilter>
+  struct impl : impl_base
+  {
+    impl()
+      : in_filter_(),
+        out_filter_()
+    {
+    }
+
+    impl(InFilter in_filter, OutFilter out_filter)
+      : in_filter_(BOOST_ASIO_MOVE_CAST(InFilter)(in_filter)),
+        out_filter_(BOOST_ASIO_MOVE_CAST(OutFilter)(out_filter))
+    {
+    }
+
+    void operator()(cancellation_type_t in)
+    {
+      this->cancelled_ = in_filter_(in);
+      cancellation_type_t out = out_filter_(this->cancelled_);
+      if (out != cancellation_type::none)
+        this->signal_.emit(out);
+    }
+
+    InFilter in_filter_;
+    OutFilter out_filter_;
+  };
+
+  impl_base* impl_;
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_CANCELLATION_STATE_HPP

sources/boost/asio/cancellation_type.hpp

@@ -0,0 +1,176 @@
+//
+// cancellation_type.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_CANCELLATION_TYPE_HPP
+#define BOOST_ASIO_CANCELLATION_TYPE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+# if defined(GENERATING_DOCUMENTATION)
+
+/// Enumeration representing the different types of cancellation that may
+/// be requested from or implemented by an asynchronous operation.
+enum cancellation_type
+{
+  /// Bitmask representing no types of cancellation.
+  none = 0,
+
+  /// Requests cancellation where, following a successful cancellation, the only
+  /// safe operations on the I/O object are closure or destruction.
+  terminal = 1,
+
+  /// Requests cancellation where a successful cancellation may result in
+  /// partial side effects or no side effects. Following cancellation, the I/O
+  /// object is in a well-known state, and may be used for further operations.
+  partial = 2,
+
+  /// Requests cancellation where a successful cancellation results in no
+  /// apparent side effects. Following cancellation, the I/O object is in the
+  /// same observable state as it was prior to the operation.
+  total = 4,
+
+  /// Bitmask representing all types of cancellation.
+  all = 0xFFFFFFFF
+};
+
+/// Portability typedef.
+typedef cancellation_type cancellation_type_t;
+
+#elif defined(BOOST_ASIO_HAS_ENUM_CLASS)
+
+enum class cancellation_type : unsigned int
+{
+  none = 0,
+  terminal = 1,
+  partial = 2,
+  total = 4,
+  all = 0xFFFFFFFF
+};
+
+typedef cancellation_type cancellation_type_t;
+
+#else // defined(BOOST_ASIO_HAS_ENUM_CLASS)
+
+namespace cancellation_type {
+
+enum cancellation_type_t
+{
+  none = 0,
+  terminal = 1,
+  partial = 2,
+  total = 4,
+  all = 0xFFFFFFFF
+};
+
+} // namespace cancellation_type
+
+typedef cancellation_type::cancellation_type_t cancellation_type_t;
+
+#endif // defined(BOOST_ASIO_HAS_ENUM_CLASS)
+
+/// Negation operator.
+/**
+ * @relates cancellation_type
+ */
+inline BOOST_ASIO_CONSTEXPR bool operator!(cancellation_type_t x)
+{
+  return static_cast<unsigned int>(x) == 0;
+}
+
+/// Bitwise and operator.
+/**
+ * @relates cancellation_type
+ */
+inline BOOST_ASIO_CONSTEXPR cancellation_type_t operator&(
+    cancellation_type_t x, cancellation_type_t y)
+{
+  return static_cast<cancellation_type_t>(
+      static_cast<unsigned int>(x) & static_cast<unsigned int>(y));
+}
+
+/// Bitwise or operator.
+/**
+ * @relates cancellation_type
+ */
+inline BOOST_ASIO_CONSTEXPR cancellation_type_t operator|(
+    cancellation_type_t x, cancellation_type_t y)
+{
+  return static_cast<cancellation_type_t>(
+      static_cast<unsigned int>(x) | static_cast<unsigned int>(y));
+}
+
+/// Bitwise xor operator.
+/**
+ * @relates cancellation_type
+ */
+inline BOOST_ASIO_CONSTEXPR cancellation_type_t operator^(
+    cancellation_type_t x, cancellation_type_t y)
+{
+  return static_cast<cancellation_type_t>(
+      static_cast<unsigned int>(x) ^ static_cast<unsigned int>(y));
+}
+
+/// Bitwise negation operator.
+/**
+ * @relates cancellation_type
+ */
+inline BOOST_ASIO_CONSTEXPR cancellation_type_t operator~(cancellation_type_t x)
+{
+  return static_cast<cancellation_type_t>(~static_cast<unsigned int>(x));
+}
+
+/// Bitwise and-assignment operator.
+/**
+ * @relates cancellation_type
+ */
+inline cancellation_type_t& operator&=(
+    cancellation_type_t& x, cancellation_type_t y)
+{
+  x = x & y;
+  return x;
+}
+
+/// Bitwise or-assignment operator.
+/**
+ * @relates cancellation_type
+ */
+inline cancellation_type_t& operator|=(
+    cancellation_type_t& x, cancellation_type_t y)
+{
+  x = x | y;
+  return x;
+}
+
+/// Bitwise xor-assignment operator.
+/**
+ * @relates cancellation_type
+ */
+inline cancellation_type_t& operator^=(
+    cancellation_type_t& x, cancellation_type_t y)
+{
+  x = x ^ y;
+  return x;
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_CANCELLATION_TYPE_HPP

sources/boost/asio/co_spawn.hpp

@@ -2,7 +2,7 @@
 // co_spawn.hpp
 // ~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -96,6 +96,11 @@ struct awaitable_signature<awaitable<void, Executor>>
  *     std::cout << "transferred " << n << "\n";
  *   });
  * @endcode
+ *
+ * @par Per-Operation Cancellation
+ * The new thread of execution is created with a cancellation state that
+ * supports @c cancellation_type::terminal values only. To change the
+ * cancellation state, call boost::asio::this_coro::reset_cancellation_state.
  */
 template <typename Executor, typename T, typename AwaitableExecutor,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(
@@ -106,10 +111,10 @@ inline BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(
 co_spawn(const Executor& ex, awaitable<T, AwaitableExecutor> a,
     CompletionToken&& token
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
-    typename enable_if<
+    typename constraint<
       (is_executor<Executor>::value || execution::is_executor<Executor>::value)
         && is_convertible<Executor, AwaitableExecutor>::value
-    >::type* = 0);
+    >::type = 0);
 
 /// Spawn a new coroutined-based thread of execution.
 /**
@@ -152,6 +157,11 @@ co_spawn(const Executor& ex, awaitable<T, AwaitableExecutor> a,
  *   echo(std::move(my_tcp_socket)),
  *   boost::asio::detached);
  * @endcode
+ *
+ * @par Per-Operation Cancellation
+ * The new thread of execution is created with a cancellation state that
+ * supports @c cancellation_type::terminal values only. To change the
+ * cancellation state, call boost::asio::this_coro::reset_cancellation_state.
  */
 template <typename Executor, typename AwaitableExecutor,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(
@@ -162,10 +172,10 @@ inline BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(
 co_spawn(const Executor& ex, awaitable<void, AwaitableExecutor> a,
     CompletionToken&& token
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
-    typename enable_if<
+    typename constraint<
       (is_executor<Executor>::value || execution::is_executor<Executor>::value)
         && is_convertible<Executor, AwaitableExecutor>::value
-    >::type* = 0);
+    >::type = 0);
 
 /// Spawn a new coroutined-based thread of execution.
 /**
@@ -216,6 +226,11 @@ co_spawn(const Executor& ex, awaitable<void, AwaitableExecutor> a,
  *     std::cout << "transferred " << n << "\n";
  *   });
  * @endcode
+ *
+ * @par Per-Operation Cancellation
+ * The new thread of execution is created with a cancellation state that
+ * supports @c cancellation_type::terminal values only. To change the
+ * cancellation state, call boost::asio::this_coro::reset_cancellation_state.
  */
 template <typename ExecutionContext, typename T, typename AwaitableExecutor,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(
@@ -228,11 +243,11 @@ co_spawn(ExecutionContext& ctx, awaitable<T, AwaitableExecutor> a,
     CompletionToken&& token
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(
         typename ExecutionContext::executor_type),
-    typename enable_if<
+    typename constraint<
       is_convertible<ExecutionContext&, execution_context&>::value
         && is_convertible<typename ExecutionContext::executor_type,
           AwaitableExecutor>::value
-    >::type* = 0);
+    >::type = 0);
 
 /// Spawn a new coroutined-based thread of execution.
 /**
@@ -275,6 +290,11 @@ co_spawn(ExecutionContext& ctx, awaitable<T, AwaitableExecutor> a,
  *   echo(std::move(my_tcp_socket)),
  *   boost::asio::detached);
  * @endcode
+ *
+ * @par Per-Operation Cancellation
+ * The new thread of execution is created with a cancellation state that
+ * supports @c cancellation_type::terminal values only. To change the
+ * cancellation state, call boost::asio::this_coro::reset_cancellation_state.
  */
 template <typename ExecutionContext, typename AwaitableExecutor,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(
@@ -287,11 +307,11 @@ co_spawn(ExecutionContext& ctx, awaitable<void, AwaitableExecutor> a,
     CompletionToken&& token
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(
         typename ExecutionContext::executor_type),
-    typename enable_if<
+    typename constraint<
       is_convertible<ExecutionContext&, execution_context&>::value
         && is_convertible<typename ExecutionContext::executor_type,
           AwaitableExecutor>::value
-    >::type* = 0);
+    >::type = 0);
 
 /// Spawn a new coroutined-based thread of execution.
 /**
@@ -310,7 +330,6 @@ co_spawn(ExecutionContext& ctx, awaitable<void, AwaitableExecutor> a,
  * Otherwise, the function signature of the completion handler must be:
  * @code void handler(std::exception_ptr, R); @endcode
  *
- *
  * @par Example
  * @code
  * boost::asio::awaitable<std::size_t> echo(tcp::socket socket)
@@ -362,6 +381,11 @@ co_spawn(ExecutionContext& ctx, awaitable<void, AwaitableExecutor> a,
  *     }
  *   }, boost::asio::detached);
  * @endcode
+ *
+ * @par Per-Operation Cancellation
+ * The new thread of execution is created with a cancellation state that
+ * supports @c cancellation_type::terminal values only. To change the
+ * cancellation state, call boost::asio::this_coro::reset_cancellation_state.
  */
 template <typename Executor, typename F,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(typename detail::awaitable_signature<
@@ -372,9 +396,9 @@ BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken,
 co_spawn(const Executor& ex, F&& f,
     CompletionToken&& token
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
-    typename enable_if<
+    typename constraint<
       is_executor<Executor>::value || execution::is_executor<Executor>::value
-    >::type* = 0);
+    >::type = 0);
 
 /// Spawn a new coroutined-based thread of execution.
 /**
@@ -393,7 +417,6 @@ co_spawn(const Executor& ex, F&& f,
  * Otherwise, the function signature of the completion handler must be:
  * @code void handler(std::exception_ptr, R); @endcode
  *
- *
  * @par Example
  * @code
  * boost::asio::awaitable<std::size_t> echo(tcp::socket socket)
@@ -445,6 +468,11 @@ co_spawn(const Executor& ex, F&& f,
  *     }
  *   }, boost::asio::detached);
  * @endcode
+ *
+ * @par Per-Operation Cancellation
+ * The new thread of execution is created with a cancellation state that
+ * supports @c cancellation_type::terminal values only. To change the
+ * cancellation state, call boost::asio::this_coro::reset_cancellation_state.
  */
 template <typename ExecutionContext, typename F,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(typename detail::awaitable_signature<
@@ -457,9 +485,9 @@ co_spawn(ExecutionContext& ctx, F&& f,
     CompletionToken&& token
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(
         typename ExecutionContext::executor_type),
-    typename enable_if<
+    typename constraint<
       is_convertible<ExecutionContext&, execution_context&>::value
-    >::type* = 0);
+    >::type = 0);
 
 } // namespace asio
 } // namespace boost

sources/boost/asio/completion_condition.hpp

@@ -2,7 +2,7 @@
 // completion_condition.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/compose.hpp

@@ -2,7 +2,7 @@
 // compose.hpp
 // ~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/connect.hpp

@@ -2,7 +2,7 @@
 // connect.hpp
 // ~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -91,8 +91,8 @@ struct is_endpoint_sequence
 template <typename Protocol, typename Executor, typename EndpointSequence>
 typename Protocol::endpoint connect(basic_socket<Protocol, Executor>& s,
     const EndpointSequence& endpoints,
-    typename enable_if<is_endpoint_sequence<
+    typename constraint<is_endpoint_sequence<
-        EndpointSequence>::value>::type* = 0);
+        EndpointSequence>::value>::type = 0);
 
 /// Establishes a socket connection by trying each endpoint in a sequence.
 /**
@@ -127,8 +127,8 @@ typename Protocol::endpoint connect(basic_socket<Protocol, Executor>& s,
 template <typename Protocol, typename Executor, typename EndpointSequence>
 typename Protocol::endpoint connect(basic_socket<Protocol, Executor>& s,
     const EndpointSequence& endpoints, boost::system::error_code& ec,
-    typename enable_if<is_endpoint_sequence<
+    typename constraint<is_endpoint_sequence<
-        EndpointSequence>::value>::type* = 0);
+        EndpointSequence>::value>::type = 0);
 
 #if !defined(BOOST_ASIO_NO_DEPRECATED)
 /// (Deprecated: Use range overload.) Establishes a socket connection by trying
@@ -157,7 +157,7 @@ typename Protocol::endpoint connect(basic_socket<Protocol, Executor>& s,
  */
 template <typename Protocol, typename Executor, typename Iterator>
 Iterator connect(basic_socket<Protocol, Executor>& s, Iterator begin,
-    typename enable_if<!is_endpoint_sequence<Iterator>::value>::type* = 0);
+    typename constraint<!is_endpoint_sequence<Iterator>::value>::type = 0);
 
 /// (Deprecated: Use range overload.) Establishes a socket connection by trying
 /// each endpoint in a sequence.
@@ -186,7 +186,7 @@ Iterator connect(basic_socket<Protocol, Executor>& s, Iterator begin,
 template <typename Protocol, typename Executor, typename Iterator>
 Iterator connect(basic_socket<Protocol, Executor>& s,
     Iterator begin, boost::system::error_code& ec,
-    typename enable_if<!is_endpoint_sequence<Iterator>::value>::type* = 0);
+    typename constraint<!is_endpoint_sequence<Iterator>::value>::type = 0);
 #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
 
 /// Establishes a socket connection by trying each endpoint in a sequence.
@@ -312,8 +312,8 @@ template <typename Protocol, typename Executor,
     typename EndpointSequence, typename ConnectCondition>
 typename Protocol::endpoint connect(basic_socket<Protocol, Executor>& s,
     const EndpointSequence& endpoints, ConnectCondition connect_condition,
-    typename enable_if<is_endpoint_sequence<
+    typename constraint<is_endpoint_sequence<
-        EndpointSequence>::value>::type* = 0);
+        EndpointSequence>::value>::type = 0);
 
 /// Establishes a socket connection by trying each endpoint in a sequence.
 /**
@@ -380,8 +380,8 @@ template <typename Protocol, typename Executor,
 typename Protocol::endpoint connect(basic_socket<Protocol, Executor>& s,
     const EndpointSequence& endpoints, ConnectCondition connect_condition,
     boost::system::error_code& ec,
-    typename enable_if<is_endpoint_sequence<
+    typename constraint<is_endpoint_sequence<
-        EndpointSequence>::value>::type* = 0);
+        EndpointSequence>::value>::type = 0);
 
 #if !defined(BOOST_ASIO_NO_DEPRECATED)
 /// (Deprecated: Use range overload.) Establishes a socket connection by trying
@@ -423,7 +423,7 @@ template <typename Protocol, typename Executor,
     typename Iterator, typename ConnectCondition>
 Iterator connect(basic_socket<Protocol, Executor>& s,
     Iterator begin, ConnectCondition connect_condition,
-    typename enable_if<!is_endpoint_sequence<Iterator>::value>::type* = 0);
+    typename constraint<!is_endpoint_sequence<Iterator>::value>::type = 0);
 
 /// (Deprecated: Use range overload.) Establishes a socket connection by trying
 /// each endpoint in a sequence.
@@ -464,7 +464,7 @@ template <typename Protocol, typename Executor,
     typename Iterator, typename ConnectCondition>
 Iterator connect(basic_socket<Protocol, Executor>& s, Iterator begin,
     ConnectCondition connect_condition, boost::system::error_code& ec,
-    typename enable_if<!is_endpoint_sequence<Iterator>::value>::type* = 0);
+    typename constraint<!is_endpoint_sequence<Iterator>::value>::type = 0);
 #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
 
 /// Establishes a socket connection by trying each endpoint in a sequence.
@@ -665,6 +665,16 @@ Iterator connect(basic_socket<Protocol, Executor>& s,
  * {
  *   // ...
  * } @endcode
+ *
+ * @par Per-Operation Cancellation
+ * This asynchronous operation supports cancellation for the following
+ * boost::asio::cancellation_type values:
+ *
+ * @li @c cancellation_type::terminal
+ *
+ * @li @c cancellation_type::partial
+ *
+ * if they are also supported by the socket's @c async_connect operation.
  */
 template <typename Protocol, typename Executor, typename EndpointSequence,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -676,8 +686,8 @@ async_connect(basic_socket<Protocol, Executor>& s,
     const EndpointSequence& endpoints,
     BOOST_ASIO_MOVE_ARG(RangeConnectHandler) handler
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
-    typename enable_if<is_endpoint_sequence<
+    typename constraint<is_endpoint_sequence<
-        EndpointSequence>::value>::type* = 0);
+        EndpointSequence>::value>::type = 0);
 
 #if !defined(BOOST_ASIO_NO_DEPRECATED)
 /// (Deprecated: Use range overload.) Asynchronously establishes a socket
@@ -714,6 +724,16 @@ async_connect(basic_socket<Protocol, Executor>& s,
  * @note This overload assumes that a default constructed object of type @c
  * Iterator represents the end of the sequence. This is a valid assumption for
  * iterator types such as @c boost::asio::ip::tcp::resolver::iterator.
+ *
+ * @par Per-Operation Cancellation
+ * This asynchronous operation supports cancellation for the following
+ * boost::asio::cancellation_type values:
+ *
+ * @li @c cancellation_type::terminal
+ *
+ * @li @c cancellation_type::partial
+ *
+ * if they are also supported by the socket's @c async_connect operation.
  */
 template <typename Protocol, typename Executor, typename Iterator,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -724,7 +744,7 @@ BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(IteratorConnectHandler,
 async_connect(basic_socket<Protocol, Executor>& s, Iterator begin,
     BOOST_ASIO_MOVE_ARG(IteratorConnectHandler) handler
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
-    typename enable_if<!is_endpoint_sequence<Iterator>::value>::type* = 0);
+    typename constraint<!is_endpoint_sequence<Iterator>::value>::type = 0);
 #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
 
 /// Asynchronously establishes a socket connection by trying each endpoint in a
@@ -775,6 +795,16 @@ async_connect(basic_socket<Protocol, Executor>& s, Iterator begin,
  * {
  *   // ...
  * } @endcode
+ *
+ * @par Per-Operation Cancellation
+ * This asynchronous operation supports cancellation for the following
+ * boost::asio::cancellation_type values:
+ *
+ * @li @c cancellation_type::terminal
+ *
+ * @li @c cancellation_type::partial
+ *
+ * if they are also supported by the socket's @c async_connect operation.
  */
 template <typename Protocol, typename Executor, typename Iterator,
     BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
@@ -880,6 +910,16 @@ async_connect(basic_socket<Protocol, Executor>& s, Iterator begin, Iterator end,
  *     std::cout << "Connected to: " << endpoint << std::endl;
  *   }
  * } @endcode
+ *
+ * @par Per-Operation Cancellation
+ * This asynchronous operation supports cancellation for the following
+ * boost::asio::cancellation_type values:
+ *
+ * @li @c cancellation_type::terminal
+ *
+ * @li @c cancellation_type::partial
+ *
+ * if they are also supported by the socket's @c async_connect operation.
  */
 template <typename Protocol, typename Executor,
     typename EndpointSequence, typename ConnectCondition,
@@ -892,8 +932,8 @@ async_connect(basic_socket<Protocol, Executor>& s,
     const EndpointSequence& endpoints, ConnectCondition connect_condition,
     BOOST_ASIO_MOVE_ARG(RangeConnectHandler) handler
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
-    typename enable_if<is_endpoint_sequence<
+    typename constraint<is_endpoint_sequence<
-        EndpointSequence>::value>::type* = 0);
+        EndpointSequence>::value>::type = 0);
 
 #if !defined(BOOST_ASIO_NO_DEPRECATED)
 /// (Deprecated: Use range overload.) Asynchronously establishes a socket
@@ -941,6 +981,16 @@ async_connect(basic_socket<Protocol, Executor>& s,
  * @note This overload assumes that a default constructed object of type @c
  * Iterator represents the end of the sequence. This is a valid assumption for
  * iterator types such as @c boost::asio::ip::tcp::resolver::iterator.
+ *
+ * @par Per-Operation Cancellation
+ * This asynchronous operation supports cancellation for the following
+ * boost::asio::cancellation_type values:
+ *
+ * @li @c cancellation_type::terminal
+ *
+ * @li @c cancellation_type::partial
+ *
+ * if they are also supported by the socket's @c async_connect operation.
  */
 template <typename Protocol, typename Executor,
     typename Iterator, typename ConnectCondition,
@@ -953,7 +1003,7 @@ async_connect(basic_socket<Protocol, Executor>& s, Iterator begin,
     ConnectCondition connect_condition,
     BOOST_ASIO_MOVE_ARG(IteratorConnectHandler) handler
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
-    typename enable_if<!is_endpoint_sequence<Iterator>::value>::type* = 0);
+    typename constraint<!is_endpoint_sequence<Iterator>::value>::type = 0);
 #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
 
 /// Asynchronously establishes a socket connection by trying each endpoint in a
@@ -1053,6 +1103,16 @@ async_connect(basic_socket<Protocol, Executor>& s, Iterator begin,
  *     std::cout << "Connected to: " << i->endpoint() << std::endl;
  *   }
  * } @endcode
+ *
+ * @par Per-Operation Cancellation
+ * This asynchronous operation supports cancellation for the following
+ * boost::asio::cancellation_type values:
+ *
+ * @li @c cancellation_type::terminal
+ *
+ * @li @c cancellation_type::partial
+ *
+ * if they are also supported by the socket's @c async_connect operation.
  */
 template <typename Protocol, typename Executor,
     typename Iterator, typename ConnectCondition,

sources/boost/asio/connect_pipe.hpp

@@ -0,0 +1,85 @@
+//
+// connect_pipe.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_CONNECT_PIPE_HPP
+#define BOOST_ASIO_CONNECT_PIPE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_PIPE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#include <boost/asio/basic_readable_pipe.hpp>
+#include <boost/asio/basic_writable_pipe.hpp>
+#include <boost/asio/error.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+#if defined(BOOST_ASIO_HAS_IOCP)
+typedef HANDLE native_pipe_handle;
+#else // defined(BOOST_ASIO_HAS_IOCP)
+typedef int native_pipe_handle;
+#endif // defined(BOOST_ASIO_HAS_IOCP)
+
+BOOST_ASIO_DECL void create_pipe(native_pipe_handle p[2],
+    boost::system::error_code& ec);
+
+BOOST_ASIO_DECL void close_pipe(native_pipe_handle p);
+
+} // namespace detail
+
+/// Connect two pipe ends using an anonymous pipe.
+/**
+ * @param read_end The read end of the pipe.
+ *
+ * @param write_end The write end of the pipe.
+ *
+ * @throws boost::system::system_error Thrown on failure.
+ */
+template <typename Executor1, typename Executor2>
+void connect_pipe(basic_readable_pipe<Executor1>& read_end,
+    basic_writable_pipe<Executor2>& write_end);
+
+/// Connect two pipe ends using an anonymous pipe.
+/**
+ * @param read_end The read end of the pipe.
+ *
+ * @param write_end The write end of the pipe.
+ *
+ * @throws boost::system::system_error Thrown on failure.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ */
+template <typename Executor1, typename Executor2>
+BOOST_ASIO_SYNC_OP_VOID connect_pipe(basic_readable_pipe<Executor1>& read_end,
+    basic_writable_pipe<Executor2>& write_end, boost::system::error_code& ec);
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/impl/connect_pipe.hpp>
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# include <boost/asio/impl/connect_pipe.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
+#endif // defined(BOOST_ASIO_HAS_PIPE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#endif // BOOST_ASIO_CONNECT_PIPE_HPP

sources/boost/asio/coroutine.hpp

@@ -2,7 +2,7 @@
 // coroutine.hpp
 // ~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/deadline_timer.hpp

@@ -2,7 +2,7 @@
 // deadline_timer.hpp
 // ~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/defer.hpp

@@ -2,7 +2,7 @@
 // defer.hpp
 // ~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -102,9 +102,9 @@ BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) defer(
     const Executor& ex,
     BOOST_ASIO_MOVE_ARG(CompletionToken) token
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
-    typename enable_if<
+    typename constraint<
       execution::is_executor<Executor>::value || is_executor<Executor>::value
-    >::type* = 0);
+    >::type = 0);
 
 /// Submits a completion token or function object for execution.
 /**
@@ -119,8 +119,8 @@ BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) defer(
     BOOST_ASIO_MOVE_ARG(CompletionToken) token
       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(
         typename ExecutionContext::executor_type),
-    typename enable_if<is_convertible<
+    typename constraint<is_convertible<
-      ExecutionContext&, execution_context&>::value>::type* = 0);
+      ExecutionContext&, execution_context&>::value>::type = 0);
 
 } // namespace asio
 } // namespace boost

sources/boost/asio/detached.hpp

@@ -2,7 +2,7 @@
 // detached.hpp
 // ~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -62,9 +62,9 @@ public:
     /// that to construct the adapted executor.
     template <typename OtherExecutor>
     executor_with_default(const OtherExecutor& ex,
-        typename enable_if<
+        typename constraint<
           is_convertible<OtherExecutor, InnerExecutor>::value
-        >::type* = 0) BOOST_ASIO_NOEXCEPT
+        >::type = 0) BOOST_ASIO_NOEXCEPT
       : InnerExecutor(ex)
     {
     }

sources/boost/asio/detail/array.hpp

@@ -2,7 +2,7 @@
 // detail/array.hpp
 // ~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/array_fwd.hpp

@@ -2,7 +2,7 @@
 // detail/array_fwd.hpp
 // ~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/assert.hpp

@@ -2,7 +2,7 @@
 // detail/assert.hpp
 // ~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/atomic_count.hpp

@@ -2,7 +2,7 @@
 // detail/atomic_count.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -32,11 +32,13 @@ namespace detail {
 #if !defined(BOOST_ASIO_HAS_THREADS)
 typedef long atomic_count;
 inline void increment(atomic_count& a, long b) { a += b; }
+inline void decrement(atomic_count& a, long b) { a -= b; }
 inline void ref_count_up(atomic_count& a) { ++a; }
 inline bool ref_count_down(atomic_count& a) { return --a == 0; }
 #elif defined(BOOST_ASIO_HAS_STD_ATOMIC)
 typedef std::atomic<long> atomic_count;
 inline void increment(atomic_count& a, long b) { a += b; }
+inline void decrement(atomic_count& a, long b) { a -= b; }
 
 inline void ref_count_up(atomic_count& a)
 {
@@ -55,6 +57,7 @@ inline bool ref_count_down(atomic_count& a)
 #else // defined(BOOST_ASIO_HAS_STD_ATOMIC)
 typedef boost::detail::atomic_count atomic_count;
 inline void increment(atomic_count& a, long b) { while (b > 0) ++a, --b; }
+inline void decrement(atomic_count& a, long b) { while (b > 0) --a, --b; }
 inline void ref_count_up(atomic_count& a) { ++a; }
 inline bool ref_count_down(atomic_count& a) { return --a == 0; }
 #endif // defined(BOOST_ASIO_HAS_STD_ATOMIC)

sources/boost/asio/detail/base_from_cancellation_state.hpp

@@ -0,0 +1,165 @@
+//
+// detail/base_from_cancellation_state.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP
+#define BOOST_ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/associated_cancellation_slot.hpp>
+#include <boost/asio/cancellation_state.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+template <typename Handler, typename = void>
+class base_from_cancellation_state
+{
+public:
+  typedef cancellation_slot cancellation_slot_type;
+
+  cancellation_slot_type get_cancellation_slot() const BOOST_ASIO_NOEXCEPT
+  {
+    return cancellation_state_.slot();
+  }
+
+  cancellation_state get_cancellation_state() const BOOST_ASIO_NOEXCEPT
+  {
+    return cancellation_state_;
+  }
+
+protected:
+  explicit base_from_cancellation_state(const Handler& handler)
+    : cancellation_state_(
+        boost::asio::get_associated_cancellation_slot(handler))
+  {
+  }
+
+  template <typename Filter>
+  base_from_cancellation_state(const Handler& handler, Filter filter)
+    : cancellation_state_(
+        boost::asio::get_associated_cancellation_slot(handler), filter, filter)
+  {
+  }
+
+  template <typename InFilter, typename OutFilter>
+  base_from_cancellation_state(const Handler& handler,
+      BOOST_ASIO_MOVE_ARG(InFilter) in_filter,
+      BOOST_ASIO_MOVE_ARG(OutFilter) out_filter)
+    : cancellation_state_(
+        boost::asio::get_associated_cancellation_slot(handler),
+        BOOST_ASIO_MOVE_CAST(InFilter)(in_filter),
+        BOOST_ASIO_MOVE_CAST(OutFilter)(out_filter))
+  {
+  }
+
+  void reset_cancellation_state(const Handler& handler)
+  {
+    cancellation_state_ = cancellation_state(
+        boost::asio::get_associated_cancellation_slot(handler));
+  }
+
+  template <typename Filter>
+  void reset_cancellation_state(const Handler& handler, Filter filter)
+  {
+    cancellation_state_ = cancellation_state(
+        boost::asio::get_associated_cancellation_slot(handler), filter, filter);
+  }
+
+  template <typename InFilter, typename OutFilter>
+  void reset_cancellation_state(const Handler& handler,
+      BOOST_ASIO_MOVE_ARG(InFilter) in_filter,
+      BOOST_ASIO_MOVE_ARG(OutFilter) out_filter)
+  {
+    cancellation_state_ = cancellation_state(
+        boost::asio::get_associated_cancellation_slot(handler),
+        BOOST_ASIO_MOVE_CAST(InFilter)(in_filter),
+        BOOST_ASIO_MOVE_CAST(OutFilter)(out_filter));
+  }
+
+  cancellation_type_t cancelled() const BOOST_ASIO_NOEXCEPT
+  {
+    return cancellation_state_.cancelled();
+  }
+
+private:
+  cancellation_state cancellation_state_;
+};
+
+template <typename Handler>
+class base_from_cancellation_state<Handler,
+    typename enable_if<
+      is_same<
+        typename associated_cancellation_slot<
+          Handler, cancellation_slot
+        >::asio_associated_cancellation_slot_is_unspecialised,
+        void
+      >::value
+    >::type>
+{
+public:
+  cancellation_state get_cancellation_state() const BOOST_ASIO_NOEXCEPT
+  {
+    return cancellation_state();
+  }
+
+protected:
+  explicit base_from_cancellation_state(const Handler&)
+  {
+  }
+
+  template <typename Filter>
+  base_from_cancellation_state(const Handler&, Filter)
+  {
+  }
+
+  template <typename InFilter, typename OutFilter>
+  base_from_cancellation_state(const Handler&,
+      BOOST_ASIO_MOVE_ARG(InFilter),
+      BOOST_ASIO_MOVE_ARG(OutFilter))
+  {
+  }
+
+  void reset_cancellation_state(const Handler&)
+  {
+  }
+
+  template <typename Filter>
+  void reset_cancellation_state(const Handler&, Filter)
+  {
+  }
+
+  template <typename InFilter, typename OutFilter>
+  void reset_cancellation_state(const Handler&,
+      BOOST_ASIO_MOVE_ARG(InFilter),
+      BOOST_ASIO_MOVE_ARG(OutFilter))
+  {
+  }
+
+  BOOST_ASIO_CONSTEXPR cancellation_type_t cancelled() const BOOST_ASIO_NOEXCEPT
+  {
+    return cancellation_type::none;
+  }
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP

sources/boost/asio/detail/base_from_completion_cond.hpp

@@ -2,7 +2,7 @@
 // detail/base_from_completion_cond.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/bind_handler.hpp

@@ -2,7 +2,7 @@
 // detail/bind_handler.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -16,8 +16,7 @@
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
 #include <boost/asio/detail/config.hpp>
-#include <boost/asio/associated_allocator.hpp>
+#include <boost/asio/associator.hpp>
-#include <boost/asio/associated_executor.hpp>
 #include <boost/asio/detail/handler_alloc_helpers.hpp>
 #include <boost/asio/detail/handler_cont_helpers.hpp>
 #include <boost/asio/detail/handler_invoke_helpers.hpp>
@@ -29,6 +28,113 @@ namespace boost {
 namespace asio {
 namespace detail {
 
+template <typename Handler>
+class binder0
+{
+public:
+  template <typename T>
+  binder0(int, BOOST_ASIO_MOVE_ARG(T) handler)
+    : handler_(BOOST_ASIO_MOVE_CAST(T)(handler))
+  {
+  }
+
+  binder0(Handler& handler)
+    : handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
+  {
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+  binder0(const binder0& other)
+    : handler_(other.handler_)
+  {
+  }
+
+  binder0(binder0&& other)
+    : handler_(BOOST_ASIO_MOVE_CAST(Handler)(other.handler_))
+  {
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+  void operator()()
+  {
+    BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)();
+  }
+
+  void operator()() const
+  {
+    handler_();
+  }
+
+//private:
+  Handler handler_;
+};
+
+template <typename Handler>
+inline asio_handler_allocate_is_deprecated
+asio_handler_allocate(std::size_t size,
+    binder0<Handler>* this_handler)
+{
+#if defined(BOOST_ASIO_NO_DEPRECATED)
+  boost_asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
+  return asio_handler_allocate_is_no_longer_used();
+#else // defined(BOOST_ASIO_NO_DEPRECATED)
+  return boost_asio_handler_alloc_helpers::allocate(
+      size, this_handler->handler_);
+#endif // defined(BOOST_ASIO_NO_DEPRECATED)
+}
+
+template <typename Handler>
+inline asio_handler_deallocate_is_deprecated
+asio_handler_deallocate(void* pointer, std::size_t size,
+    binder0<Handler>* this_handler)
+{
+  boost_asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->handler_);
+#if defined(BOOST_ASIO_NO_DEPRECATED)
+  return asio_handler_deallocate_is_no_longer_used();
+#endif // defined(BOOST_ASIO_NO_DEPRECATED)
+}
+
+template <typename Handler>
+inline bool asio_handler_is_continuation(
+    binder0<Handler>* this_handler)
+{
+  return boost_asio_handler_cont_helpers::is_continuation(
+      this_handler->handler_);
+}
+
+template <typename Function, typename Handler>
+inline asio_handler_invoke_is_deprecated
+asio_handler_invoke(Function& function,
+    binder0<Handler>* this_handler)
+{
+  boost_asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+#if defined(BOOST_ASIO_NO_DEPRECATED)
+  return asio_handler_invoke_is_no_longer_used();
+#endif // defined(BOOST_ASIO_NO_DEPRECATED)
+}
+
+template <typename Function, typename Handler>
+inline asio_handler_invoke_is_deprecated
+asio_handler_invoke(const Function& function,
+    binder0<Handler>* this_handler)
+{
+  boost_asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+#if defined(BOOST_ASIO_NO_DEPRECATED)
+  return asio_handler_invoke_is_no_longer_used();
+#endif // defined(BOOST_ASIO_NO_DEPRECATED)
+}
+
+template <typename Handler>
+inline binder0<typename decay<Handler>::type> bind_handler(
+    BOOST_ASIO_MOVE_ARG(Handler) handler)
+{
+  return binder0<typename decay<Handler>::type>(
+      0, BOOST_ASIO_MOVE_CAST(Handler)(handler));
+}
+
 template <typename Handler, typename Arg1>
 class binder1
 {
@@ -62,7 +168,8 @@ public:
 
   void operator()()
   {
-    handler_(static_cast<const Arg1&>(arg1_));
+    BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
+        static_cast<const Arg1&>(arg1_));
   }
 
   void operator()() const
@@ -179,7 +286,8 @@ public:
 
   void operator()()
   {
-    handler_(static_cast<const Arg1&>(arg1_),
+    BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
+        static_cast<const Arg1&>(arg1_),
         static_cast<const Arg2&>(arg2_));
   }
 
@@ -303,8 +411,10 @@ public:
 
   void operator()()
   {
-    handler_(static_cast<const Arg1&>(arg1_),
+    BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
-        static_cast<const Arg2&>(arg2_), static_cast<const Arg3&>(arg3_));
+        static_cast<const Arg1&>(arg1_),
+        static_cast<const Arg2&>(arg2_),
+        static_cast<const Arg3&>(arg3_));
   }
 
   void operator()() const
@@ -436,8 +546,10 @@ public:
 
   void operator()()
   {
-    handler_(static_cast<const Arg1&>(arg1_),
+    BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
-        static_cast<const Arg2&>(arg2_), static_cast<const Arg3&>(arg3_),
+        static_cast<const Arg1&>(arg1_),
+        static_cast<const Arg2&>(arg2_),
+        static_cast<const Arg3&>(arg3_),
         static_cast<const Arg4&>(arg4_));
   }
 
@@ -579,9 +691,12 @@ public:
 
   void operator()()
   {
-    handler_(static_cast<const Arg1&>(arg1_),
+    BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
-        static_cast<const Arg2&>(arg2_), static_cast<const Arg3&>(arg3_),
+        static_cast<const Arg1&>(arg1_),
-        static_cast<const Arg4&>(arg4_), static_cast<const Arg5&>(arg5_));
+        static_cast<const Arg2&>(arg2_),
+        static_cast<const Arg3&>(arg3_),
+        static_cast<const Arg4&>(arg4_),
+        static_cast<const Arg5&>(arg5_));
   }
 
   void operator()() const
@@ -692,7 +807,8 @@ public:
 
   void operator()()
   {
-    handler_(BOOST_ASIO_MOVE_CAST(Arg1)(arg1_));
+    BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
+        BOOST_ASIO_MOVE_CAST(Arg1)(arg1_));
   }
 
 //private:
@@ -767,7 +883,8 @@ public:
 
   void operator()()
   {
-    handler_(static_cast<const Arg1&>(arg1_),
+    BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
+        static_cast<const Arg1&>(arg1_),
         BOOST_ASIO_MOVE_CAST(Arg2)(arg2_));
   }
 
@@ -827,102 +944,122 @@ asio_handler_invoke(BOOST_ASIO_MOVE_ARG(Function) function,
 
 } // namespace detail
 
-template <typename Handler, typename Arg1, typename Allocator>
+template <template <typename, typename> class Associator,
-struct associated_allocator<detail::binder1<Handler, Arg1>, Allocator>
+    typename Handler, typename DefaultCandidate>
+struct associator<Associator,
+    detail::binder0<Handler>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
 {
-  typedef typename associated_allocator<Handler, Allocator>::type type;
+  static typename Associator<Handler, DefaultCandidate>::type get(
-
+      const detail::binder0<Handler>& h,
-  static type get(const detail::binder1<Handler, Arg1>& h,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
-      const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT
   {
-    return associated_allocator<Handler, Allocator>::get(h.handler_, a);
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
   }
 };
 
-template <typename Handler, typename Arg1, typename Arg2, typename Allocator>
+template <template <typename, typename> class Associator,
-struct associated_allocator<detail::binder2<Handler, Arg1, Arg2>, Allocator>
+    typename Handler, typename Arg1, typename DefaultCandidate>
+struct associator<Associator,
+    detail::binder1<Handler, Arg1>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
 {
-  typedef typename associated_allocator<Handler, Allocator>::type type;
+  static typename Associator<Handler, DefaultCandidate>::type get(
-
+      const detail::binder1<Handler, Arg1>& h,
-  static type get(const detail::binder2<Handler, Arg1, Arg2>& h,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
-      const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT
   {
-    return associated_allocator<Handler, Allocator>::get(h.handler_, a);
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
   }
 };
 
-template <typename Handler, typename Arg1, typename Executor>
+template <template <typename, typename> class Associator,
-struct associated_executor<detail::binder1<Handler, Arg1>, Executor>
+    typename Handler, typename Arg1, typename Arg2,
+    typename DefaultCandidate>
+struct associator<Associator,
+    detail::binder2<Handler, Arg1, Arg2>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
 {
-  typedef typename associated_executor<Handler, Executor>::type type;
+  static typename Associator<Handler, DefaultCandidate>::type get(
-
+      const detail::binder2<Handler, Arg1, Arg2>& h,
-  static type get(const detail::binder1<Handler, Arg1>& h,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
-      const Executor& ex = Executor()) BOOST_ASIO_NOEXCEPT
   {
-    return associated_executor<Handler, Executor>::get(h.handler_, ex);
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
   }
 };
 
-template <typename Handler, typename Arg1, typename Arg2, typename Executor>
+template <template <typename, typename> class Associator,
-struct associated_executor<detail::binder2<Handler, Arg1, Arg2>, Executor>
+    typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename DefaultCandidate>
+struct associator<Associator,
+    detail::binder3<Handler, Arg1, Arg2, Arg3>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
 {
-  typedef typename associated_executor<Handler, Executor>::type type;
+  static typename Associator<Handler, DefaultCandidate>::type get(
-
+      const detail::binder3<Handler, Arg1, Arg2, Arg3>& h,
-  static type get(const detail::binder2<Handler, Arg1, Arg2>& h,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
-      const Executor& ex = Executor()) BOOST_ASIO_NOEXCEPT
   {
-    return associated_executor<Handler, Executor>::get(h.handler_, ex);
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
+  }
+};
+
+template <template <typename, typename> class Associator,
+    typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4, typename DefaultCandidate>
+struct associator<Associator,
+    detail::binder4<Handler, Arg1, Arg2, Arg3, Arg4>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
+{
+  static typename Associator<Handler, DefaultCandidate>::type get(
+      const detail::binder4<Handler, Arg1, Arg2, Arg3, Arg4>& h,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
+  {
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
+  }
+};
+
+template <template <typename, typename> class Associator,
+    typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4, typename Arg5, typename DefaultCandidate>
+struct associator<Associator,
+    detail::binder5<Handler, Arg1, Arg2, Arg3, Arg4, Arg5>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
+{
+  static typename Associator<Handler, DefaultCandidate>::type get(
+      const detail::binder5<Handler, Arg1, Arg2, Arg3, Arg4, Arg5>& h,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
+  {
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
   }
 };
 
 #if defined(BOOST_ASIO_HAS_MOVE)
 
-template <typename Handler, typename Arg1, typename Allocator>
+template <template <typename, typename> class Associator,
-struct associated_allocator<detail::move_binder1<Handler, Arg1>, Allocator>
+    typename Handler, typename Arg1, typename DefaultCandidate>
+struct associator<Associator,
+    detail::move_binder1<Handler, Arg1>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
 {
-  typedef typename associated_allocator<Handler, Allocator>::type type;
+  static typename Associator<Handler, DefaultCandidate>::type get(
-
+      const detail::move_binder1<Handler, Arg1>& h,
-  static type get(const detail::move_binder1<Handler, Arg1>& h,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
-      const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT
   {
-    return associated_allocator<Handler, Allocator>::get(h.handler_, a);
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
   }
 };
 
-template <typename Handler, typename Arg1, typename Arg2, typename Allocator>
+template <template <typename, typename> class Associator,
-struct associated_allocator<
+    typename Handler, typename Arg1, typename Arg2,
-    detail::move_binder2<Handler, Arg1, Arg2>, Allocator>
+    typename DefaultCandidate>
+struct associator<Associator,
+    detail::move_binder2<Handler, Arg1, Arg2>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
 {
-  typedef typename associated_allocator<Handler, Allocator>::type type;
+  static typename Associator<Handler, DefaultCandidate>::type get(
-
+      const detail::move_binder2<Handler, Arg1, Arg2>& h,
-  static type get(const detail::move_binder2<Handler, Arg1, Arg2>& h,
+      const DefaultCandidate& c = DefaultCandidate()) BOOST_ASIO_NOEXCEPT
-      const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT
   {
-    return associated_allocator<Handler, Allocator>::get(h.handler_, a);
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
-  }
-};
-
-template <typename Handler, typename Arg1, typename Executor>
-struct associated_executor<detail::move_binder1<Handler, Arg1>, Executor>
-{
-  typedef typename associated_executor<Handler, Executor>::type type;
-
-  static type get(const detail::move_binder1<Handler, Arg1>& h,
-      const Executor& ex = Executor()) BOOST_ASIO_NOEXCEPT
-  {
-    return associated_executor<Handler, Executor>::get(h.handler_, ex);
-  }
-};
-
-template <typename Handler, typename Arg1, typename Arg2, typename Executor>
-struct associated_executor<detail::move_binder2<Handler, Arg1, Arg2>, Executor>
-{
-  typedef typename associated_executor<Handler, Executor>::type type;
-
-  static type get(const detail::move_binder2<Handler, Arg1, Arg2>& h,
-      const Executor& ex = Executor()) BOOST_ASIO_NOEXCEPT
-  {
-    return associated_executor<Handler, Executor>::get(h.handler_, ex);
   }
 };
 

sources/boost/asio/detail/blocking_executor_op.hpp

@@ -2,7 +2,7 @@
 // detail/blocking_executor_op.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/buffer_resize_guard.hpp

@@ -2,7 +2,7 @@
 // detail/buffer_resize_guard.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/buffer_sequence_adapter.hpp

@@ -2,7 +2,7 @@
 // detail/buffer_sequence_adapter.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -19,6 +19,7 @@
 #include <boost/asio/buffer.hpp>
 #include <boost/asio/detail/array_fwd.hpp>
 #include <boost/asio/detail/socket_types.hpp>
+#include <boost/asio/registered_buffer.hpp>
 
 #include <boost/asio/detail/push_options.hpp>
 
@@ -106,6 +107,7 @@ class buffer_sequence_adapter
 {
 public:
   enum { is_single_buffer = false };
+  enum { is_registered_buffer = false };
 
   explicit buffer_sequence_adapter(const Buffers& buffer_sequence)
     : count_(0), total_buffer_size_(0)
@@ -130,6 +132,11 @@ public:
     return total_buffer_size_;
   }
 
+  registered_buffer_id registered_id() const
+  {
+    return registered_buffer_id();
+  }
+
   bool all_empty() const
   {
     return total_buffer_size_ == 0;
@@ -249,6 +256,7 @@ class buffer_sequence_adapter<Buffer, boost::asio::mutable_buffer>
 {
 public:
   enum { is_single_buffer = true };
+  enum { is_registered_buffer = false };
 
   explicit buffer_sequence_adapter(
       const boost::asio::mutable_buffer& buffer_sequence)
@@ -272,6 +280,11 @@ public:
     return total_buffer_size_;
   }
 
+  registered_buffer_id registered_id() const
+  {
+    return registered_buffer_id();
+  }
+
   bool all_empty() const
   {
     return total_buffer_size_ == 0;
@@ -311,6 +324,7 @@ class buffer_sequence_adapter<Buffer, boost::asio::const_buffer>
 {
 public:
   enum { is_single_buffer = true };
+  enum { is_registered_buffer = false };
 
   explicit buffer_sequence_adapter(
       const boost::asio::const_buffer& buffer_sequence)
@@ -334,6 +348,11 @@ public:
     return total_buffer_size_;
   }
 
+  registered_buffer_id registered_id() const
+  {
+    return registered_buffer_id();
+  }
+
   bool all_empty() const
   {
     return total_buffer_size_ == 0;
@@ -375,6 +394,7 @@ class buffer_sequence_adapter<Buffer, boost::asio::mutable_buffers_1>
 {
 public:
   enum { is_single_buffer = true };
+  enum { is_registered_buffer = false };
 
   explicit buffer_sequence_adapter(
       const boost::asio::mutable_buffers_1& buffer_sequence)
@@ -398,6 +418,11 @@ public:
     return total_buffer_size_;
   }
 
+  registered_buffer_id registered_id() const
+  {
+    return registered_buffer_id();
+  }
+
   bool all_empty() const
   {
     return total_buffer_size_ == 0;
@@ -437,6 +462,7 @@ class buffer_sequence_adapter<Buffer, boost::asio::const_buffers_1>
 {
 public:
   enum { is_single_buffer = true };
+  enum { is_registered_buffer = false };
 
   explicit buffer_sequence_adapter(
       const boost::asio::const_buffers_1& buffer_sequence)
@@ -460,6 +486,11 @@ public:
     return total_buffer_size_;
   }
 
+  registered_buffer_id registered_id() const
+  {
+    return registered_buffer_id();
+  }
+
   bool all_empty() const
   {
     return total_buffer_size_ == 0;
@@ -495,12 +526,161 @@ private:
 
 #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
 
+template <typename Buffer>
+class buffer_sequence_adapter<Buffer, boost::asio::mutable_registered_buffer>
+  : buffer_sequence_adapter_base
+{
+public:
+  enum { is_single_buffer = true };
+  enum { is_registered_buffer = true };
+
+  explicit buffer_sequence_adapter(
+      const boost::asio::mutable_registered_buffer& buffer_sequence)
+  {
+    init_native_buffer(buffer_, buffer_sequence.buffer());
+    total_buffer_size_ = buffer_sequence.size();
+    registered_id_ = buffer_sequence.id();
+  }
+
+  native_buffer_type* buffers()
+  {
+    return &buffer_;
+  }
+
+  std::size_t count() const
+  {
+    return 1;
+  }
+
+  std::size_t total_size() const
+  {
+    return total_buffer_size_;
+  }
+
+  registered_buffer_id registered_id() const
+  {
+    return registered_id_;
+  }
+
+  bool all_empty() const
+  {
+    return total_buffer_size_ == 0;
+  }
+
+  static bool all_empty(
+      const boost::asio::mutable_registered_buffer& buffer_sequence)
+  {
+    return buffer_sequence.size() == 0;
+  }
+
+  static void validate(
+      const boost::asio::mutable_registered_buffer& buffer_sequence)
+  {
+    buffer_sequence.data();
+  }
+
+  static Buffer first(
+      const boost::asio::mutable_registered_buffer& buffer_sequence)
+  {
+    return Buffer(buffer_sequence.buffer());
+  }
+
+  enum { linearisation_storage_size = 1 };
+
+  static Buffer linearise(
+      const boost::asio::mutable_registered_buffer& buffer_sequence,
+      const Buffer&)
+  {
+    return Buffer(buffer_sequence.buffer());
+  }
+
+private:
+  native_buffer_type buffer_;
+  std::size_t total_buffer_size_;
+  registered_buffer_id registered_id_;
+};
+
+template <typename Buffer>
+class buffer_sequence_adapter<Buffer, boost::asio::const_registered_buffer>
+  : buffer_sequence_adapter_base
+{
+public:
+  enum { is_single_buffer = true };
+  enum { is_registered_buffer = true };
+
+  explicit buffer_sequence_adapter(
+      const boost::asio::const_registered_buffer& buffer_sequence)
+  {
+    init_native_buffer(buffer_, buffer_sequence.buffer());
+    total_buffer_size_ = buffer_sequence.size();
+    registered_id_ = buffer_sequence.id();
+  }
+
+  native_buffer_type* buffers()
+  {
+    return &buffer_;
+  }
+
+  std::size_t count() const
+  {
+    return 1;
+  }
+
+  std::size_t total_size() const
+  {
+    return total_buffer_size_;
+  }
+
+  registered_buffer_id registered_id() const
+  {
+    return registered_id_;
+  }
+
+  bool all_empty() const
+  {
+    return total_buffer_size_ == 0;
+  }
+
+  static bool all_empty(
+      const boost::asio::const_registered_buffer& buffer_sequence)
+  {
+    return buffer_sequence.size() == 0;
+  }
+
+  static void validate(
+      const boost::asio::const_registered_buffer& buffer_sequence)
+  {
+    buffer_sequence.data();
+  }
+
+  static Buffer first(
+      const boost::asio::const_registered_buffer& buffer_sequence)
+  {
+    return Buffer(buffer_sequence.buffer());
+  }
+
+  enum { linearisation_storage_size = 1 };
+
+  static Buffer linearise(
+      const boost::asio::const_registered_buffer& buffer_sequence,
+      const Buffer&)
+  {
+    return Buffer(buffer_sequence.buffer());
+  }
+
+private:
+  native_buffer_type buffer_;
+  std::size_t total_buffer_size_;
+  registered_buffer_id registered_id_;
+};
+
 template <typename Buffer, typename Elem>
 class buffer_sequence_adapter<Buffer, boost::array<Elem, 2> >
   : buffer_sequence_adapter_base
 {
 public:
   enum { is_single_buffer = false };
+  enum { is_registered_buffer = false };
 
   explicit buffer_sequence_adapter(
       const boost::array<Elem, 2>& buffer_sequence)
@@ -525,6 +705,11 @@ public:
     return total_buffer_size_;
   }
 
+  registered_buffer_id registered_id() const
+  {
+    return registered_buffer_id();
+  }
+
   bool all_empty() const
   {
     return total_buffer_size_ == 0;
@@ -573,6 +758,7 @@ class buffer_sequence_adapter<Buffer, std::array<Elem, 2> >
 {
 public:
   enum { is_single_buffer = false };
+  enum { is_registered_buffer = false };
 
   explicit buffer_sequence_adapter(
       const std::array<Elem, 2>& buffer_sequence)
@@ -597,6 +783,11 @@ public:
     return total_buffer_size_;
   }
 
+  registered_buffer_id registered_id() const
+  {
+    return registered_buffer_id();
+  }
+
   bool all_empty() const
   {
     return total_buffer_size_ == 0;

sources/boost/asio/detail/buffered_stream_storage.hpp

@@ -2,7 +2,7 @@
 // detail/buffered_stream_storage.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/bulk_executor_op.hpp

@@ -2,7 +2,7 @@
 // detail/bulk_executor_op.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/call_stack.hpp

@@ -2,7 +2,7 @@
 // detail/call_stack.hpp
 // ~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/chrono.hpp

@@ -2,7 +2,7 @@
 // detail/chrono.hpp
 // ~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/chrono_time_traits.hpp

@@ -2,7 +2,7 @@
 // detail/chrono_time_traits.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/completion_handler.hpp

@@ -2,7 +2,7 @@
 // detail/completion_handler.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/concurrency_hint.hpp

@@ -2,7 +2,7 @@
 // detail/concurrency_hint.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

sources/boost/asio/detail/conditionally_enabled_event.hpp

@@ -2,7 +2,7 @@
 // detail/conditionally_enabled_event.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)