90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2014.
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// Modifications copyright (c) 2014, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
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#define BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/util/compress_variant.hpp>
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#include <boost/geometry/util/select_most_precise.hpp>
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#include <boost/geometry/util/transform_variant.hpp>
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namespace boost { namespace geometry
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{
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namespace resolve_strategy
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{
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template <typename Geometry>
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struct default_length_result
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{
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typedef typename select_most_precise
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<
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typename coordinate_type<Geometry>::type,
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long double
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>::type type;
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};
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} // namespace resolve_strategy
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namespace resolve_variant
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{
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template <typename Geometry>
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struct default_length_result
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: resolve_strategy::default_length_result<Geometry>
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{};
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template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
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struct default_length_result<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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{
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typedef typename compress_variant<
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typename transform_variant<
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>,
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resolve_strategy::default_length_result<boost::mpl::placeholders::_>
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>::type
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>::type type;
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};
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} // namespace resolve_variant
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/*!
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\brief Meta-function defining return type of length function
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\ingroup length
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\note Length of a line of integer coordinates can be double.
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So we take at least a double. If Big Number types are used,
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we take that type.
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*/
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template <typename Geometry>
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struct default_length_result
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: resolve_variant::default_length_result<Geometry>
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{};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
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