147 lines
3.8 KiB
C++
147 lines
3.8 KiB
C++
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// Boost.Geometry
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// Copyright (c) 2017 Adam Wulkiewicz, Lodz, Poland.
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// This file was modified by Oracle on 2020-2021.
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// Modifications copyright (c) 2020-2021 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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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_ALGORITHMS_AREA_RESULT_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_AREA_RESULT_HPP
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#include <type_traits>
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#include <boost/geometry/algorithms/detail/select_geometry_type.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/cs.hpp>
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#include <boost/geometry/core/geometry_types.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/strategies/area/services.hpp>
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#include <boost/geometry/strategies/default_strategy.hpp>
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#include <boost/geometry/strategies/detail.hpp>
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#include <boost/geometry/util/select_most_precise.hpp>
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#include <boost/geometry/util/sequence.hpp>
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#include <boost/geometry/util/type_traits.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace area
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{
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template
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<
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typename Geometry,
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typename Strategy,
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bool IsUmbrella = strategies::detail::is_umbrella_strategy<Strategy>::value
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>
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struct area_result
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{
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typedef decltype(std::declval<Strategy>().area(std::declval<Geometry>())) strategy_type;
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typedef typename strategy_type::template result_type<Geometry>::type type;
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};
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template <typename Geometry, typename Strategy>
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struct area_result<Geometry, Strategy, false>
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{
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typedef typename Strategy::template result_type<Geometry>::type type;
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};
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template <typename Geometry>
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struct default_area_result
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: area_result
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<
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Geometry,
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typename geometry::strategies::area::services::default_strategy
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<
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Geometry
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>::type
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>
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{};
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template <typename Curr, typename Next>
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struct more_precise_coordinate_type
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: std::is_same
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<
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typename geometry::coordinate_type<Curr>::type,
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typename geometry::select_most_precise
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<
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typename geometry::coordinate_type<Curr>::type,
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typename geometry::coordinate_type<Next>::type
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>::type
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>
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{};
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template <typename Curr, typename Next>
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struct more_precise_default_area_result
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: std::is_same
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<
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typename default_area_result<Curr>::type,
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typename geometry::select_most_precise
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<
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typename default_area_result<Curr>::type,
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typename default_area_result<Next>::type
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>::type
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>
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{};
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}} // namespace detail::area
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#endif //DOXYGEN_NO_DETAIL
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/*!
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\brief Meta-function defining return type of area function
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\ingroup area
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\note The return-type is defined by Geometry and Strategy
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*/
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template
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<
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typename Geometry,
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typename Strategy = default_strategy
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>
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struct area_result
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: detail::area::area_result
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<
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typename detail::select_geometry_type
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<
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Geometry,
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detail::area::more_precise_coordinate_type
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>::type,
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Strategy
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>
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{};
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template <typename Geometry>
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struct area_result<Geometry, default_strategy>
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: detail::area::default_area_result
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<
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typename detail::select_geometry_type
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<
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Geometry,
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detail::area::more_precise_default_area_result
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>::type
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>
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{};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_AREA_RESULT_HPP
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