215 lines
6.7 KiB
C++
215 lines
6.7 KiB
C++
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014-2021, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_STRATEGIES_COMPARABLE_DISTANCE_RESULT_HPP
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#define BOOST_GEOMETRY_STRATEGIES_COMPARABLE_DISTANCE_RESULT_HPP
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#include <boost/geometry/algorithms/detail/select_geometry_type.hpp>
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#include <boost/geometry/core/point_type.hpp>
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#include <boost/geometry/core/reverse_dispatch.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/strategies/distance.hpp>
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#include <boost/geometry/strategies/distance/services.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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namespace resolve_strategy
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{
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// TODO: This utility could be entirely implemented as:
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// decltype(geometry::comparable_distance(std::declval<Geometry1>(), std::declval<Geometry2>(), std::declval<Strategy>()))
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// however then the algorithm would have to be compiled.
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template
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<
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typename Geometry1, typename Geometry2, typename Strategy,
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bool IsUmbrella = strategies::detail::is_umbrella_strategy<Strategy>::value
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>
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struct comparable_distance_strategy2_type
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{
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typedef decltype(std::declval<Strategy>().distance(
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std::declval<Geometry1>(), std::declval<Geometry2>())) type;
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};
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct comparable_distance_strategy2_type<Geometry1, Geometry2, Strategy, false>
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{
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typedef Strategy type;
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};
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template
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<
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typename Geometry1, typename Geometry2, typename Strategy,
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bool Reverse = reverse_dispatch<Geometry1, Geometry2>::type::value
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>
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struct comparable_distance_strategy_type
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: strategy::distance::services::comparable_type
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<
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typename comparable_distance_strategy2_type
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<
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Geometry1, Geometry2, Strategy
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>::type
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>
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{};
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct comparable_distance_strategy_type<Geometry1, Geometry2, Strategy, true>
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: comparable_distance_strategy_type<Geometry2, Geometry1, Strategy, false>
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{};
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct comparable_distance_result
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: strategy::distance::services::return_type
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<
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typename comparable_distance_strategy_type<Geometry1, Geometry2, Strategy>::type,
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typename point_type<Geometry1>::type,
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typename point_type<Geometry2>::type
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>
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{};
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template <typename Geometry1, typename Geometry2>
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struct comparable_distance_result<Geometry1, Geometry2, default_strategy>
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: comparable_distance_result
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<
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Geometry1,
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Geometry2,
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typename strategies::distance::services::default_strategy
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<
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Geometry1, Geometry2
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>::type
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>
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{};
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} // namespace resolve_strategy
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace distance
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{
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template <typename Strategy = geometry::default_strategy>
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struct more_precise_comparable_distance_result
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{
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template <typename Curr, typename Next>
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struct predicate
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: std::is_same
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<
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typename resolve_strategy::comparable_distance_result
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<
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typename util::sequence_element<0, Curr>::type,
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typename util::sequence_element<1, Curr>::type,
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Strategy
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>::type,
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typename geometry::select_most_precise
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<
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typename resolve_strategy::comparable_distance_result
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<
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typename util::sequence_element<0, Curr>::type,
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typename util::sequence_element<1, Curr>::type,
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Strategy
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>::type,
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typename resolve_strategy::comparable_distance_result
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<
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typename util::sequence_element<0, Next>::type,
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typename util::sequence_element<1, Next>::type,
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Strategy
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>::type
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>::type
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>
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{};
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};
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}} // namespace detail::distance
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#endif //DOXYGEN_NO_DETAIL
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namespace resolve_dynamic
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{
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template
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<
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typename Geometry1, typename Geometry2, typename Strategy,
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bool IsDynamicOrCollection = util::is_dynamic_geometry<Geometry1>::value
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|| util::is_dynamic_geometry<Geometry2>::value
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|| util::is_geometry_collection<Geometry1>::value
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|| util::is_geometry_collection<Geometry2>::value
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>
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struct comparable_distance_result
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: resolve_strategy::comparable_distance_result
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<
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Geometry1,
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Geometry2,
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Strategy
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>
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{};
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct comparable_distance_result<Geometry1, Geometry2, Strategy, true>
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{
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// Select the most precise distance strategy result type
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// for all variant type combinations.
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// TODO: We should ignore the combinations that are not valid
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// but is_implemented is not ready for prime time.
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using selected_types = typename detail::select_geometry_types
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<
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Geometry1, Geometry2,
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detail::distance::more_precise_comparable_distance_result<Strategy>::template predicate
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>::type;
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using type = typename resolve_strategy::comparable_distance_result
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<
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typename util::sequence_element<0, selected_types>::type,
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typename util::sequence_element<1, selected_types>::type,
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Strategy
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>::type;
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};
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} // namespace resolve_dynamic
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/*!
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\brief Meta-function defining return type of comparable_distance function
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\ingroup distance
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*/
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template
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<
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typename Geometry1,
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typename Geometry2 = Geometry1,
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typename Strategy = void
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>
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struct comparable_distance_result
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: resolve_dynamic::comparable_distance_result
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<
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Geometry1, Geometry2, Strategy
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>
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{};
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template <typename Geometry1, typename Geometry2>
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struct comparable_distance_result<Geometry1, Geometry2, void>
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: comparable_distance_result<Geometry1, Geometry2, default_strategy>
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{};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGIES_COMPARABLE_DISTANCE_RESULT_HPP
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