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- #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_DISTANCE_INTERFACE_HPP
- #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_DISTANCE_INTERFACE_HPP
- #include <boost/concept_check.hpp>
- #include <boost/geometry/algorithms/detail/throw_on_empty_input.hpp>
- #include <boost/geometry/algorithms/dispatch/distance.hpp>
- #include <boost/geometry/core/point_type.hpp>
- #include <boost/geometry/core/visit.hpp>
- #include <boost/geometry/geometries/adapted/boost_variant.hpp> // For backward compatibility
- #include <boost/geometry/geometries/concepts/check.hpp>
- #include <boost/geometry/strategies/default_distance_result.hpp>
- #include <boost/geometry/strategies/distance_result.hpp>
- #include <boost/geometry/strategies/default_strategy.hpp>
- #include <boost/geometry/strategies/detail.hpp>
- #include <boost/geometry/strategies/distance/services.hpp>
- namespace boost { namespace geometry
- {
- #ifndef DOXYGEN_NO_DISPATCH
- namespace dispatch
- {
- template
- <
- typename Geometry1, typename Geometry2, typename Strategy,
- typename Tag1, typename Tag2, typename StrategyTag
- >
- struct distance
- <
- Geometry1, Geometry2, Strategy,
- Tag1, Tag2, StrategyTag,
- true
- >
- : distance<Geometry2, Geometry1, Strategy, Tag2, Tag1, StrategyTag, false>
- {
- static inline auto apply(Geometry1 const& g1, Geometry2 const& g2,
- Strategy const& strategy)
- {
- return distance
- <
- Geometry2, Geometry1, Strategy,
- Tag2, Tag1, StrategyTag,
- false
- >::apply(g2, g1, strategy);
- }
- };
- }
- #endif
- namespace resolve_strategy
- {
- template
- <
- typename Strategy,
- bool IsUmbrella = strategies::detail::is_umbrella_strategy<Strategy>::value
- >
- struct distance
- {
- template <typename Geometry1, typename Geometry2>
- static inline auto apply(Geometry1 const& geometry1,
- Geometry2 const& geometry2,
- Strategy const& strategy)
- {
- return dispatch::distance
- <
- Geometry1, Geometry2, Strategy
- >::apply(geometry1, geometry2, strategy);
- }
- };
- template <typename Strategy>
- struct is_strategy_converter_specialized
- {
- typedef strategies::distance::services::strategy_converter<Strategy> converter;
- static const bool value = ! std::is_same
- <
- decltype(converter::get(std::declval<Strategy>())),
- strategies::detail::not_implemented
- >::value;
- };
- template <typename Strategy>
- struct distance<Strategy, false>
- {
- template
- <
- typename Geometry1, typename Geometry2, typename S,
- std::enable_if_t<is_strategy_converter_specialized<S>::value, int> = 0
- >
- static inline auto apply(Geometry1 const& geometry1,
- Geometry2 const& geometry2,
- S const& strategy)
- {
- typedef strategies::distance::services::strategy_converter<Strategy> converter;
- typedef decltype(converter::get(strategy)) strategy_type;
- return dispatch::distance
- <
- Geometry1, Geometry2, strategy_type
- >::apply(geometry1, geometry2, converter::get(strategy));
- }
- template
- <
- typename Geometry1, typename Geometry2, typename S,
- std::enable_if_t<! is_strategy_converter_specialized<S>::value, int> = 0
- >
- static inline auto apply(Geometry1 const& geometry1,
- Geometry2 const& geometry2,
- S const& strategy)
- {
- typedef strategies::distance::services::custom_strategy_converter
- <
- Geometry1, Geometry2, Strategy
- > converter;
- typedef decltype(converter::get(strategy)) strategy_type;
- return dispatch::distance
- <
- Geometry1, Geometry2, strategy_type
- >::apply(geometry1, geometry2, converter::get(strategy));
- }
- };
- template <>
- struct distance<default_strategy, false>
- {
- template <typename Geometry1, typename Geometry2>
- static inline auto apply(Geometry1 const& geometry1,
- Geometry2 const& geometry2,
- default_strategy)
- {
- typedef typename strategies::distance::services::default_strategy
- <
- Geometry1, Geometry2
- >::type strategy_type;
- return dispatch::distance
- <
- Geometry1, Geometry2, strategy_type
- >::apply(geometry1, geometry2, strategy_type());
- }
- };
- }
- namespace resolve_dynamic
- {
- template
- <
- typename Geometry1, typename Geometry2,
- typename Tag1 = typename geometry::tag<Geometry1>::type,
- typename Tag2 = typename geometry::tag<Geometry2>::type
- >
- struct distance
- {
- template <typename Strategy>
- static inline auto apply(Geometry1 const& geometry1,
- Geometry2 const& geometry2,
- Strategy const& strategy)
- {
- return resolve_strategy::distance
- <
- Strategy
- >::apply(geometry1, geometry2, strategy);
- }
- };
- template <typename DynamicGeometry1, typename Geometry2, typename Tag2>
- struct distance<DynamicGeometry1, Geometry2, dynamic_geometry_tag, Tag2>
- {
- template <typename Strategy>
- static inline auto apply(DynamicGeometry1 const& geometry1,
- Geometry2 const& geometry2,
- Strategy const& strategy)
- {
- using result_t = typename geometry::distance_result<DynamicGeometry1, Geometry2, Strategy>::type;
- result_t result = 0;
- traits::visit<DynamicGeometry1>::apply([&](auto const& g1)
- {
- result = resolve_strategy::distance
- <
- Strategy
- >::apply(g1, geometry2, strategy);
- }, geometry1);
- return result;
- }
- };
- template <typename Geometry1, typename DynamicGeometry2, typename Tag1>
- struct distance<Geometry1, DynamicGeometry2, Tag1, dynamic_geometry_tag>
- {
- template <typename Strategy>
- static inline auto apply(Geometry1 const& geometry1,
- DynamicGeometry2 const& geometry2,
- Strategy const& strategy)
- {
- using result_t = typename geometry::distance_result<Geometry1, DynamicGeometry2, Strategy>::type;
- result_t result = 0;
- traits::visit<DynamicGeometry2>::apply([&](auto const& g2)
- {
- result = resolve_strategy::distance
- <
- Strategy
- >::apply(geometry1, g2, strategy);
- }, geometry2);
- return result;
- }
- };
- template <typename DynamicGeometry1, typename DynamicGeometry2>
- struct distance<DynamicGeometry1, DynamicGeometry2, dynamic_geometry_tag, dynamic_geometry_tag>
- {
- template <typename Strategy>
- static inline auto apply(DynamicGeometry1 const& geometry1,
- DynamicGeometry2 const& geometry2,
- Strategy const& strategy)
- {
- using result_t = typename geometry::distance_result<DynamicGeometry1, DynamicGeometry2, Strategy>::type;
- result_t result = 0;
- traits::visit<DynamicGeometry1, DynamicGeometry2>::apply([&](auto const& g1, auto const& g2)
- {
- result = resolve_strategy::distance
- <
- Strategy
- >::apply(g1, g2, strategy);
- }, geometry1, geometry2);
- return result;
- }
- };
- }
- template <typename Geometry1, typename Geometry2, typename Strategy>
- inline auto distance(Geometry1 const& geometry1,
- Geometry2 const& geometry2,
- Strategy const& strategy)
- {
- concepts::check<Geometry1 const>();
- concepts::check<Geometry2 const>();
- detail::throw_on_empty_input(geometry1);
- detail::throw_on_empty_input(geometry2);
- return resolve_dynamic::distance
- <
- Geometry1,
- Geometry2
- >::apply(geometry1, geometry2, strategy);
- }
- template <typename Geometry1, typename Geometry2>
- inline auto distance(Geometry1 const& geometry1,
- Geometry2 const& geometry2)
- {
- return geometry::distance(geometry1, geometry2, default_strategy());
- }
- }}
- #endif
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