detail/closest_points/utilities.hpp

0001 // Boost.Geometry
0002
0003 // Copyright (c) 2021-2023, Oracle and/or its affiliates.
0004
0005 // Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
0006
0007 // Licensed under the Boost Software License version 1.0.
0008 // http://www.boost.org/users/license.html
0009
0010 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_CLOSEST_POINTS_UTILITIES_HPP
0011 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_CLOSEST_POINTS_UTILITIES_HPP
0012
0013 #include <boost/geometry/algorithms/detail/assign_indexed_point.hpp>
0014 #include <boost/geometry/util/algorithm.hpp>
0015
0016 #include <boost/geometry/strategies/distance.hpp>
0017
0018 namespace boost { namespace geometry
0019 {
0020
0021 namespace detail { namespace closest_points
0022 {
0023
0024 struct set_segment_from_points
0025 {
0026     template <typename Point1, typename Point2, typename Segment>
0027     static inline void apply(Point1 const& p1, Point2 const& p2, Segment& segment)
0028     {
0029         assign_point_to_index<0>(p1, segment);
0030         assign_point_to_index<1>(p2, segment);
0031     }
0032 };
0033
0034
0035 struct swap_segment_points
0036 {
0037     template <typename Segment>
0038     static inline void apply(Segment& segment)
0039     {
0040         geometry::detail::for_each_dimension<Segment>([&](auto index)
0041         {
0042             auto temp = get<0,index>(segment);
0043             set<0,index>(segment, get<1,index>(segment));
0044             set<1,index>(segment, temp);
0045         });
0046     }
0047 };
0048
0049 template <typename Geometry1, typename Geometry2, typename Strategies>
0050 using distance_strategy_t = decltype(
0051     std::declval<Strategies>().distance(std::declval<Geometry1>(), std::declval<Geometry2>()));
0052
0053 template <typename Geometry1, typename Geometry2, typename Strategies>
0054 using creturn_t = typename strategy::distance::services::return_type
0055     <
0056         typename strategy::distance::services::comparable_type
0057             <
0058                 distance_strategy_t<Geometry1, Geometry2, Strategies>
0059             >::type,
0060         typename point_type<Geometry1>::type,
0061         typename point_type<Geometry2>::type
0062     >::type;
0063
0064
0065 }} // namespace detail::closest_points
0066
0067 }} // namespace boost::geometry
0068
0069 #endif //BOOST_GEOMETRY_ALGORITHMS_DETAIL_CLOSEST_POINTS_UTILITIES_HPP