detail/distance/strategy_utils.hpp

0001 // Boost.Geometry
0002
0003 // Copyright (c) 2021, Oracle and/or its affiliates.
0004
0005 // Contributed and/or modified by Adam Wulkiewicz, 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_ALGORITHS_DETAIL_DISTANCE_STRATEGY_UTILS_HPP
0011 #define BOOST_GEOMETRY_ALGORITHS_DETAIL_DISTANCE_STRATEGY_UTILS_HPP
0012
0013
0014 #include <utility>
0015
0016 #include <boost/geometry/core/point_type.hpp>
0017
0018 #include <boost/geometry/strategies/distance.hpp>
0019
0020
0021 namespace boost { namespace geometry
0022 {
0023
0024 #ifndef DOXYGEN_NO_DETAIL
0025 namespace detail { namespace distance
0026 {
0027
0028
0029 template <typename Geometry1, typename Geometry2, typename Strategies>
0030 using strategy_t = decltype(
0031     std::declval<Strategies>().distance(std::declval<Geometry1>(), std::declval<Geometry2>()));
0032
0033
0034 template <typename Geometry1, typename Geometry2, typename Strategies>
0035 using return_t = typename strategy::distance::services::return_type
0036     <
0037         strategy_t<Geometry1, Geometry2, Strategies>,
0038         point_type_t<Geometry1>,
0039         point_type_t<Geometry2>
0040     >::type;
0041
0042
0043 template <typename Geometry1, typename Geometry2, typename Strategies>
0044 using cstrategy_t = typename strategy::distance::services::comparable_type
0045     <
0046         strategy_t<Geometry1, Geometry2, Strategies>
0047     >::type;
0048
0049
0050 template <typename Geometry1, typename Geometry2, typename Strategies>
0051 using creturn_t = typename strategy::distance::services::return_type
0052     <
0053         cstrategy_t<Geometry1, Geometry2, Strategies>,
0054         point_type_t<Geometry1>,
0055         point_type_t<Geometry2>
0056     >::type;
0057
0058
0059 }} // namespace detail::distance
0060 #endif // DOXYGEN_NO_DETAIL
0061
0062 }} // namespace boost::geometry
0063
0064 #endif // BOOST_GEOMETRY_ALGORITHS_DETAIL_DISTANCE_STRATEGY_UTILS_HPP