geometries/adapted/boost_variant2.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_GEOMETRIES_ADAPTED_BOOST_VARIANT2_HPP
0011 #define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_BOOST_VARIANT2_HPP
0012
0013
0014 #include <utility>
0015
0016 #include <boost/variant2/variant.hpp>
0017
0018 #include <boost/geometry/core/geometry_types.hpp>
0019 #include <boost/geometry/core/tag.hpp>
0020 #include <boost/geometry/core/tags.hpp>
0021 #include <boost/geometry/core/visit.hpp>
0022 #include <boost/geometry/util/sequence.hpp>
0023
0024
0025 namespace boost { namespace geometry
0026 {
0027
0028 namespace traits
0029 {
0030
0031 template <typename ...Ts>
0032 struct tag<boost::variant2::variant<Ts...>>
0033 {
0034     using type = dynamic_geometry_tag;
0035 };
0036
0037 template <typename ...Ts>
0038 struct visit<boost::variant2::variant<Ts...>>
0039 {
0040     template <typename Function, typename Variant>
0041     static void apply(Function && function, Variant && variant)
0042     {
0043         boost::variant2::visit(std::forward<Function>(function),
0044                                std::forward<Variant>(variant));
0045     }
0046 };
0047
0048 template <typename ...Ts, typename ...Us>
0049 struct visit<boost::variant2::variant<Ts...>, boost::variant2::variant<Us...>>
0050 {
0051     template <typename Function, typename Variant1, typename Variant2>
0052     static void apply(Function && function, Variant1 && variant1, Variant2 && variant2)
0053     {
0054         boost::variant2::visit(std::forward<Function>(function),
0055                                std::forward<Variant1>(variant1),
0056                                std::forward<Variant2>(variant2));
0057     }
0058 };
0059
0060 template <typename ...Ts>
0061 struct geometry_types<boost::variant2::variant<Ts...>>
0062 {
0063     using type = util::type_sequence<Ts...>;
0064 };
0065
0066
0067 } // namespace traits
0068
0069
0070 }} // namespace boost::geometry
0071
0072
0073 #endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_BOOST_VARIANT2_HPP