81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
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// Boost.Geometry
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// Copyright (c) 2021, Oracle and/or its affiliates.
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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_GEOMETRIES_ADAPTED_STD_VARIANT_HPP
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#define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_STD_VARIANT_HPP
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#include <boost/config.hpp>
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#ifndef BOOST_NO_CXX17_HDR_VARIANT
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#include <utility>
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#include <variant>
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#include <boost/geometry/core/geometry_types.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/core/visit.hpp>
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#include <boost/geometry/util/sequence.hpp>
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namespace boost { namespace geometry
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{
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namespace traits
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{
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template <typename ...Ts>
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struct tag<std::variant<Ts...>>
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{
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using type = dynamic_geometry_tag;
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};
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template <typename ...Ts>
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struct visit<std::variant<Ts...>>
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{
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template <typename Function, typename Variant>
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static void apply(Function && function, Variant && variant)
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{
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std::visit(std::forward<Function>(function),
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std::forward<Variant>(variant));
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}
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};
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template <typename ...Ts, typename ...Us>
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struct visit<std::variant<Ts...>, std::variant<Us...>>
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{
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template <typename Function, typename Variant1, typename Variant2>
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static void apply(Function && function, Variant1 && variant1, Variant2 && variant2)
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{
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std::visit(std::forward<Function>(function),
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std::forward<Variant1>(variant1),
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std::forward<Variant2>(variant2));
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}
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};
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template <typename ...Ts>
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struct geometry_types<std::variant<Ts...>>
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{
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using type = util::type_sequence<Ts...>;
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};
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} // namespace traits
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}} // namespace boost::geometry
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#endif // BOOST_NO_CXX17_HDR_VARIANT
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#endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_STD_VARIANT_HPP
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