// Boost.Geometry // Copyright (c) 2021, Oracle and/or its affiliates. // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle // Licensed under the Boost Software License version 1.0. // http://www.boost.org/users/license.html #ifndef BOOST_GEOMETRY_GEOMETRIES_ADAPTED_DETAIL_ANY_HPP #define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_DETAIL_ANY_HPP #include <utility> #include <boost/geometry/util/sequence.hpp> #include <boost/geometry/util/type_traits_std.hpp> namespace boost { namespace geometry { namespace detail { template < typename CastPolicy, typename TypeSequence, std::size_t N = util::sequence_size<TypeSequence>::value > struct visit_any { static const std::size_t M = N / 2; template <std::size_t Offset, typename Function, typename Any> static bool apply(Function && function, Any && any) { return visit_any<CastPolicy, TypeSequence, M>::template apply<Offset>( std::forward<Function>(function), std::forward<Any>(any)) || visit_any<CastPolicy, TypeSequence, N - M>::template apply<Offset + M>( std::forward<Function>(function), std::forward<Any>(any)); } }; template <typename CastPolicy, typename TypeSequence> struct visit_any<CastPolicy, TypeSequence, 1> { template <std::size_t Offset, typename Function, typename Any> static bool apply(Function && function, Any && any) { using elem_t = typename util::sequence_element<Offset, TypeSequence>::type; using geom_t = util::transcribe_const_t<std::remove_reference_t<Any>, elem_t>; geom_t * g = CastPolicy::template apply<geom_t>(&any); if (g != nullptr) { using geom_ref_t = std::conditional_t < std::is_rvalue_reference<decltype(any)>::value, geom_t&&, geom_t& >; function(static_cast<geom_ref_t>(*g)); return true; } else { return false; } } }; template <typename CastPolicy, typename TypeSequence> struct visit_any<CastPolicy, TypeSequence, 0> { template <std::size_t Offset, typename Function, typename Any> static bool apply(Function &&, Any &&) { return false; } }; } // namespace detail }} // namespace boost::geometry #endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_DETAIL_ANY_HPP