88 lines
2.3 KiB
C++
88 lines
2.3 KiB
C++
// 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_DETAIL_ANY_HPP
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#define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_DETAIL_ANY_HPP
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#include <utility>
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#include <boost/geometry/util/sequence.hpp>
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#include <boost/geometry/util/type_traits_std.hpp>
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namespace boost { namespace geometry
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{
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namespace detail
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{
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template
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<
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typename CastPolicy,
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typename TypeSequence,
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std::size_t N = util::sequence_size<TypeSequence>::value
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>
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struct visit_any
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{
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static const std::size_t M = N / 2;
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template <std::size_t Offset, typename Function, typename Any>
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static bool apply(Function && function, Any && any)
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{
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return visit_any<CastPolicy, TypeSequence, M>::template apply<Offset>(
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std::forward<Function>(function), std::forward<Any>(any))
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|| visit_any<CastPolicy, TypeSequence, N - M>::template apply<Offset + M>(
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std::forward<Function>(function), std::forward<Any>(any));
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}
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};
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template <typename CastPolicy, typename TypeSequence>
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struct visit_any<CastPolicy, TypeSequence, 1>
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{
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template <std::size_t Offset, typename Function, typename Any>
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static bool apply(Function && function, Any && any)
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{
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using elem_t = typename util::sequence_element<Offset, TypeSequence>::type;
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using geom_t = util::transcribe_const_t<std::remove_reference_t<Any>, elem_t>;
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geom_t * g = CastPolicy::template apply<geom_t>(&any);
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if (g != nullptr)
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{
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using geom_ref_t = std::conditional_t
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<
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std::is_rvalue_reference<decltype(any)>::value,
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geom_t&&, geom_t&
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>;
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function(static_cast<geom_ref_t>(*g));
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return true;
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}
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else
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{
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return false;
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}
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}
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};
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template <typename CastPolicy, typename TypeSequence>
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struct visit_any<CastPolicy, TypeSequence, 0>
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{
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template <std::size_t Offset, typename Function, typename Any>
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static bool apply(Function &&, Any &&)
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{
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return false;
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}
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};
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} // namespace detail
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_DETAIL_ANY_HPP
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