mirror of
https://github.com/msgpack/msgpack-c
synced 2026-06-08 16:11:40 +00:00
hiradyazdan
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
//
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// MessagePack for C++ static resolution routine
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//
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// Copyright (C) 2008-2018 FURUHASHI Sadayuki and KONDO Takatoshi
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef MSGPACK_V3_OBJECT_FWD_HPP
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#define MSGPACK_V3_OBJECT_FWD_HPP
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#include "msgpack/v3/object_fwd_decl.hpp"
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#include "msgpack/object_fwd.hpp"
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namespace msgpack {
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/// @cond
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MSGPACK_API_VERSION_NAMESPACE(v3) {
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/// @endcond
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#if !defined(MSGPACK_USE_CPP03)
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namespace adaptor {
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// If v2 has as specialization for T, then dispatch v2::adaptor::as<T>.
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// So I call v2::has_as<T> meta function intentionally.
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template <typename T>
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struct as<T, typename std::enable_if<v2::has_as<T>::value>::type> : v2::adaptor::as<T> {
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};
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} // namespace adaptor
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template <typename T>
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struct has_as {
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private:
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template <typename U>
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static auto check_(U*) ->
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typename std::enable_if<
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// check v3 specialization
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std::is_same<
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decltype(adaptor::as<U>()(std::declval<msgpack::object>())),
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U
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>::value
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// check v2 specialization
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v2::has_as<U>::value
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// check v1 specialization
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v1::has_as<U>::value,
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std::true_type
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>::type;
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template <typename...>
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static std::false_type check_(...);
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public:
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using type = decltype(check_<T>(MSGPACK_NULLPTR));
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static constexpr bool value = type::value;
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};
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#endif // !defined(MSGPACK_USE_CPP03)
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/// @cond
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} // MSGPACK_API_VERSION_NAMESPACE(v3)
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/// @endcond
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} // namespace msgpack
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#endif // MSGPACK_V3_OBJECT_FWD_HPP
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