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- //
- // consign.hpp
- // ~~~~~~~~~~
- //
- // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- #ifndef BOOST_ASIO_CONSIGN_HPP
- #define BOOST_ASIO_CONSIGN_HPP
- #if defined(_MSC_VER) && (_MSC_VER >= 1200)
- # pragma once
- #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
- #include <boost/asio/detail/config.hpp>
- #if (defined(BOOST_ASIO_HAS_STD_TUPLE) \
- && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)) \
- || defined(GENERATING_DOCUMENTATION)
- #include <tuple>
- #include <boost/asio/detail/type_traits.hpp>
- #include <boost/asio/detail/push_options.hpp>
- namespace boost {
- namespace asio {
- /// Completion token type used to specify that the completion handler should
- /// carry additional values along with it.
- /**
- * This completion token adapter is typically used to keep at least one copy of
- * an object, such as a smart pointer, alive until the completion handler is
- * called.
- */
- template <typename CompletionToken, typename... Values>
- class consign_t
- {
- public:
- /// Constructor.
- template <typename T, typename... V>
- BOOST_ASIO_CONSTEXPR explicit consign_t(
- BOOST_ASIO_MOVE_ARG(T) completion_token,
- BOOST_ASIO_MOVE_ARG(V)... values)
- : token_(BOOST_ASIO_MOVE_CAST(T)(completion_token)),
- values_(BOOST_ASIO_MOVE_CAST(V)(values)...)
- {
- }
- #if defined(GENERATING_DOCUMENTATION)
- private:
- #endif // defined(GENERATING_DOCUMENTATION)
- CompletionToken token_;
- std::tuple<Values...> values_;
- };
- /// Completion token adapter used to specify that the completion handler should
- /// carry additional values along with it.
- /**
- * This completion token adapter is typically used to keep at least one copy of
- * an object, such as a smart pointer, alive until the completion handler is
- * called.
- */
- template <typename CompletionToken, typename... Values>
- BOOST_ASIO_NODISCARD inline BOOST_ASIO_CONSTEXPR consign_t<
- typename decay<CompletionToken>::type, typename decay<Values>::type...>
- consign(BOOST_ASIO_MOVE_ARG(CompletionToken) completion_token,
- BOOST_ASIO_MOVE_ARG(Values)... values)
- {
- return consign_t<
- typename decay<CompletionToken>::type, typename decay<Values>::type...>(
- BOOST_ASIO_MOVE_CAST(CompletionToken)(completion_token),
- BOOST_ASIO_MOVE_CAST(Values)(values)...);
- }
- } // namespace asio
- } // namespace boost
- #include <boost/asio/detail/pop_options.hpp>
- #include <boost/asio/impl/consign.hpp>
- #endif // (defined(BOOST_ASIO_HAS_STD_TUPLE)
- // && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES))
- // || defined(GENERATING_DOCUMENTATION)
- #endif // BOOST_ASIO_CONSIGN_HPP
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