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79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
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//
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// prepend.hpp
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// ~~~~~~~~~~~
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//
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// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_PREPEND_HPP
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#define ASIO_PREPEND_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if (defined(ASIO_HAS_STD_TUPLE) \
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&& defined(ASIO_HAS_VARIADIC_TEMPLATES)) \
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|| defined(GENERATING_DOCUMENTATION)
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#include <tuple>
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#include "asio/detail/type_traits.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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/// Completion token type used to specify that the completion handler
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/// arguments should be passed additional values before the results of the
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/// operation.
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template <typename CompletionToken, typename... Values>
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class prepend_t
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{
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public:
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/// Constructor.
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template <typename T, typename... V>
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ASIO_CONSTEXPR explicit prepend_t(
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ASIO_MOVE_ARG(T) completion_token,
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ASIO_MOVE_ARG(V)... values)
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: token_(ASIO_MOVE_CAST(T)(completion_token)),
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values_(ASIO_MOVE_CAST(V)(values)...)
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{
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}
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//private:
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CompletionToken token_;
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std::tuple<Values...> values_;
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};
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/// Completion token type used to specify that the completion handler
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/// arguments should be passed additional values before the results of the
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/// operation.
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template <typename CompletionToken, typename... Values>
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ASIO_NODISCARD inline ASIO_CONSTEXPR prepend_t<
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typename decay<CompletionToken>::type, typename decay<Values>::type...>
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prepend(ASIO_MOVE_ARG(CompletionToken) completion_token,
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ASIO_MOVE_ARG(Values)... values)
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{
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return prepend_t<
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typename decay<CompletionToken>::type, typename decay<Values>::type...>(
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ASIO_MOVE_CAST(CompletionToken)(completion_token),
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ASIO_MOVE_CAST(Values)(values)...);
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}
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#include "asio/impl/prepend.hpp"
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#endif // (defined(ASIO_HAS_STD_TUPLE)
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// && defined(ASIO_HAS_VARIADIC_TEMPLATES))
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// || defined(GENERATING_DOCUMENTATION)
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#endif // ASIO_PREPEND_HPP
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