67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
//
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// prepend.hpp
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// ~~~~~~~~~~~
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//
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// Copyright (c) 2003-2024 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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#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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constexpr explicit prepend_t(T&& completion_token, V&&... values)
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: token_(static_cast<T&&>(completion_token)),
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values_(static_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 constexpr
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prepend_t<decay_t<CompletionToken>, decay_t<Values>...>
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prepend(CompletionToken&& completion_token,
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Values&&... values)
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{
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return prepend_t<decay_t<CompletionToken>, decay_t<Values>...>(
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static_cast<CompletionToken&&>(completion_token),
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static_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 // ASIO_PREPEND_HPP
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