63e88f80
 Hu Chunming
提交三方库
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//
// prepend.hpp
// ~~~~~~~~~~~
//
// Copyright (c) 2003-2022 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_PREPEND_HPP
#define BOOST_ASIO_PREPEND_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
/// arguments should be passed additional values before the results of the
/// operation.
template <typename CompletionToken, typename... Values>
class prepend_t
{
public:
/// Constructor.
template <typename T, typename... V>
BOOST_ASIO_CONSTEXPR explicit prepend_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)...)
{
}
//private:
CompletionToken token_;
std::tuple<Values...> values_;
};
/// Completion token type used to specify that the completion handler
/// arguments should be passed additional values before the results of the
/// operation.
template <typename CompletionToken, typename... Values>
BOOST_ASIO_NODISCARD inline BOOST_ASIO_CONSTEXPR prepend_t<
typename decay<CompletionToken>::type, typename decay<Values>::type...>
prepend(BOOST_ASIO_MOVE_ARG(CompletionToken) completion_token,
BOOST_ASIO_MOVE_ARG(Values)... values)
{
return prepend_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/prepend.hpp>
#endif // (defined(BOOST_ASIO_HAS_STD_TUPLE)
// && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES))
// || defined(GENERATING_DOCUMENTATION)
#endif // BOOST_ASIO_PREPEND_HPP
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