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74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
//
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// use_awaitable.hpp
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// ~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 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 BOOST_ASIO_USE_AWAITABLE_HPP
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#define BOOST_ASIO_USE_AWAITABLE_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 <boost/asio/detail/config.hpp>
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#if defined(BOOST_ASIO_HAS_CO_AWAIT) || defined(GENERATING_DOCUMENTATION)
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#include <boost/asio/awaitable.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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/// A completion token that represents the currently executing coroutine.
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/**
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* The @c use_awaitable_t class, with its value @c use_awaitable, is used to
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* represent the currently executing coroutine. This completion token may be
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* passed as a handler to an asynchronous operation. For example:
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*
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* @code awaitable<void> my_coroutine()
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* {
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* std::size_t n = co_await my_socket.async_read_some(buffer, use_awaitable);
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* ...
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* } @endcode
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*
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* When used with co_await, the initiating function (@c async_read_some in the
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* above example) suspends the current coroutine. The coroutine is resumed when
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* the asynchronous operation completes, and the result of the operation is
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* returned.
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*/
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template <typename Executor = executor>
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struct use_awaitable_t
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{
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BOOST_ASIO_CONSTEXPR use_awaitable_t()
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{
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}
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};
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/// A completion token object that represents the currently executing coroutine.
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/**
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* See the documentation for boost::asio::use_awaitable_t for a usage example.
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*/
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#if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
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constexpr use_awaitable_t<> use_awaitable;
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#elif defined(BOOST_ASIO_MSVC)
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__declspec(selectany) use_awaitable_t<> use_awaitable;
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#endif
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#include <boost/asio/impl/use_awaitable.hpp>
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT) || defined(GENERATING_DOCUMENTATION)
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#endif // BOOST_ASIO_USE_AWAITABLE_HPP
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