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91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
//
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// co_spawn.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_CO_SPAWN_HPP
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#define BOOST_ASIO_CO_SPAWN_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/execution_context.hpp>
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#include <boost/asio/is_executor.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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namespace detail {
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template <typename T>
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struct awaitable_signature;
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template <typename T, typename Executor>
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struct awaitable_signature<awaitable<T, Executor>>
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{
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typedef void type(std::exception_ptr, T);
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};
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template <typename Executor>
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struct awaitable_signature<awaitable<void, Executor>>
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{
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typedef void type(std::exception_ptr);
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};
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} // namespace detail
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/// Spawn a new thread of execution.
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/**
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* The entry point function object @c f must have the signature:
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*
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* @code awaitable<void, E> f(); @endcode
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*
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* where @c E is convertible from @c Executor.
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*/
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template <typename Executor, typename F, typename CompletionToken>
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BOOST_ASIO_INITFN_RESULT_TYPE(CompletionToken,
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typename detail::awaitable_signature<typename result_of<F()>::type>::type)
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co_spawn(const Executor& ex, F&& f, CompletionToken&& token,
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typename enable_if<
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is_executor<Executor>::value
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>::type* = 0);
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/// Spawn a new thread of execution.
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/**
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* The entry point function object @c f must have the signature:
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*
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* @code awaitable<void, E> f(); @endcode
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*
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* where @c E is convertible from @c ExecutionContext::executor_type.
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*/
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template <typename ExecutionContext, typename F, typename CompletionToken>
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BOOST_ASIO_INITFN_RESULT_TYPE(CompletionToken,
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typename detail::awaitable_signature<typename result_of<F()>::type>::type)
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co_spawn(ExecutionContext& ctx, F&& f, CompletionToken&& token,
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typename enable_if<
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is_convertible<ExecutionContext&, execution_context&>::value
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>::type* = 0);
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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/co_spawn.hpp>
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#endif // defined(BOOST_ASIO_HAS_CO_AWAIT) || defined(GENERATING_DOCUMENTATION)
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#endif // BOOST_ASIO_CO_SPAWN_HPP
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