boost/asio/impl/defer.hpp
// // impl/defer.hpp // ~~~~~~~~~~~~~~ // // Copyright (c) 2003-2021 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_IMPL_DEFER_HPP #define BOOST_ASIO_IMPL_DEFER_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/config.hpp> #include <boost/asio/associated_allocator.hpp> #include <boost/asio/associated_executor.hpp> #include <boost/asio/detail/work_dispatcher.hpp> #include <boost/asio/execution/allocator.hpp> #include <boost/asio/execution/blocking.hpp> #include <boost/asio/execution/relationship.hpp> #include <boost/asio/prefer.hpp> #include <boost/asio/require.hpp> #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { namespace detail { class initiate_defer { public: template <typename CompletionHandler> void operator()(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler, typename enable_if< execution::is_executor< typename associated_executor< typename decay<CompletionHandler>::type >::type >::value >::type* = 0) const { typedef typename decay<CompletionHandler>::type handler_t; typename associated_executor<handler_t>::type ex( (get_associated_executor)(handler)); typename associated_allocator<handler_t>::type alloc( (get_associated_allocator)(handler)); execution::execute( boost::asio::prefer( boost::asio::require(ex, execution::blocking.never), execution::relationship.continuation, execution::allocator(alloc)), BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler)); } template <typename CompletionHandler> void operator()(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler, typename enable_if< !execution::is_executor< typename associated_executor< typename decay<CompletionHandler>::type >::type >::value >::type* = 0) const { typedef typename decay<CompletionHandler>::type handler_t; typename associated_executor<handler_t>::type ex( (get_associated_executor)(handler)); typename associated_allocator<handler_t>::type alloc( (get_associated_allocator)(handler)); ex.defer(BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler), alloc); } }; template <typename Executor> class initiate_defer_with_executor { public: typedef Executor executor_type; explicit initiate_defer_with_executor(const Executor& ex) : ex_(ex) { } executor_type get_executor() const BOOST_ASIO_NOEXCEPT { return ex_; } template <typename CompletionHandler> void operator()(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler, typename enable_if< execution::is_executor< typename conditional<true, executor_type, CompletionHandler>::type >::value >::type* = 0, typename enable_if< !detail::is_work_dispatcher_required< typename decay<CompletionHandler>::type, Executor >::value >::type* = 0) const { typedef typename decay<CompletionHandler>::type handler_t; typename associated_allocator<handler_t>::type alloc( (get_associated_allocator)(handler)); execution::execute( boost::asio::prefer( boost::asio::require(ex_, execution::blocking.never), execution::relationship.continuation, execution::allocator(alloc)), BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler)); } template <typename CompletionHandler> void operator()(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler, typename enable_if< execution::is_executor< typename conditional<true, executor_type, CompletionHandler>::type >::value >::type* = 0, typename enable_if< detail::is_work_dispatcher_required< typename decay<CompletionHandler>::type, Executor >::value >::type* = 0) const { typedef typename decay<CompletionHandler>::type handler_t; typedef typename associated_executor< handler_t, Executor>::type handler_ex_t; handler_ex_t handler_ex((get_associated_executor)(handler, ex_)); typename associated_allocator<handler_t>::type alloc( (get_associated_allocator)(handler)); execution::execute( boost::asio::prefer( boost::asio::require(ex_, execution::blocking.never), execution::relationship.continuation, execution::allocator(alloc)), detail::work_dispatcher<handler_t, handler_ex_t>( BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler), handler_ex)); } template <typename CompletionHandler> void operator()(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler, typename enable_if< !execution::is_executor< typename conditional<true, executor_type, CompletionHandler>::type >::value >::type* = 0, typename enable_if< !detail::is_work_dispatcher_required< typename decay<CompletionHandler>::type, Executor >::value >::type* = 0) const { typedef typename decay<CompletionHandler>::type handler_t; typename associated_allocator<handler_t>::type alloc( (get_associated_allocator)(handler)); ex_.defer(BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler), alloc); } template <typename CompletionHandler> void operator()(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler, typename enable_if< !execution::is_executor< typename conditional<true, executor_type, CompletionHandler>::type >::value >::type* = 0, typename enable_if< detail::is_work_dispatcher_required< typename decay<CompletionHandler>::type, Executor >::value >::type* = 0) const { typedef typename decay<CompletionHandler>::type handler_t; typedef typename associated_executor< handler_t, Executor>::type handler_ex_t; handler_ex_t handler_ex((get_associated_executor)(handler, ex_)); typename associated_allocator<handler_t>::type alloc( (get_associated_allocator)(handler)); ex_.defer(detail::work_dispatcher<handler_t, handler_ex_t>( BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler), handler_ex), alloc); } private: Executor ex_; }; } // namespace detail template <BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken> BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) defer( BOOST_ASIO_MOVE_ARG(CompletionToken) token) { return async_initiate<CompletionToken, void()>( detail::initiate_defer(), token); } template <typename Executor, BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken> BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) defer( const Executor& ex, BOOST_ASIO_MOVE_ARG(CompletionToken) token, typename constraint< execution::is_executor<Executor>::value || is_executor<Executor>::value >::type) { return async_initiate<CompletionToken, void()>( detail::initiate_defer_with_executor<Executor>(ex), token); } template <typename ExecutionContext, BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken> inline BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) defer( ExecutionContext& ctx, BOOST_ASIO_MOVE_ARG(CompletionToken) token, typename constraint<is_convertible< ExecutionContext&, execution_context&>::value>::type) { return async_initiate<CompletionToken, void()>( detail::initiate_defer_with_executor< typename ExecutionContext::executor_type>( ctx.get_executor()), token); } } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #endif // BOOST_ASIO_IMPL_DEFER_HPP