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+//
+// detail/work_dispatcher.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 ASIO_DETAIL_WORK_DISPATCHER_HPP
+#define ASIO_DETAIL_WORK_DISPATCHER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/associated_executor.hpp"
+#include "asio/associated_allocator.hpp"
+#include "asio/executor_work_guard.hpp"
+#include "asio/execution/executor.hpp"
+#include "asio/execution/allocator.hpp"
+#include "asio/execution/blocking.hpp"
+#include "asio/execution/outstanding_work.hpp"
+#include "asio/prefer.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Handler, typename Executor, typename = void>
+struct is_work_dispatcher_required : true_type
+{
+};
+
+template <typename Handler, typename Executor>
+struct is_work_dispatcher_required<Handler, Executor,
+ typename enable_if<
+ is_same<
+ typename associated_executor<Handler,
+ Executor>::asio_associated_executor_is_unspecialised,
+ void
+ >::value
+ >::type> : false_type
+{
+};
+
+template <typename Handler, typename Executor, typename = void>
+class work_dispatcher
+{
+public:
+ template <typename CompletionHandler>
+ work_dispatcher(ASIO_MOVE_ARG(CompletionHandler) handler,
+ const Executor& handler_ex)
+ : handler_(ASIO_MOVE_CAST(CompletionHandler)(handler)),
+ executor_(asio::prefer(handler_ex,
+ execution::outstanding_work.tracked))
+ {
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ work_dispatcher(const work_dispatcher& other)
+ : handler_(other.handler_),
+ executor_(other.executor_)
+ {
+ }
+
+ work_dispatcher(work_dispatcher&& other)
+ : handler_(ASIO_MOVE_CAST(Handler)(other.handler_)),
+ executor_(ASIO_MOVE_CAST(work_executor_type)(other.executor_))
+ {
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ void operator()()
+ {
+ execution::execute(
+ asio::prefer(executor_,
+ execution::blocking.possibly,
+ execution::allocator((get_associated_allocator)(handler_))),
+ asio::detail::bind_handler(
+ ASIO_MOVE_CAST(Handler)(handler_)));
+ }
+
+private:
+ typedef typename decay<
+ typename prefer_result<const Executor&,
+ execution::outstanding_work_t::tracked_t
+ >::type
+ >::type work_executor_type;
+
+ Handler handler_;
+ work_executor_type executor_;
+};
+
+#if !defined(ASIO_NO_TS_EXECUTORS)
+
+template <typename Handler, typename Executor>
+class work_dispatcher<Handler, Executor,
+ typename enable_if<!execution::is_executor<Executor>::value>::type>
+{
+public:
+ template <typename CompletionHandler>
+ work_dispatcher(ASIO_MOVE_ARG(CompletionHandler) handler,
+ const Executor& handler_ex)
+ : work_(handler_ex),
+ handler_(ASIO_MOVE_CAST(CompletionHandler)(handler))
+ {
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ work_dispatcher(const work_dispatcher& other)
+ : work_(other.work_),
+ handler_(other.handler_)
+ {
+ }
+
+ work_dispatcher(work_dispatcher&& other)
+ : work_(ASIO_MOVE_CAST(executor_work_guard<Executor>)(other.work_)),
+ handler_(ASIO_MOVE_CAST(Handler)(other.handler_))
+ {
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ void operator()()
+ {
+ typename associated_allocator<Handler>::type alloc(
+ (get_associated_allocator)(handler_));
+ work_.get_executor().dispatch(
+ asio::detail::bind_handler(
+ ASIO_MOVE_CAST(Handler)(handler_)), alloc);
+ work_.reset();
+ }
+
+private:
+ executor_work_guard<Executor> work_;
+ Handler handler_;
+};
+
+#endif // !defined(ASIO_NO_TS_EXECUTORS)
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WORK_DISPATCHER_HPP