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- //
- // detail/handler_work.hpp
- // ~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 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_DETAIL_HANDLER_WORK_HPP
- #define BOOST_ASIO_DETAIL_HANDLER_WORK_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_executor.hpp>
- #include <boost/asio/detail/handler_invoke_helpers.hpp>
- #include <boost/asio/detail/push_options.hpp>
- namespace boost {
- namespace asio {
- namespace detail {
- // A helper class template to allow completion handlers to be dispatched
- // through either the new executors framework or the old invocaton hook. The
- // primary template uses the new executors framework.
- template <typename Handler,
- typename IoExecutor = system_executor, typename HandlerExecutor
- = typename associated_executor<Handler, IoExecutor>::type>
- class handler_work
- {
- public:
- explicit handler_work(Handler& handler) BOOST_ASIO_NOEXCEPT
- : io_executor_(),
- executor_(boost::asio::get_associated_executor(handler, io_executor_))
- {
- }
- handler_work(Handler& handler, const IoExecutor& io_ex) BOOST_ASIO_NOEXCEPT
- : io_executor_(io_ex),
- executor_(boost::asio::get_associated_executor(handler, io_executor_))
- {
- }
- static void start(Handler& handler) BOOST_ASIO_NOEXCEPT
- {
- HandlerExecutor ex(boost::asio::get_associated_executor(handler));
- ex.on_work_started();
- }
- static void start(Handler& handler,
- const IoExecutor& io_ex) BOOST_ASIO_NOEXCEPT
- {
- HandlerExecutor ex(boost::asio::get_associated_executor(handler, io_ex));
- ex.on_work_started();
- io_ex.on_work_started();
- }
- ~handler_work()
- {
- io_executor_.on_work_finished();
- executor_.on_work_finished();
- }
- template <typename Function>
- void complete(Function& function, Handler& handler)
- {
- executor_.dispatch(BOOST_ASIO_MOVE_CAST(Function)(function),
- boost::asio::get_associated_allocator(handler));
- }
- private:
- // Disallow copying and assignment.
- handler_work(const handler_work&);
- handler_work& operator=(const handler_work&);
- IoExecutor io_executor_;
- HandlerExecutor executor_;
- };
- // This specialisation dispatches a handler through the old invocation hook.
- // The specialisation is not strictly required for correctness, as the
- // system_executor will dispatch through the hook anyway. However, by doing
- // this we avoid an extra copy of the handler.
- template <typename Handler>
- class handler_work<Handler, system_executor, system_executor>
- {
- public:
- explicit handler_work(Handler&) BOOST_ASIO_NOEXCEPT {}
- static void start(Handler&) BOOST_ASIO_NOEXCEPT {}
- ~handler_work() {}
- template <typename Function>
- void complete(Function& function, Handler& handler)
- {
- boost_asio_handler_invoke_helpers::invoke(function, handler);
- }
- private:
- // Disallow copying and assignment.
- handler_work(const handler_work&);
- handler_work& operator=(const handler_work&);
- };
- } // namespace detail
- } // namespace asio
- } // namespace boost
- #include <boost/asio/detail/pop_options.hpp>
- #endif // BOOST_ASIO_DETAIL_HANDLER_WORK_HPP
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