329 lines
7.0 KiB
C++
329 lines
7.0 KiB
C++
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//
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// detail/composed_work.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 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 ASIO_DETAIL_COMPOSED_WORK_HPP
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#define ASIO_DETAIL_COMPOSED_WORK_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 "asio/detail/config.hpp"
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#include "asio/detail/type_traits.hpp"
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#include "asio/detail/variadic_templates.hpp"
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#include "asio/execution/executor.hpp"
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#include "asio/execution/outstanding_work.hpp"
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#include "asio/executor_work_guard.hpp"
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#include "asio/is_executor.hpp"
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#include "asio/system_executor.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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template <typename Executor, typename = void>
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class composed_work_guard
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{
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public:
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typedef typename decay<
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typename prefer_result<Executor,
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execution::outstanding_work_t::tracked_t
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>::type
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>::type executor_type;
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composed_work_guard(const Executor& ex)
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: executor_(asio::prefer(ex, execution::outstanding_work.tracked))
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{
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}
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void reset()
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{
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}
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executor_type get_executor() const ASIO_NOEXCEPT
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{
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return executor_;
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}
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private:
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executor_type executor_;
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};
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template <>
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struct composed_work_guard<system_executor>
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{
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public:
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typedef system_executor executor_type;
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composed_work_guard(const system_executor&)
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{
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}
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void reset()
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{
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}
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executor_type get_executor() const ASIO_NOEXCEPT
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{
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return system_executor();
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}
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};
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#if !defined(ASIO_NO_TS_EXECUTORS)
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template <typename Executor>
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struct composed_work_guard<Executor,
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typename enable_if<
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!execution::is_executor<Executor>::value
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>::type> : executor_work_guard<Executor>
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{
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composed_work_guard(const Executor& ex)
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: executor_work_guard<Executor>(ex)
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{
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}
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};
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#endif // !defined(ASIO_NO_TS_EXECUTORS)
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template <typename>
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struct composed_io_executors;
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template <>
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struct composed_io_executors<void()>
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{
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composed_io_executors() ASIO_NOEXCEPT
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: head_(system_executor())
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{
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}
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typedef system_executor head_type;
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system_executor head_;
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};
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inline composed_io_executors<void()> make_composed_io_executors()
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{
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return composed_io_executors<void()>();
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}
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template <typename Head>
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struct composed_io_executors<void(Head)>
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{
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explicit composed_io_executors(const Head& ex) ASIO_NOEXCEPT
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: head_(ex)
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{
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}
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typedef Head head_type;
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Head head_;
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};
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template <typename Head>
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inline composed_io_executors<void(Head)>
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make_composed_io_executors(const Head& head)
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{
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return composed_io_executors<void(Head)>(head);
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}
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Head, typename... Tail>
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struct composed_io_executors<void(Head, Tail...)>
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{
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explicit composed_io_executors(const Head& head,
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const Tail&... tail) ASIO_NOEXCEPT
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: head_(head),
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tail_(tail...)
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{
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}
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void reset()
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{
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head_.reset();
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tail_.reset();
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}
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typedef Head head_type;
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Head head_;
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composed_io_executors<void(Tail...)> tail_;
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};
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template <typename Head, typename... Tail>
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inline composed_io_executors<void(Head, Tail...)>
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make_composed_io_executors(const Head& head, const Tail&... tail)
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{
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return composed_io_executors<void(Head, Tail...)>(head, tail...);
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}
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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#define ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF(n) \
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template <typename Head, ASIO_VARIADIC_TPARAMS(n)> \
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struct composed_io_executors<void(Head, ASIO_VARIADIC_TARGS(n))> \
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{ \
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explicit composed_io_executors(const Head& head, \
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ASIO_VARIADIC_CONSTREF_PARAMS(n)) ASIO_NOEXCEPT \
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: head_(head), \
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tail_(ASIO_VARIADIC_BYVAL_ARGS(n)) \
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{ \
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} \
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\
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void reset() \
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{ \
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head_.reset(); \
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tail_.reset(); \
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} \
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\
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typedef Head head_type; \
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Head head_; \
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composed_io_executors<void(ASIO_VARIADIC_TARGS(n))> tail_; \
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}; \
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\
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template <typename Head, ASIO_VARIADIC_TPARAMS(n)> \
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inline composed_io_executors<void(Head, ASIO_VARIADIC_TARGS(n))> \
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make_composed_io_executors(const Head& head, \
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ASIO_VARIADIC_CONSTREF_PARAMS(n)) \
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{ \
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return composed_io_executors< \
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void(Head, ASIO_VARIADIC_TARGS(n))>( \
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head, ASIO_VARIADIC_BYVAL_ARGS(n)); \
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} \
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/**/
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ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF)
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#undef ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename>
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struct composed_work;
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template <>
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struct composed_work<void()>
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{
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typedef composed_io_executors<void()> executors_type;
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composed_work(const executors_type&) ASIO_NOEXCEPT
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: head_(system_executor())
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{
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}
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void reset()
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{
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head_.reset();
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}
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typedef system_executor head_type;
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composed_work_guard<system_executor> head_;
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};
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template <typename Head>
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struct composed_work<void(Head)>
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{
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typedef composed_io_executors<void(Head)> executors_type;
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explicit composed_work(const executors_type& ex) ASIO_NOEXCEPT
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: head_(ex.head_)
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{
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}
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void reset()
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{
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head_.reset();
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}
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typedef Head head_type;
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composed_work_guard<Head> head_;
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};
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Head, typename... Tail>
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struct composed_work<void(Head, Tail...)>
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{
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typedef composed_io_executors<void(Head, Tail...)> executors_type;
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explicit composed_work(const executors_type& ex) ASIO_NOEXCEPT
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: head_(ex.head_),
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tail_(ex.tail_)
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{
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}
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void reset()
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{
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head_.reset();
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tail_.reset();
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}
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typedef Head head_type;
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composed_work_guard<Head> head_;
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composed_work<void(Tail...)> tail_;
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};
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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#define ASIO_PRIVATE_COMPOSED_WORK_DEF(n) \
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template <typename Head, ASIO_VARIADIC_TPARAMS(n)> \
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struct composed_work<void(Head, ASIO_VARIADIC_TARGS(n))> \
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{ \
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typedef composed_io_executors<void(Head, \
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ASIO_VARIADIC_TARGS(n))> executors_type; \
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\
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explicit composed_work(const executors_type& ex) ASIO_NOEXCEPT \
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: head_(ex.head_), \
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tail_(ex.tail_) \
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{ \
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} \
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\
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void reset() \
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{ \
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head_.reset(); \
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tail_.reset(); \
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} \
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\
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typedef Head head_type; \
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composed_work_guard<Head> head_; \
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composed_work<void(ASIO_VARIADIC_TARGS(n))> tail_; \
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}; \
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/**/
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ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_COMPOSED_WORK_DEF)
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#undef ASIO_PRIVATE_COMPOSED_WORK_DEF
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename IoObject>
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inline typename IoObject::executor_type
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get_composed_io_executor(IoObject& io_object,
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typename enable_if<
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!is_executor<IoObject>::value
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>::type* = 0,
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typename enable_if<
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!execution::is_executor<IoObject>::value
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>::type* = 0)
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{
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return io_object.get_executor();
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}
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template <typename Executor>
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inline const Executor& get_composed_io_executor(const Executor& ex,
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typename enable_if<
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is_executor<Executor>::value
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|| execution::is_executor<Executor>::value
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>::type* = 0)
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{
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return ex;
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}
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_DETAIL_COMPOSED_WORK_HPP
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