mirror of
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535 lines
16 KiB
C++
535 lines
16 KiB
C++
//
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// impl/compose.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_IMPL_COMPOSE_HPP
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#define BOOST_ASIO_IMPL_COMPOSE_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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#include <boost/asio/detail/handler_alloc_helpers.hpp>
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#include <boost/asio/detail/handler_cont_helpers.hpp>
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#include <boost/asio/detail/handler_invoke_helpers.hpp>
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#include <boost/asio/detail/type_traits.hpp>
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#include <boost/asio/detail/variadic_templates.hpp>
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#include <boost/asio/executor_work_guard.hpp>
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#include <boost/asio/is_executor.hpp>
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#include <boost/asio/system_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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{
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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() BOOST_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) BOOST_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(BOOST_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) BOOST_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(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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#define BOOST_ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF(n) \
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template <typename Head, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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struct composed_io_executors<void(Head, BOOST_ASIO_VARIADIC_TARGS(n))> \
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{ \
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explicit composed_io_executors(const Head& head, \
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BOOST_ASIO_VARIADIC_CONSTREF_PARAMS(n)) BOOST_ASIO_NOEXCEPT \
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: head_(head), \
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tail_(BOOST_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(BOOST_ASIO_VARIADIC_TARGS(n))> tail_; \
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}; \
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\
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template <typename Head, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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inline composed_io_executors<void(Head, BOOST_ASIO_VARIADIC_TARGS(n))> \
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make_composed_io_executors(const Head& head, \
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BOOST_ASIO_VARIADIC_CONSTREF_PARAMS(n)) \
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{ \
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return composed_io_executors< \
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void(Head, BOOST_ASIO_VARIADIC_TARGS(n))>( \
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head, BOOST_ASIO_VARIADIC_BYVAL_ARGS(n)); \
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} \
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/**/
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BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF)
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#undef BOOST_ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF
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#endif // defined(BOOST_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&) BOOST_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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executor_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) BOOST_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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executor_work_guard<Head> head_;
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};
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#if defined(BOOST_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) BOOST_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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executor_work_guard<Head> head_;
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composed_work<void(Tail...)> tail_;
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};
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#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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#define BOOST_ASIO_PRIVATE_COMPOSED_WORK_DEF(n) \
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template <typename Head, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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struct composed_work<void(Head, BOOST_ASIO_VARIADIC_TARGS(n))> \
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{ \
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typedef composed_io_executors<void(Head, \
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BOOST_ASIO_VARIADIC_TARGS(n))> executors_type; \
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\
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explicit composed_work(const executors_type& ex) BOOST_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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executor_work_guard<Head> head_; \
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composed_work<void(BOOST_ASIO_VARIADIC_TARGS(n))> tail_; \
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}; \
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/**/
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BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_COMPOSED_WORK_DEF)
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#undef BOOST_ASIO_PRIVATE_COMPOSED_WORK_DEF
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#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Impl, typename Work, typename Handler, typename Signature>
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class composed_op;
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template <typename Impl, typename Work, typename Handler,
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typename R, typename... Args>
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class composed_op<Impl, Work, Handler, R(Args...)>
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#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename Impl, typename Work, typename Handler, typename Signature>
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class composed_op
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#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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{
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public:
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composed_op(BOOST_ASIO_MOVE_ARG(Impl) impl,
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BOOST_ASIO_MOVE_ARG(Work) work,
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BOOST_ASIO_MOVE_ARG(Handler) handler)
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: impl_(BOOST_ASIO_MOVE_CAST(Impl)(impl)),
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work_(BOOST_ASIO_MOVE_CAST(Work)(work)),
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handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
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invocations_(0)
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{
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}
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#if defined(BOOST_ASIO_HAS_MOVE)
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composed_op(composed_op&& other)
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: impl_(BOOST_ASIO_MOVE_CAST(Impl)(other.impl_)),
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work_(BOOST_ASIO_MOVE_CAST(Work)(other.work_)),
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handler_(BOOST_ASIO_MOVE_CAST(Handler)(other.handler_)),
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invocations_(other.invocations_)
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{
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}
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#endif // defined(BOOST_ASIO_HAS_MOVE)
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typedef typename associated_executor<Handler,
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typename Work::head_type>::type executor_type;
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executor_type get_executor() const BOOST_ASIO_NOEXCEPT
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{
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return (get_associated_executor)(handler_, work_.head_.get_executor());
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}
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typedef typename associated_allocator<Handler,
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std::allocator<void> >::type allocator_type;
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allocator_type get_allocator() const BOOST_ASIO_NOEXCEPT
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{
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return (get_associated_allocator)(handler_, std::allocator<void>());
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}
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#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template<typename... T>
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void operator()(BOOST_ASIO_MOVE_ARG(T)... t)
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{
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if (invocations_ < ~unsigned(0))
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++invocations_;
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impl_(*this, BOOST_ASIO_MOVE_CAST(T)(t)...);
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}
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void complete(Args... args)
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{
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this->work_.reset();
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this->handler_(BOOST_ASIO_MOVE_CAST(Args)(args)...);
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}
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#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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void operator()()
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{
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if (invocations_ < ~unsigned(0))
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++invocations_;
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impl_(*this);
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}
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void complete()
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{
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this->work_.reset();
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this->handler_();
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}
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#define BOOST_ASIO_PRIVATE_COMPOSED_OP_DEF(n) \
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template<BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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void operator()(BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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if (invocations_ < ~unsigned(0)) \
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++invocations_; \
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impl_(*this, BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
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} \
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\
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template<BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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void complete(BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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this->work_.reset(); \
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this->handler_(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
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} \
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/**/
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BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_COMPOSED_OP_DEF)
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#undef BOOST_ASIO_PRIVATE_COMPOSED_OP_DEF
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#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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//private:
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Impl impl_;
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Work work_;
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Handler handler_;
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unsigned invocations_;
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};
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template <typename Impl, typename Work, typename Handler, typename Signature>
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inline void* asio_handler_allocate(std::size_t size,
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composed_op<Impl, Work, Handler, Signature>* this_handler)
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{
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return boost_asio_handler_alloc_helpers::allocate(
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size, this_handler->handler_);
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}
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template <typename Impl, typename Work, typename Handler, typename Signature>
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inline void asio_handler_deallocate(void* pointer, std::size_t size,
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composed_op<Impl, Work, Handler, Signature>* this_handler)
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{
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boost_asio_handler_alloc_helpers::deallocate(
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pointer, size, this_handler->handler_);
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}
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template <typename Impl, typename Work, typename Handler, typename Signature>
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inline bool asio_handler_is_continuation(
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composed_op<Impl, Work, Handler, Signature>* this_handler)
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{
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return this_handler->invocations_ > 1 ? true
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: boost_asio_handler_cont_helpers::is_continuation(
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this_handler->handler_);
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}
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template <typename Function, typename Impl,
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typename Work, typename Handler, typename Signature>
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inline void asio_handler_invoke(Function& function,
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composed_op<Impl, Work, Handler, Signature>* this_handler)
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{
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boost_asio_handler_invoke_helpers::invoke(
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function, this_handler->handler_);
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}
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template <typename Function, typename Impl,
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typename Work, typename Handler, typename Signature>
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inline void asio_handler_invoke(const Function& function,
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composed_op<Impl, Work, Handler, Signature>* this_handler)
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{
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boost_asio_handler_invoke_helpers::invoke(
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function, this_handler->handler_);
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}
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template <typename Signature, typename Executors>
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class initiate_composed_op
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{
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public:
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typedef typename composed_io_executors<Executors>::head_type executor_type;
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template <typename T>
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explicit initiate_composed_op(BOOST_ASIO_MOVE_ARG(T) executors)
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: executors_(BOOST_ASIO_MOVE_CAST(T)(executors))
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{
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}
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executor_type get_executor() const BOOST_ASIO_NOEXCEPT
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{
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return executors_.head_;
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}
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template <typename Handler, typename Impl>
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void operator()(BOOST_ASIO_MOVE_ARG(Handler) handler,
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BOOST_ASIO_MOVE_ARG(Impl) impl) const
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{
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composed_op<typename decay<Impl>::type, composed_work<Executors>,
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typename decay<Handler>::type, Signature>(
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BOOST_ASIO_MOVE_CAST(Impl)(impl),
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composed_work<Executors>(executors_),
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BOOST_ASIO_MOVE_CAST(Handler)(handler))();
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}
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private:
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composed_io_executors<Executors> executors_;
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};
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template <typename Signature, typename Executors>
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inline initiate_composed_op<Signature, Executors> make_initiate_composed_op(
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BOOST_ASIO_MOVE_ARG(composed_io_executors<Executors>) executors)
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{
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return initiate_composed_op<Signature, Executors>(
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BOOST_ASIO_MOVE_CAST(composed_io_executors<Executors>)(executors));
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}
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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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{
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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<is_executor<Executor>::value>::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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#if !defined(GENERATING_DOCUMENTATION)
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#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename CompletionToken, typename Signature,
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typename Implementation, typename... IoObjectsOrExecutors>
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BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, Signature)
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async_compose(BOOST_ASIO_MOVE_ARG(Implementation) implementation,
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BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token,
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BOOST_ASIO_MOVE_ARG(IoObjectsOrExecutors)... io_objects_or_executors)
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{
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return async_initiate<CompletionToken, Signature>(
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detail::make_initiate_composed_op<Signature>(
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detail::make_composed_io_executors(
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detail::get_composed_io_executor(
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BOOST_ASIO_MOVE_CAST(IoObjectsOrExecutors)(
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io_objects_or_executors))...)),
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token, BOOST_ASIO_MOVE_CAST(Implementation)(implementation));
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}
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#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename CompletionToken, typename Signature, typename Implementation>
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BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, Signature)
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async_compose(BOOST_ASIO_MOVE_ARG(Implementation) implementation,
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BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token)
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{
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return async_initiate<CompletionToken, Signature>(
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detail::make_initiate_composed_op<Signature>(
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detail::make_composed_io_executors()),
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token, BOOST_ASIO_MOVE_CAST(Implementation)(implementation));
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}
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# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n) \
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BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_##n
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# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_1 \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1))
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# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_2 \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T2)(x2))
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# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_3 \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T3)(x3))
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# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_4 \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T3)(x3)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T4)(x4))
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# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_5 \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T3)(x3)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T4)(x4)), \
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detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T5)(x5))
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#define BOOST_ASIO_PRIVATE_ASYNC_COMPOSE_DEF(n) \
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template <typename CompletionToken, typename Signature, \
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typename Implementation, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
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BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, Signature) \
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async_compose(BOOST_ASIO_MOVE_ARG(Implementation) implementation, \
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BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token, \
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BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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return async_initiate<CompletionToken, Signature>( \
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detail::make_initiate_composed_op<Signature>( \
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detail::make_composed_io_executors( \
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BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n))), \
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token, BOOST_ASIO_MOVE_CAST(Implementation)(implementation)); \
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} \
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/**/
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BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_ASYNC_COMPOSE_DEF)
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#undef BOOST_ASIO_PRIVATE_ASYNC_COMPOSE_DEF
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#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR
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#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_1
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#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_2
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#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_3
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#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_4
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#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_5
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#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
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#endif // !defined(GENERATING_DOCUMENTATION)
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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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#endif // BOOST_ASIO_IMPL_COMPOSE_HPP
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