mirror of
https://github.com/30hours/blah2.git
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531 lines
18 KiB
C++
531 lines
18 KiB
C++
//
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// compose.hpp
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// ~~~~~~~~~~~
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//
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// Copyright (c) 2003-2022 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_COMPOSE_HPP
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#define ASIO_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 "asio/detail/config.hpp"
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#include "asio/associated_executor.hpp"
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#include "asio/async_result.hpp"
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#include "asio/detail/base_from_cancellation_state.hpp"
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#include "asio/detail/composed_work.hpp"
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#include "asio/detail/handler_alloc_helpers.hpp"
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#include "asio/detail/handler_cont_helpers.hpp"
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#include "asio/detail/handler_invoke_helpers.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/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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#if defined(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(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(ASIO_HAS_VARIADIC_TEMPLATES)
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: public base_from_cancellation_state<Handler>
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{
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public:
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template <typename I, typename W, typename H>
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composed_op(ASIO_MOVE_ARG(I) impl,
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ASIO_MOVE_ARG(W) work,
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ASIO_MOVE_ARG(H) handler)
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: base_from_cancellation_state<Handler>(
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handler, enable_terminal_cancellation()),
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impl_(ASIO_MOVE_CAST(I)(impl)),
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work_(ASIO_MOVE_CAST(W)(work)),
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handler_(ASIO_MOVE_CAST(H)(handler)),
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invocations_(0)
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{
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}
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#if defined(ASIO_HAS_MOVE)
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composed_op(composed_op&& other)
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: base_from_cancellation_state<Handler>(
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ASIO_MOVE_CAST(base_from_cancellation_state<
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Handler>)(other)),
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impl_(ASIO_MOVE_CAST(Impl)(other.impl_)),
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work_(ASIO_MOVE_CAST(Work)(other.work_)),
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handler_(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(ASIO_HAS_MOVE)
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typedef typename composed_work_guard<
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typename Work::head_type>::executor_type io_executor_type;
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io_executor_type get_io_executor() const ASIO_NOEXCEPT
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{
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return work_.head_.get_executor();
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}
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typedef typename associated_executor<Handler, io_executor_type>::type
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executor_type;
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executor_type get_executor() const 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 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(ASIO_HAS_VARIADIC_TEMPLATES)
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template<typename... T>
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void operator()(ASIO_MOVE_ARG(T)... t)
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{
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if (invocations_ < ~0u)
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++invocations_;
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this->get_cancellation_state().slot().clear();
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impl_(*this, 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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ASIO_MOVE_OR_LVALUE(Handler)(this->handler_)(
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ASIO_MOVE_CAST(Args)(args)...);
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}
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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void operator()()
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{
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if (invocations_ < ~0u)
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++invocations_;
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this->get_cancellation_state().slot().clear();
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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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ASIO_MOVE_OR_LVALUE(Handler)(this->handler_)();
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}
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#define ASIO_PRIVATE_COMPOSED_OP_DEF(n) \
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template<ASIO_VARIADIC_TPARAMS(n)> \
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void operator()(ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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if (invocations_ < ~0u) \
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++invocations_; \
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this->get_cancellation_state().slot().clear(); \
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impl_(*this, ASIO_VARIADIC_MOVE_ARGS(n)); \
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} \
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\
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template<ASIO_VARIADIC_TPARAMS(n)> \
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void complete(ASIO_VARIADIC_MOVE_PARAMS(n)) \
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{ \
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this->work_.reset(); \
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ASIO_MOVE_OR_LVALUE(Handler)(this->handler_)( \
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ASIO_VARIADIC_MOVE_ARGS(n)); \
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} \
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/**/
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ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_COMPOSED_OP_DEF)
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#undef ASIO_PRIVATE_COMPOSED_OP_DEF
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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void reset_cancellation_state()
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{
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base_from_cancellation_state<Handler>::reset_cancellation_state(handler_);
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}
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template <typename Filter>
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void reset_cancellation_state(ASIO_MOVE_ARG(Filter) filter)
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{
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base_from_cancellation_state<Handler>::reset_cancellation_state(handler_,
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ASIO_MOVE_CAST(Filter)(filter));
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}
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template <typename InFilter, typename OutFilter>
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void reset_cancellation_state(ASIO_MOVE_ARG(InFilter) in_filter,
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ASIO_MOVE_ARG(OutFilter) out_filter)
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{
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base_from_cancellation_state<Handler>::reset_cancellation_state(handler_,
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ASIO_MOVE_CAST(InFilter)(in_filter),
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ASIO_MOVE_CAST(OutFilter)(out_filter));
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}
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cancellation_type_t cancelled() const ASIO_NOEXCEPT
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{
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return base_from_cancellation_state<Handler>::cancelled();
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}
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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 asio_handler_allocate_is_deprecated
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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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#if defined(ASIO_NO_DEPRECATED)
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asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
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return asio_handler_allocate_is_no_longer_used();
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#else // defined(ASIO_NO_DEPRECATED)
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return asio_handler_alloc_helpers::allocate(
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size, this_handler->handler_);
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#endif // defined(ASIO_NO_DEPRECATED)
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}
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template <typename Impl, typename Work, typename Handler, typename Signature>
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inline asio_handler_deallocate_is_deprecated
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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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asio_handler_alloc_helpers::deallocate(
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pointer, size, this_handler->handler_);
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#if defined(ASIO_NO_DEPRECATED)
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return asio_handler_deallocate_is_no_longer_used();
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#endif // defined(ASIO_NO_DEPRECATED)
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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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: 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 asio_handler_invoke_is_deprecated
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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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asio_handler_invoke_helpers::invoke(
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function, this_handler->handler_);
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#if defined(ASIO_NO_DEPRECATED)
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return asio_handler_invoke_is_no_longer_used();
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#endif // defined(ASIO_NO_DEPRECATED)
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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 asio_handler_invoke_is_deprecated
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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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asio_handler_invoke_helpers::invoke(
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function, this_handler->handler_);
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#if defined(ASIO_NO_DEPRECATED)
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return asio_handler_invoke_is_no_longer_used();
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#endif // defined(ASIO_NO_DEPRECATED)
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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(int, ASIO_MOVE_ARG(T) executors)
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: executors_(ASIO_MOVE_CAST(T)(executors))
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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 executors_.head_;
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}
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template <typename Handler, typename Impl>
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void operator()(ASIO_MOVE_ARG(Handler) handler,
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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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ASIO_MOVE_CAST(Impl)(impl),
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composed_work<Executors>(executors_),
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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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ASIO_MOVE_ARG(composed_io_executors<Executors>) executors)
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{
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return initiate_composed_op<Signature, Executors>(0,
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ASIO_MOVE_CAST(composed_io_executors<Executors>)(executors));
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}
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} // namespace detail
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#if !defined(GENERATING_DOCUMENTATION)
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template <template <typename, typename> class Associator,
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typename Impl, typename Work, typename Handler,
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typename Signature, typename DefaultCandidate>
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struct associator<Associator,
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detail::composed_op<Impl, Work, Handler, Signature>,
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DefaultCandidate>
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: Associator<Handler, DefaultCandidate>
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{
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static typename Associator<Handler, DefaultCandidate>::type
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get(const detail::composed_op<Impl, Work, Handler, Signature>& h)
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ASIO_NOEXCEPT
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{
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return Associator<Handler, DefaultCandidate>::get(h.handler_);
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}
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static ASIO_AUTO_RETURN_TYPE_PREFIX2(
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typename Associator<Handler, DefaultCandidate>::type)
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get(const detail::composed_op<Impl, Work, Handler, Signature>& h,
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const DefaultCandidate& c) ASIO_NOEXCEPT
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ASIO_AUTO_RETURN_TYPE_SUFFIX((
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Associator<Handler, DefaultCandidate>::get(h.handler_, c)))
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{
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return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
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}
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};
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#endif // !defined(GENERATING_DOCUMENTATION)
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES) \
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|| defined(GENERATING_DOCUMENTATION)
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/// Launch an asynchronous operation with a stateful implementation.
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/**
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* The async_compose function simplifies the implementation of composed
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* asynchronous operations automatically wrapping a stateful function object
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* with a conforming intermediate completion handler.
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*
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* @param implementation A function object that contains the implementation of
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* the composed asynchronous operation. The first argument to the function
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* object is a non-const reference to the enclosing intermediate completion
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* handler. The remaining arguments are any arguments that originate from the
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* completion handlers of any asynchronous operations performed by the
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* implementation.
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*
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* @param token The completion token.
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*
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* @param io_objects_or_executors Zero or more I/O objects or I/O executors for
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* which outstanding work must be maintained.
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*
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* @par Example:
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*
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* @code struct async_echo_implementation
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* {
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* tcp::socket& socket_;
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* asio::mutable_buffer buffer_;
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* enum { starting, reading, writing } state_;
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*
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* template <typename Self>
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* void operator()(Self& self,
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* asio::error_code error = {},
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* std::size_t n = 0)
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* {
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* switch (state_)
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* {
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* case starting:
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* state_ = reading;
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* socket_.async_read_some(
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* buffer_, std::move(self));
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* break;
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* case reading:
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* if (error)
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* {
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* self.complete(error, 0);
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* }
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* else
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* {
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* state_ = writing;
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* asio::async_write(socket_, buffer_,
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* asio::transfer_exactly(n),
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* std::move(self));
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* }
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* break;
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* case writing:
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* self.complete(error, n);
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* break;
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* }
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* }
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* };
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*
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* template <typename CompletionToken>
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* auto async_echo(tcp::socket& socket,
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* asio::mutable_buffer buffer,
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* CompletionToken&& token) ->
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* decltype(
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* asio::async_compose<CompletionToken,
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* void(asio::error_code, std::size_t)>(
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* std::declval<async_echo_implementation>(),
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* token, socket))
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* {
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* return asio::async_compose<CompletionToken,
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* void(asio::error_code, std::size_t)>(
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* async_echo_implementation{socket, buffer,
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* async_echo_implementation::starting},
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* token, socket);
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* } @endcode
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*/
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template <typename CompletionToken, typename Signature,
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typename Implementation, typename... IoObjectsOrExecutors>
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ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(CompletionToken, Signature)
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async_compose(ASIO_MOVE_ARG(Implementation) implementation,
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ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token,
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ASIO_MOVE_ARG(IoObjectsOrExecutors)... io_objects_or_executors)
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ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
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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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ASIO_MOVE_CAST(IoObjectsOrExecutors)(
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io_objects_or_executors))...)),
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token, ASIO_MOVE_CAST(Implementation)(implementation))))
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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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ASIO_MOVE_CAST(IoObjectsOrExecutors)(
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io_objects_or_executors))...)),
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token, ASIO_MOVE_CAST(Implementation)(implementation));
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}
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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// || defined(GENERATING_DOCUMENTATION)
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template <typename CompletionToken, typename Signature, typename Implementation>
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ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(CompletionToken, Signature)
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async_compose(ASIO_MOVE_ARG(Implementation) implementation,
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ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token)
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ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
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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, ASIO_MOVE_CAST(Implementation)(implementation))))
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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, ASIO_MOVE_CAST(Implementation)(implementation));
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}
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n) \
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ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_##n
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_1 \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1))
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_2 \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2))
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_3 \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3))
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_4 \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4))
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_5 \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T5)(x5))
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_6 \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T5)(x5)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T6)(x6))
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_7 \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T5)(x5)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T6)(x6)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T7)(x7))
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# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_8 \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T5)(x5)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T6)(x6)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T7)(x7)), \
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detail::get_composed_io_executor(ASIO_MOVE_CAST(T8)(x8))
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#define ASIO_PRIVATE_ASYNC_COMPOSE_DEF(n) \
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template <typename CompletionToken, typename Signature, \
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typename Implementation, ASIO_VARIADIC_TPARAMS(n)> \
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ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(CompletionToken, Signature) \
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async_compose(ASIO_MOVE_ARG(Implementation) implementation, \
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ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token, \
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ASIO_VARIADIC_MOVE_PARAMS(n)) \
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ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX(( \
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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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ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n))), \
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token, ASIO_MOVE_CAST(Implementation)(implementation)))) \
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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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ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n))), \
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token, ASIO_MOVE_CAST(Implementation)(implementation)); \
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} \
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/**/
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|
ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_ASYNC_COMPOSE_DEF)
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|
#undef ASIO_PRIVATE_ASYNC_COMPOSE_DEF
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|
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|
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR
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#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_1
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#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_2
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|
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_3
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|
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_4
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|
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_5
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|
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_6
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|
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_7
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|
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_8
|
|
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|
#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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// || defined(GENERATING_DOCUMENTATION)
|
|
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|
} // namespace asio
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|
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#include "asio/detail/pop_options.hpp"
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|
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#endif // ASIO_COMPOSE_HPP
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