mirror of
https://github.com/30hours/blah2.git
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684 lines
18 KiB
C++
684 lines
18 KiB
C++
//
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// any_completion_handler.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_ANY_COMPLETION_HANDLER_HPP
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#define ASIO_ANY_COMPLETION_HANDLER_HPP
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#include "asio/detail/config.hpp"
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#if (defined(ASIO_HAS_STD_TUPLE) \
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&& defined(ASIO_HAS_MOVE) \
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&& defined(ASIO_HAS_VARIADIC_TEMPLATES)) \
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|| defined(GENERATING_DOCUMENTATION)
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#include <cstring>
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#include <functional>
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#include <memory>
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#include <utility>
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#include "asio/any_completion_executor.hpp"
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#include "asio/associated_allocator.hpp"
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#include "asio/associated_cancellation_slot.hpp"
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#include "asio/associated_executor.hpp"
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#include "asio/cancellation_state.hpp"
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#include "asio/recycling_allocator.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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class any_completion_handler_impl_base
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{
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public:
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template <typename S>
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explicit any_completion_handler_impl_base(S&& slot)
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: cancel_state_(ASIO_MOVE_CAST(S)(slot), enable_total_cancellation())
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{
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}
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cancellation_slot get_cancellation_slot() const ASIO_NOEXCEPT
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{
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return cancel_state_.slot();
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}
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private:
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cancellation_state cancel_state_;
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};
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template <typename Handler>
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class any_completion_handler_impl :
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public any_completion_handler_impl_base
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{
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public:
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template <typename S, typename H>
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any_completion_handler_impl(S&& slot, H&& h)
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: any_completion_handler_impl_base(ASIO_MOVE_CAST(S)(slot)),
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handler_(ASIO_MOVE_CAST(H)(h))
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{
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}
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struct uninit_deleter
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{
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typename std::allocator_traits<
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associated_allocator_t<Handler,
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asio::recycling_allocator<void>>>::template
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rebind_alloc<any_completion_handler_impl> alloc;
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void operator()(any_completion_handler_impl* ptr)
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{
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std::allocator_traits<decltype(alloc)>::deallocate(alloc, ptr, 1);
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}
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};
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struct deleter
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{
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typename std::allocator_traits<
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associated_allocator_t<Handler,
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asio::recycling_allocator<void>>>::template
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rebind_alloc<any_completion_handler_impl> alloc;
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void operator()(any_completion_handler_impl* ptr)
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{
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std::allocator_traits<decltype(alloc)>::destroy(alloc, ptr);
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std::allocator_traits<decltype(alloc)>::deallocate(alloc, ptr, 1);
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}
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};
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template <typename S, typename H>
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static any_completion_handler_impl* create(S&& slot, H&& h)
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{
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uninit_deleter d{
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(get_associated_allocator)(h,
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asio::recycling_allocator<void>())};
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std::unique_ptr<any_completion_handler_impl, uninit_deleter> uninit_ptr(
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std::allocator_traits<decltype(d.alloc)>::allocate(d.alloc, 1), d);
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any_completion_handler_impl* ptr =
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new (uninit_ptr.get()) any_completion_handler_impl(
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ASIO_MOVE_CAST(S)(slot), ASIO_MOVE_CAST(H)(h));
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uninit_ptr.release();
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return ptr;
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}
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void destroy()
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{
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deleter d{
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(get_associated_allocator)(handler_,
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asio::recycling_allocator<void>())};
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d(this);
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}
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any_completion_executor executor(
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const any_completion_executor& candidate) const ASIO_NOEXCEPT
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{
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return any_completion_executor(std::nothrow,
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(get_associated_executor)(handler_, candidate));
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}
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void* allocate(std::size_t size, std::size_t align) const
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{
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typename std::allocator_traits<
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associated_allocator_t<Handler,
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asio::recycling_allocator<void>>>::template
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rebind_alloc<unsigned char> alloc(
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(get_associated_allocator)(handler_,
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asio::recycling_allocator<void>()));
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std::size_t space = size + align - 1;
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unsigned char* base =
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std::allocator_traits<decltype(alloc)>::allocate(
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alloc, space + sizeof(std::ptrdiff_t));
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void* p = base;
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if (detail::align(align, size, p, space))
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{
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std::ptrdiff_t off = static_cast<unsigned char*>(p) - base;
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std::memcpy(static_cast<unsigned char*>(p) + size, &off, sizeof(off));
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return p;
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}
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std::bad_alloc ex;
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asio::detail::throw_exception(ex);
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return nullptr;
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}
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void deallocate(void* p, std::size_t size, std::size_t align) const
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{
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if (p)
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{
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typename std::allocator_traits<
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associated_allocator_t<Handler,
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asio::recycling_allocator<void>>>::template
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rebind_alloc<unsigned char> alloc(
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(get_associated_allocator)(handler_,
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asio::recycling_allocator<void>()));
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std::ptrdiff_t off;
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std::memcpy(&off, static_cast<unsigned char*>(p) + size, sizeof(off));
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unsigned char* base = static_cast<unsigned char*>(p) - off;
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std::allocator_traits<decltype(alloc)>::deallocate(
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alloc, base, size + align -1 + sizeof(std::ptrdiff_t));
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}
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}
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template <typename... Args>
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void call(Args&&... args)
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{
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deleter d{
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(get_associated_allocator)(handler_,
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asio::recycling_allocator<void>())};
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std::unique_ptr<any_completion_handler_impl, deleter> ptr(this, d);
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Handler handler(ASIO_MOVE_CAST(Handler)(handler_));
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ptr.reset();
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ASIO_MOVE_CAST(Handler)(handler)(
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ASIO_MOVE_CAST(Args)(args)...);
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}
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private:
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Handler handler_;
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};
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template <typename Signature>
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class any_completion_handler_call_fn;
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template <typename R, typename... Args>
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class any_completion_handler_call_fn<R(Args...)>
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{
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public:
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using type = void(*)(any_completion_handler_impl_base*, Args...);
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constexpr any_completion_handler_call_fn(type fn)
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: call_fn_(fn)
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{
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}
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void call(any_completion_handler_impl_base* impl, Args... args) const
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{
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call_fn_(impl, ASIO_MOVE_CAST(Args)(args)...);
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}
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template <typename Handler>
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static void impl(any_completion_handler_impl_base* impl, Args... args)
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{
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static_cast<any_completion_handler_impl<Handler>*>(impl)->call(
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ASIO_MOVE_CAST(Args)(args)...);
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}
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private:
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type call_fn_;
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};
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template <typename... Signatures>
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class any_completion_handler_call_fns;
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template <typename Signature>
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class any_completion_handler_call_fns<Signature> :
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public any_completion_handler_call_fn<Signature>
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{
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public:
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using any_completion_handler_call_fn<
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Signature>::any_completion_handler_call_fn;
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using any_completion_handler_call_fn<Signature>::call;
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};
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template <typename Signature, typename... Signatures>
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class any_completion_handler_call_fns<Signature, Signatures...> :
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public any_completion_handler_call_fn<Signature>,
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public any_completion_handler_call_fns<Signatures...>
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{
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public:
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template <typename CallFn, typename... CallFns>
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constexpr any_completion_handler_call_fns(CallFn fn, CallFns... fns)
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: any_completion_handler_call_fn<Signature>(fn),
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any_completion_handler_call_fns<Signatures...>(fns...)
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{
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}
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using any_completion_handler_call_fn<Signature>::call;
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using any_completion_handler_call_fns<Signatures...>::call;
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};
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class any_completion_handler_destroy_fn
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{
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public:
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using type = void(*)(any_completion_handler_impl_base*);
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constexpr any_completion_handler_destroy_fn(type fn)
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: destroy_fn_(fn)
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{
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}
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void destroy(any_completion_handler_impl_base* impl) const
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{
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destroy_fn_(impl);
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}
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template <typename Handler>
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static void impl(any_completion_handler_impl_base* impl)
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{
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static_cast<any_completion_handler_impl<Handler>*>(impl)->destroy();
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}
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private:
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type destroy_fn_;
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};
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class any_completion_handler_executor_fn
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{
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public:
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using type = any_completion_executor(*)(
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any_completion_handler_impl_base*, const any_completion_executor&);
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constexpr any_completion_handler_executor_fn(type fn)
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: executor_fn_(fn)
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{
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}
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any_completion_executor executor(any_completion_handler_impl_base* impl,
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const any_completion_executor& candidate) const
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{
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return executor_fn_(impl, candidate);
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}
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template <typename Handler>
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static any_completion_executor impl(any_completion_handler_impl_base* impl,
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const any_completion_executor& candidate)
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{
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return static_cast<any_completion_handler_impl<Handler>*>(impl)->executor(
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candidate);
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}
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private:
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type executor_fn_;
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};
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class any_completion_handler_allocate_fn
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{
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public:
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using type = void*(*)(any_completion_handler_impl_base*,
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std::size_t, std::size_t);
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constexpr any_completion_handler_allocate_fn(type fn)
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: allocate_fn_(fn)
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{
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}
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void* allocate(any_completion_handler_impl_base* impl,
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std::size_t size, std::size_t align) const
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{
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return allocate_fn_(impl, size, align);
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}
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template <typename Handler>
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static void* impl(any_completion_handler_impl_base* impl,
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std::size_t size, std::size_t align)
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{
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return static_cast<any_completion_handler_impl<Handler>*>(impl)->allocate(
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size, align);
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}
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private:
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type allocate_fn_;
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};
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class any_completion_handler_deallocate_fn
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{
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public:
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using type = void(*)(any_completion_handler_impl_base*,
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void*, std::size_t, std::size_t);
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constexpr any_completion_handler_deallocate_fn(type fn)
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: deallocate_fn_(fn)
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{
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}
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void deallocate(any_completion_handler_impl_base* impl,
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void* p, std::size_t size, std::size_t align) const
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{
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deallocate_fn_(impl, p, size, align);
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}
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template <typename Handler>
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static void impl(any_completion_handler_impl_base* impl,
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void* p, std::size_t size, std::size_t align)
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{
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static_cast<any_completion_handler_impl<Handler>*>(impl)->deallocate(
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p, size, align);
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}
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private:
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type deallocate_fn_;
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};
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template <typename... Signatures>
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class any_completion_handler_fn_table
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: private any_completion_handler_destroy_fn,
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private any_completion_handler_executor_fn,
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private any_completion_handler_allocate_fn,
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private any_completion_handler_deallocate_fn,
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private any_completion_handler_call_fns<Signatures...>
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{
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public:
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template <typename... CallFns>
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constexpr any_completion_handler_fn_table(
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any_completion_handler_destroy_fn::type destroy_fn,
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any_completion_handler_executor_fn::type executor_fn,
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any_completion_handler_allocate_fn::type allocate_fn,
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any_completion_handler_deallocate_fn::type deallocate_fn,
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CallFns... call_fns)
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: any_completion_handler_destroy_fn(destroy_fn),
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any_completion_handler_executor_fn(executor_fn),
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any_completion_handler_allocate_fn(allocate_fn),
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any_completion_handler_deallocate_fn(deallocate_fn),
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any_completion_handler_call_fns<Signatures...>(call_fns...)
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{
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}
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using any_completion_handler_destroy_fn::destroy;
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using any_completion_handler_executor_fn::executor;
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using any_completion_handler_allocate_fn::allocate;
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using any_completion_handler_deallocate_fn::deallocate;
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using any_completion_handler_call_fns<Signatures...>::call;
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};
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template <typename Handler, typename... Signatures>
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struct any_completion_handler_fn_table_instance
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{
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static constexpr any_completion_handler_fn_table<Signatures...>
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value = any_completion_handler_fn_table<Signatures...>(
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&any_completion_handler_destroy_fn::impl<Handler>,
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&any_completion_handler_executor_fn::impl<Handler>,
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&any_completion_handler_allocate_fn::impl<Handler>,
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&any_completion_handler_deallocate_fn::impl<Handler>,
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&any_completion_handler_call_fn<Signatures>::template impl<Handler>...);
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};
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template <typename Handler, typename... Signatures>
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constexpr any_completion_handler_fn_table<Signatures...>
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any_completion_handler_fn_table_instance<Handler, Signatures...>::value;
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} // namespace detail
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template <typename... Signatures>
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class any_completion_handler;
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template <typename T, typename... Signatures>
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class any_completion_handler_allocator
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{
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private:
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template <typename...>
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friend class any_completion_handler;
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template <typename, typename...>
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friend class any_completion_handler_allocator;
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const detail::any_completion_handler_fn_table<Signatures...>* fn_table_;
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detail::any_completion_handler_impl_base* impl_;
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constexpr any_completion_handler_allocator(int,
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const any_completion_handler<Signatures...>& h) ASIO_NOEXCEPT
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: fn_table_(h.fn_table_),
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impl_(h.impl_)
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{
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}
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public:
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typedef T value_type;
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template <typename U>
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struct rebind
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{
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typedef any_completion_handler_allocator<U, Signatures...> other;
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};
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template <typename U>
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constexpr any_completion_handler_allocator(
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const any_completion_handler_allocator<U, Signatures...>& a)
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ASIO_NOEXCEPT
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: fn_table_(a.fn_table_),
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impl_(a.impl_)
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{
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}
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constexpr bool operator==(
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const any_completion_handler_allocator& other) const ASIO_NOEXCEPT
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{
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return fn_table_ == other.fn_table_ && impl_ == other.impl_;
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}
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constexpr bool operator!=(
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const any_completion_handler_allocator& other) const ASIO_NOEXCEPT
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{
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return fn_table_ != other.fn_table_ || impl_ != other.impl_;
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}
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T* allocate(std::size_t n) const
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{
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return static_cast<T*>(
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fn_table_->allocate(
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impl_, sizeof(T) * n, alignof(T)));
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}
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void deallocate(T* p, std::size_t n) const
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{
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fn_table_->deallocate(impl_, p, sizeof(T) * n, alignof(T));
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}
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};
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template <typename... Signatures>
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class any_completion_handler_allocator<void, Signatures...>
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{
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private:
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template <typename...>
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friend class any_completion_handler;
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template <typename, typename...>
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friend class any_completion_handler_allocator;
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const detail::any_completion_handler_fn_table<Signatures...>* fn_table_;
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detail::any_completion_handler_impl_base* impl_;
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constexpr any_completion_handler_allocator(int,
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const any_completion_handler<Signatures...>& h) ASIO_NOEXCEPT
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: fn_table_(h.fn_table_),
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impl_(h.impl_)
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{
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}
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public:
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typedef void value_type;
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template <typename U>
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struct rebind
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{
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typedef any_completion_handler_allocator<U, Signatures...> other;
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};
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template <typename U>
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constexpr any_completion_handler_allocator(
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const any_completion_handler_allocator<U, Signatures...>& a)
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ASIO_NOEXCEPT
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: fn_table_(a.fn_table_),
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impl_(a.impl_)
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{
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}
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constexpr bool operator==(
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const any_completion_handler_allocator& other) const ASIO_NOEXCEPT
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{
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return fn_table_ == other.fn_table_ && impl_ == other.impl_;
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}
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constexpr bool operator!=(
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const any_completion_handler_allocator& other) const ASIO_NOEXCEPT
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{
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return fn_table_ != other.fn_table_ || impl_ != other.impl_;
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}
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};
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template <typename... Signatures>
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class any_completion_handler
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{
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private:
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template <typename, typename...>
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friend class any_completion_handler_allocator;
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template <typename, typename>
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friend struct associated_executor;
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const detail::any_completion_handler_fn_table<Signatures...>* fn_table_;
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detail::any_completion_handler_impl_base* impl_;
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public:
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using allocator_type = any_completion_handler_allocator<void, Signatures...>;
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using cancellation_slot_type = cancellation_slot;
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constexpr any_completion_handler()
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: fn_table_(nullptr),
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impl_(nullptr)
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{
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}
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constexpr any_completion_handler(nullptr_t)
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: fn_table_(nullptr),
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impl_(nullptr)
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{
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}
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template <typename H, typename Handler = typename decay<H>::type>
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any_completion_handler(H&& h)
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: fn_table_(
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&detail::any_completion_handler_fn_table_instance<
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Handler, Signatures...>::value),
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impl_(detail::any_completion_handler_impl<Handler>::create(
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(get_associated_cancellation_slot)(h), ASIO_MOVE_CAST(H)(h)))
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{
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}
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any_completion_handler(any_completion_handler&& other) ASIO_NOEXCEPT
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: fn_table_(other.fn_table_),
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impl_(other.impl_)
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{
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other.fn_table_ = nullptr;
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other.impl_ = nullptr;
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}
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any_completion_handler& operator=(
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any_completion_handler&& other) ASIO_NOEXCEPT
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{
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any_completion_handler(other).swap(*this);
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return *this;
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}
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|
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any_completion_handler& operator=(nullptr_t) ASIO_NOEXCEPT
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{
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any_completion_handler().swap(*this);
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return *this;
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}
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|
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~any_completion_handler()
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|
{
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if (impl_)
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fn_table_->destroy(impl_);
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}
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constexpr explicit operator bool() const ASIO_NOEXCEPT
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|
{
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return impl_ != nullptr;
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|
}
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|
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constexpr bool operator!() const ASIO_NOEXCEPT
|
|
{
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|
return impl_ == nullptr;
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|
}
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|
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void swap(any_completion_handler& other) ASIO_NOEXCEPT
|
|
{
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std::swap(fn_table_, other.fn_table_);
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std::swap(impl_, other.impl_);
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|
}
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|
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|
allocator_type get_allocator() const ASIO_NOEXCEPT
|
|
{
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|
return allocator_type(0, *this);
|
|
}
|
|
|
|
cancellation_slot_type get_cancellation_slot() const ASIO_NOEXCEPT
|
|
{
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|
return impl_->get_cancellation_slot();
|
|
}
|
|
|
|
template <typename... Args>
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|
auto operator()(Args&&... args)
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|
-> decltype(fn_table_->call(impl_, ASIO_MOVE_CAST(Args)(args)...))
|
|
{
|
|
if (detail::any_completion_handler_impl_base* impl = impl_)
|
|
{
|
|
impl_ = nullptr;
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|
return fn_table_->call(impl, ASIO_MOVE_CAST(Args)(args)...);
|
|
}
|
|
std::bad_function_call ex;
|
|
asio::detail::throw_exception(ex);
|
|
}
|
|
|
|
friend constexpr bool operator==(
|
|
const any_completion_handler& a, nullptr_t) ASIO_NOEXCEPT
|
|
{
|
|
return a.impl_ == nullptr;
|
|
}
|
|
|
|
friend constexpr bool operator==(
|
|
nullptr_t, const any_completion_handler& b) ASIO_NOEXCEPT
|
|
{
|
|
return nullptr == b.impl_;
|
|
}
|
|
|
|
friend constexpr bool operator!=(
|
|
const any_completion_handler& a, nullptr_t) ASIO_NOEXCEPT
|
|
{
|
|
return a.impl_ != nullptr;
|
|
}
|
|
|
|
friend constexpr bool operator!=(
|
|
nullptr_t, const any_completion_handler& b) ASIO_NOEXCEPT
|
|
{
|
|
return nullptr != b.impl_;
|
|
}
|
|
};
|
|
|
|
template <typename... Signatures, typename Candidate>
|
|
struct associated_executor<any_completion_handler<Signatures...>, Candidate>
|
|
{
|
|
using type = any_completion_executor;
|
|
|
|
static type get(const any_completion_handler<Signatures...>& handler,
|
|
const Candidate& candidate = Candidate()) ASIO_NOEXCEPT
|
|
{
|
|
return handler.fn_table_->executor(handler.impl_,
|
|
any_completion_executor(std::nothrow, candidate));
|
|
}
|
|
};
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // (defined(ASIO_HAS_STD_TUPLE)
|
|
// && defined(ASIO_HAS_MOVE)
|
|
// && defined(ASIO_HAS_VARIADIC_TEMPLATES))
|
|
// || defined(GENERATING_DOCUMENTATION)
|
|
|
|
#endif // ASIO_ANY_COMPLETION_HANDLER_HPP
|