105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
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//
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// experimental/impl/promise.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2021-2022 Klemens D. Morgenstern
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// (klemens dot morgenstern at gmx dot net)
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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_EXPERIMENTAL_IMPL_PROMISE_HPP
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#define BOOST_ASIO_EXPERIMENTAL_IMPL_PROMISE_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/cancellation_signal.hpp>
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#include <boost/asio/experimental/detail/completion_handler_erasure.hpp>
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#include <tuple>
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#include <optional>
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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 experimental {
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template<typename Signature = void(), typename Executor = any_io_executor>
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struct promise;
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namespace detail {
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template<typename Signature, typename Executor>
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struct promise_impl;
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template<typename ... Ts, typename Executor>
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struct promise_impl<void(Ts...), Executor>
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{
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using result_type = std::tuple<Ts...>;
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promise_impl(Executor executor = {})
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: executor(std::move(executor))
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{
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}
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std::optional<result_type> result;
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bool done{false};
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detail::completion_handler_erasure<void(Ts...), Executor> completion;
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cancellation_signal cancel;
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Executor executor;
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};
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template<typename Signature = void(), typename Executor = any_io_executor>
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struct promise_handler;
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template<typename Signature, typename Executor>
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struct promise_handler;
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template<typename ... Ts, typename Executor>
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struct promise_handler<void(Ts...), Executor>
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{
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using promise_type = promise<void(Ts...), Executor>;
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promise_handler(Executor executor) // get_associated_allocator(exec)
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: impl_{
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std::allocate_shared<promise_impl<void(Ts...), Executor>>(
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get_associated_allocator(executor))}
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{
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impl_->executor = std::move(executor);
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}
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std::shared_ptr<promise_impl<void(Ts...), Executor>> impl_;
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using cancellation_slot_type = cancellation_slot;
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cancellation_slot_type get_cancellation_slot() const noexcept
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{
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return impl_->cancel.slot();
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}
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auto make_promise() -> promise<void(Ts...), Executor>
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{
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return {impl_};
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}
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void operator()(std::remove_reference_t<Ts>... ts)
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{
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assert(impl_);
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impl_->result.emplace(std::move(ts)...);
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impl_->done = true;
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if (auto f = std::exchange(impl_->completion, nullptr); f != nullptr)
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std::apply(std::move(f), std::move(*impl_->result));
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}
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};
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} // namespace detail
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} // namespace experimental
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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_EXPERIMENTAL_IMPL_PROMISE_HPP
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