90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License Version 2.0 with LLVM Exceptions
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* https://llvm.org/LICENSE.txt
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <unifex/config.hpp>
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#include <unifex/receiver_concepts.hpp>
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#include <unifex/sender_concepts.hpp>
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#include <unifex/blocking.hpp>
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#include <unifex/std_concepts.hpp>
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#include <exception>
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include <unifex/detail/prologue.hpp>
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namespace unifex {
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namespace _just_done {
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template <typename Receiver>
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struct _op {
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struct type;
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};
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template <typename Receiver>
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using operation = typename _op<remove_cvref_t<Receiver>>::type;
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template <typename Receiver>
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struct _op<Receiver>::type {
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UNIFEX_NO_UNIQUE_ADDRESS Receiver receiver_;
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void start() & noexcept {
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unifex::set_done((Receiver &&) receiver_);
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}
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};
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class sender {
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public:
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template <
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template <typename...> class Variant,
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template <typename...> class Tuple>
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using value_types = Variant<>;
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template <template <typename...> class Variant>
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using error_types = Variant<>;
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static constexpr bool sends_done = true;
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template(typename This, typename Receiver)
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(requires same_as<remove_cvref_t<This>, sender> AND
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receiver<Receiver>)
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friend auto tag_invoke(tag_t<connect>, This&&, Receiver&& r)
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noexcept
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-> operation<Receiver> {
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return {static_cast<Receiver&&>(r)};
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}
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friend constexpr blocking_kind tag_invoke(tag_t<blocking>, const sender&) noexcept {
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return blocking_kind::always_inline;
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}
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};
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} // namespace _just_done
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namespace _just_done_cpo {
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inline const struct just_done_fn {
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constexpr auto operator()() const noexcept
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-> _just_done::sender {
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return _just_done::sender{};
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}
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} just_done{};
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} // namespace _just_done_cpo
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using _just_done_cpo::just_done;
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} // namespace unifex
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#include <unifex/detail/epilogue.hpp>
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