119 lines
3.7 KiB
C++
119 lines
3.7 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 {
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template <typename Receiver, typename... Values>
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struct _op {
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struct type;
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};
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template <typename Receiver, typename... Values>
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using operation = typename _op<remove_cvref_t<Receiver>, Values...>::type;
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template <typename Receiver, typename... Values>
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struct _op<Receiver, Values...>::type {
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UNIFEX_NO_UNIQUE_ADDRESS std::tuple<Values...> values_;
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UNIFEX_NO_UNIQUE_ADDRESS Receiver receiver_;
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void start() & noexcept {
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UNIFEX_TRY {
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std::apply(
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[&](Values&&... values) {
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unifex::set_value((Receiver &&) receiver_, (Values &&) values...);
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},
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std::move(values_));
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} UNIFEX_CATCH (...) {
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unifex::set_error((Receiver &&) receiver_, std::current_exception());
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}
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}
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};
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template <typename... Values>
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struct _sender {
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class type;
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};
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template <typename... Values>
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using sender = typename _sender<std::decay_t<Values>...>::type;
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template <typename... Values>
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class _sender<Values...>::type {
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UNIFEX_NO_UNIQUE_ADDRESS std::tuple<Values...> values_;
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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<Tuple<Values...>>;
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template <template <typename...> class Variant>
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using error_types = Variant<std::exception_ptr>;
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static constexpr bool sends_done = false;
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template(typename... Values2)
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(requires (sizeof...(Values2) == sizeof...(Values)) AND
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constructible_from<std::tuple<Values...>, Values2...>)
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explicit type(std::in_place_t, Values2&&... values)
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noexcept(std::is_nothrow_constructible_v<std::tuple<Values...>, Values2...>)
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: values_((Values2 &&) values...) {}
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template(typename This, typename Receiver)
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(requires same_as<remove_cvref_t<This>, type> AND
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receiver<Receiver> AND
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constructible_from<std::tuple<Values...>, member_t<This, std::tuple<Values...>>>)
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friend auto tag_invoke(tag_t<connect>, This&& that, Receiver&& r)
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noexcept(std::is_nothrow_constructible_v<std::tuple<Values...>, member_t<This, std::tuple<Values...>>>)
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-> operation<Receiver, Values...> {
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return {static_cast<This&&>(that).values_, static_cast<Receiver&&>(r)};
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}
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friend constexpr blocking_kind tag_invoke(tag_t<blocking>, const type&) noexcept {
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return blocking_kind::always_inline;
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}
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};
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} // namespace _just
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namespace _just_cpo {
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inline const struct just_fn {
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template <typename... Values>
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constexpr auto operator()(Values&&... values) const
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noexcept(std::is_nothrow_constructible_v<_just::sender<Values...>, std::in_place_t, Values...>)
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-> _just::sender<Values...> {
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return _just::sender<Values...>{std::in_place, (Values&&)values...};
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}
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} just{};
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} // namespace _just_cpo
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using _just_cpo::just;
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} // namespace unifex
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#include <unifex/detail/epilogue.hpp>
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