222 lines
7.3 KiB
C++
222 lines
7.3 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/async_trace.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/tag_invoke.hpp>
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#include <unifex/type_list.hpp>
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#include <unifex/type_traits.hpp>
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#include <unifex/std_concepts.hpp>
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#include <unifex/bind_back.hpp>
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#include <type_traits>
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#include <unifex/detail/prologue.hpp>
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namespace unifex {
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namespace _demat {
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template <typename Receiver>
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struct _receiver {
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class type;
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};
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template <typename Receiver>
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using receiver_t = typename _receiver<remove_cvref_t<Receiver>>::type;
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template <typename Receiver>
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class _receiver<Receiver>::type {
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public:
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template(typename Receiver2)
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(requires constructible_from<Receiver, Receiver2>)
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explicit type(Receiver2&& receiver) noexcept(
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std::is_nothrow_constructible_v<Receiver, Receiver2>)
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: receiver_(static_cast<Receiver2&&>(receiver)) {}
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template(typename CPO, typename... Values)
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(requires is_receiver_cpo_v<CPO> AND is_callable_v<CPO, Receiver, Values...>)
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void set_value(CPO cpo, Values&&... values) && noexcept(
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is_nothrow_callable_v<CPO, Receiver, Values...>) {
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static_cast<CPO&&>(cpo)(
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static_cast<Receiver&&>(receiver_),
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static_cast<Values&&>(values)...);
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}
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template(typename Error)
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(requires receiver<Receiver, Error>)
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void set_error(Error&& error) && noexcept {
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unifex::set_error(
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static_cast<Receiver&&>(receiver_), static_cast<Error&&>(error));
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}
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void set_done() && noexcept {
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unifex::set_done(static_cast<Receiver&&>(receiver_));
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}
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template(typename CPO, UNIFEX_DECLARE_NON_DEDUCED_TYPE(R, type))
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(requires is_receiver_query_cpo_v<CPO> AND is_callable_v<CPO, const Receiver&>)
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friend auto tag_invoke(CPO cpo, const UNIFEX_USE_NON_DEDUCED_TYPE(R, type)& r)
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noexcept(is_nothrow_callable_v<CPO, const Receiver&>)
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-> callable_result_t<CPO, const Receiver&> {
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return static_cast<CPO&&>(cpo)(std::as_const(r.receiver_));
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}
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template <typename Func>
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friend void tag_invoke(tag_t<visit_continuations>, const type& r, Func&& func) noexcept(std::
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is_nothrow_invocable_v<
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Func&,
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const Receiver&>) {
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std::invoke(func, std::as_const(r.receiver_));
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}
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private:
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Receiver receiver_;
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};
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template <typename CPO, template <typename...> class Tuple>
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struct tuple {
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private:
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template <typename... Values>
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struct apply_impl;
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template <typename First, typename... Rest>
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struct apply_impl<First, Rest...>
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: std::conditional<
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std::is_base_of_v<CPO, std::decay_t<First>>,
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type_list<Tuple<Rest...>>,
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type_list<>> {};
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public:
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template <typename... Values>
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using apply = typename apply_impl<Values...>::type;
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};
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template <template <typename...> class Variant>
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struct variant {
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template <typename... Lists>
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using apply =
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typename concat_type_lists<Lists...>::type::template apply<Variant>;
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};
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template <typename Source>
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struct _sender {
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class type;
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};
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template <typename Source>
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using sender = typename _sender<remove_cvref_t<Source>>::type;
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template <typename Source>
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class _sender<Source>::type {
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template <template <typename...> class Variant>
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struct append_error_types {
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private:
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template <typename... Errors>
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struct impl {
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// Concatenate and deduplicate errors from value_types, error_types along with
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// std::exception_ptr.
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template <typename... OtherErrors>
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using apply = typename concat_type_lists_unique<
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type_list<Errors...>,
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type_list<OtherErrors...>,
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type_list<std::exception_ptr>>::template apply<Variant>;
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};
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public:
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template <typename... Errors>
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using apply =
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sender_error_types_t<Source, impl<Errors...>::template apply>;
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};
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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 =
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sender_value_types_t<
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Source,
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variant<Variant>::template apply,
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tuple<tag_t<set_value>, Tuple>::template apply>;
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template <template <typename...> class Variant>
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using error_types =
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sender_value_types_t<
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Source,
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variant<append_error_types<Variant>::template apply>::template apply,
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tuple<tag_t<set_error>, single_type_t>::template apply>;
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static constexpr bool sends_done = sender_traits<Source>::sends_done;
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template <typename Source2>
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explicit type(Source2&& source)
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noexcept(std::is_nothrow_constructible_v<Source, Source2>)
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: source_(static_cast<Source2&&>(source)) {}
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template(typename Self, typename Receiver)
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(requires same_as<remove_cvref_t<Self>, type> AND
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sender_to<member_t<Self, Source>, receiver_t<Receiver>>)
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friend auto tag_invoke(tag_t<unifex::connect>, Self&& self, Receiver&& r)
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noexcept(is_nothrow_connectable_v<member_t<Self, Source>, receiver_t<Receiver>> &&
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std::is_nothrow_constructible_v<remove_cvref_t<Receiver>, Receiver>)
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-> connect_result_t<member_t<Self, Source>, receiver_t<Receiver>> {
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return unifex::connect(
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static_cast<Self&&>(self).source_,
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receiver_t<Receiver>{static_cast<Receiver&&>(r)});
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}
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private:
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Source source_;
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};
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} // namespace _demat
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namespace _demat_cpo {
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inline const struct _fn {
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private:
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template <typename Sender>
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using _result_t =
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typename conditional_t<
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tag_invocable<_fn, Sender>,
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meta_tag_invoke_result<_fn>,
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meta_quote1<_demat::sender>>::template apply<Sender>;
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public:
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template(typename Sender)
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(requires tag_invocable<_fn, Sender>)
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auto operator()(Sender&& predecessor) const
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noexcept(is_nothrow_tag_invocable_v<_fn, Sender>)
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-> _result_t<Sender> {
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return unifex::tag_invoke(_fn{}, (Sender&&) predecessor);
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}
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template(typename Sender)
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(requires (!tag_invocable<_fn, Sender>))
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auto operator()(Sender&& predecessor) const
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noexcept(std::is_nothrow_constructible_v<remove_cvref_t<Sender>, Sender>)
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-> _result_t<Sender> {
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return _demat::sender<Sender>{(Sender &&) predecessor};
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}
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constexpr auto operator()() const
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noexcept(is_nothrow_callable_v<
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tag_t<bind_back>, _fn>)
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-> bind_back_result_t<_fn> {
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return bind_back(*this);
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}
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} dematerialize{};
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} // namespace _demat_cpo
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using _demat_cpo::dematerialize;
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} // namespace unifex
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#include <unifex/detail/epilogue.hpp>
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