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- #pragma once
- /*
- * Copyright 2018-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include <folly/experimental/pushmi/receiver.h>
- #include <folly/experimental/pushmi/executor.h>
- #include <folly/experimental/pushmi/inline.h>
- namespace pushmi {
- template <class E, class CV, class... VN>
- class any_constrained_single_sender {
- union data {
- void* pobj_ = nullptr;
- char buffer_[sizeof(std::promise<int>)]; // can hold a V in-situ
- } data_{};
- template <class Wrapped>
- static constexpr bool insitu() {
- return sizeof(Wrapped) <= sizeof(data::buffer_) &&
- std::is_nothrow_move_constructible<Wrapped>::value;
- }
- struct vtable {
- static void s_op(data&, data*) {}
- static CV s_top(data&) { return CV{}; }
- static any_constrained_executor<E, CV> s_executor(data&) { return {}; }
- static void s_submit(data&, CV, any_receiver<E, VN...>) {}
- void (*op_)(data&, data*) = vtable::s_op;
- CV (*top_)(data&) = vtable::s_top;
- any_constrained_executor<E, CV> (*executor_)(data&) = vtable::s_executor;
- void (*submit_)(data&, CV, any_receiver<E, VN...>) = vtable::s_submit;
- };
- static constexpr vtable const noop_ {};
- vtable const* vptr_ = &noop_;
- template <class Wrapped>
- any_constrained_single_sender(Wrapped obj, std::false_type)
- : any_constrained_single_sender() {
- struct s {
- static void op(data& src, data* dst) {
- if (dst)
- dst->pobj_ = std::exchange(src.pobj_, nullptr);
- delete static_cast<Wrapped const*>(src.pobj_);
- }
- static CV top(data& src) {
- return ::pushmi::top(*static_cast<Wrapped*>(src.pobj_));
- }
- static any_constrained_executor<E, CV> executor(data& src) {
- return any_constrained_executor<E, CV>{::pushmi::executor(*static_cast<Wrapped*>(src.pobj_))};
- }
- static void submit(data& src, CV at, any_receiver<E, VN...> out) {
- ::pushmi::submit(
- *static_cast<Wrapped*>(src.pobj_),
- std::move(at),
- std::move(out));
- }
- };
- static const vtable vtbl{s::op, s::top, s::executor, s::submit};
- data_.pobj_ = new Wrapped(std::move(obj));
- vptr_ = &vtbl;
- }
- template <class Wrapped>
- any_constrained_single_sender(Wrapped obj, std::true_type) noexcept
- : any_constrained_single_sender() {
- struct s {
- static void op(data& src, data* dst) {
- if (dst)
- new (dst->buffer_) Wrapped(
- std::move(*static_cast<Wrapped*>((void*)src.buffer_)));
- static_cast<Wrapped const*>((void*)src.buffer_)->~Wrapped();
- }
- static CV top(data& src) {
- return ::pushmi::top(*static_cast<Wrapped*>((void*)src.buffer_));
- }
- static any_constrained_executor<E, CV> executor(data& src) {
- return any_constrained_executor<E, CV>{::pushmi::executor(*static_cast<Wrapped*>((void*)src.buffer_))};
- }
- static void submit(data& src, CV cv, any_receiver<E, VN...> out) {
- ::pushmi::submit(
- *static_cast<Wrapped*>((void*)src.buffer_),
- std::move(cv),
- std::move(out));
- }
- };
- static const vtable vtbl{s::op, s::top, s::executor, s::submit};
- new (data_.buffer_) Wrapped(std::move(obj));
- vptr_ = &vtbl;
- }
- template <class T, class U = std::decay_t<T>>
- using wrapped_t =
- std::enable_if_t<!std::is_same<U, any_constrained_single_sender>::value, U>;
- public:
- using properties = property_set<is_constrained<>, is_single<>>;
- any_constrained_single_sender() = default;
- any_constrained_single_sender(any_constrained_single_sender&& that) noexcept
- : any_constrained_single_sender() {
- that.vptr_->op_(that.data_, &data_);
- std::swap(that.vptr_, vptr_);
- }
- PUSHMI_TEMPLATE (class Wrapped)
- (requires ConstrainedSenderTo<wrapped_t<Wrapped>, any_receiver<E, VN...>>)
- explicit any_constrained_single_sender(Wrapped obj) noexcept(insitu<Wrapped>())
- : any_constrained_single_sender{std::move(obj), bool_<insitu<Wrapped>()>{}} {
- }
- ~any_constrained_single_sender() {
- vptr_->op_(data_, nullptr);
- }
- any_constrained_single_sender& operator=(any_constrained_single_sender&& that) noexcept {
- this->~any_constrained_single_sender();
- new ((void*)this) any_constrained_single_sender(std::move(that));
- return *this;
- }
- CV top() {
- return vptr_->top_(data_);
- }
- any_constrained_executor<E, CV> executor() {
- return vptr_->executor_(data_);
- }
- void submit(CV at, any_receiver<E, VN...> out) {
- vptr_->submit_(data_, std::move(at), std::move(out));
- }
- };
- // Class static definitions:
- template <class E, class CV, class... VN>
- constexpr typename any_constrained_single_sender<E, CV, VN...>::vtable const
- any_constrained_single_sender<E, CV, VN...>::noop_;
- template<class SF, class ZF, class EXF>
- // (requires Invocable<ZF&> && Invocable<EXF&> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- class constrained_single_sender<SF, ZF, EXF> {
- SF sf_;
- ZF zf_;
- EXF exf_;
- public:
- using properties = property_set<is_constrained<>, is_single<>>;
- constexpr constrained_single_sender() = default;
- constexpr explicit constrained_single_sender(SF sf)
- : sf_(std::move(sf)) {}
- constexpr constrained_single_sender(SF sf, EXF exf)
- : sf_(std::move(sf)), exf_(std::move(exf)) {}
- constexpr constrained_single_sender(SF sf, EXF exf, ZF zf)
- : sf_(std::move(sf)), zf_(std::move(zf)), exf_(std::move(exf)) {}
- auto top() {
- return zf_();
- }
- auto executor() { return exf_(); }
- PUSHMI_TEMPLATE(class CV, class Out)
- (requires Regular<CV> && Receiver<Out> &&
- Invocable<SF&, CV, Out>)
- void submit(CV cv, Out out) {
- sf_(std::move(cv), std::move(out));
- }
- };
- template <PUSHMI_TYPE_CONSTRAINT(ConstrainedSender<is_single<>>) Data, class DSF, class DZF, class DEXF>
- #if __cpp_concepts
- requires Invocable<DZF&, Data&> && Invocable<DEXF&, Data&>
- #endif
- class constrained_single_sender<Data, DSF, DZF, DEXF> {
- Data data_;
- DSF sf_;
- DZF zf_;
- DEXF exf_;
- public:
- using properties = property_set_insert_t<properties_t<Data>, property_set<is_single<>>>;
- constexpr constrained_single_sender() = default;
- constexpr explicit constrained_single_sender(Data data)
- : data_(std::move(data)) {}
- constexpr constrained_single_sender(Data data, DSF sf, DEXF exf = DEXF{})
- : data_(std::move(data)), sf_(std::move(sf)), exf_(std::move(exf)) {}
- constexpr constrained_single_sender(Data data, DSF sf, DEXF exf, DZF zf)
- : data_(std::move(data)), sf_(std::move(sf)), zf_(std::move(zf)), exf_(std::move(exf)) {}
- auto top() {
- return zf_(data_);
- }
- auto executor() { return exf_(data_); }
- PUSHMI_TEMPLATE(class CV, class Out)
- (requires Regular<CV> && Receiver<Out> &&
- Invocable<DSF&, Data&, CV, Out>)
- void submit(CV cv, Out out) {
- sf_(data_, std::move(cv), std::move(out));
- }
- };
- template <>
- class constrained_single_sender<>
- : public constrained_single_sender<ignoreSF, priorityZeroF, inlineConstrainedEXF> {
- public:
- constrained_single_sender() = default;
- };
- ////////////////////////////////////////////////////////////////////////////////
- // make_constrained_single_sender
- PUSHMI_INLINE_VAR constexpr struct make_constrained_single_sender_fn {
- inline auto operator()() const {
- return constrained_single_sender<ignoreSF, priorityZeroF, inlineConstrainedEXF>{};
- }
- PUSHMI_TEMPLATE(class SF)
- (requires True<> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- auto operator()(SF sf) const {
- return constrained_single_sender<SF, priorityZeroF, inlineConstrainedEXF>{std::move(sf)};
- }
- PUSHMI_TEMPLATE (class SF, class EXF)
- (requires Invocable<EXF&> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- auto operator()(SF sf, EXF exf) const {
- return constrained_single_sender<SF, priorityZeroF, EXF>{std::move(sf), std::move(exf)};
- }
- PUSHMI_TEMPLATE (class SF, class ZF, class EXF)
- (requires Invocable<ZF&> && Invocable<EXF&> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- auto operator()(SF sf, EXF exf, ZF zf) const {
- return constrained_single_sender<SF, ZF, EXF>{std::move(sf), std::move(exf), std::move(zf)};
- }
- PUSHMI_TEMPLATE (class Data)
- (requires ConstrainedSender<Data, is_single<>>)
- auto operator()(Data d) const {
- return constrained_single_sender<Data, passDSF, passDZF, passDEXF>{std::move(d)};
- }
- PUSHMI_TEMPLATE (class Data, class DSF)
- (requires ConstrainedSender<Data, is_single<>>)
- auto operator()(Data d, DSF sf) const {
- return constrained_single_sender<Data, DSF, passDZF, passDEXF>{std::move(d), std::move(sf)};
- }
- PUSHMI_TEMPLATE (class Data, class DSF, class DEXF)
- (requires ConstrainedSender<Data, is_single<>> && Invocable<DEXF&, Data&>)
- auto operator()(Data d, DSF sf, DEXF exf) const {
- return constrained_single_sender<Data, DSF, passDZF, DEXF>{std::move(d), std::move(sf),
- std::move(exf)};
- }
- PUSHMI_TEMPLATE (class Data, class DSF, class DZF, class DEXF)
- (requires ConstrainedSender<Data, is_single<>> && Invocable<DZF&, Data&> && Invocable<DEXF&, Data&>)
- auto operator()(Data d, DSF sf, DEXF exf, DZF zf) const {
- return constrained_single_sender<Data, DSF, DZF, DEXF>{std::move(d), std::move(sf),
- std::move(exf), std::move(zf)};
- }
- } const make_constrained_single_sender {};
- ////////////////////////////////////////////////////////////////////////////////
- // deduction guides
- #if __cpp_deduction_guides >= 201703
- constrained_single_sender() -> constrained_single_sender<ignoreSF, priorityZeroF, inlineConstrainedEXF>;
- PUSHMI_TEMPLATE(class SF)
- (requires True<> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- constrained_single_sender(SF) -> constrained_single_sender<SF, priorityZeroF, inlineConstrainedEXF>;
- PUSHMI_TEMPLATE (class SF, class EXF)
- (requires Invocable<EXF&> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- constrained_single_sender(SF, EXF) -> constrained_single_sender<SF, priorityZeroF, EXF>;
- PUSHMI_TEMPLATE (class SF, class ZF, class EXF)
- (requires Invocable<ZF&> && Invocable<EXF&> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- constrained_single_sender(SF, EXF, ZF) -> constrained_single_sender<SF, ZF, EXF>;
- PUSHMI_TEMPLATE (class Data, class DSF)
- (requires ConstrainedSender<Data, is_single<>>)
- constrained_single_sender(Data, DSF) -> constrained_single_sender<Data, DSF, passDZF, passDEXF>;
- PUSHMI_TEMPLATE (class Data, class DSF, class DEXF)
- (requires ConstrainedSender<Data, is_single<>> && Invocable<DEXF&, Data&>)
- constrained_single_sender(Data, DSF, DEXF) -> constrained_single_sender<Data, DSF, passDZF, DEXF>;
- PUSHMI_TEMPLATE (class Data, class DSF, class DZF, class DEXF)
- (requires ConstrainedSender<Data, is_single<>> && Invocable<DZF&, Data&> && Invocable<DEXF&, Data&>)
- constrained_single_sender(Data, DSF, DEXF, DZF) -> constrained_single_sender<Data, DSF, DZF, DEXF>;
- #endif
- template<>
- struct construct_deduced<constrained_single_sender>
- : make_constrained_single_sender_fn {};
- } // namespace pushmi
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