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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/flow_receiver.h>
- #include <folly/experimental/pushmi/executor.h>
- #include <folly/experimental/pushmi/trampoline.h>
- namespace pushmi {
- template <class PE, class PV, class E, class... VN>
- class any_flow_many_sender {
- union data {
- void* pobj_ = nullptr;
- char buffer_[sizeof(std::tuple<VN...>)]; // 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 any_executor<E> s_executor(data&) { return {}; }
- static void s_submit(data&, any_flow_receiver<PE, PV, E, VN...>) {}
- void (*op_)(data&, data*) = vtable::s_op;
- any_executor<E> (*executor_)(data&) = vtable::s_executor;
- void (*submit_)(data&, any_flow_receiver<PE, PV, E, VN...>) = vtable::s_submit;
- };
- static constexpr vtable const noop_ {};
- vtable const* vptr_ = &noop_;
- template <class Wrapped>
- any_flow_many_sender(Wrapped obj, std::false_type) : any_flow_many_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 any_executor<E> executor(data& src) {
- return any_executor<E>{::pushmi::executor(*static_cast<Wrapped*>(src.pobj_))};
- }
- static void submit(data& src, any_flow_receiver<PE, PV, E, VN...> out) {
- ::pushmi::submit(*static_cast<Wrapped*>(src.pobj_), std::move(out));
- }
- };
- static const vtable vtbl{s::op, s::executor, s::submit};
- data_.pobj_ = new Wrapped(std::move(obj));
- vptr_ = &vtbl;
- }
- template <class Wrapped>
- any_flow_many_sender(Wrapped obj, std::true_type) noexcept
- : any_flow_many_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 any_executor<E> executor(data& src) {
- return any_executor<E>{::pushmi::executor(*static_cast<Wrapped*>((void*)src.buffer_))};
- }
- static void submit(data& src, any_flow_receiver<PE, PV, E, VN...> out) {
- ::pushmi::submit(
- *static_cast<Wrapped*>((void*)src.buffer_),
- std::move(out));
- }
- };
- static const vtable vtbl{s::op, 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_flow_many_sender>::value, U>;
- public:
- using properties = property_set<is_sender<>, is_flow<>, is_many<>>;
- any_flow_many_sender() = default;
- any_flow_many_sender(any_flow_many_sender&& that) noexcept
- : any_flow_many_sender() {
- that.vptr_->op_(that.data_, &data_);
- std::swap(that.vptr_, vptr_);
- }
- PUSHMI_TEMPLATE (class Wrapped)
- (requires FlowSender<wrapped_t<Wrapped>, is_many<>>)
- explicit any_flow_many_sender(Wrapped obj) noexcept(insitu<Wrapped>())
- : any_flow_many_sender{std::move(obj), bool_<insitu<Wrapped>()>{}} {}
- ~any_flow_many_sender() {
- vptr_->op_(data_, nullptr);
- }
- any_flow_many_sender& operator=(any_flow_many_sender&& that) noexcept {
- this->~any_flow_many_sender();
- new ((void*)this) any_flow_many_sender(std::move(that));
- return *this;
- }
- any_executor<E> executor() {
- return vptr_->executor_(data_);
- }
- void submit(any_flow_receiver<PE, PV, E, VN...> out) {
- vptr_->submit_(data_, std::move(out));
- }
- };
- // Class static definitions:
- template <class PE, class PV, class E, class... VN>
- constexpr typename any_flow_many_sender<PE, PV, E, VN...>::vtable const
- any_flow_many_sender<PE, PV, E, VN...>::noop_;
- template <class SF, class EXF>
- class flow_many_sender<SF, EXF> {
- SF sf_;
- EXF exf_;
- public:
- using properties = property_set<is_sender<>, is_flow<>, is_many<>>;
- constexpr flow_many_sender() = default;
- constexpr explicit flow_many_sender(SF sf)
- : sf_(std::move(sf)) {}
- constexpr flow_many_sender(SF sf, EXF exf)
- : sf_(std::move(sf)), exf_(std::move(exf)) {}
- auto executor() { return exf_(); }
- PUSHMI_TEMPLATE(class Out)
- (requires FlowReceiver<Out> && Invocable<SF&, Out>)
- void submit(Out out) {
- sf_(std::move(out));
- }
- };
- template <PUSHMI_TYPE_CONSTRAINT(Sender<is_many<>, is_flow<>>) Data, class DSF, class DEXF>
- class flow_many_sender<Data, DSF, DEXF> {
- Data data_;
- DSF sf_;
- DEXF exf_;
- public:
- using properties = property_set_insert_t<properties_t<Data>, property_set<is_sender<>, is_flow<>, is_many<>>>;
- constexpr flow_many_sender() = default;
- constexpr explicit flow_many_sender(Data data)
- : data_(std::move(data)) {}
- constexpr flow_many_sender(Data data, DSF sf)
- : data_(std::move(data)), sf_(std::move(sf)) {}
- constexpr flow_many_sender(Data data, DSF sf, DEXF exf)
- : data_(std::move(data)), sf_(std::move(sf)), exf_(std::move(exf)) {}
- auto executor() { return exf_(data_); }
- PUSHMI_TEMPLATE(class Out)
- (requires PUSHMI_EXP(lazy::FlowReceiver<Out> PUSHMI_AND
- lazy::Invocable<DSF&, Data&, Out>))
- void submit(Out out) {
- sf_(data_, std::move(out));
- }
- };
- template <>
- class flow_many_sender<>
- : public flow_many_sender<ignoreSF, trampolineEXF> {
- public:
- flow_many_sender() = default;
- };
- ////////////////////////////////////////////////////////////////////////////////
- // make_flow_many_sender
- PUSHMI_INLINE_VAR constexpr struct make_flow_many_sender_fn {
- inline auto operator()() const {
- return flow_many_sender<ignoreSF, trampolineEXF>{};
- }
- PUSHMI_TEMPLATE(class SF)
- (requires True<> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- auto operator()(SF sf) const {
- return flow_many_sender<SF, trampolineEXF>{std::move(sf)};
- }
- PUSHMI_TEMPLATE(class SF, class EXF)
- (requires True<> && Invocable<EXF&> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- auto operator()(SF sf, EXF exf) const {
- return flow_many_sender<SF, EXF>{std::move(sf), std::move(exf)};
- }
- PUSHMI_TEMPLATE(class Data)
- (requires True<> && Sender<Data, is_many<>, is_flow<>>)
- auto operator()(Data d) const {
- return flow_many_sender<Data, passDSF, passDEXF>{std::move(d)};
- }
- PUSHMI_TEMPLATE(class Data, class DSF)
- (requires Sender<Data, is_many<>, is_flow<>>)
- auto operator()(Data d, DSF sf) const {
- return flow_many_sender<Data, DSF, passDEXF>{std::move(d), std::move(sf)};
- }
- PUSHMI_TEMPLATE(class Data, class DSF, class DEXF)
- (requires Sender<Data, is_many<>, is_flow<>> && Invocable<DEXF&, Data&>)
- auto operator()(Data d, DSF sf, DEXF exf) const {
- return flow_many_sender<Data, DSF, DEXF>{std::move(d), std::move(sf), std::move(exf)};
- }
- } const make_flow_many_sender {};
- ////////////////////////////////////////////////////////////////////////////////
- // deduction guides
- #if __cpp_deduction_guides >= 201703
- flow_many_sender() -> flow_many_sender<ignoreSF, trampolineEXF>;
- PUSHMI_TEMPLATE(class SF)
- (requires True<> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- flow_many_sender(SF) -> flow_many_sender<SF, trampolineEXF>;
- PUSHMI_TEMPLATE(class SF, class EXF)
- (requires True<> && Invocable<EXF&> PUSHMI_BROKEN_SUBSUMPTION(&& not Sender<SF>))
- flow_many_sender(SF, EXF) -> flow_many_sender<SF, EXF>;
- PUSHMI_TEMPLATE(class Data)
- (requires True<> && Sender<Data, is_many<>, is_flow<>>)
- flow_many_sender(Data) -> flow_many_sender<Data, passDSF, passDEXF>;
- PUSHMI_TEMPLATE(class Data, class DSF)
- (requires Sender<Data, is_many<>, is_flow<>>)
- flow_many_sender(Data, DSF) -> flow_many_sender<Data, DSF, passDEXF>;
- PUSHMI_TEMPLATE(class Data, class DSF, class DEXF)
- (requires Sender<Data, is_many<>, is_flow<>> && Invocable<DEXF&, Data&>)
- flow_many_sender(Data, DSF, DEXF) -> flow_many_sender<Data, DSF, DEXF>;
- #endif
- template<>
- struct construct_deduced<flow_many_sender>
- : make_flow_many_sender_fn {};
- // // TODO constrain me
- // template <class V, class E = std::exception_ptr, Sender Wrapped>
- // auto erase_cast(Wrapped w) {
- // return flow_many_sender<V, E>{std::move(w)};
- // }
- } // namespace pushmi
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