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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/boosters.h>
- #include <future>
- namespace pushmi {
- template <class E, class... VN>
- class any_receiver {
- bool done_ = false;
- union data {
- void* pobj_ = nullptr;
- char buffer_[sizeof(std::promise<int>)]; // can hold a std::promise in-situ
- } data_{};
- template <class Wrapped>
- static constexpr bool insitu() noexcept {
- return sizeof(Wrapped) <= sizeof(data::buffer_) &&
- std::is_nothrow_move_constructible<Wrapped>::value;
- }
- struct vtable {
- static void s_op(data&, data*) {}
- static void s_done(data&) {}
- static void s_error(data&, E) noexcept {
- std::terminate();
- }
- static void s_value(data&, VN...) {}
- void (*op_)(data&, data*) = vtable::s_op;
- void (*done_)(data&) = vtable::s_done;
- void (*error_)(data&, E) noexcept = vtable::s_error;
- void (*value_)(data&, VN...) = vtable::s_value;
- };
- static constexpr vtable const noop_{};
- vtable const* vptr_ = &noop_;
- template <class T, class U = std::decay_t<T>>
- using wrapped_t = std::enable_if_t<!std::is_same<U, any_receiver>::value, U>;
- template <class Wrapped>
- static void check() {
- static_assert(
- ReceiveValue<Wrapped, VN...>,
- "Wrapped receiver must support values of type VN...");
- static_assert(
- ReceiveError<Wrapped, std::exception_ptr>,
- "Wrapped receiver must support std::exception_ptr and be noexcept");
- static_assert(
- NothrowInvocable<decltype(::pushmi::set_error), Wrapped, E>,
- "Wrapped receiver must support E and be noexcept");
- }
- template <class Wrapped>
- any_receiver(Wrapped obj, std::false_type) : any_receiver() {
- 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 void done(data& src) {
- ::pushmi::set_done(*static_cast<Wrapped*>(src.pobj_));
- }
- static void error(data& src, E e) noexcept {
- ::pushmi::set_error(*static_cast<Wrapped*>(src.pobj_), std::move(e));
- }
- static void value(data& src, VN... vn) {
- ::pushmi::set_value(
- *static_cast<Wrapped*>(src.pobj_), std::move(vn)...);
- }
- };
- static const vtable vtbl{s::op, s::done, s::error, s::value};
- data_.pobj_ = new Wrapped(std::move(obj));
- vptr_ = &vtbl;
- }
- template <class Wrapped>
- any_receiver(Wrapped obj, std::true_type) noexcept : any_receiver() {
- 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 void done(data& src) {
- ::pushmi::set_done(*static_cast<Wrapped*>((void*)src.buffer_));
- }
- static void error(data& src, E e) noexcept {
- ::pushmi::set_error(
- *static_cast<Wrapped*>((void*)src.buffer_), std::move(e));
- }
- static void value(data& src, VN... vn) {
- ::pushmi::set_value(
- *static_cast<Wrapped*>((void*)src.buffer_), std::move(vn)...);
- }
- };
- static const vtable vtbl{s::op, s::done, s::error, s::value};
- new ((void*)data_.buffer_) Wrapped(std::move(obj));
- vptr_ = &vtbl;
- }
- public:
- using properties = property_set<is_receiver<>>;
- any_receiver() = default;
- any_receiver(any_receiver&& that) noexcept : any_receiver() {
- that.vptr_->op_(that.data_, &data_);
- std::swap(that.vptr_, vptr_);
- }
- PUSHMI_TEMPLATE(class Wrapped)
- (requires ReceiveValue<wrapped_t<Wrapped>, VN...>&& ReceiveError<
- Wrapped,
- E>)
- explicit any_receiver(Wrapped obj) noexcept(insitu<Wrapped>())
- : any_receiver{std::move(obj), bool_<insitu<Wrapped>()>{}} {
- check<Wrapped>();
- }
- ~any_receiver() {
- vptr_->op_(data_, nullptr);
- }
- any_receiver& operator=(any_receiver&& that) noexcept {
- this->~any_receiver();
- new ((void*)this) any_receiver(std::move(that));
- return *this;
- }
- void value(VN&&... vn) {
- if (!done_) {
- // done_ = true;
- vptr_->value_(data_, (VN &&) vn...);
- }
- }
- void error(E e) noexcept {
- if (!done_) {
- done_ = true;
- vptr_->error_(data_, std::move(e));
- }
- }
- void done() {
- if (!done_) {
- done_ = true;
- vptr_->done_(data_);
- }
- }
- };
- // Class static definitions:
- template <class E, class... VN>
- constexpr
- typename any_receiver<E, VN...>::vtable const any_receiver<E, VN...>::noop_;
- template <class VF, class EF, class DF>
- #if __cpp_concepts
- requires Invocable<DF&>
- #endif
- class receiver<VF, EF, DF> {
- bool done_ = false;
- VF vf_;
- EF ef_;
- DF df_;
- static_assert(
- !detail::is_v<VF, on_error_fn>,
- "the first parameter is the value implementation, but on_error{} was passed");
- static_assert(
- !detail::is_v<EF, on_value_fn>,
- "the second parameter is the error implementation, but on_value{} was passed");
- static_assert(
- NothrowInvocable<EF&, std::exception_ptr>,
- "error function must be noexcept and support std::exception_ptr");
- public:
- using properties = property_set<is_receiver<>>;
- receiver() = default;
- constexpr explicit receiver(VF vf) : receiver(std::move(vf), EF{}, DF{}) {}
- constexpr explicit receiver(EF ef) : receiver(VF{}, std::move(ef), DF{}) {}
- constexpr explicit receiver(DF df) : receiver(VF{}, EF{}, std::move(df)) {}
- constexpr receiver(EF ef, DF df)
- : done_(false), vf_(), ef_(std::move(ef)), df_(std::move(df)) {}
- constexpr receiver(VF vf, EF ef, DF df = DF{})
- : done_(false),
- vf_(std::move(vf)),
- ef_(std::move(ef)),
- df_(std::move(df)) {}
- PUSHMI_TEMPLATE(class... VN)
- (requires Invocable<VF&, VN...>)
- void value(VN&&... vn) {
- if (done_) {
- return;
- }
- // done_ = true;
- vf_((VN &&) vn...);
- }
- PUSHMI_TEMPLATE(class E)
- (requires Invocable<EF&, E>)
- void error(E e) noexcept {
- static_assert(NothrowInvocable<EF&, E>, "error function must be noexcept");
- if (!done_) {
- done_ = true;
- ef_(std::move(e));
- }
- }
- void done() {
- if (!done_) {
- done_ = true;
- df_();
- }
- }
- };
- template <
- PUSHMI_TYPE_CONSTRAINT(Receiver) Data,
- class DVF,
- class DEF,
- class DDF>
- #if __cpp_concepts
- requires Invocable<DDF&, Data&>
- #endif
- class receiver<Data, DVF, DEF, DDF> {
- bool done_ = false;
- Data data_;
- DVF vf_;
- DEF ef_;
- DDF df_;
- static_assert(
- !detail::is_v<DVF, on_error_fn>,
- "the first parameter is the value implementation, but on_error{} was passed");
- static_assert(
- !detail::is_v<DEF, on_value_fn>,
- "the second parameter is the error implementation, but on_value{} was passed");
- static_assert(
- Invocable<DEF, Data&, std::exception_ptr>,
- "error function must support std::exception_ptr");
- static_assert(
- NothrowInvocable<DEF, Data&, std::exception_ptr>,
- "error function must be noexcept");
- public:
- using properties =
- property_set_insert_t<properties_t<Data>, property_set<is_receiver<>>>;
- constexpr explicit receiver(Data d)
- : receiver(std::move(d), DVF{}, DEF{}, DDF{}) {}
- constexpr receiver(Data d, DDF df)
- : done_(false), data_(std::move(d)), vf_(), ef_(), df_(df) {}
- constexpr receiver(Data d, DEF ef, DDF df = DDF{})
- : done_(false), data_(std::move(d)), vf_(), ef_(ef), df_(df) {}
- constexpr receiver(Data d, DVF vf, DEF ef = DEF{}, DDF df = DDF{})
- : done_(false), data_(std::move(d)), vf_(vf), ef_(ef), df_(df) {}
- Data& data() {
- return data_;
- }
- PUSHMI_TEMPLATE(class... VN)
- (requires Invocable<DVF&, Data&, VN...>)
- void value(VN&&... vn) {
- if (!done_) {
- // done_ = true;
- vf_(data_, (VN &&) vn...);
- }
- }
- PUSHMI_TEMPLATE(class E)
- (requires Invocable<DEF&, Data&, E>)
- void error(E e) noexcept {
- static_assert(
- NothrowInvocable<DEF&, Data&, E>, "error function must be noexcept");
- if (!done_) {
- done_ = true;
- ef_(data_, std::move(e));
- }
- }
- void done() {
- if (!done_) {
- done_ = true;
- df_(data_);
- }
- }
- };
- template <>
- class receiver<> : public receiver<ignoreVF, abortEF, ignoreDF> {
- public:
- receiver() = default;
- };
- PUSHMI_CONCEPT_DEF(
- template (class T)
- concept ReceiverDataArg,
- Receiver<T> &&
- not Invocable<T&>
- );
- ////////////////////////////////////////////////////////////////////////////////
- // make_receiver
- PUSHMI_INLINE_VAR constexpr struct make_receiver_fn {
- inline auto operator()() const {
- return receiver<>{};
- }
- PUSHMI_TEMPLATE(class VF)
- (requires PUSHMI_EXP(
- lazy::True<>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND not lazy::ReceiverDataArg<VF>)))
- auto operator()(VF vf) const {
- return receiver<VF, abortEF, ignoreDF>{std::move(vf)};
- }
- template <class... EFN>
- auto operator()(on_error_fn<EFN...> ef) const {
- return receiver<ignoreVF, on_error_fn<EFN...>, ignoreDF>{std::move(ef)};
- }
- template <class... DFN>
- auto operator()(on_done_fn<DFN...> df) const {
- return receiver<ignoreVF, abortEF, on_done_fn<DFN...>>{std::move(df)};
- }
- PUSHMI_TEMPLATE(class VF, class EF)
- (requires PUSHMI_EXP(
- lazy::True<>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND
- not lazy::ReceiverDataArg<VF> PUSHMI_AND
- not lazy::Invocable<EF&>)))
- auto operator()(VF vf, EF ef) const {
- return receiver<VF, EF, ignoreDF>{std::move(vf), std::move(ef)};
- }
- PUSHMI_TEMPLATE(class EF, class DF)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::Invocable<DF&>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND not lazy::ReceiverDataArg<EF>)))
- auto operator()(EF ef, DF df) const {
- return receiver<ignoreVF, EF, DF>{std::move(ef), std::move(df)};
- }
- PUSHMI_TEMPLATE(class VF, class EF, class DF)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::Invocable<DF&>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND not lazy::ReceiverDataArg<VF>)))
- auto operator()(VF vf, EF ef, DF df) const {
- return receiver<VF, EF, DF>{std::move(vf), std::move(ef), std::move(df)};
- }
- PUSHMI_TEMPLATE(class Data)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- auto operator()(Data d) const {
- return receiver<Data, passDVF, passDEF, passDDF>{std::move(d)};
- }
- PUSHMI_TEMPLATE(class Data, class DVF)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- auto operator()(Data d, DVF vf) const {
- return receiver<Data, DVF, passDEF, passDDF>{std::move(d), std::move(vf)};
- }
- PUSHMI_TEMPLATE(class Data, class... DEFN)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- auto operator()(Data d, on_error_fn<DEFN...> ef) const {
- return receiver<Data, passDVF, on_error_fn<DEFN...>, passDDF>{std::move(d), std::move(ef)};
- }
- PUSHMI_TEMPLATE(class Data, class... DDFN)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- auto operator()(Data d, on_done_fn<DDFN...> df) const {
- return receiver<Data, passDVF, passDEF, on_done_fn<DDFN...>>{std::move(d), std::move(df)};
- }
- PUSHMI_TEMPLATE(class Data, class DVF, class... DEFN)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- auto operator()(Data d, DVF vf, on_error_fn<DEFN...> ef) const {
- return receiver<Data, DVF, on_error_fn<DEFN...>, passDDF>{std::move(d), std::move(vf), std::move(ef)};
- }
- PUSHMI_TEMPLATE(class Data, class DEF, class... DDFN)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- auto operator()(Data d, DEF ef, on_done_fn<DDFN...> df) const {
- return receiver<Data, passDVF, DEF, on_done_fn<DDFN...>>{std::move(d), std::move(ef), std::move(df)};
- }
- PUSHMI_TEMPLATE(class Data, class DVF, class DEF, class DDF)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data> PUSHMI_AND
- lazy::Invocable<DDF&, Data&>))
- auto operator()(Data d, DVF vf, DEF ef, DDF df) const {
- return receiver<Data, DVF, DEF, DDF>{std::move(d), std::move(vf), std::move(ef), std::move(df)};
- }
- } const make_receiver {};
- ////////////////////////////////////////////////////////////////////////////////
- // deduction guides
- #if __cpp_deduction_guides >= 201703
- receiver() -> receiver<>;
- PUSHMI_TEMPLATE(class VF)
- (requires PUSHMI_EXP(
- True<>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND not lazy::Receiver<VF>)))
- receiver(VF) -> receiver<VF, abortEF, ignoreDF>;
- template <class... EFN>
- receiver(on_error_fn<EFN...>) -> receiver<ignoreVF, on_error_fn<EFN...>, ignoreDF>;
- template <class... DFN>
- receiver(on_done_fn<DFN...>) -> receiver<ignoreVF, abortEF, on_done_fn<DFN...>>;
- PUSHMI_TEMPLATE(class VF, class EF)
- (requires PUSHMI_EXP(
- lazy::True<>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND
- not lazy::ReceiverDataArg<VF> PUSHMI_AND
- not lazy::Invocable<EF&>)))
- receiver(VF, EF) -> receiver<VF, EF, ignoreDF>;
- PUSHMI_TEMPLATE(class EF, class DF)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::Invocable<DF&>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND not lazy::ReceiverDataArg<EF>)))
- receiver(EF, DF) -> receiver<ignoreVF, EF, DF>;
- PUSHMI_TEMPLATE(class VF, class EF, class DF)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::Invocable<DF&>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND not lazy::ReceiverDataArg<VF>)))
- receiver(VF, EF, DF) -> receiver<VF, EF, DF>;
- PUSHMI_TEMPLATE(class Data)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- receiver(Data d) -> receiver<Data, passDVF, passDEF, passDDF>;
- PUSHMI_TEMPLATE(class Data, class DVF)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- receiver(Data d, DVF vf) -> receiver<Data, DVF, passDEF, passDDF>;
- PUSHMI_TEMPLATE(class Data, class... DEFN)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- receiver(Data d, on_error_fn<DEFN...>) ->
- receiver<Data, passDVF, on_error_fn<DEFN...>, passDDF>;
- PUSHMI_TEMPLATE(class Data, class... DDFN)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- receiver(Data d, on_done_fn<DDFN...>) ->
- receiver<Data, passDVF, passDEF, on_done_fn<DDFN...>>;
- PUSHMI_TEMPLATE(class Data, class DVF, class... DEFN)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>))
- receiver(Data d, DVF vf, on_error_fn<DEFN...> ef) -> receiver<Data, DVF, on_error_fn<DEFN...>, passDDF>;
- PUSHMI_TEMPLATE(class Data, class DEF, class... DDFN)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>
- PUSHMI_BROKEN_SUBSUMPTION(PUSHMI_AND not lazy::Invocable<DEF&, Data&>)))
- receiver(Data d, DEF, on_done_fn<DDFN...>) -> receiver<Data, passDVF, DEF, on_done_fn<DDFN...>>;
- PUSHMI_TEMPLATE(class Data, class DVF, class DEF, class DDF)
- (requires PUSHMI_EXP(
- lazy::True<> PUSHMI_AND
- lazy::ReceiverDataArg<Data>PUSHMI_AND
- lazy::Invocable<DDF&, Data&>))
- receiver(Data d, DVF vf, DEF ef, DDF df) -> receiver<Data, DVF, DEF, DDF>;
- #endif
- template<>
- struct construct_deduced<receiver> : make_receiver_fn {};
- PUSHMI_TEMPLATE (class T, class In)
- (requires SenderTo<In, std::promise<T>, is_single<>>)
- std::future<T> future_from(In in) {
- std::promise<T> p;
- auto result = p.get_future();
- submit(in, std::move(p));
- return result;
- }
- PUSHMI_TEMPLATE (class In)
- (requires SenderTo<In, std::promise<void>, is_single<>>)
- std::future<void> future_from(In in) {
- std::promise<void> p;
- auto result = p.get_future();
- submit(in, std::move(p));
- return result;
- }
- } // namespace pushmi
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