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let_value_with_stop_token.hpp
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let_value_with_stop_token.hpp
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* Licensed under the Apache License Version 2.0 with LLVM Exceptions
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* https://llvm.org/LICENSE.txt
*
* 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.
*/
#pragma once
#include <unifex/config.hpp>
#include <unifex/execution_policy.hpp>
#include <unifex/fused_stop_source.hpp>
#include <unifex/inplace_stop_token.hpp>
#include <unifex/just.hpp>
#include <unifex/let_value.hpp>
#include <unifex/receiver_concepts.hpp>
#include <unifex/sender_concepts.hpp>
#include <unifex/type_list.hpp>
#include <unifex/detail/prologue.hpp>
namespace unifex {
namespace _let_v_w_stop_tok {
template <typename Operation, typename Receiver>
struct _stop_token_receiver {
class type;
};
template <typename SuccessorFactory, typename Receiver, typename = void>
struct _stop_token_operation {
struct type;
};
template <typename SuccessorFactory, typename Receiver>
using operation =
typename _stop_token_operation<SuccessorFactory, Receiver, void>::type;
template <typename Operation, typename Receiver>
using stop_token_receiver =
typename _stop_token_receiver<Operation, Receiver>::type;
template <typename Operation, typename Receiver>
class _stop_token_receiver<Operation, Receiver>::type {
public:
template <typename Receiver2>
explicit type(
Operation* op,
inplace_stop_token stop_token,
Receiver2&&
r) noexcept(std::is_nothrow_constructible_v<Receiver, Receiver2>)
: op_(op)
, stop_token_(stop_token)
, receiver_{static_cast<Receiver2&&>(r)} {}
template(typename... Values) //
(requires receiver_of<Receiver, Values...>) //
void set_value(Values&&... values) noexcept(
is_nothrow_receiver_of_v<Receiver, Values...>) {
cleanup();
unifex::set_value(std::move(receiver_), (Values &&) values...);
}
template(typename Error) //
(requires receiver<Receiver, Error>) //
void set_error(Error&& error) noexcept {
cleanup();
unifex::set_error(std::move(receiver_), (Error &&) error);
}
void set_done() noexcept {
cleanup();
unifex::set_done(std::move(receiver_));
}
friend inplace_stop_token
tag_invoke(tag_t<get_stop_token>, const type& r) noexcept {
return r.stop_token_;
}
template(typename CPO, typename Self) //
(requires is_receiver_query_cpo_v<CPO> //
AND same_as<Self, type>) //
friend auto tag_invoke(CPO cpo, const Self& self) noexcept(
std::is_nothrow_invocable_v<CPO, const Receiver&>)
-> std::invoke_result_t<CPO, const Receiver&> {
return cpo(self.receiver_);
}
template <typename VisitFunc>
friend void tag_invoke(
tag_t<visit_continuations>,
const type& r,
VisitFunc&&
func) noexcept(std::is_nothrow_invocable_v<VisitFunc&, const Receiver&>) {
func(r.receiver_);
}
private:
Operation* op_;
inplace_stop_token stop_token_;
UNIFEX_NO_UNIQUE_ADDRESS Receiver receiver_;
void cleanup() noexcept { op_->cleanup(); }
};
template <typename SuccessorFactory>
struct _stop_token_sender {
class type;
};
template <typename SuccessorFactory>
using stop_token_sender = typename _stop_token_sender<SuccessorFactory>::type;
template <typename SuccessorFactory>
class _stop_token_sender<SuccessorFactory>::type {
static_assert(
!std::is_reference_v<SuccessorFactory>,
"SuccessorFactory should be a value, not a reference");
public:
using inner_sender_t =
std::invoke_result_t<SuccessorFactory&, inplace_stop_token>;
template <
template <typename...>
class Variant,
template <typename...>
class Tuple>
using value_types = sender_value_types_t<inner_sender_t, Variant, Tuple>;
template <template <typename...> class Variant>
using error_types = sender_error_types_t<inner_sender_t, Variant>;
static constexpr bool sends_done = sender_traits<inner_sender_t>::sends_done;
static constexpr blocking_kind blocking =
sender_traits<inner_sender_t>::blocking;
static constexpr bool is_always_scheduler_affine =
sender_traits<inner_sender_t>::is_always_scheduler_affine;
template <typename SuccessorFactory2>
explicit type(SuccessorFactory2&& func) noexcept(
std::is_nothrow_constructible_v<SuccessorFactory, SuccessorFactory2&&>)
: func_((SuccessorFactory2 &&) func) {}
template(typename Self, typename Receiver) //
(requires same_as<remove_cvref_t<Self>, type> AND receiver<Receiver>) //
friend auto tag_invoke(
tag_t<unifex::connect>,
Self&& self,
Receiver&& r) noexcept(std::
is_nothrow_constructible_v<
operation<
SuccessorFactory,
unifex::remove_cvref_t<Receiver>>,
member_t<Self, SuccessorFactory>,
Receiver>)
-> operation<SuccessorFactory, unifex::remove_cvref_t<Receiver>> {
return operation<SuccessorFactory, unifex::remove_cvref_t<Receiver>>(
static_cast<Self&&>(self).func_, static_cast<Receiver&&>(r));
}
private:
UNIFEX_NO_UNIQUE_ADDRESS SuccessorFactory func_;
};
template <typename SuccessorFactory, typename Receiver>
struct _stop_token_operation<
SuccessorFactory,
Receiver,
std::enable_if_t<
std::is_same_v<stop_token_type_t<Receiver>, inplace_stop_token> ||
is_stop_never_possible_v<stop_token_type_t<Receiver>>>> {
static_assert(
!std::is_reference_v<SuccessorFactory>,
"SuccessorFactory should be a value, not a reference");
static_assert(
!std::is_reference_v<Receiver>,
"Receiver should be a value, not a reference");
struct type {
using inner_sender_t =
std::invoke_result_t<SuccessorFactory&, inplace_stop_token>;
using receiver_t =
stop_token_receiver<operation<SuccessorFactory, Receiver>, Receiver>;
static constexpr bool successor_is_nothrow =
std::is_nothrow_invocable_v<SuccessorFactory&, inplace_stop_token>;
template <typename Receiver2>
static constexpr bool inner_receiver_nothrow_constructible =
std::is_nothrow_constructible_v<
receiver_t,
type*,
inplace_stop_token,
Receiver2>;
static constexpr bool nothrow_connectable =
unifex::is_nothrow_connectable_v<inner_sender_t, receiver_t>;
private:
template <typename Receiver2>
auto connect_inner_op(
SuccessorFactory& func,
inplace_stop_token st,
// we need to take r by reference to avoid problems at the call site
// related to unsequenced function argument evaluation
Receiver2&& r) noexcept(successor_is_nothrow&&
inner_receiver_nothrow_constructible<
Receiver2>&& nothrow_connectable) {
return unifex::connect(
func(st), receiver_t{this, st, static_cast<Receiver2&&>(r)});
}
SuccessorFactory func_;
connect_result_t<inner_sender_t, receiver_t> innerOp_;
public:
template <typename Receiver2>
inplace_stop_token get_token(Receiver2& r) noexcept {
if constexpr (std::is_same_v<
stop_token_type_t<Receiver2>,
inplace_stop_token>) {
return get_stop_token(r);
} else {
return inplace_stop_token{};
}
}
template <typename SuccessorFactory2, typename Receiver2>
explicit type(SuccessorFactory2&& func, Receiver2&& r) noexcept(
std::is_nothrow_constructible_v<SuccessorFactory, SuccessorFactory2> //
&& std::is_nothrow_constructible_v<Receiver, Receiver2> //
&& noexcept(connect_inner_op(
func_, inplace_stop_token{}, static_cast<Receiver2&&>(r))))
: func_((SuccessorFactory2 &&) func)
, innerOp_(connect_inner_op(
func_, get_token(r), static_cast<Receiver2&&>(r))) {}
type(type&&) = delete;
~type() = default;
void start() noexcept { unifex::start(innerOp_); }
void cleanup() noexcept {}
};
};
template <typename SuccessorFactory, typename Receiver, typename AlwaysVoid>
struct _stop_token_operation<SuccessorFactory, Receiver, AlwaysVoid>::type {
static_assert(
!std::is_reference_v<SuccessorFactory>,
"SuccessorFactory should be a value, not a reference");
static_assert(
!std::is_reference_v<Receiver>,
"Receiver should be a value, not a reference");
using inner_sender_t =
std::invoke_result_t<SuccessorFactory&, inplace_stop_token>;
using receiver_t =
stop_token_receiver<operation<SuccessorFactory, Receiver>, Receiver>;
static constexpr bool successor_is_nothrow =
std::is_nothrow_invocable_v<SuccessorFactory&, inplace_stop_token>;
template <typename Receiver2>
static constexpr bool inner_receiver_nothrow_constructible =
std::is_nothrow_constructible_v<
receiver_t,
type*,
inplace_stop_token,
Receiver2>;
static constexpr bool nothrow_connectable =
unifex::is_nothrow_connectable_v<inner_sender_t, receiver_t>;
private:
template <typename Receiver2>
auto connect_inner_op(
SuccessorFactory& func,
inplace_stop_token st,
Receiver2&& r) noexcept(successor_is_nothrow&&
inner_receiver_nothrow_constructible<
Receiver2>&& nothrow_connectable) {
return unifex::connect(
func(st), receiver_t{this, st, static_cast<Receiver2&&>(r)});
}
SuccessorFactory func_;
using stop_token_type = stop_token_type_t<Receiver>;
stop_token_type receiverToken_;
fused_stop_source<stop_token_type> stopSource_;
connect_result_t<inner_sender_t, receiver_t> innerOp_;
public:
template <typename SuccessorFactory2, typename Receiver2>
explicit type(SuccessorFactory2&& func, Receiver2&& r) noexcept(
std::is_nothrow_constructible_v<SuccessorFactory, SuccessorFactory2> //
&& std::is_nothrow_constructible_v<Receiver, Receiver2> //
&& noexcept(connect_inner_op(
func_, inplace_stop_token{}, static_cast<Receiver2&&>(r))))
: func_((SuccessorFactory2 &&) func)
, receiverToken_(get_stop_token(r))
, innerOp_(connect_inner_op(
func_, stopSource_.get_token(), static_cast<Receiver2&&>(r))) {}
type(type&&) = delete;
~type() = default;
void start() noexcept {
stopSource_.register_callbacks(receiverToken_);
unifex::start(innerOp_);
}
void cleanup() noexcept { stopSource_.deregister_callbacks(); }
};
namespace _cpo {
struct _fn {
template <typename SuccessorFactory>
auto operator()(SuccessorFactory&& factory) const
noexcept(std::is_nothrow_constructible_v<
stop_token_sender<std::decay_t<SuccessorFactory>>,
SuccessorFactory>)
-> stop_token_sender<std::decay_t<SuccessorFactory>> {
return stop_token_sender<std::decay_t<SuccessorFactory>>{
static_cast<SuccessorFactory&&>(factory)};
}
};
} // namespace _cpo
} // namespace _let_v_w_stop_tok
inline constexpr _let_v_w_stop_tok::_cpo::_fn let_value_with_stop_token{};
} // namespace unifex
#include <unifex/detail/epilogue.hpp>