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on.hpp
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on.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/bind_back.hpp>
#include <unifex/scheduler_concepts.hpp>
#include <unifex/sender_concepts.hpp>
#include <unifex/sequence.hpp>
#include <unifex/tag_invoke.hpp>
#include <unifex/with_query_value.hpp>
#include <type_traits>
#include <unifex/detail/prologue.hpp>
namespace unifex {
namespace _on {
inline const struct _fn {
template(typename Scheduler, typename Sender) //
(requires sender<Sender> AND scheduler<Scheduler> AND
tag_invocable<_fn, Scheduler, Sender>) //
auto
operator()(Scheduler&& scheduler, Sender&& sender) const
noexcept(is_nothrow_tag_invocable_v<_fn, Scheduler, Sender>)
-> tag_invoke_result_t<_fn, Scheduler, Sender> {
return unifex::tag_invoke(
_fn{}, (Scheduler &&) scheduler, (Sender &&) sender);
}
template(typename Scheduler, typename Sender) //
(requires sender<Sender> AND
scheduler<Scheduler> AND(!tag_invocable<_fn, Scheduler, Sender>)) //
auto
operator()(Scheduler&& scheduler, Sender&& sender) const {
auto scheduleSender = schedule(scheduler);
return sequence(
std::move(scheduleSender),
with_query_value(
(Sender &&) sender, get_scheduler, (Scheduler &&) scheduler));
}
} on{};
} // namespace _on
using _on::on;
} // namespace unifex
#include <unifex/detail/epilogue.hpp>