46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
//
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// Copyright (c) 2022 Klemens Morgenstern (klemens.morgenstern@gmx.net)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_COBALT_DETAIL_FORWARD_CANCELLATION_HPP
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#define BOOST_COBALT_DETAIL_FORWARD_CANCELLATION_HPP
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#include <boost/cobalt/config.hpp>
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#include <boost/asio/cancellation_signal.hpp>
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#include <boost/asio/dispatch.hpp>
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namespace boost::cobalt
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{
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// Requests cancellation where a successful cancellation results
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// in no apparent side effects and where the op can re-awaited.
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template<typename Awaitable>
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concept interruptible =
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( std::is_rvalue_reference_v<Awaitable> && requires (Awaitable && t) {std::move(t).interrupt_await();})
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|| (!std::is_rvalue_reference_v<Awaitable> && requires (Awaitable t) {t.interrupt_await();});
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}
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namespace boost::cobalt::detail
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{
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struct forward_cancellation
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{
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asio::cancellation_signal &cancel_signal;
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forward_cancellation(asio::cancellation_signal &cancel_signal) : cancel_signal(cancel_signal) {}
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void operator()(asio::cancellation_type ct) const
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{
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cancel_signal.emit(ct);
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}
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};
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}
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#endif //BOOST_COBALT_DETAIL_FORWARD_CANCELLATION_HPP
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