110 lines
2.2 KiB
Plaintext
110 lines
2.2 KiB
Plaintext
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/ Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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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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[section:SignalToken Signal token requirements]
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A signal token is a [link boost_asio.overview.model.completion_tokens completion
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token] for completion signature `void(error_code, int)`.
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[heading Examples]
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A free function as a signal token:
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void signal_handler(
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const boost::system::error_code& ec,
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int signal_number)
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{
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...
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}
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A signal token function object:
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struct signal_handler
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{
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...
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void operator()(
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const boost::system::error_code& ec,
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int signal_number)
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{
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...
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}
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...
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};
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A lambda as a signal token:
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signal_set.async_wait(...,
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[](const boost::system::error_code& ec,
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int signal_number)
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{
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...
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});
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A non-static class member function adapted to a signal token using
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`std::bind()`:
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void my_class::signal_handler(
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const boost::system::error_code& ec,
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int signal_number)
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{
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...
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}
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...
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signal_set.async_wait(...,
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std::bind(&my_class::signal_handler,
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this, std::placeholders::_1,
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std::placeholders::_2));
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A non-static class member function adapted to a signal token using
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`boost::bind()`:
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void my_class::signal_handler(
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const boost::system::error_code& ec,
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int signal_number)
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{
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...
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}
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...
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signal_set.async_wait(...,
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boost::bind(&my_class::signal_handler,
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this, boost::asio::placeholders::error,
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boost::asio::placeholders::signal_number));
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Using [link boost_asio.reference.use_future use_future] as a signal token:
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std::future<int> f = signal_set.async_wait(..., boost::asio::use_future);
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...
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try
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{
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int signo = f.get();
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...
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}
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catch (const system_error& e)
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{
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...
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}
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Using [link boost_asio.reference.use_awaitable use_awaitable] as a signal token:
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boost::asio::awaitable<void> my_coroutine()
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{
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try
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{
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...
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int signo =
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co_await signal_set.async_wait(
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..., boost::asio::use_awaitable);
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...
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}
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catch (const system_error& e)
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{
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...
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}
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}
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[endsect]
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