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110 lines
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<title>basic_socket::async_wait</title>
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<div class="titlepage"><div><div><h4 class="title">
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<a name="boost_asio.reference.basic_socket.async_wait"></a><a class="link" href="async_wait.html" title="basic_socket::async_wait">basic_socket::async_wait</a>
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</h4></div></div></div>
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<p>
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<a class="indexterm" name="boost_asio.indexterm.basic_socket.async_wait"></a>
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Asynchronously
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wait for the socket to become ready to read, ready to write, or to have
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pending error conditions.
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</p>
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<pre class="programlisting">template<
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typename <a class="link" href="../WaitHandler.html" title="Wait handler requirements">WaitHandler</a> = <a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>>
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<a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_wait(
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wait_type w,
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WaitHandler && handler = <a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>);
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</pre>
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<p>
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This function is used to perform an asynchronous wait for a socket to enter
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a ready to read, write or error condition state.
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</p>
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<h6>
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<a name="boost_asio.reference.basic_socket.async_wait.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.basic_socket.async_wait.parameters"></a></span><a class="link" href="async_wait.html#boost_asio.reference.basic_socket.async_wait.parameters">Parameters</a>
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</h6>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl class="variablelist">
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<dt><span class="term">w</span></dt>
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<dd><p>
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Specifies the desired socket state.
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</p></dd>
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<dt><span class="term">handler</span></dt>
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<dd>
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<p>
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The handler to be called when the wait operation completes. Copies
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will be made of the handler as required. The function signature of
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the handler must be:
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</p>
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<pre class="programlisting">void handler(
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const boost::system::error_code& error // Result of operation
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);
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</pre>
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<p>
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Regardless of whether the asynchronous operation completes immediately
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or not, the handler will not be invoked from within this function.
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On immediate completion, invocation of the handler will be performed
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in a manner equivalent to using <a class="link" href="../post.html" title="post"><code class="computeroutput">post</code></a>.
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</p>
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</dd>
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</dl>
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</div>
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<h6>
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<a name="boost_asio.reference.basic_socket.async_wait.h1"></a>
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<span class="phrase"><a name="boost_asio.reference.basic_socket.async_wait.example"></a></span><a class="link" href="async_wait.html#boost_asio.reference.basic_socket.async_wait.example">Example</a>
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</h6>
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<pre class="programlisting">void wait_handler(const boost::system::error_code& error)
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{
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if (!error)
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{
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// Wait succeeded.
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}
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}
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...
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boost::asio::ip::tcp::socket socket(my_context);
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...
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socket.async_wait(boost::asio::ip::tcp::socket::wait_read, wait_handler);
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</pre>
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</div>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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M. Kohlhoff<p>
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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 <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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