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-<a name="boost_asio.reference.posix__stream_descriptor.async_wait"></a><a class="link" href="async_wait.html" title="posix::stream_descriptor::async_wait">posix::stream_descriptor::async_wait</a>
-</h4></div></div></div>
-<p>
- <span class="emphasis"><em>Inherited from posix::descriptor.</em></span>
- </p>
-<p>
- <a class="indexterm" name="boost_asio.indexterm.posix__stream_descriptor.async_wait"></a>
-Asynchronously
- wait for the descriptor to become ready to read, ready to write, or to
- have pending error conditions.
- </p>
-<pre class="programlisting">template&lt;
- typename <a class="link" href="../WaitHandler.html" title="Wait handler requirements">WaitHandler</a>&gt;
-<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(
- wait_type w,
- WaitHandler &amp;&amp; handler);
-</pre>
-<p>
- This function is used to perform an asynchronous wait for a descriptor
- to enter a ready to read, write or error condition state.
- </p>
-<h6>
-<a name="boost_asio.reference.posix__stream_descriptor.async_wait.h0"></a>
- <span class="phrase"><a name="boost_asio.reference.posix__stream_descriptor.async_wait.parameters"></a></span><a class="link" href="async_wait.html#boost_asio.reference.posix__stream_descriptor.async_wait.parameters">Parameters</a>
- </h6>
-<div class="variablelist">
-<p class="title"><b></b></p>
-<dl class="variablelist">
-<dt><span class="term">w</span></dt>
-<dd><p>
- Specifies the desired descriptor state.
- </p></dd>
-<dt><span class="term">handler</span></dt>
-<dd>
-<p>
- The handler to be called when the wait operation completes. Copies
- will be made of the handler as required. The function signature of
- the handler must be:
-</p>
-<pre class="programlisting">void handler(
- const boost::system::error_code&amp; error // Result of operation
-);
-</pre>
-<p>
- Regardless of whether the asynchronous operation completes immediately
- or not, the handler will not be invoked from within this function.
- Invocation of the handler will be performed in a manner equivalent
- to using <code class="computeroutput">boost::asio::io_context::post()</code>.
- </p>
-</dd>
-</dl>
-</div>
-<h6>
-<a name="boost_asio.reference.posix__stream_descriptor.async_wait.h1"></a>
- <span class="phrase"><a name="boost_asio.reference.posix__stream_descriptor.async_wait.example"></a></span><a class="link" href="async_wait.html#boost_asio.reference.posix__stream_descriptor.async_wait.example">Example</a>
- </h6>
-<pre class="programlisting">void wait_handler(const boost::system::error_code&amp; error)
-{
- if (!error)
- {
- // Wait succeeded.
- }
-}
-
-...
-
-boost::asio::posix::stream_descriptor descriptor(io_context);
-...
-descriptor.async_wait(
- boost::asio::posix::stream_descriptor::wait_read,
- wait_handler);
-</pre>
-</div>
-<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- 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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