113 lines
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113 lines
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.WaitHandler"></a><a class="link" href="WaitHandler.html" title="Wait handler requirements">Wait handler requirements</a>
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</h3></div></div></div>
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<p>
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A wait handler must meet the requirements for a <a class="link" href="Handler.html" title="Handlers">handler</a>.
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A value <code class="computeroutput">h</code> of a wait handler class should work correctly in the
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expression <code class="computeroutput">h(ec)</code>, where <code class="computeroutput">ec</code> is an lvalue of type
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<code class="computeroutput">const error_code</code>.
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<h5>
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<a name="boost_asio.reference.WaitHandler.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.WaitHandler.examples"></a></span><a class="link" href="WaitHandler.html#boost_asio.reference.WaitHandler.examples">Examples</a>
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</h5>
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<p>
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A free function as a wait handler:
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</p>
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<pre class="programlisting">void wait_handler(
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const boost::system::error_code& ec)
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{
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...
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}
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</pre>
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<p>
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A wait handler function object:
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</p>
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<pre class="programlisting">struct wait_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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{
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...
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}
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...
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};
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</pre>
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<p>
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A lambda as a wait handler:
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</p>
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<pre class="programlisting">socket.async_wait(...,
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[](const boost::system::error_code& ec)
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{
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...
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});
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</pre>
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<p>
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A non-static class member function adapted to a wait handler using <code class="computeroutput">std::bind()</code>:
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</p>
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<pre class="programlisting">void my_class::wait_handler(
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const boost::system::error_code& ec)
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{
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...
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}
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...
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socket.async_wait(...,
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std::bind(&my_class::wait_handler,
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this, std::placeholders::_1));
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</pre>
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<p>
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A non-static class member function adapted to a wait handler using <code class="computeroutput">boost::bind()</code>:
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</p>
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<pre class="programlisting">void my_class::wait_handler(
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const boost::system::error_code& ec)
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{
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...
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}
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...
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socket.async_wait(...,
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boost::bind(&my_class::wait_handler,
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this, boost::asio::placeholders::error));
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</pre>
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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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