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+<title>Legacy completion handler requirements</title>
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+<div class="titlepage"><div><div><h3 class="title">
+<a name="boost_asio.reference.LegacyCompletionHandler"></a><a class="link" href="LegacyCompletionHandler.html" title="Legacy completion handler requirements">Legacy
+ completion handler requirements</a>
+</h3></div></div></div>
+<p>
+ A legacy completion handler must meet the requirements for a <a class="link" href="Handler.html" title="Handlers">handler</a>.
+ A legacy completion handler must meet the requirements of <code class="computeroutput">CopyConstructible</code>
+ types (C++Std [copyconstructible]). A value <code class="computeroutput">h</code> of a completion
+ handler class should work correctly in the expression <code class="computeroutput">h()</code>.
+ </p>
+<h5>
+<a name="boost_asio.reference.LegacyCompletionHandler.h0"></a>
+ <span class="phrase"><a name="boost_asio.reference.LegacyCompletionHandler.examples"></a></span><a class="link" href="LegacyCompletionHandler.html#boost_asio.reference.LegacyCompletionHandler.examples">Examples</a>
+ </h5>
+<p>
+ A free function as a completion handler:
+ </p>
+<pre class="programlisting">void completion_handler()
+{
+ ...
+}
+</pre>
+<p>
+ A completion handler function object:
+ </p>
+<pre class="programlisting">struct completion_handler
+{
+ ...
+ void operator()()
+ {
+ ...
+ }
+ ...
+};
+</pre>
+<p>
+ A lambda as a completion handler:
+ </p>
+<pre class="programlisting">my_io_service.post(
+ []()
+ {
+ ...
+ });
+</pre>
+<p>
+ A non-static class member function adapted to a completion handler using
+ <code class="computeroutput">std::bind()</code>:
+ </p>
+<pre class="programlisting">void my_class::completion_handler()
+{
+ ...
+}
+...
+my_io_service.post(std::bind(&amp;my_class::completion_handler, this));
+</pre>
+<p>
+ A non-static class member function adapted to a completion handler using
+ <code class="computeroutput">boost::bind()</code>:
+ </p>
+<pre class="programlisting">void my_class::completion_handler()
+{
+ ...
+}
+...
+my_io_service.post(boost::bind(&amp;my_class::completion_handler, this));
+</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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