98 lines
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98 lines
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Legacy completion handler requirements</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="up" href="../reference.html" title="Reference">
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<link rel="prev" href="IteratorConnectToken.html" title="Iterator connect token requirements">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="IteratorConnectToken.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="MoveAcceptHandler.html"><img src="../../next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.LegacyCompletionHandler"></a><a class="link" href="LegacyCompletionHandler.html" title="Legacy completion handler requirements">Legacy completion
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handler requirements</a>
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</h3></div></div></div>
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<p>
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A legacy completion handler must meet the requirements for a <a class="link" href="Handler.html" title="Handlers">handler</a>.
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A legacy completion handler must meet the requirements of <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
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types (C++Std [copyconstructible]). A value <code class="computeroutput"><span class="identifier">h</span></code>
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of a completion handler class should work correctly in the expression <code class="computeroutput"><span class="identifier">h</span><span class="special">()</span></code>.
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</p>
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<h5>
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<a name="asio.reference.LegacyCompletionHandler.h0"></a>
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<span><a name="asio.reference.LegacyCompletionHandler.examples"></a></span><a class="link" href="LegacyCompletionHandler.html#asio.reference.LegacyCompletionHandler.examples">Examples</a>
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</h5>
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<p>
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A free function as a completion handler:
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</p>
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<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">completion_handler</span><span class="special">()</span>
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<span class="special">{</span>
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<span class="special">...</span>
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<span class="special">}</span>
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</pre>
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<p>
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A completion handler function object:
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</p>
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<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">completion_handler</span>
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<span class="special">{</span>
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<span class="special">...</span>
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<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()()</span>
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<span class="special">{</span>
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<span class="special">...</span>
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<span class="special">}</span>
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<span class="special">...</span>
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<span class="special">};</span>
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</pre>
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<p>
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A lambda as a completion handler:
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</p>
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<pre class="programlisting"><span class="identifier">my_io_service</span><span class="special">.</span><span class="identifier">post</span><span class="special">(</span>
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<span class="special">[]()</span>
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<span class="special">{</span>
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<span class="special">...</span>
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<span class="special">});</span>
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</pre>
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<p>
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A non-static class member function adapted to a completion handler using
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<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">bind</span><span class="special">()</span></code>:
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</p>
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<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">my_class</span><span class="special">::</span><span class="identifier">completion_handler</span><span class="special">()</span>
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<span class="special">{</span>
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<span class="special">...</span>
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<span class="special">}</span>
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<span class="special">...</span>
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<span class="identifier">my_io_service</span><span class="special">.</span><span class="identifier">post</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&</span><span class="identifier">my_class</span><span class="special">::</span><span class="identifier">completion_handler</span><span class="special">,</span> <span class="keyword">this</span><span class="special">));</span>
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</pre>
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<p>
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A non-static class member function adapted to a completion handler using
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<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">()</span></code>:
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</p>
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<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">my_class</span><span class="special">::</span><span class="identifier">completion_handler</span><span class="special">()</span>
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<span class="special">{</span>
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<span class="special">...</span>
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<span class="special">}</span>
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<span class="special">...</span>
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<span class="identifier">my_io_service</span><span class="special">.</span><span class="identifier">post</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&</span><span class="identifier">my_class</span><span class="special">::</span><span class="identifier">completion_handler</span><span class="special">,</span> <span class="keyword">this</span><span class="special">));</span>
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</pre>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher 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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</div>
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<hr>
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