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