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119 lines
4.9 KiB
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<html>
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<title>Iterator connect handler requirements</title>
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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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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.IteratorConnectHandler"></a><a class="link" href="IteratorConnectHandler.html" title="Iterator connect handler requirements">Iterator connect
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handler requirements</a>
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</h3></div></div></div>
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<p>
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An iterator connect 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 an iterator connect handler class should work correctly
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in the expression <code class="computeroutput">h(ec, i)</code>, where <code class="computeroutput">ec</code> is an lvalue
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of type <code class="computeroutput">const error_code</code> and <code class="computeroutput">i</code> is an lvalue of
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the type <code class="computeroutput">Iterator</code> used in the corresponding <code class="computeroutput">connect()</code>
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or async_connect()` function.
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</p>
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<h5>
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<a name="asio.reference.IteratorConnectHandler.h0"></a>
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<span><a name="asio.reference.IteratorConnectHandler.examples"></a></span><a class="link" href="IteratorConnectHandler.html#asio.reference.IteratorConnectHandler.examples">Examples</a>
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</h5>
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<p>
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A free function as an iterator connect handler:
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</p>
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<pre class="programlisting">void connect_handler(
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const asio::error_code& ec,
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asio::ip::tcp::resolver::iterator iterator)
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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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An iterator connect handler function object:
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</p>
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<pre class="programlisting">struct connect_handler
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{
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...
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template <typename Iterator>
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void operator()(
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const asio::error_code& ec,
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Iterator iterator)
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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 an iterator connect handler:
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</p>
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<pre class="programlisting">asio::async_connect(...,
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[](const asio::error_code& ec,
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asio::ip::tcp::resolver::iterator iterator)
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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 an iterator connect handler
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using <code class="computeroutput">std::bind()</code>:
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</p>
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<pre class="programlisting">void my_class::connect_handler(
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const asio::error_code& ec,
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asio::ip::tcp::resolver::iterator iterator)
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{
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...
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}
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...
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asio::async_connect(...,
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std::bind(&my_class::connect_handler,
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this, std::placeholders::_1,
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std::placeholders::_2));
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</pre>
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<p>
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A non-static class member function adapted to an iterator connect handler
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using <code class="computeroutput">boost::bind()</code>:
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</p>
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<pre class="programlisting">void my_class::connect_handler(
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const asio::error_code& ec,
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asio::ip::tcp::resolver::iterator iterator)
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{
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...
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}
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...
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asio::async_connect(...,
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boost::bind(&my_class::connect_handler,
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this, asio::placeholders::error,
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asio::placeholders::iterator));
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</pre>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
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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></td>
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</tr></table>
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