<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Move accept handler requirements</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="../../boost_asio.html" title="Boost.Asio"> <link rel="up" href="../reference.html" title="Reference"> <link rel="prev" href="LegacyCompletionHandler.html" title="Legacy completion handler requirements"> <link rel="next" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td align="center"><a href="../../../../index.html">Home</a></td> <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="LegacyCompletionHandler.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="MutableBufferSequence.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="boost_asio.reference.MoveAcceptHandler"></a><a class="link" href="MoveAcceptHandler.html" title="Move accept handler requirements">Move accept handler requirements</a> </h3></div></div></div> <p> A move accept handler must meet the requirements for a <a class="link" href="Handler.html" title="Handlers">handler</a>. A value <code class="computeroutput">h</code> of a move accept handler class should work correctly in the expression <code class="computeroutput">h(ec, s)</code>, where <code class="computeroutput">ec</code> is an lvalue of type <code class="computeroutput">const error_code</code> and <code class="computeroutput">s</code> is an lvalue of the nested type <code class="computeroutput">Protocol::socket</code> for the type <code class="computeroutput">Protocol</code> of the socket class template. </p> <h5> <a name="boost_asio.reference.MoveAcceptHandler.h0"></a> <span class="phrase"><a name="boost_asio.reference.MoveAcceptHandler.examples"></a></span><a class="link" href="MoveAcceptHandler.html#boost_asio.reference.MoveAcceptHandler.examples">Examples</a> </h5> <p> A free function as a move accept handler: </p> <pre class="programlisting">void accept_handler( const boost::system::error_code& ec, boost::asio::ip::tcp::socket s) { ... } </pre> <p> A move accept handler function object: </p> <pre class="programlisting">struct accept_handler { ... void operator()( const boost::system::error_code& ec, boost::asio::ip::tcp::socket s) { ... } ... }; </pre> <p> A lambda as a move accept handler: </p> <pre class="programlisting">acceptor.async_accept(..., [](const boost::system::error_code& ec, boost::asio::ip::tcp::socket s) { ... }); </pre> <p> A non-static class member function adapted to a move accept handler using <code class="computeroutput">std::bind()</code>: </p> <pre class="programlisting">void my_class::accept_handler( const boost::system::error_code& ec, boost::asio::ip::tcp::socket socket) { ... } ... boost::asio::async_accept(..., std::bind(&my_class::accept_handler, this, std::placeholders::_1, std::placeholders::_2)); </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 © 2003-2021 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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="LegacyCompletionHandler.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="MutableBufferSequence.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>