<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>connect (5 of 12 overloads)</title> <link rel="stylesheet" href="../../../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../../index.html" title="Asio"> <link rel="up" href="../connect.html" title="connect"> <link rel="prev" href="overload4.html" title="connect (4 of 12 overloads)"> <link rel="next" href="overload6.html" title="connect (6 of 12 overloads)"> <meta name="viewport" content="width=device-width, initial-scale=1"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="overload4.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../connect.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="overload6.html"><img src="../../../next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="asio.reference.connect.overload5"></a><a class="link" href="overload5.html" title="connect (5 of 12 overloads)">connect (5 of 12 overloads)</a> </h4></div></div></div> <p> Establishes a socket connection by trying each endpoint in a sequence. </p> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <a class="link" href="../Protocol.html" title="Protocol requirements">Protocol</a><span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../Executor1.html" title="Executor requirements">Executor</a><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">></span> <span class="identifier">Iterator</span> <span class="identifier">connect</span><span class="special">(</span> <span class="identifier">basic_socket</span><span class="special"><</span> <span class="identifier">Protocol</span><span class="special">,</span> <span class="identifier">Executor</span> <span class="special">></span> <span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">begin</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">end</span><span class="special">);</span> </pre> <p> This function attempts to connect a socket to one of a sequence of endpoints. It does this by repeated calls to the socket's <code class="computeroutput"><span class="identifier">connect</span></code> member function, once for each endpoint in the sequence, until a connection is successfully established. </p> <h6> <a name="asio.reference.connect.overload5.h0"></a> <span><a name="asio.reference.connect.overload5.parameters"></a></span><a class="link" href="overload5.html#asio.reference.connect.overload5.parameters">Parameters</a> </h6> <div class="variablelist"> <p class="title"><b></b></p> <dl> <dt><span class="term">s</span></dt> <dd><p> The socket to be connected. If the socket is already open, it will be closed. </p></dd> <dt><span class="term">begin</span></dt> <dd><p> An iterator pointing to the start of a sequence of endpoints. </p></dd> <dt><span class="term">end</span></dt> <dd><p> An iterator pointing to the end of a sequence of endpoints. </p></dd> </dl> </div> <h6> <a name="asio.reference.connect.overload5.h1"></a> <span><a name="asio.reference.connect.overload5.return_value"></a></span><a class="link" href="overload5.html#asio.reference.connect.overload5.return_value">Return Value</a> </h6> <p> An iterator denoting the successfully connected endpoint. </p> <h6> <a name="asio.reference.connect.overload5.h2"></a> <span><a name="asio.reference.connect.overload5.exceptions"></a></span><a class="link" href="overload5.html#asio.reference.connect.overload5.exceptions">Exceptions</a> </h6> <div class="variablelist"> <p class="title"><b></b></p> <dl> <dt><span class="term">asio::system_error</span></dt> <dd><p> Thrown on failure. If the sequence is empty, the associated <code class="computeroutput"><span class="identifier">error_code</span></code> is <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">not_found</span></code>. Otherwise, contains the error from the last connection attempt. </p></dd> </dl> </div> <h6> <a name="asio.reference.connect.overload5.h3"></a> <span><a name="asio.reference.connect.overload5.example"></a></span><a class="link" href="overload5.html#asio.reference.connect.overload5.example">Example</a> </h6> <pre class="programlisting"><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span> <span class="identifier">r</span><span class="special">(</span><span class="identifier">my_context</span><span class="special">);</span> <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">query</span> <span class="identifier">q</span><span class="special">(</span><span class="string">"host"</span><span class="special">,</span> <span class="string">"service"</span><span class="special">);</span> <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">results_type</span> <span class="identifier">e</span> <span class="special">=</span> <span class="identifier">r</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">q</span><span class="special">);</span> <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">s</span><span class="special">(</span><span class="identifier">my_context</span><span class="special">);</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> </pre> </div> <div class="copyright-footer">Copyright © 2003-2023 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> <hr> <div class="spirit-nav"> <a accesskey="p" href="overload4.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../connect.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="overload6.html"><img src="../../../next.png" alt="Next"></a> </div> </body> </html>