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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>connect (2 of 8 overloads)</title> <link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../../boost_asio.html" title="Boost.Asio"> <link rel="up" href="../connect.html" title="connect"> <link rel="prev" href="overload1.html" title="connect (1 of 8 overloads)"> <link rel="next" href="overload3.html" title="connect (3 of 8 overloads)"> </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="overload1.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../connect.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="overload3.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="boost_asio.reference.connect.overload2"></a><a class="link" href="overload2.html" title="connect (2 of 8 overloads)">connect (2 of 8 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">&lt;</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="../SocketService.html" title="Socket service requirements">SocketService</a><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span> <span class="identifier">Iterator</span> <span class="identifier">connect</span><span class="special">(</span> <span class="identifier">basic_socket</span><span class="special">&lt;</span> <span class="identifier">Protocol</span><span class="special">,</span> <span class="identifier">SocketService</span> <span class="special">&gt;</span> <span class="special">&amp;</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">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</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="boost_asio.reference.connect.overload2.h0"></a> <span class="phrase"><a name="boost_asio.reference.connect.overload2.parameters"></a></span><a class="link" href="overload2.html#boost_asio.reference.connect.overload2.parameters">Parameters</a> </h6> <div class="variablelist"> <p class="title"><b></b></p> <dl class="variablelist"> <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">ec</span></dt> <dd><p> Set to indicate what error occurred, if any. If the sequence is empty, set to <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><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="boost_asio.reference.connect.overload2.h1"></a> <span class="phrase"><a name="boost_asio.reference.connect.overload2.return_value"></a></span><a class="link" href="overload2.html#boost_asio.reference.connect.overload2.return_value">Return Value</a> </h6> <p> On success, an iterator denoting the successfully connected endpoint. Otherwise, the end iterator. </p> <h6> <a name="boost_asio.reference.connect.overload2.h2"></a> <span class="phrase"><a name="boost_asio.reference.connect.overload2.remarks"></a></span><a class="link" href="overload2.html#boost_asio.reference.connect.overload2.remarks">Remarks</a> </h6> <p> This overload assumes that a default constructed object of type <code class="computeroutput"><span class="identifier">Iterator</span></code> represents the end of the sequence. This is a valid assumption for iterator types such as <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</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">iterator</span></code>. </p> <h6> <a name="boost_asio.reference.connect.overload2.h3"></a> <span class="phrase"><a name="boost_asio.reference.connect.overload2.example"></a></span><a class="link" href="overload2.html#boost_asio.reference.connect.overload2.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">io_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">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">socket</span> <span class="identifier">s</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">;</span> <span class="identifier">boost</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">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">ec</span><span class="special">);</span> <span class="keyword">if</span> <span class="special">(</span><span class="identifier">ec</span><span class="special">)</span> <span class="special">{</span> <span class="comment">// An error occurred.</span> <span class="special">}</span> </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 &#169; 2003-2014 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="overload1.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../connect.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="overload3.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>