<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>async_connect (2 of 6 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="../async_connect.html" title="async_connect"> <link rel="prev" href="overload1.html" title="async_connect (1 of 6 overloads)"> <link rel="next" href="overload3.html" title="async_connect (3 of 6 overloads)"> </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="overload1.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../async_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="overload3.html"><img src="../../../next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="asio.reference.async_connect.overload2"></a><a class="link" href="overload2.html" title="async_connect (2 of 6 overloads)">async_connect (2 of 6 overloads)</a> </h4></div></div></div> <p> (Deprecated: Use range overload.) Asynchronously establishes a socket connection by trying each endpoint in a sequence. </p> <pre class="programlisting">template< typename <a class="link" href="../Protocol.html" title="Protocol requirements">Protocol</a>, typename <a class="link" href="../Executor1.html" title="Executor requirements">Executor</a>, typename Iterator, typename <a class="link" href="../IteratorConnectHandler.html" title="Iterator connect handler requirements">IteratorConnectHandler</a> = <a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>> <a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_connect( basic_socket< Protocol, Executor > & s, Iterator begin, IteratorConnectHandler && handler = <a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>, typename enable_if<!is_endpoint_sequence< Iterator >::value >::type * = 0); </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">async_connect</code> member function, once for each endpoint in the sequence, until a connection is successfully established. </p> <h6> <a name="asio.reference.async_connect.overload2.h0"></a> <span><a name="asio.reference.async_connect.overload2.parameters"></a></span><a class="link" href="overload2.html#asio.reference.async_connect.overload2.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">handler</span></dt> <dd> <p> The handler to be called when the connect operation completes. Copies will be made of the handler as required. The function signature of the handler must be: </p> <pre class="programlisting">void handler( // Result of operation. if the sequence is empty, set to // asio::error::not_found. Otherwise, contains the // error from the last connection attempt. const asio::error_code& error, // On success, an iterator denoting the successfully // connected endpoint. Otherwise, the end iterator. Iterator iterator ); </pre> <p> Regardless of whether the asynchronous operation completes immediately or not, the handler will not be invoked from within this function. On immediate completion, invocation of the handler will be performed in a manner equivalent to using <a class="link" href="../post.html" title="post"><code class="computeroutput">post</code></a>. </p> </dd> </dl> </div> <h6> <a name="asio.reference.async_connect.overload2.h1"></a> <span><a name="asio.reference.async_connect.overload2.remarks"></a></span><a class="link" href="overload2.html#asio.reference.async_connect.overload2.remarks">Remarks</a> </h6> <p> This overload assumes that a default constructed object of type <code class="computeroutput">Iterator</code> represents the end of the sequence. This is a valid assumption for iterator types such as <code class="computeroutput">asio::ip::tcp::resolver::iterator</code>. </p> </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 © 2003-2020 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="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../async_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="overload3.html"><img src="../../../next.png" alt="Next"></a> </div> </body> </html>