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143 lines
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<title>async_connect (1 of 6 overloads)</title>
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<div class="titlepage"><div><div><h4 class="title">
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<a name="boost_asio.reference.async_connect.overload1"></a><a class="link" href="overload1.html" title="async_connect (1 of 6 overloads)">async_connect
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(1 of 6 overloads)</a>
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</h4></div></div></div>
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<p>
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Asynchronously establishes a socket connection by trying each endpoint
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in a sequence.
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</p>
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<pre class="programlisting">template<
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typename <a class="link" href="../Protocol.html" title="Protocol requirements">Protocol</a>,
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typename <a class="link" href="../Executor1.html" title="Executor requirements">Executor</a>,
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typename <a class="link" href="../EndpointSequence.html" title="Endpoint sequence requirements">EndpointSequence</a>,
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typename <a class="link" href="../RangeConnectHandler.html" title="Range connect handler requirements">RangeConnectHandler</a> = <a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>>
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<a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_connect(
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basic_socket< Protocol, Executor > & s,
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const EndpointSequence & endpoints,
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RangeConnectHandler && handler = <a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
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typename constraint< is_endpoint_sequence< EndpointSequence >::value >::type = 0);
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</pre>
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<p>
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This function attempts to connect a socket to one of a sequence of endpoints.
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It does this by repeated calls to the socket's <code class="computeroutput">async_connect</code>
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member function, once for each endpoint in the sequence, until a connection
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is successfully established.
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</p>
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<h6>
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<a name="boost_asio.reference.async_connect.overload1.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.async_connect.overload1.parameters"></a></span><a class="link" href="overload1.html#boost_asio.reference.async_connect.overload1.parameters">Parameters</a>
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</h6>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl class="variablelist">
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<dt><span class="term">s</span></dt>
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<dd><p>
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The socket to be connected. If the socket is already open, it will
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be closed.
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</p></dd>
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<dt><span class="term">endpoints</span></dt>
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<dd><p>
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A sequence of endpoints.
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</p></dd>
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<dt><span class="term">handler</span></dt>
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<dd>
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<p>
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The handler to be called when the connect operation completes. Copies
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will be made of the handler as required. The function signature of
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the handler must be:
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</p>
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<pre class="programlisting">void handler(
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// Result of operation. if the sequence is empty, set to
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// boost::asio::error::not_found. Otherwise, contains the
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// error from the last connection attempt.
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const boost::system::error_code& error,
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// On success, the successfully connected endpoint.
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// Otherwise, a default-constructed endpoint.
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const typename Protocol::endpoint& endpoint
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);
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</pre>
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<p>
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Regardless of whether the asynchronous operation completes immediately
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or not, the handler will not be invoked from within this function.
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On immediate completion, invocation of the handler will be performed
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in a manner equivalent to using <a class="link" href="../post.html" title="post"><code class="computeroutput">post</code></a>.
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</p>
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</dd>
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</dl>
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</div>
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<h6>
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<a name="boost_asio.reference.async_connect.overload1.h1"></a>
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<span class="phrase"><a name="boost_asio.reference.async_connect.overload1.example"></a></span><a class="link" href="overload1.html#boost_asio.reference.async_connect.overload1.example">Example</a>
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</h6>
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<pre class="programlisting">tcp::resolver r(my_context);
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tcp::resolver::query q("host", "service");
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tcp::socket s(my_context);
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// ...
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r.async_resolve(q, resolve_handler);
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// ...
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void resolve_handler(
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const boost::system::error_code& ec,
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tcp::resolver::results_type results)
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{
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if (!ec)
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{
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boost::asio::async_connect(s, results, connect_handler);
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}
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}
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// ...
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void connect_handler(
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const boost::system::error_code& ec,
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const tcp::endpoint& endpoint)
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{
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// ...
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}
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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 © 2003-2021 Christopher
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M. 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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