116 lines
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116 lines
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<title>basic_socket::async_connect</title>
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<div class="titlepage"><div><div><h4 class="title">
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<a name="boost_asio.reference.basic_socket.async_connect"></a><a class="link" href="async_connect.html" title="basic_socket::async_connect">basic_socket::async_connect</a>
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</h4></div></div></div>
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<p>
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<a class="indexterm" name="boost_asio.indexterm.basic_socket.async_connect"></a>
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Start
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an asynchronous connect.
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</p>
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<pre class="programlisting">template<
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typename <a class="link" href="../ConnectHandler.html" title="Connect handler requirements">ConnectHandler</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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const endpoint_type & peer_endpoint,
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ConnectHandler && 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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</pre>
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<p>
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This function is used to asynchronously connect a socket to the specified
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remote endpoint. The function call always returns immediately.
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</p>
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<p>
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The socket is automatically opened if it is not already open. If the connect
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fails, and the socket was automatically opened, the socket is not returned
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to the closed state.
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</p>
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<h6>
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<a name="boost_asio.reference.basic_socket.async_connect.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.basic_socket.async_connect.parameters"></a></span><a class="link" href="async_connect.html#boost_asio.reference.basic_socket.async_connect.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">peer_endpoint</span></dt>
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<dd><p>
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The remote endpoint to which the socket will be connected. Copies
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will be made of the endpoint object as required.
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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 connection operation completes.
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Copies will be made of the handler as required. The function signature
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of the handler must be:
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</p>
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<pre class="programlisting">void handler(
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const boost::system::error_code& error // Result of operation
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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.basic_socket.async_connect.h1"></a>
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<span class="phrase"><a name="boost_asio.reference.basic_socket.async_connect.example"></a></span><a class="link" href="async_connect.html#boost_asio.reference.basic_socket.async_connect.example">Example</a>
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</h6>
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<pre class="programlisting">void connect_handler(const boost::system::error_code& error)
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{
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if (!error)
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{
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// Connect succeeded.
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}
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}
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...
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boost::asio::ip::tcp::socket socket(my_context);
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boost::asio::ip::tcp::endpoint endpoint(
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boost::asio::ip::address::from_string("1.2.3.4"), 12345);
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socket.async_connect(endpoint, connect_handler);
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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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