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<title>basic_datagram_socket::async_send (1 of 2 overloads)</title>
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<div class="titlepage"><div><div><h5 class="title">
<a name="boost_asio.reference.basic_datagram_socket.async_send.overload1"></a><a class="link" href="overload1.html" title="basic_datagram_socket::async_send (1 of 2 overloads)">basic_datagram_socket::async_send
(1 of 2 overloads)</a>
</h5></div></div></div>
<p>
Start an asynchronous send on a connected socket.
</p>
<pre class="programlisting">template<
typename <a class="link" href="../../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
typename <a class="link" href="../../WriteHandler.html" title="Write handler requirements">WriteHandler</a>>
<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_send(
const ConstBufferSequence & buffers,
WriteHandler && handler);
</pre>
<p>
This function is used to asynchronously send data on the datagram socket.
The function call always returns immediately.
</p>
<h6>
<a name="boost_asio.reference.basic_datagram_socket.async_send.overload1.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_datagram_socket.async_send.overload1.parameters"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_datagram_socket.async_send.overload1.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">buffers</span></dt>
<dd><p>
One or more data buffers to be sent on the socket. Although the
buffers object may be copied as necessary, ownership of the underlying
memory blocks is retained by the caller, which must guarantee that
they remain valid until the handler is called.
</p></dd>
<dt><span class="term">handler</span></dt>
<dd>
<p>
The handler to be called when the send 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(
const boost::system::error_code& error, // Result of operation.
std::size_t bytes_transferred // Number of bytes sent.
);
</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>
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<h6>
<a name="boost_asio.reference.basic_datagram_socket.async_send.overload1.h1"></a>
<span class="phrase"><a name="boost_asio.reference.basic_datagram_socket.async_send.overload1.remarks"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_datagram_socket.async_send.overload1.remarks">Remarks</a>
</h6>
<p>
The async_send operation can only be used with a connected socket. Use
the async_send_to function to send data on an unconnected datagram socket.
</p>
<h6>
<a name="boost_asio.reference.basic_datagram_socket.async_send.overload1.h2"></a>
<span class="phrase"><a name="boost_asio.reference.basic_datagram_socket.async_send.overload1.example"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_datagram_socket.async_send.overload1.example">Example</a>
</h6>
<p>
To send a single data buffer use the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
function as follows:
</p>
<pre class="programlisting">socket.async_send(boost::asio::buffer(data, size), handler);
</pre>
<p>
See the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
documentation for information on sending multiple buffers in one go,
and how to use it with arrays, boost::array or std::vector.
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2019 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>)
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