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<a name="asio.reference.basic_datagram_socket.async_send.overload2"></a><a class="link" href="overload2.html" title="basic_datagram_socket::async_send (2 of 2 overloads)">
basic_datagram_socket::async_send (2 of 2 overloads)</a>
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<p>
Start an asynchronous send on a connected socket.
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="../../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="../../WriteHandler.html" title="Write handler requirements">WriteHandler</a><span class="special">></span>
<span class="keyword">void</span> <span class="identifier">async_send</span><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
<span class="identifier">socket_base</span><span class="special">::</span><span class="identifier">message_flags</span> <span class="identifier">flags</span><span class="special">,</span>
<span class="identifier">WriteHandler</span> <span class="identifier">handler</span><span class="special">);</span>
</pre>
<p>
This function is used to send data on the datagram socket. The function
call will block until the data has been sent successfully or an error
occurs.
</p>
<a name="asio.reference.basic_datagram_socket.async_send.overload2.parameters"></a><h6>
<a name="id604627"></a>
<a class="link" href="overload2.html#asio.reference.basic_datagram_socket.async_send.overload2.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<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">flags</span></dt>
<dd><p>
Flags specifying how the send call is to be made.
</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"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&</span> <span class="identifier">error</span><span class="special">,</span> <span class="comment">// Result of operation.
</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_transferred</span> <span class="comment">// Number of bytes sent.
</span><span class="special">);</span>
</pre>
<p>
Regardless of whether the asynchronous operation completes immediately
or not, the handler will not be invoked from within this function.
Invocation of the handler will be performed in a manner equivalent
to using <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span><span class="special">::</span><span class="identifier">post</span><span class="special">()</span></code>.
</p>
</dd>
</dl>
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<a name="asio.reference.basic_datagram_socket.async_send.overload2.remarks"></a><h6>
<a name="id604823"></a>
<a class="link" href="overload2.html#asio.reference.basic_datagram_socket.async_send.overload2.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>
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<td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 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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