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+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="boost_asio.reference.posix__stream_descriptor.async_write_some"></a><a class="link" href="async_write_some.html" title="posix::stream_descriptor::async_write_some">posix::stream_descriptor::async_write_some</a>
+</h4></div></div></div>
+<p>
+ <a class="indexterm" name="boost_asio.indexterm.posix__stream_descriptor.async_write_some"></a>
+Start
+ an asynchronous write.
+ </p>
+<pre class="programlisting">template&lt;
+ 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>&gt;
+<a class="link" href="../asynchronous_operations/automatic_deduction_of_initiating_function_return_type.html" title="Automatic deduction of initiating function return type"><span class="emphasis"><em>DEDUCED</em></span></a> async_write_some(
+ const ConstBufferSequence &amp; buffers,
+ WriteHandler &amp;&amp; handler);
+</pre>
+<p>
+ This function is used to asynchronously write data to the stream descriptor.
+ The function call always returns immediately.
+ </p>
+<h6>
+<a name="boost_asio.reference.posix__stream_descriptor.async_write_some.h0"></a>
+ <span class="phrase"><a name="boost_asio.reference.posix__stream_descriptor.async_write_some.parameters"></a></span><a class="link" href="async_write_some.html#boost_asio.reference.posix__stream_descriptor.async_write_some.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 written to the descriptor. 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 write 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&amp; error, // Result of operation.
+ std::size_t bytes_transferred // Number of bytes written.
+);
+</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">boost::asio::io_context::post()</code>.
+ </p>
+</dd>
+</dl>
+</div>
+<h6>
+<a name="boost_asio.reference.posix__stream_descriptor.async_write_some.h1"></a>
+ <span class="phrase"><a name="boost_asio.reference.posix__stream_descriptor.async_write_some.remarks"></a></span><a class="link" href="async_write_some.html#boost_asio.reference.posix__stream_descriptor.async_write_some.remarks">Remarks</a>
+ </h6>
+<p>
+ The write operation may not transmit all of the data to the peer. Consider
+ using the <a class="link" href="../async_write.html" title="async_write"><code class="computeroutput">async_write</code></a>
+ function if you need to ensure that all data is written before the asynchronous
+ operation completes.
+ </p>
+<h6>
+<a name="boost_asio.reference.posix__stream_descriptor.async_write_some.h2"></a>
+ <span class="phrase"><a name="boost_asio.reference.posix__stream_descriptor.async_write_some.example"></a></span><a class="link" href="async_write_some.html#boost_asio.reference.posix__stream_descriptor.async_write_some.example">Example</a>
+ </h6>
+<p>
+ To write 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">descriptor.async_write_some(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 writing multiple buffers in one go, and
+ how to use it with arrays, boost::array or std::vector.
+ </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 &#169; 2003-2017 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>
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