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<title>Buffer-oriented synchronous write stream requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.SyncWriteStream"></a><a class="link" href="SyncWriteStream.html" title="Buffer-oriented synchronous write stream requirements">Buffer-oriented
synchronous write stream requirements</a>
</h3></div></div></div>
<p>
A type <code class="computeroutput">X</code> meets the <code class="computeroutput">SyncWriteStream</code> requirements
if it satisfies the requirements listed below.
</p>
<p>
In the table below, <code class="computeroutput">a</code> denotes a value of type <code class="computeroutput">X</code>,
<code class="computeroutput">cb</code> denotes a (possibly const) value satisfying the <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements"><code class="computeroutput">ConstBufferSequence</code></a>
requirements, and <code class="computeroutput">ec</code> denotes an object of type <code class="computeroutput">error_code</code>.
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<a name="boost_asio.reference.SyncWriteStream.t0"></a><p class="title"><b>Table 30. SyncWriteStream requirements</b></p>
<div class="table-contents"><table class="table" summary="SyncWriteStream requirements">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
operation
</p>
</th>
<th>
<p>
type
</p>
</th>
<th>
<p>
semantics, pre/post-conditions
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput">a.write_some(cb)</code><br> <code class="computeroutput">a.write_some(cb,ec)</code>
</p>
</td>
<td>
<p>
<code class="computeroutput">size_t</code>
</p>
</td>
<td>
<p>
Meets the requirements for a <a class="link" href="read_write_operations.html" title="Requirements on read and write operations">write
operation</a>.<br> <br> If <code class="computeroutput">buffer_size(cb) > 0</code>,
writes one or more bytes of data to the stream <code class="computeroutput">a</code> from
the buffer sequence <code class="computeroutput">cb</code>. If successful, sets <code class="computeroutput">ec</code>
such that <code class="computeroutput">!ec</code> is <code class="computeroutput">true</code>, and returns the
number of bytes written. If an error occurred, sets <code class="computeroutput">ec</code>
such that <code class="computeroutput">!!ec</code> is <code class="computeroutput">true</code>, and returns 0.<br>
<br> If <code class="computeroutput">buffer_size(cb) == 0</code>, the operation shall
not block. Sets <code class="computeroutput">ec</code> such that <code class="computeroutput">!ec</code> is
<code class="computeroutput">true</code>, and returns 0.
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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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