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109 lines
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<title>Buffer-oriented synchronous write stream requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.SyncWriteStream"></a><a class="link" href="SyncWriteStream.html" title="Buffer-oriented synchronous write stream requirements">Buffer-oriented
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synchronous write stream requirements</a>
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</h3></div></div></div>
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<p>
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A type <code class="computeroutput">X</code> meets the <code class="computeroutput">SyncWriteStream</code> requirements
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if it satisfies the requirements listed below.
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</p>
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<p>
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In the table below, <code class="computeroutput">a</code> denotes a value of type <code class="computeroutput">X</code>,
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<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>
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requirements, and <code class="computeroutput">ec</code> denotes an object of type <code class="computeroutput">error_code</code>.
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</p>
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<div class="table">
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<a name="boost_asio.reference.SyncWriteStream.t0"></a><p class="title"><b>Table 31. SyncWriteStream requirements</b></p>
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<div class="table-contents"><table class="table" summary="SyncWriteStream requirements">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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operation
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</p>
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</th>
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<th>
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<p>
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type
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</p>
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</th>
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<th>
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<p>
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semantics, pre/post-conditions
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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<code class="computeroutput">a.write_some(cb)</code><br> <code class="computeroutput">a.write_some(cb,ec)</code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput">size_t</code>
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</p>
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</td>
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<td>
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<p>
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Meets the requirements for a <a class="link" href="read_write_operations.html" title="Requirements on read and write operations">write
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operation</a>.<br> <br> If <code class="computeroutput">buffer_size(cb) > 0</code>,
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writes one or more bytes of data to the stream <code class="computeroutput">a</code> from
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the buffer sequence <code class="computeroutput">cb</code>. If successful, sets <code class="computeroutput">ec</code>
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such that <code class="computeroutput">!ec</code> is <code class="computeroutput">true</code>, and returns the
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number of bytes written. If an error occurred, sets <code class="computeroutput">ec</code>
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such that <code class="computeroutput">!!ec</code> is <code class="computeroutput">true</code>, and returns 0.<br>
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<br> If <code class="computeroutput">buffer_size(cb) == 0</code>, the operation shall
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not block. Sets <code class="computeroutput">ec</code> such that <code class="computeroutput">!ec</code> is
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<code class="computeroutput">true</code>, and returns 0.
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</p>
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</td>
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</tr></tbody>
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</table></div>
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</div>
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<br class="table-break">
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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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