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<title>Completion condition requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.CompletionCondition"></a><a class="link" href="CompletionCondition.html" title="Completion condition requirements">Completion
condition requirements</a>
</h3></div></div></div>
<p>
A <span class="emphasis"><em>completion condition</em></span> is a function object that is
used with the algorithms <a class="link" href="read.html" title="read"><code class="computeroutput">read</code></a>,
<a class="link" href="async_read.html" title="async_read"><code class="computeroutput">async_read</code></a>,
<a class="link" href="write.html" title="write"><code class="computeroutput">write</code></a>, and
<a class="link" href="async_write.html" title="async_write"><code class="computeroutput">async_write</code></a>
to determine when the algorithm has completed transferring data.
</p>
<p>
A type <code class="computeroutput">X</code> meets the <code class="computeroutput">CompletionCondition</code> requirements
if it satisfies the requirements of <code class="computeroutput">Destructible</code> (C++Std [destructible])
and <code class="computeroutput">CopyConstructible</code> (C++Std [copyconstructible]), as well
as the additional requirements listed below.
</p>
<p>
In the table below, <code class="computeroutput">x</code> denotes a value of type <code class="computeroutput">X</code>,
<code class="computeroutput">ec</code> denotes a (possibly const) value of type <code class="computeroutput">error_code</code>,
and <code class="computeroutput">n</code> denotes a (possibly const) value of type <code class="computeroutput">size_t</code>.
</p>
<div class="table">
<a name="boost_asio.reference.CompletionCondition.t0"></a><p class="title"><b>Table 6. CompletionCondition requirements</b></p>
<div class="table-contents"><table class="table" summary="CompletionCondition requirements">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
expression
</p>
</th>
<th>
<p>
return type
</p>
</th>
<th>
<p>
assertion/note<br> pre/post-condition
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput">x(ec, n)</code>
</p>
</td>
<td>
<p>
<code class="computeroutput">size_t</code>
</p>
</td>
<td>
<p>
Let <code class="computeroutput">n</code> be the total number of bytes transferred by
the read or write algorithm so far.<br> <br> Returns the maximum
number of bytes to be transferred on the next <code class="computeroutput">read_some</code>,
<code class="computeroutput">async_read_some</code>, <code class="computeroutput">write_some</code>, or <code class="computeroutput">async_write_some</code>
operation performed by the algorithm. Returns <code class="computeroutput">0</code> to
indicate that the algorithm is complete.
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<td align="right"><div class="copyright-footer">Copyright © 2003-2018 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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