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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.ConstBufferSequence"></a><a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">Constant buffer sequence
requirements</a>
</h3></div></div></div>
<p>
A <span class="emphasis"><em>constant buffer sequence</em></span> represents a set of memory
regions that may be used as input to an operation, such as the <code class="computeroutput"><span class="identifier">send</span></code> operation of a socket.
</p>
<p>
A type <code class="computeroutput"><span class="identifier">X</span></code> meets the <code class="computeroutput"><span class="identifier">ConstBufferSequence</span></code> requirements if it
satisfies the requirements of <code class="computeroutput"><span class="identifier">Destructible</span></code>
(C++Std [destructible]) and <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
(C++Std [copyconstructible]), as well as the additional requirements listed
below.
</p>
<p>
In the table below, <code class="computeroutput"><span class="identifier">x</span></code> denotes
a (possibly const) value of type <code class="computeroutput"><span class="identifier">X</span></code>,
and <code class="computeroutput"><span class="identifier">u</span></code> denotes an identifier.
</p>
<div class="table">
<a name="asio.reference.ConstBufferSequence.t0"></a><p class="title"><b>Table 11. ConstBufferSequence requirements</b></p>
<div class="table-contents"><table class="table" summary="ConstBufferSequence 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"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code><br>
<code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_end</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
An iterator type meeting the requirements for bidirectional iterators
(C++Std [bidirectional.iterators]) whose value type is convertible
to <code class="computeroutput"><span class="identifier">const_buffer</span></code>.
</p>
</td>
<td>
</td>
</tr>
<tr>
<td>
<pre class="programlisting"><span class="identifier">X</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">x</span><span class="special">);</span>
</pre>
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</td>
<td>
<p>
post:<br>
</p>
<pre class="programlisting"><span class="identifier">equal</span><span class="special">(</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">),</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_end</span><span class="special">(</span><span class="identifier">x</span><span class="special">),</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_begin</span><span class="special">(</span><span class="identifier">u</span><span class="special">),</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_end</span><span class="special">(</span><span class="identifier">u</span><span class="special">),</span>
<span class="special">[](</span><span class="keyword">const</span> <span class="identifier">const_buffer</span><span class="special">&</span> <span class="identifier">b1</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">const_buffer</span><span class="special">&</span> <span class="identifier">b2</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">b1</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">b2</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span>
<span class="special">&&</span> <span class="identifier">b1</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">b2</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span>
<span class="special">})</span>
</pre>
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<div class="copyright-footer">Copyright © 2003-2023 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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