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<title>Mutable buffer sequence requirements</title>
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<div class="section" title="Mutable buffer sequence requirements">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.MutableBufferSequence"></a><a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements"> Mutable
buffer sequence requirements</a>
</h3></div></div></div>
<p>
In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
a class containing objects of type <code class="computeroutput"><span class="identifier">T</span></code>,
<code class="computeroutput"><span class="identifier">a</span></code> denotes a 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="id631212"></a><p class="title"><b>Table 18. MutableBufferSequence requirements</b></p>
<div class="table-contents"><table class="table" summary="MutableBufferSequence 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">X</span><span class="special">::</span><span class="identifier">value_type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">T</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">T</span></code> meets the requirements
for <a class="link" href="ConvertibleToMutableBuffer.html" title="Convertible to mutable buffer requirements">ConvertibleToMutableBuffer</a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">const_iterator</span></code>
</p>
</td>
<td>
<p>
iterator type pointing to <code class="computeroutput"><span class="identifier">T</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">const_iterator</span></code> meets
the requirements for bidirectional iterators (C++ Std, 24.1.4).
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
post: <code class="computeroutput"><span class="identifier">equal_mutable_buffer_seq</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">X</span><span class="special">(</span><span class="identifier">a</span><span class="special">))</span></code> where the binary predicate <code class="computeroutput"><span class="identifier">equal_mutable_buffer_seq</span></code> is defined
as
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">equal_mutable_buffer_seq</span><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">&</span> <span class="identifier">x1</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">X</span><span class="special">&</span> <span class="identifier">x2</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span>
<span class="identifier">distance</span><span class="special">(</span><span class="identifier">x1</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">x1</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
<span class="special">==</span> <span class="identifier">distance</span><span class="special">(</span><span class="identifier">x2</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">x2</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
<span class="special">&&</span> <span class="identifier">equal</span><span class="special">(</span><span class="identifier">x1</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">x1</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span>
<span class="identifier">x2</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">equal_buffer</span><span class="special">);</span>
<span class="special">}</span>
</pre>
<p>
and the binary predicate <code class="computeroutput"><span class="identifier">equal_buffer</span></code>
is defined as
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">equal_buffer</span><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">&</span> <span class="identifier">v1</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">&</span> <span class="identifier">v2</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">b1</span><span class="special">(</span><span class="identifier">v1</span><span class="special">);</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">b2</span><span class="special">(</span><span class="identifier">v2</span><span class="special">);</span>
<span class="keyword">return</span>
<span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*>(</span><span class="identifier">b1</span><span class="special">)</span>
<span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*>(</span><span class="identifier">b2</span><span class="special">)</span>
<span class="special">&&</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">b1</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">b2</span><span class="special">);</span>
<span class="special">}</span>
</pre>
<p>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
post:
</p>
<pre class="programlisting"><span class="identifier">distance</span><span class="special">(</span><span class="identifier">a</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">a</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
<span class="special">==</span> <span class="identifier">distance</span><span class="special">(</span><span class="identifier">u</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">u</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
<span class="special">&&</span> <span class="identifier">equal</span><span class="special">(</span><span class="identifier">a</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">a</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span>
<span class="identifier">u</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">equal_buffer</span><span class="special">)</span>
</pre>
<p>
where the binary predicate <code class="computeroutput"><span class="identifier">equal_buffer</span></code>
is defined as
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">equal_buffer</span><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">&</span> <span class="identifier">v1</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">&</span> <span class="identifier">v2</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">b1</span><span class="special">(</span><span class="identifier">v1</span><span class="special">);</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">b2</span><span class="special">(</span><span class="identifier">v2</span><span class="special">);</span>
<span class="keyword">return</span>
<span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*>(</span><span class="identifier">b1</span><span class="special">)</span>
<span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*>(</span><span class="identifier">b2</span><span class="special">)</span>
<span class="special">&&</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">b1</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">b2</span><span class="special">);</span>
<span class="special">}</span>
</pre>
<p>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="special">(&</span><span class="identifier">a</span><span class="special">)->~</span><span class="identifier">X</span><span class="special">();</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">void</span></code>
</p>
</td>
<td>
<p>
note: the destructor is applied to every element of <code class="computeroutput"><span class="identifier">a</span></code>;
all the memory is deallocated.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">const_iterator</span></code> or convertible
to <code class="computeroutput"><span class="identifier">const_iterator</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">const_iterator</span></code> or convertible
to <code class="computeroutput"><span class="identifier">const_iterator</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 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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</tr></table>
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