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<title>Constant buffer sequence requirements</title>
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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>
        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="asio.reference.ConstBufferSequence.t0"></a><p class="title"><b>Table&#160;5.&#160;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">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="ConvertibleToConstBuffer.html" title="Convertible to const buffer requirements">ConvertibleToConstBuffer</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>
              </td>
<td>
                <p>
                  post: <code class="computeroutput"><span class="identifier">equal_const_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_const_buffer_seq</span></code> is defined
                  as
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">equal_const_buffer_seq</span><span class="special">(</span>
  <span class="keyword">const</span> <span class="identifier">X</span><span class="special">&amp;</span> <span class="identifier">x1</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">X</span><span class="special">&amp;</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">&amp;&amp;</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">&amp;</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">&amp;</span> <span class="identifier">v2</span><span class="special">)</span>
<span class="special">{</span>
  <span class="identifier">const_buffer</span> <span class="identifier">b1</span><span class="special">(</span><span class="identifier">v1</span><span class="special">);</span>
  <span class="identifier">const_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">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">b1</span><span class="special">)</span>
      <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">b2</span><span class="special">)</span>
        <span class="special">&amp;&amp;</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>
              </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">&amp;&amp;</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">&amp;</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">&amp;</span> <span class="identifier">v2</span><span class="special">)</span>
<span class="special">{</span>
  <span class="identifier">const_buffer</span> <span class="identifier">b1</span><span class="special">(</span><span class="identifier">v1</span><span class="special">);</span>
  <span class="identifier">const_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">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">b1</span><span class="special">)</span>
      <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">b2</span><span class="special">)</span>
        <span class="special">&amp;&amp;</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">(&amp;</span><span class="identifier">a</span><span class="special">)-&gt;~</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>
              </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>
              </td>
</tr>
</tbody>
</table></div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2014 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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