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<title>Convertible to mutable buffer requirements</title>
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<div class="section" title="Convertible to mutable buffer requirements">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.ConvertibleToMutableBuffer"></a><a class="link" href="ConvertibleToMutableBuffer.html" title="Convertible to mutable buffer requirements"> Convertible
      to mutable buffer requirements</a>
</h3></div></div></div>
<p>
        A type that meets the requirements for convertibility to a mutable buffer
        must meet the requirements of <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
        types (C++ Std, 20.1.3), and the requirements of <code class="computeroutput"><span class="identifier">Assignable</span></code>
        types (C++ Std, 23.1).
      </p>
<p>
        In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
        a class meeting the requirements for convertibility to a mutable buffer,
        <code class="computeroutput"><span class="identifier">a</span></code> and <code class="computeroutput"><span class="identifier">b</span></code>
        denote values of type <code class="computeroutput"><span class="identifier">X</span></code>,
        and <code class="computeroutput"><span class="identifier">u</span></code>, <code class="computeroutput"><span class="identifier">v</span></code>
        and <code class="computeroutput"><span class="identifier">w</span></code> denote identifiers.
      </p>
<div class="table">
<a name="id620639"></a><p class="title"><b>Table&#160;7.&#160;ConvertibleToMutableBuffer requirements</b></p>
<div class="table-contents"><table class="table" summary="ConvertibleToMutableBuffer requirements">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
            <p>
              expression
            </p>
            </th>
<th>
            <p>
              postcondition
            </p>
            </th>
</tr></thead>
<tbody>
<tr>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">mutable_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">v</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
</pre>
<p>
            </p>
            </td>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">v</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span>
</pre>
<p>
            </p>
            </td>
</tr>
<tr>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">mutable_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
            </p>
            </td>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">v</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span>
</pre>
<p>
            </p>
            </td>
</tr>
<tr>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">mutable_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">v</span><span class="special">;</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
            </p>
            </td>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">v</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span>
</pre>
<p>
            </p>
            </td>
</tr>
<tr>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">mutable_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">&amp;</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
            </p>
            </td>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">w</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span>
</pre>
<p>
            </p>
            </td>
</tr>
<tr>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">mutable_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">X</span> <span class="identifier">v</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
            </p>
            </td>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">w</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span>
</pre>
<p>
            </p>
            </td>
</tr>
<tr>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">mutable_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">X</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
            </p>
            </td>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">w</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span>
</pre>
<p>
            </p>
            </td>
</tr>
<tr>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">mutable_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">X</span> <span class="identifier">v</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<span class="identifier">mutable_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
            </p>
            </td>
<td>
            <p>
              
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">w</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span>
</pre>
<p>
            </p>
            </td>
</tr>
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