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  24 </div>
  25 <div class="section">
  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_asio.reference.ConvertibleToConstBuffer"></a><a class="link" href="ConvertibleToConstBuffer.html" title="Convertible to const buffer requirements">Convertible
  28       to const buffer requirements</a>
  29 </h3></div></div></div>
  30 <p>
  31         A type that meets the requirements for convertibility to a const buffer must
  32         meet the requirements of <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
  33         types (C++ Std, 20.1.3), and the requirements of <code class="computeroutput"><span class="identifier">Assignable</span></code>
  34         types (C++ Std, 23.1).
  35       </p>
  36 <p>
  37         In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
  38         a class meeting the requirements for convertibility to a const buffer, <code class="computeroutput"><span class="identifier">a</span></code> and <code class="computeroutput"><span class="identifier">b</span></code>
  39         denote values of type <code class="computeroutput"><span class="identifier">X</span></code>,
  40         and <code class="computeroutput"><span class="identifier">u</span></code>, <code class="computeroutput"><span class="identifier">v</span></code>
  41         and <code class="computeroutput"><span class="identifier">w</span></code> denote identifiers.
  42       </p>
  43 <div class="table">
  44 <a name="boost_asio.reference.ConvertibleToConstBuffer.t0"></a><p class="title"><b>Table&#160;6.&#160;ConvertibleToConstBuffer requirements</b></p>
  45 <div class="table-contents"><table class="table" summary="ConvertibleToConstBuffer requirements">
  46 <colgroup>
  47 <col>
  48 <col>
  49 </colgroup>
  50 <thead><tr>
  51 <th>
  52                 <p>
  53                   expression
  54                 </p>
  55               </th>
  56 <th>
  57                 <p>
  58                   postcondition
  59                 </p>
  60               </th>
  61 </tr></thead>
  62 <tbody>
  63 <tr>
  64 <td>
  65                 <p>
  66 </p>
  67 <pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
  68 <span class="identifier">const_buffer</span> <span class="identifier">v</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
  69 </pre>
  70 <p>
  71                 </p>
  72               </td>
  73 <td>
  74                 <p>
  75 </p>
  76 <pre class="programlisting"><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">u</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">v</span><span class="special">)</span>
  77   <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>
  78 </pre>
  79 <p>
  80                 </p>
  81               </td>
  82 </tr>
  83 <tr>
  84 <td>
  85                 <p>
  86 </p>
  87 <pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
  88 <span class="identifier">const_buffer</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
  89 </pre>
  90 <p>
  91                 </p>
  92               </td>
  93 <td>
  94                 <p>
  95 </p>
  96 <pre class="programlisting"><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">u</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">v</span><span class="special">)</span>
  97   <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>
  98 </pre>
  99 <p>
 100                 </p>
 101               </td>
 102 </tr>
 103 <tr>
 104 <td>
 105                 <p>
 106 </p>
 107 <pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
 108 <span class="identifier">const_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>
 109 </pre>
 110 <p>
 111                 </p>
 112               </td>
 113 <td>
 114                 <p>
 115 </p>
 116 <pre class="programlisting"><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">u</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">v</span><span class="special">)</span>
 117   <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>
 118 </pre>
 119 <p>
 120                 </p>
 121               </td>
 122 </tr>
 123 <tr>
 124 <td>
 125                 <p>
 126 </p>
 127 <pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
 128 <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>
 129 <span class="identifier">const_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
 130 </pre>
 131 <p>
 132                 </p>
 133               </td>
 134 <td>
 135                 <p>
 136 </p>
 137 <pre class="programlisting"><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">u</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">w</span><span class="special">)</span>
 138   <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>
 139 </pre>
 140 <p>
 141                 </p>
 142               </td>
 143 </tr>
 144 <tr>
 145 <td>
 146                 <p>
 147 </p>
 148 <pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
 149 <span class="identifier">X</span> <span class="identifier">v</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
 150 <span class="identifier">const_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
 151 </pre>
 152 <p>
 153                 </p>
 154               </td>
 155 <td>
 156                 <p>
 157 </p>
 158 <pre class="programlisting"><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">u</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">w</span><span class="special">)</span>
 159   <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>
 160 </pre>
 161 <p>
 162                 </p>
 163               </td>
 164 </tr>
 165 <tr>
 166 <td>
 167                 <p>
 168 </p>
 169 <pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
 170 <span class="identifier">X</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
 171 <span class="identifier">const_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
 172 </pre>
 173 <p>
 174                 </p>
 175               </td>
 176 <td>
 177                 <p>
 178 </p>
 179 <pre class="programlisting"><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">u</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">w</span><span class="special">)</span>
 180   <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>
 181 </pre>
 182 <p>
 183                 </p>
 184               </td>
 185 </tr>
 186 <tr>
 187 <td>
 188                 <p>
 189 </p>
 190 <pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
 191 <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>
 192 <span class="identifier">const_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
 193 </pre>
 194 <p>
 195                 </p>
 196               </td>
 197 <td>
 198                 <p>
 199 </p>
 200 <pre class="programlisting"><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">u</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">w</span><span class="special">)</span>
 201   <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>
 202 </pre>
 203 <p>
 204                 </p>
 205               </td>
 206 </tr>
 207 </tbody>
 208 </table></div>
 209 </div>
 210 <br class="table-break">
 211 </div>
 212 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 213 <td align="left"></td>
 214 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2012 Christopher M. Kohlhoff<p>
 215         Distributed under the Boost Software License, Version 1.0. (See accompanying
 216         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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