libs/type_traits/doc/html/boost_typetraits/reference/type_identity.html

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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_typetraits.reference.type_identity"></a><a class="link" href="type_identity.html" title="type_identity">type_identity</a>
  28 </h3></div></div></div>
  29 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
  30 <span class="keyword">struct</span> <span class="identifier">type_identity</span>
  31 <span class="special">{</span>
  32    <span class="keyword">typedef</span> <span class="identifier">T</span> <span class="identifier">type</span><span class="special">;</span>
  33 <span class="special">};</span>
  34 </pre>
  35 <p>
  36         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
  37         <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">type_identity</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  38         or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  39       </p>
  40 <div class="table">
  41 <a name="boost_typetraits.reference.type_identity.examples"></a><p class="title"><b>Table&#160;1.34.&#160;Examples</b></p>
  42 <div class="table-contents"><table class="table" summary="Examples">
  43 <colgroup>
  44 <col>
  45 <col>
  46 </colgroup>
  47 <thead><tr>
  48 <th>
  49                 <p>
  50                   Expression
  51                 </p>
  52               </th>
  53 <th>
  54                 <p>
  55                   Result Type
  56                 </p>
  57               </th>
  58 </tr></thead>
  59 <tbody>
  60 <tr>
  61 <td>
  62                 <p>
  63                   <code class="computeroutput"><span class="identifier">type_identity</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
  64                 </p>
  65               </td>
  66 <td>
  67                 <p>
  68                   <code class="computeroutput"><span class="keyword">int</span></code>
  69                 </p>
  70               </td>
  71 </tr>
  72 <tr>
  73 <td>
  74                 <p>
  75                   <code class="computeroutput"><span class="identifier">type_identity</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
  76                 </p>
  77               </td>
  78 <td>
  79                 <p>
  80                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
  81                 </p>
  82               </td>
  83 </tr>
  84 <tr>
  85 <td>
  86                 <p>
  87                   <code class="computeroutput"><span class="identifier">type_identity</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">*</span> <span class="keyword">const</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
  88                 </p>
  89               </td>
  90 <td>
  91                 <p>
  92                   <code class="computeroutput"><span class="keyword">int</span><span class="special">*</span>
  93                   <span class="keyword">const</span><span class="special">&amp;</span></code>
  94                 </p>
  95               </td>
  96 </tr>
  97 </tbody>
  98 </table></div>
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