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

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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_typetraits.reference.add_pointer"></a><a class="link" href="add_pointer.html" title="add_pointer">add_pointer</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">add_pointer</span>
  31 <span class="special">{</span>
  32    <span class="keyword">typedef</span> <em class="replaceable"><code>see-below</code></em> <span class="identifier">type</span><span class="special">;</span>
  33 <span class="special">};</span>
  34 </pre>
  35 <p>
  36         <span class="bold"><strong>type:</strong></span> The same type as <code class="computeroutput"><span class="identifier">remove_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">*</span></code>.
  37       </p>
  38 <p>
  39         The rationale for this template is that it produces the same type as <code class="computeroutput"><span class="identifier">TYPEOF</span><span class="special">(&amp;</span><span class="identifier">t</span><span class="special">)</span></code>, where
  40         <code class="computeroutput"><span class="identifier">t</span></code> is an object of type <code class="computeroutput"><span class="identifier">T</span></code>.
  41       </p>
  42 <p>
  43         <span class="bold"><strong>C++ Standard Reference:</strong></span> 8.3.1.
  44       </p>
  45 <p>
  46         <span class="bold"><strong>Compiler Compatibility:</strong></span> If the compiler
  47         does not support partial specialization of class-templates then this template
  48         will compile, but the member <code class="computeroutput"><span class="identifier">type</span></code>
  49         will always be the same as type <code class="computeroutput"><span class="identifier">T</span></code>
  50         except where <a class="link" href="../category/transform.html#boost_typetraits.category.transform.broken_compiler_workarounds_">compiler
  51         workarounds</a> have been applied.
  52       </p>
  53 <p>
  54         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
  55         <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">add_pointer</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  56         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>
  57       </p>
  58 <div class="table">
  59 <a name="boost_typetraits.reference.add_pointer.examples"></a><p class="title"><b>Table&#160;1.13.&#160;Examples</b></p>
  60 <div class="table-contents"><table class="table" summary="Examples">
  61 <colgroup>
  62 <col>
  63 <col>
  64 </colgroup>
  65 <thead><tr>
  66 <th>
  67                 <p>
  68                   Expression
  69                 </p>
  70               </th>
  71 <th>
  72                 <p>
  73                   Result Type
  74                 </p>
  75               </th>
  76 </tr></thead>
  77 <tbody>
  78 <tr>
  79 <td>
  80                 <p>
  81                   <code class="computeroutput"><span class="identifier">add_pointer</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
  82                 </p>
  83               </td>
  84 <td>
  85                 <p>
  86                   <code class="computeroutput"><span class="keyword">int</span><span class="special">*</span></code>
  87                 </p>
  88               </td>
  89 </tr>
  90 <tr>
  91 <td>
  92                 <p>
  93                   <code class="computeroutput"><span class="identifier">add_pointer</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="keyword">const</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
  94                 </p>
  95               </td>
  96 <td>
  97                 <p>
  98                   <code class="computeroutput"><span class="keyword">int</span> <span class="keyword">const</span><span class="special">*</span></code>
  99                 </p>
 100               </td>
 101 </tr>
 102 <tr>
 103 <td>
 104                 <p>
 105                   <code class="computeroutput"><span class="identifier">add_pointer</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">*&gt;::</span><span class="identifier">type</span></code>
 106                 </p>
 107               </td>
 108 <td>
 109                 <p>
 110                   <code class="computeroutput"><span class="keyword">int</span><span class="special">**</span></code>
 111                 </p>
 112               </td>
 113 </tr>
 114 <tr>
 115 <td>
 116                 <p>
 117                   <code class="computeroutput"><span class="identifier">add_pointer</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">*&amp;&gt;::</span><span class="identifier">type</span></code>
 118                 </p>
 119               </td>
 120 <td>
 121                 <p>
 122                   <code class="computeroutput"><span class="keyword">int</span><span class="special">**</span></code>
 123                 </p>
 124               </td>
 125 </tr>
 126 </tbody>
 127 </table></div>
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