ceph/src/boost/libs/type_traits/doc/html/boost_typetraits/reference/add_lvalue_reference.html

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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_typetraits.reference.add_lvalue_reference"></a><a class="link" href="add_lvalue_reference.html" title="add_lvalue_reference">add_lvalue_reference</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_lvalue_reference</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> If <code class="computeroutput"><span class="identifier">T</span></code>
  37         names an object or function type then the member typedef <code class="computeroutput"><span class="identifier">type</span></code>
  38         shall name <code class="computeroutput"><span class="identifier">T</span><span class="special">&amp;</span></code>;
  39         otherwise, if <code class="computeroutput"><span class="identifier">T</span></code> names a type
  40         <span class="emphasis"><em>rvalue reference to U</em></span> then the member typedef type shall
  41         name <code class="computeroutput"><span class="identifier">U</span><span class="special">&amp;</span></code>;
  42         otherwise, type shall name <code class="computeroutput"><span class="identifier">T</span></code>.
  43       </p>
  44 <p>
  45         <span class="bold"><strong>C++ Standard Reference:</strong></span> 20.7.6.2.
  46       </p>
  47 <p>
  48         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
  49         <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_lvalue_reference</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  50         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>
  51       </p>
  52 <div class="table">
  53 <a name="boost_typetraits.reference.add_lvalue_reference.examples"></a><p class="title"><b>Table&#160;1.12.&#160;Examples</b></p>
  54 <div class="table-contents"><table class="table" summary="Examples">
  55 <colgroup>
  56 <col>
  57 <col>
  58 </colgroup>
  59 <thead><tr>
  60 <th>
  61                 <p>
  62                   Expression
  63                 </p>
  64               </th>
  65 <th>
  66                 <p>
  67                   Result Type
  68                 </p>
  69               </th>
  70 </tr></thead>
  71 <tbody>
  72 <tr>
  73 <td>
  74                 <p>
  75                   <code class="computeroutput"><span class="identifier">add_lvalue_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&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">add_lvalue_reference</span><span class="special">&lt;</span><span class="keyword">int</span>
  88                   <span class="keyword">const</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
  89                 </p>
  90               </td>
  91 <td>
  92                 <p>
  93                   <code class="computeroutput"><span class="keyword">int</span> <span class="keyword">const</span><span class="special">&amp;</span></code>
  94                 </p>
  95               </td>
  96 </tr>
  97 <tr>
  98 <td>
  99                 <p>
 100                   <code class="computeroutput"><span class="identifier">add_lvalue_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">*&gt;::</span><span class="identifier">type</span></code>
 101                 </p>
 102               </td>
 103 <td>
 104                 <p>
 105                   <code class="computeroutput"><span class="keyword">int</span><span class="special">*&amp;</span></code>
 106                 </p>
 107               </td>
 108 </tr>
 109 <tr>
 110 <td>
 111                 <p>
 112                   <code class="computeroutput"><span class="identifier">add_lvalue_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">*&amp;&gt;::</span><span class="identifier">type</span></code>
 113                 </p>
 114               </td>
 115 <td>
 116                 <p>
 117                   <code class="computeroutput"><span class="keyword">int</span><span class="special">*&amp;</span></code>
 118                 </p>
 119               </td>
 120 </tr>
 121 <tr>
 122 <td>
 123                 <p>
 124                   <code class="computeroutput"><span class="identifier">add_lvalue_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;&amp;&gt;::</span><span class="identifier">type</span></code>
 125                 </p>
 126               </td>
 127 <td>
 128                 <p>
 129                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
 130                 </p>
 131               </td>
 132 </tr>
 133 <tr>
 134 <td>
 135                 <p>
 136                   <code class="computeroutput"><span class="identifier">add_lvalue_reference</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
 137                 </p>
 138               </td>
 139 <td>
 140                 <p>
 141                   <code class="computeroutput"><span class="keyword">void</span></code>
 142                 </p>
 143               </td>
 144 </tr>
 145 </tbody>
 146 </table></div>
 147 </div>
 148 <br class="table-break"><p>
 149         <span class="bold"><strong>Compiler Compatibility:</strong></span> All current compilers
 150         are supported by this trait.
 151       </p>
 152 </div>
 153 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 154 <td align="left"></td>
 155 <td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
 156       Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
 157       Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
 158       Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
 159       Watanabe<p>
 160         Distributed under the Boost Software License, Version 1.0. (See accompanying
 161         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>)
 162       </p>
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