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    24. 

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    25. 

  25. <div class="section">
    26. 

  26. <div class="titlepage"><div><div><h3 class="title">
    27. 

  27. <a name="boost_typetraits.reference.copy_reference"></a><a class="link" href="copy_reference.html" title="copy_reference_">copy_reference_</a>
    28. 

  28. </h3></div></div></div>
    29. 

  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">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
    30. 

  30. <span class="keyword">struct</span> <span class="identifier">copy_reference</span>
    31. 

  31. <span class="special">{</span>
    32. 

  32.     <span class="keyword">typedef</span> <em class="replaceable"><code>see-below</code></em> <span class="identifier">type</span><span class="special">;</span>
    33. 

  33. <span class="special">};</span>
    34. 

  34. 

  35. <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
    36. 

  36. <span class="keyword">using</span> <span class="identifier">copy_reference_t</span> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">;</span>
    37. 

  37. </pre>
    38. 

  38. <p>
    39. 

  39.         <span class="bold"><strong>type:</strong></span> <code class="literal">T <span class="emphasis"><em>ref</em></span></code>,
    40. 

  40.         where <span class="emphasis"><em>ref</em></span> are the ref-qualifiers of <code class="computeroutput"><span class="identifier">U</span></code>.
    41. 

  41.       </p>
    42. 

  42. <p>
    43. 

  43.         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"><span class="preprocessor">#include</span>
    44. 

  44.         <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">copy_reference</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
    45. 

  45.         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;&gt;</span></code>
    46. 

  46.       </p>
    47. 

  47. <div class="table">
    48. 

  48. <a name="boost_typetraits.reference.copy_reference.examples"></a><p class="title"><b>Table&#160;1.19.&#160;Examples</b></p>
    49. 

  49. <div class="table-contents"><table class="table" summary="Examples">
    50. 

  50. <colgroup>
    51. 

  51. <col>
    52. 

  52. <col>
    53. 

  53. </colgroup>
    54. 

  54. <thead><tr>
    55. 

  55. <th>
    56. 

  56.                 <p>
    57. 

  57.                   Expression
    58. 

  58.                 </p>
    59. 

  59.               </th>
    60. 

  60. <th>
    61. 

  61.                 <p>
    62. 

  62.                   Result Type
    63. 

  63.                 </p>
    64. 

  64.               </th>
    65. 

  65. </tr></thead>
    66. 

  66. <tbody>
    67. 

  67. <tr>
    68. 

  68. <td>
    69. 

  69.                 <p>
    70. 

  70.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
    71. 

  71.                 </p>
    72. 

  72.               </td>
    73. 

  73. <td>
    74. 

  74.                 <p>
    75. 

  75.                   <code class="computeroutput"><span class="keyword">int</span></code>
    76. 

  76.                 </p>
    77. 

  77.               </td>
    78. 

  78. </tr>
    79. 

  79. <tr>
    80. 

  80. <td>
    81. 

  81.                 <p>
    82. 

  82.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
    83. 

  83.                 </p>
    84. 

  84.               </td>
    85. 

  85. <td>
    86. 

  86.                 <p>
    87. 

  87.                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
    88. 

  88.                 </p>
    89. 

  89.               </td>
    90. 

  90. </tr>
    91. 

  91. <tr>
    92. 

  92. <td>
    93. 

  93.                 <p>
    94. 

  94.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&amp;&amp;&gt;::</span><span class="identifier">type</span></code>
    95. 

  95.                 </p>
    96. 

  96.               </td>
    97. 

  97. <td>
    98. 

  98.                 <p>
    99. 

  99.                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;&amp;</span></code>
    100. 

  100.                 </p>
    101. 

  101.               </td>
    102. 

  102. </tr>
    103. 

  103. <tr>
    104. 

  104. <td>
    105. 

  105.                 <p>
    106. 

  106.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;,</span> <span class="keyword">char</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
    107. 

  107.                 </p>
    108. 

  108.               </td>
    109. 

  109. <td>
    110. 

  110.                 <p>
    111. 

  111.                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
    112. 

  112.                 </p>
    113. 

  113.               </td>
    114. 

  114. </tr>
    115. 

  115. <tr>
    116. 

  116. <td>
    117. 

  117.                 <p>
    118. 

  118.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;,</span> <span class="keyword">char</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
    119. 

  119.                 </p>
    120. 

  120.               </td>
    121. 

  121. <td>
    122. 

  122.                 <p>
    123. 

  123.                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
    124. 

  124.                 </p>
    125. 

  125.               </td>
    126. 

  126. </tr>
    127. 

  127. <tr>
    128. 

  128. <td>
    129. 

  129.                 <p>
    130. 

  130.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;,</span> <span class="keyword">char</span><span class="special">&amp;&amp;&gt;::</span><span class="identifier">type</span></code>
    131. 

  131.                 </p>
    132. 

  132.               </td>
    133. 

  133. <td>
    134. 

  134.                 <p>
    135. 

  135.                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
    136. 

  136.                 </p>
    137. 

  137.               </td>
    138. 

  138. </tr>
    139. 

  139. <tr>
    140. 

  140. <td>
    141. 

  141.                 <p>
    142. 

  142.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;&amp;,</span> <span class="keyword">char</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
    143. 

  143.                 </p>
    144. 

  144.               </td>
    145. 

  145. <td>
    146. 

  146.                 <p>
    147. 

  147.                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;&amp;</span></code>
    148. 

  148.                 </p>
    149. 

  149.               </td>
    150. 

  150. </tr>
    151. 

  151. <tr>
    152. 

  152. <td>
    153. 

  153.                 <p>
    154. 

  154.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;&amp;,</span> <span class="keyword">char</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
    155. 

  155.                 </p>
    156. 

  156.               </td>
    157. 

  157. <td>
    158. 

  158.                 <p>
    159. 

  159.                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
    160. 

  160.                 </p>
    161. 

  161.               </td>
    162. 

  162. </tr>
    163. 

  163. <tr>
    164. 

  164. <td>
    165. 

  165.                 <p>
    166. 

  166.                   <code class="computeroutput"><span class="identifier">copy_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;&amp;,</span> <span class="keyword">char</span><span class="special">&amp;&amp;&gt;::</span><span class="identifier">type</span></code>
    167. 

  167.                 </p>
    168. 

  168.               </td>
    169. 

  169. <td>
    170. 

  170.                 <p>
    171. 

  171.                   <code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;&amp;</span></code>
    172. 

  172.                 </p>
    173. 

  173.               </td>
    174. 

  174. </tr>
    175. 

  175. </tbody>
    176. 

  176. </table></div>
    177. 

  177. </div>
    178. 

  178. <br class="table-break"><p>
    179. 

  179.         <span class="bold"><strong>Compiler Compatibility:</strong></span> All current compilers
    180. 

  180.         are supported by this trait. The type alias <code class="computeroutput"><span class="identifier">copy_reference_t</span></code>
    181. 

  181.         is only available if the compiler supports template aliases.
    182. 

  182.       </p>
    183. 

  183. </div>
    184. 

  184. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    185. 

  185. <td align="left"></td>
    186. 

  186. <td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
    187. 

  187.       Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
    188. 

  188.       Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
    189. 

  189.       Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
    190. 

  190.       Watanabe<p>
    191. 

  191.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    192. 

  192.         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>)
    193. 

  193.       </p>
    194. 

  194. </div></td>
    195. 

  195. </tr></table>
    196. 

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