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

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  27 <a name="boost_typetraits.reference.is_rvalue_reference"></a><a class="link" href="is_rvalue_reference.html" title="is_rvalue_reference">is_rvalue_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">is_rvalue_reference</span> <span class="special">:</span> <span class="keyword">public</span> <em class="replaceable"><code><a class="link" href="integral_constant.html" title="integral_constant">true_type</a>-or-<a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code></em> <span class="special">{};</span>
  31 </pre>
  32 <p>
  33         <span class="bold"><strong>Inherits:</strong></span> If T is an rvalue reference type
  34         then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
  35         otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
  36       </p>
  37 <p>
  38         <span class="bold"><strong>C++ Standard Reference:</strong></span> 3.9.2 and 8.3.2.
  39       </p>
  40 <p>
  41         <span class="bold"><strong>Compiler Compatibility:</strong></span> All current compilers
  42         are supported by this trait.
  43       </p>
  44 <p>
  45         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
  46         <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">is_rvalue_reference</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  47         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>
  48       </p>
  49 <p>
  50         <span class="bold"><strong>Examples:</strong></span>
  51       </p>
  52 <div class="blockquote"><blockquote class="blockquote"><p>
  53           <code class="computeroutput"><span class="identifier">is_rvalue_reference</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;&amp;&gt;</span></code>
  54           inherits from <code class="computeroutput"><a class="link" href="integral_constant.html" title="integral_constant">true_type</a></code>.
  55         </p></blockquote></div>
  56 <div class="blockquote"><blockquote class="blockquote"><p>
  57           <code class="computeroutput"><span class="identifier">is_rvalue_reference</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="keyword">const</span><span class="special">&amp;&amp;&gt;::</span><span class="identifier">type</span></code>
  58           is the type <code class="computeroutput"><a class="link" href="integral_constant.html" title="integral_constant">true_type</a></code>.
  59         </p></blockquote></div>
  60 <div class="blockquote"><blockquote class="blockquote"><p>
  61           <code class="computeroutput"><span class="identifier">is_rvalue_reference</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>
  62           is the type <code class="computeroutput"><a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code>.
  63         </p></blockquote></div>
  64 <div class="blockquote"><blockquote class="blockquote"><p>
  65           <code class="computeroutput"><span class="identifier">is_rvalue_reference</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="special">(&amp;&amp;)(</span><span class="keyword">long</span><span class="special">)&gt;::</span><span class="identifier">value</span></code> is an integral constant expression
  66           that evaluates to <span class="emphasis"><em>true</em></span> (the argument in this case
  67           is an rvalue reference to a function).
  68         </p></blockquote></div>
  69 <div class="blockquote"><blockquote class="blockquote"><p>
  70           <code class="computeroutput"><span class="identifier">is_rvalue_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value_type</span></code> is the type <code class="computeroutput"><span class="keyword">bool</span></code>.
  71         </p></blockquote></div>
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