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26 | <div class="titlepage"><div><div><h3 class="title"> | |
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"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></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"><</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">></span></code> | |
47 | or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special"><</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">></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"><</span><span class="keyword">int</span><span class="special">&&></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"><</span><span class="keyword">int</span> <span class="keyword">const</span><span class="special">&&>::</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"><</span><span class="keyword">int</span> <span class="keyword">const</span><span class="special">&>::</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"><</span><span class="keyword">int</span> <span class="special">(&&)(</span><span class="keyword">long</span><span class="special">)>::</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"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value_type</span></code> is the type <code class="computeroutput"><span class="keyword">bool</span></code>. | |
71 | </p></blockquote></div> | |
72 | </div> | |
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