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

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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_typetraits.reference.is_member_object_pointer"></a><a class="link" href="is_member_object_pointer.html" title="is_member_object_pointer">is_member_object_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">is_member_object_pointer</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 a (possibly cv-qualified)
  34         pointer to a member object (a data member) 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 8.3.3.
  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_member_object_pointer</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_member_object_pointer</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="special">(</span><span class="identifier">MyClass</span><span class="special">::*)&gt;</span></code> inherits from <code class="computeroutput"><a class="link" href="integral_constant.html" title="integral_constant">true_type</a></code>.
  54         </p></blockquote></div>
  55 <div class="blockquote"><blockquote class="blockquote"><p>
  56           <code class="computeroutput"><span class="identifier">is_member_object_pointer</span><span class="special">&lt;</span><span class="keyword">double</span> <span class="special">(</span><span class="identifier">MyClass</span><span class="special">::*)&gt;::</span><span class="identifier">type</span></code>
  57           is the type <code class="computeroutput"><a class="link" href="integral_constant.html" title="integral_constant">true_type</a></code>.
  58         </p></blockquote></div>
  59 <div class="blockquote"><blockquote class="blockquote"><p>
  60           <code class="computeroutput"><span class="identifier">is_member_object_pointer</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">int</span> <span class="special">(</span><span class="identifier">MyClass</span><span class="special">::*)&gt;::</span><span class="identifier">value</span></code>
  61           is an integral constant expression that evaluates to <span class="emphasis"><em>true</em></span>.
  62         </p></blockquote></div>
  63 <div class="blockquote"><blockquote class="blockquote"><p>
  64           <code class="computeroutput"><span class="identifier">is_member_object_pointer</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="special">(</span><span class="identifier">MyClass</span><span class="special">::*)(</span><span class="keyword">void</span><span class="special">)&gt;::</span><span class="identifier">value</span></code>
  65           is an integral constant expression that evaluates to <span class="emphasis"><em>false</em></span>:
  66           the argument in this case is a pointer to a member function and not a member
  67           object, see <a class="link" href="is_member_function_pointer.html" title="is_member_function_pointer">is_member_function_pointer</a>
  68           and <a class="link" href="is_member_pointer.html" title="is_member_pointer">is_member_pointer</a>
  69         </p></blockquote></div>
  70 <div class="blockquote"><blockquote class="blockquote"><p>
  71           <code class="computeroutput"><span class="identifier">is_member_object_pointer</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value_type</span></code>
  72           is the type <code class="computeroutput"><span class="keyword">bool</span></code>.
  73         </p></blockquote></div>
  74 </div>
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  78       Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
  79       Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
  80       Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
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  82         Distributed under the Boost Software License, Version 1.0. (See accompanying
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