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

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  27 <a name="boost_typetraits.reference.conditional"></a><a class="link" href="conditional.html" title="conditional">conditional</a>
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  29 <p>
  30         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
  31         <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">conditional</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  32         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>
  33       </p>
  34 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  35   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">bool</span> <span class="identifier">B</span><span class="special">,</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>  <span class="keyword">struct</span> <a class="link" href="conditional.html" title="conditional">conditional</a><span class="special">;</span>
  36 <span class="special">}</span>
  37 </pre>
  38 <p>
  39         If B is true, the member typedef type shall equal T. If B is false, the member
  40         typedef type shall equal U.
  41       </p>
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