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- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_typetraits.reference.conditional"></a><a class="link" href="conditional.html" title="conditional">conditional</a>
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- <span class="bold"><strong>Header:</strong></span> <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">conditional</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
- 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>
- </p>
- <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
- <span class="keyword">template</span> <span class="special"><</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">></span> <span class="keyword">struct</span> <a class="link" href="conditional.html" title="conditional">conditional</a><span class="special">;</span>
- <span class="keyword">template</span> <span class="special"><</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">></span> <span class="keyword">using</span> <span class="identifier">conditional_t</span> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">conditional</span><span class="special"><</span><span class="identifier">B</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span><span class="special">>::</span><span class="identifier">type</span><span class="special">;</span> <span class="comment">// C++11 and above</span>
- <span class="special">}</span>
- </pre>
- <p>
- If B is true, the member typedef type shall equal T. If B is false, the member
- typedef type shall equal U.
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- Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
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