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- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_typetraits.reference.integral_constant"></a><a class="link" href="integral_constant.html" title="integral_constant">integral_constant</a>
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- <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> <span class="identifier">T</span> <span class="identifier">val</span><span class="special">></span>
- <span class="keyword">struct</span> <span class="identifier">integral_constant</span>
- <span class="special">{</span>
- <span class="keyword">typedef</span> <span class="identifier">integral_constant</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">val</span><span class="special">></span> <span class="identifier">type</span><span class="special">;</span>
- <span class="keyword">typedef</span> <span class="identifier">T</span> <span class="identifier">value_type</span><span class="special">;</span>
- <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="identifier">value</span> <span class="special">=</span> <span class="identifier">val</span><span class="special">;</span>
- <span class="keyword">constexpr</span> <span class="keyword">operator</span> <span class="identifier">T</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
- <span class="special">};</span>
- <span class="keyword">typedef</span> <span class="identifier">integral_constant</span><span class="special"><</span><span class="keyword">bool</span><span class="special">,</span> <span class="keyword">true</span><span class="special">></span> <span class="identifier">true_type</span><span class="special">;</span>
- <span class="keyword">typedef</span> <span class="identifier">integral_constant</span><span class="special"><</span><span class="keyword">bool</span><span class="special">,</span> <span class="keyword">false</span><span class="special">></span> <span class="identifier">false_type</span><span class="special">;</span>
- </pre>
- <p>
- Class template <code class="computeroutput"><span class="identifier">integral_constant</span></code>
- is the common base class for all the value-based type traits. The two typedef's
- <code class="computeroutput"><span class="identifier">true_type</span></code> and <code class="computeroutput"><span class="identifier">false_type</span></code> are provided for convenience:
- most of the value traits are Boolean properties and so will inherit from
- one of these.
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- <td align="right"><div class="copyright-footer">Copyright © 2000, 2011 Adobe Systems Inc, David Abrahams,
- Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
- Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
- Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
- Watanabe<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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