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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="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, 2006 Adobe Systems Inc, David Abrahams, |
| Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant, Jesse Jones, Mat |
| Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten Ottosen, Robert |
| Ramey and Jeremy Siek<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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