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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.category.value_traits"></a><a class="link" href="value_traits.html" title="Type Traits that Describe the Properties of a Type">Type Traits that
      Describe the Properties of a Type</a>
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<dt><span class="section"><a href="value_traits/primary.html">Categorizing
        a Type</a></span></dt>
<dt><span class="section"><a href="value_traits/properties.html">General
        Type Properties</a></span></dt>
<dt><span class="section"><a href="value_traits/relate.html">Relationships
        Between Two Types</a></span></dt>
<dt><span class="section"><a href="value_traits/operators.html">Operator
        Type Traits</a></span></dt>
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<p>
        These traits are all <span class="emphasis"><em>value traits</em></span>, which is to say the
        traits classes all inherit from <a class="link" href="../reference/integral_constant.html" title="integral_constant">integral_constant</a>,
        and are used to access some numerical property of a type. Often this is a
        simple true or false Boolean value, but in a few cases may be some other
        integer value (for example when dealing with type alignments, or array bounds:
        see <code class="computeroutput"><a class="link" href="../reference/alignment_of.html" title="alignment_of">alignment_of</a></code>,
        <code class="computeroutput"><a class="link" href="../reference/rank.html" title="rank">rank</a></code>
        and <code class="computeroutput"><a class="link" href="../reference/extent.html" title="extent">extent</a></code>).
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      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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	24	</div>
	25	<div class="section">
	26	<div class="titlepage"><div><div><h3 class="title">
	27	<a name="boost_typetraits.category.value_traits"></a><a class="link" href="value_traits.html" title="Type Traits that Describe the Properties of a Type">Type Traits that
	28	Describe the Properties of a Type</a>
	29	</h3></div></div></div>
	30	<div class="toc"><dl>
	31	<dt><span class="section"><a href="value_traits/primary.html">Categorizing
	32	a Type</a></span></dt>
	33	<dt><span class="section"><a href="value_traits/properties.html">General
	34	Type Properties</a></span></dt>
	35	<dt><span class="section"><a href="value_traits/relate.html">Relationships
	36	Between Two Types</a></span></dt>
	37	<dt><span class="section"><a href="value_traits/operators.html">Operator
	38	Type Traits</a></span></dt>
	39	</dl></div>
	40	<p>
	41	These traits are all <span class="emphasis"><em>value traits</em></span>, which is to say the
	42	traits classes all inherit from <a class="link" href="../reference/integral_constant.html" title="integral_constant">integral_constant</a>,
	43	and are used to access some numerical property of a type. Often this is a
	44	simple true or false Boolean value, but in a few cases may be some other
	45	integer value (for example when dealing with type alignments, or array bounds:
	46	see <code class="computeroutput"><a class="link" href="../reference/alignment_of.html" title="alignment_of">alignment_of</a></code>,
	47	<code class="computeroutput"><a class="link" href="../reference/rank.html" title="rank">rank</a></code>
	48	and <code class="computeroutput"><a class="link" href="../reference/extent.html" title="extent">extent</a></code>).
	49	</p>
	50	</div>
	51	<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
	52	<td align="left"></td>
	53	<td align="right"><div class="copyright-footer">Copyright © 2000, 2011 Adobe Systems Inc, David Abrahams,
	54	Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
	55	Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
	56	Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
	57	Watanabe<p>
	58	Distributed under the Boost Software License, Version 1.0. (See accompanying
	59	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>)
	60	</p>
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