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<a name="boost_typetraits.intro"></a><a class="link" href="intro.html" title="Introduction">Introduction</a>
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<p>
      The Boost type-traits library contains a set of very specific traits classes,
      each of which encapsulate a single trait from the C++ type system; for example,
      is a type a pointer or a reference type? Or does a type have a trivial constructor,
      or a const-qualifier?
    </p>
<p>
      The type-traits classes share a unified design: each class inherits from the
      type <a class="link" href="reference/integral_constant.html" title="integral_constant">true_type</a>
      if the type has the specified property and inherits from <a class="link" href="reference/integral_constant.html" title="integral_constant">false_type</a>
      otherwise.
    </p>
<p>
      The type-traits library also contains a set of classes that perform a specific
      transformation on a type; for example, they can remove a top-level const or
      volatile qualifier from a type. Each class that performs a transformation defines
      a single typedef-member <code class="computeroutput"><span class="identifier">type</span></code>
      that is the result of the transformation.
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
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