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+
+//  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
+//  Hinnant & John Maddock 2000.  
+//  Use, modification and distribution are subject to the Boost Software License,
+//  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt).
+//
+//  See http://www.boost.org/libs/type_traits for most recent version including documentation.
+
+
+#ifndef BOOST_TT_IS_UNION_HPP_INCLUDED
+#define BOOST_TT_IS_UNION_HPP_INCLUDED
+
+#include <boost/type_traits/intrinsics.hpp>
+#include <boost/type_traits/integral_constant.hpp>
+
+namespace boost {
+
+#ifdef BOOST_IS_UNION
+template <class T> struct is_union : public integral_constant<bool, BOOST_IS_UNION(T)> {};
+#else
+template <class T> struct is_union : public integral_constant<bool, false> {};
+#endif
+
+template <class T> struct is_union<T const> : public is_union<T>{};
+template <class T> struct is_union<T volatile const> : public is_union<T>{};
+template <class T> struct is_union<T volatile> : public is_union<T>{};
+
+} // namespace boost
+
+#endif // BOOST_TT_IS_UNION_HPP_INCLUDED