//  (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/remove_cv.hpp>

#include <boost/type_traits/config.hpp>

#include <boost/type_traits/intrinsics.hpp>

// should be the last #include

#include <boost/type_traits/detail/bool_trait_def.hpp>

namespace boost {

namespace detail {

#ifndef __GNUC__

template <typename T> struct is_union_impl

{

   typedef typename remove_cv<T>::type cvt;

   BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(cvt));

};

#else

//

// using remove_cv here generates a whole load of needless

// warnings with gcc, since it doesn't do any good with gcc

// in any case (at least at present), just remove it:

//

template <typename T> struct is_union_impl

{

   BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(T));

};

#endif

} // namespace detail

BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_union,T,::boost::detail::is_union_impl<T>::value)

} // namespace boost

#include <boost/type_traits/detail/bool_trait_undef.hpp>

#endif // BOOST_TT_IS_UNION_HPP_INCLUDED