boost/type_traits/is_union.hpp
// (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