2 // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
3 // Hinnant & John Maddock 2000.
4 // Use, modification and distribution are subject to the Boost Software License,
5 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt).
8 // See http://www.boost.org/libs/type_traits for most recent version including documentation.
11 #ifndef BOOST_TT_IS_UNION_HPP_INCLUDED
12 #define BOOST_TT_IS_UNION_HPP_INCLUDED
14 #include <boost/type_traits/remove_cv.hpp>
15 #include <boost/type_traits/config.hpp>
16 #include <boost/type_traits/intrinsics.hpp>
18 // should be the last #include
19 #include <boost/type_traits/detail/bool_trait_def.hpp>
25 template <typename T> struct is_union_impl
27 typedef typename remove_cv<T>::type cvt;
28 BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(cvt));
32 // using remove_cv here generates a whole load of needless
33 // warnings with gcc, since it doesn't do any good with gcc
34 // in any case (at least at present), just remove it:
36 template <typename T> struct is_union_impl
38 BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(T));
43 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_union,T,::boost::detail::is_union_impl<T>::value)
47 #include <boost/type_traits/detail/bool_trait_undef.hpp>
49 #endif // BOOST_TT_IS_UNION_HPP_INCLUDED