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1 | |
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). | |
7 | // | |
8 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. | |
9 | ||
10 | ||
11 | #ifndef BOOST_TT_IS_UNION_HPP_INCLUDED | |
12 | #define BOOST_TT_IS_UNION_HPP_INCLUDED | |
13 | ||
14 | #include <boost/type_traits/intrinsics.hpp> | |
15 | #include <boost/type_traits/integral_constant.hpp> | |
16 | ||
17 | namespace boost { | |
18 | ||
19 | #ifdef BOOST_IS_UNION | |
20 | template <class T> struct is_union : public integral_constant<bool, BOOST_IS_UNION(T)> {}; | |
21 | #else | |
22 | template <class T> struct is_union : public integral_constant<bool, false> {}; | |
23 | #endif | |
24 | ||
25 | template <class T> struct is_union<T const> : public is_union<T>{}; | |
26 | template <class T> struct is_union<T volatile const> : public is_union<T>{}; | |
27 | template <class T> struct is_union<T volatile> : public is_union<T>{}; | |
28 | ||
29 | } // namespace boost | |
30 | ||
31 | #endif // BOOST_TT_IS_UNION_HPP_INCLUDED |