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| 2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard |
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| 3 | // Hinnant & John Maddock 2000. |
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| 4 | // Use, modification and distribution are subject to the Boost Software License, |
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| 5 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 6 | // http://www.boost.org/LICENSE_1_0.txt). |
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| 7 | // |
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| 8 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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| 9 | |
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| 10 | |
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| 11 | #ifndef BOOST_TT_IS_UNION_HPP_INCLUDED |
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| 12 | #define BOOST_TT_IS_UNION_HPP_INCLUDED |
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| 13 | |
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| 14 | #include <boost/type_traits/intrinsics.hpp> |
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| 15 | #include <boost/type_traits/integral_constant.hpp> |
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| 16 | |
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| 17 | namespace boost { |
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| 18 | |
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| 19 | #ifdef BOOST_IS_UNION |
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| 20 | template <class T> struct is_union : public integral_constant<bool, BOOST_IS_UNION(T)> {}; |
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| 21 | #else |
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| 22 | template <class T> struct is_union : public integral_constant<bool, false> {}; |
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| 23 | #endif |
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| 24 | |
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| 25 | template <class T> struct is_union<T const> : public is_union<T>{}; |
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| 26 | template <class T> struct is_union<T volatile const> : public is_union<T>{}; |
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| 27 | template <class T> struct is_union<T volatile> : public is_union<T>{}; |
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| 28 | |
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| 29 | } // namespace boost |
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| 30 | |
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| 31 | #endif // BOOST_TT_IS_UNION_HPP_INCLUDED |
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| 32 | |
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