1 |
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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/remove_cv.hpp"
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15 | #include "boost/type_traits/config.hpp"
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16 | #include "boost/type_traits/intrinsics.hpp"
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17 |
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18 | // should be the last #include
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19 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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20 |
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21 | namespace boost {
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22 |
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23 | namespace detail {
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24 | #ifndef __GNUC__
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25 | template <typename T> struct is_union_impl
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26 | {
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27 | typedef typename remove_cv<T>::type cvt;
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28 | BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(cvt));
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29 | };
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30 | #else
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31 | //
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32 | // using remove_cv here generates a whole load of needless
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33 | // warnings with gcc, since it doesn't do any good with gcc
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34 | // in any case (at least at present), just remove it:
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35 | //
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36 | template <typename T> struct is_union_impl
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37 | {
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38 | BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(T));
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39 | };
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40 | #endif
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41 | } // namespace detail
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42 |
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43 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_union,T,::boost::detail::is_union_impl<T>::value)
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44 |
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45 | } // namespace boost
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46 |
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47 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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48 |
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49 | #endif // BOOST_TT_IS_UNION_HPP_INCLUDED
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