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/remove_cv.hpp> |
---|
15 | #include <boost/type_traits/config.hpp> |
---|
16 | #include <boost/type_traits/intrinsics.hpp> |
---|
17 | |
---|
18 | // should be the last #include |
---|
19 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
---|
20 | |
---|
21 | namespace boost { |
---|
22 | |
---|
23 | namespace detail { |
---|
24 | #ifndef __GNUC__ |
---|
25 | template <typename T> struct is_union_impl |
---|
26 | { |
---|
27 | typedef typename remove_cv<T>::type cvt; |
---|
28 | BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(cvt)); |
---|
29 | }; |
---|
30 | #else |
---|
31 | // |
---|
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: |
---|
35 | // |
---|
36 | template <typename T> struct is_union_impl |
---|
37 | { |
---|
38 | BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(T)); |
---|
39 | }; |
---|
40 | #endif |
---|
41 | } // namespace detail |
---|
42 | |
---|
43 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_union,T,::boost::detail::is_union_impl<T>::value) |
---|
44 | |
---|
45 | } // namespace boost |
---|
46 | |
---|
47 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
---|
48 | |
---|
49 | #endif // BOOST_TT_IS_UNION_HPP_INCLUDED |
---|