source: NonGTP/Boost/boost/type_traits/is_union.hpp @ 857

Revision 857, 1.4 KB checked in by igarcia, 18 years ago (diff)
Line 
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
21namespace boost {
22
23namespace detail {
24#ifndef __GNUC__
25template <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//
36template <typename T> struct is_union_impl
37{
38   BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(T));
39};
40#endif
41} // namespace detail
42
43BOOST_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
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