| |
| // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard |
| // Hinnant & John Maddock 2000. |
| // Use, modification and distribution are subject to the Boost Software License, |
| // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt). |
| // |
| // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
| |
| |
| #ifndef BOOST_TT_IS_UNION_HPP_INCLUDED |
| #define BOOST_TT_IS_UNION_HPP_INCLUDED |
| |
| #include <ndnboost/type_traits/remove_cv.hpp> |
| #include <ndnboost/type_traits/config.hpp> |
| #include <ndnboost/type_traits/intrinsics.hpp> |
| |
| // should be the last #include |
| #include <ndnboost/type_traits/detail/bool_trait_def.hpp> |
| |
| namespace ndnboost { |
| |
| namespace detail { |
| #ifndef __GNUC__ |
| template <typename T> struct is_union_impl |
| { |
| typedef typename remove_cv<T>::type cvt; |
| #ifdef BOOST_IS_UNION |
| BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(cvt)); |
| #else |
| BOOST_STATIC_CONSTANT(bool, value = false); |
| #endif |
| }; |
| #else |
| // |
| // using remove_cv here generates a whole load of needless |
| // warnings with gcc, since it doesn't do any good with gcc |
| // in any case (at least at present), just remove it: |
| // |
| template <typename T> struct is_union_impl |
| { |
| #ifdef BOOST_IS_UNION |
| BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(T)); |
| #else |
| BOOST_STATIC_CONSTANT(bool, value = false); |
| #endif |
| }; |
| #endif |
| } // namespace detail |
| |
| BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_union,T,::ndnboost::detail::is_union_impl<T>::value) |
| |
| } // namespace ndnboost |
| |
| #include <ndnboost/type_traits/detail/bool_trait_undef.hpp> |
| |
| #endif // BOOST_TT_IS_UNION_HPP_INCLUDED |