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