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- // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
- // Hinnant & John Maddock 2000-2003.
- // 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_CLASS_HPP_INCLUDED
- #define BOOST_TT_IS_CLASS_HPP_INCLUDED
- #include <boost/type_traits/detail/config.hpp>
- #include <boost/type_traits/intrinsics.hpp>
- #include <boost/type_traits/integral_constant.hpp>
- #ifndef BOOST_IS_CLASS
- # include <boost/type_traits/is_union.hpp>
- #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION
- # include <boost/type_traits/detail/yes_no_type.hpp>
- #else
- # include <boost/type_traits/is_scalar.hpp>
- # include <boost/type_traits/is_array.hpp>
- # include <boost/type_traits/is_reference.hpp>
- # include <boost/type_traits/is_void.hpp>
- # include <boost/type_traits/is_function.hpp>
- #endif
- #endif // BOOST_IS_CLASS
- namespace boost {
- namespace detail {
- #ifndef BOOST_IS_CLASS
- #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION
- // This is actually the conforming implementation which works with
- // abstract classes. However, enough compilers have trouble with
- // it that most will use the one in
- // boost/type_traits/object_traits.hpp. This implementation
- // actually works with VC7.0, but other interactions seem to fail
- // when we use it.
- // is_class<> metafunction due to Paul Mensonides
- // (leavings@attbi.com). For more details:
- // http://groups.google.com/groups?hl=en&selm=000001c1cc83%24e154d5e0%247772e50c%40c161550a&rnum=1
- #if defined(__GNUC__) && !defined(__EDG_VERSION__)
- template <class U> ::boost::type_traits::yes_type is_class_tester(void(U::*)(void));
- template <class U> ::boost::type_traits::no_type is_class_tester(...);
- template <typename T>
- struct is_class_impl
- {
- BOOST_STATIC_CONSTANT(bool, value =
- sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type)
- && ! ::boost::is_union<T>::value
- );
- };
- #else
- template <typename T>
- struct is_class_impl
- {
- template <class U> static ::boost::type_traits::yes_type is_class_tester(void(U::*)(void));
- template <class U> static ::boost::type_traits::no_type is_class_tester(...);
- BOOST_STATIC_CONSTANT(bool, value =
- sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type)
- && ! ::boost::is_union<T>::value
- );
- };
- #endif
- #else
- template <typename T>
- struct is_class_impl
- {
- BOOST_STATIC_CONSTANT(bool, value =
- ! ::boost::is_union<T>::value >::value
- && ! ::boost::is_scalar<T>::value
- && ! ::boost::is_array<T>::value
- && ! ::boost::is_reference<T>::value
- && ! ::boost::is_void<T>::value
- && ! ::boost::is_function<T>::value
- );
- };
- # endif // BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION
- # else // BOOST_IS_CLASS
- template <typename T>
- struct is_class_impl
- {
- BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_CLASS(T));
- };
- # endif // BOOST_IS_CLASS
- } // namespace detail
- template <class T> struct is_class : public integral_constant<bool, ::boost::detail::is_class_impl<T>::value> {};
- # ifdef __EDG_VERSION__
- template <class T> struct is_class<const T> : public is_class<T>{};
- template <class T> struct is_class<const volatile T> : public is_class<T>{};
- template <class T> struct is_class<volatile T> : public is_class<T>{};
- # endif
-
- } // namespace boost
- #endif // BOOST_TT_IS_CLASS_HPP_INCLUDED
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