// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
-// Hinnant & John Maddock 2000-2002. Permission to copy, use,
-// modify, sell and distribute this software is granted provided this
-// copyright notice appears in all copies. This software is provided
-// "as is" without express or implied warranty, and with no claim as
-// to its suitability for any purpose.
+// 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 for most recent version including documentation.
-//
-#ifndef BOOST_TYPE_TRAITS_IS_CLASS_HPP
-# define BOOST_TYPE_TRAITS_IS_CLASS_HPP
+// See http://www.boost.org/libs/type_traits for most recent version including documentation.
-# if (defined(__MWERKS__) && __MWERKS__ >= 0x3000) || defined(BOOST_MSVC) && _MSC_FULL_VER > 13012108 || defined(BOOST_NO_COMPILER_CONFIG)
-# ifndef BOOST_ICE_TYPE_TRAITS_HPP
-# include <boost/type_traits/ice.hpp>
-# endif
-# define BOOST_TYPE_TRAITS_IS_CLASS_DEFINED
+#ifndef BOOST_TT_IS_CLASS_HPP_INCLUDED
+#define BOOST_TT_IS_CLASS_HPP_INCLUDED
+
+#include <boost/type_traits/config.hpp>
+#include <boost/type_traits/intrinsics.hpp>
+#ifndef BOOST_IS_CLASS
+# include <boost/type_traits/is_union.hpp>
+# include <boost/type_traits/detail/ice_and.hpp>
+# include <boost/type_traits/detail/ice_not.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
+
+#ifdef __EDG_VERSION__
+# include <boost/type_traits/remove_cv.hpp>
+#endif
+
+// should be the last #include
+#include <boost/type_traits/detail/bool_trait_def.hpp>
+
namespace boost {
-template <typename T>
-struct is_class
-{
- // 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.
+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
- private:
- template <class U> static ::boost::type_traits::yes_type is_class_helper(void(U::*)(void));
- template <class U> static ::boost::type_traits::no_type is_class_helper(...);
- public:
- BOOST_STATIC_CONSTANT(
- bool, value = sizeof(
- is_class_helper<T>(0)
- ) == sizeof(::boost::type_traits::yes_type));
+#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 =
+ (::boost::type_traits::ice_and<
+ sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type),
+ ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value
+ >::value)
+ );
};
-}
-# else // nonconforming compilers will use a different impelementation, in object_traits.hpp
+#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 =
+ (::boost::type_traits::ice_and<
+ sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type),
+ ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value
+ >::value)
+ );
+};
+
+#endif
+
+#else
+
+template <typename T>
+struct is_class_impl
+{
+# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+ BOOST_STATIC_CONSTANT(bool, value =
+ (::boost::type_traits::ice_and<
+ ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value,
+ ::boost::type_traits::ice_not< ::boost::is_scalar<T>::value >::value,
+ ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value,
+ ::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value,
+ ::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value,
+ ::boost::type_traits::ice_not< ::boost::is_function<T>::value >::value
+ >::value));
+# else
+ BOOST_STATIC_CONSTANT(bool, value =
+ (::boost::type_traits::ice_and<
+ ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value,
+ ::boost::type_traits::ice_not< ::boost::is_scalar<T>::value >::value,
+ ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value,
+ ::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value,
+ ::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value
+ >::value));
+# endif
+};
+
+# 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
+
+# ifdef __EDG_VERSION__
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+ is_class,T, boost::detail::is_class_impl<typename boost::remove_cv<T>::type>::value)
+# else
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_class,T,::boost::detail::is_class_impl<T>::value)
+# endif
+
+} // namespace boost
-# endif // nonconforming implementations
+#include <boost/type_traits/detail/bool_trait_undef.hpp>
-#endif // BOOST_TYPE_TRAITS_IS_CLASS_HPP
+#endif // BOOST_TT_IS_CLASS_HPP_INCLUDED
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