| // (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 |