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