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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2976 91177308-0d34-0410-b5e6-96231b3b80d8
50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
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// Hinnant & John Maddock 2000-2002. Permission to copy, use,
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// modify, sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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//
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// See http://www.boost.org for most recent version including documentation.
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//
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#ifndef BOOST_TYPE_TRAITS_IS_CLASS_HPP
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# define BOOST_TYPE_TRAITS_IS_CLASS_HPP
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# if (defined(__MWERKS__) && __MWERKS__ >= 0x3000) || defined(BOOST_MSVC) && _MSC_FULL_VER > 13012108 || defined(BOOST_NO_COMPILER_CONFIG)
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# ifndef BOOST_ICE_TYPE_TRAITS_HPP
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# include <boost/type_traits/ice.hpp>
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# endif
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# define BOOST_TYPE_TRAITS_IS_CLASS_DEFINED
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namespace boost {
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template <typename T>
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struct is_class
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{
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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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private:
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template <class U> static ::boost::type_traits::yes_type is_class_helper(void(U::*)(void));
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template <class U> static ::boost::type_traits::no_type is_class_helper(...);
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public:
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BOOST_STATIC_CONSTANT(
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bool, value = sizeof(
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is_class_helper<T>(0)
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) == sizeof(::boost::type_traits::yes_type));
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};
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}
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# else // nonconforming compilers will use a different impelementation, in object_traits.hpp
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# endif // nonconforming implementations
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#endif // BOOST_TYPE_TRAITS_IS_CLASS_HPP
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