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Removed unneeded boost implementation of is_base_of 

llvm-svn: 140014
This commit is contained in:
Howard Hinnant 2011-09-19 13:19:31 +00:00
parent b83e3eb37d
commit cdcfbf26dc
1 changed files with 1 additions and 45 deletions
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46
libcxx/include/type_traits
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@ -733,51 +733,7 @@ struct _LIBCPP_VISIBLE is_base_of
#else // __has_feature(is_base_of)
// (C) Copyright Rani Sharoni 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.
template <class _Bp, class _Dp>
struct __is_base_of_tests
{
template <class _Tp>
static char __test(const volatile _Dp*, _Tp);
static __two __test(const volatile _Bp*, int);
};
template <class _Bp, class _Dp>
struct __is_base_of_imp
{
struct __host
{
operator const volatile _Bp*() const;
operator const volatile _Dp*();
};
static const size_t __complete_check = sizeof(_Dp);
static const bool value = sizeof(__is_base_of_tests<_Bp, _Dp>::__test(__host(), 0)) == 1;
};
template <class _Bp, class _Dp, bool = is_class<_Bp>::value,
bool = is_class<_Dp>::value,
bool = is_same<_Bp, _Dp>::value>
struct __libcpp_base_of : public false_type {};
template <class _Bp, class _Dp>
struct __libcpp_base_of<_Bp, _Dp, true, true, true> : public true_type {};
template <class _Bp, class _Dp>
struct __libcpp_base_of<_Bp, _Dp, true, true, false>
: public integral_constant<bool, __is_base_of_imp<_Bp, _Dp>::value> {};
template <class _Bp, class _Dp>
struct _LIBCPP_VISIBLE is_base_of
: public __libcpp_base_of<typename remove_cv<_Bp>::type, typename remove_cv<_Dp>::type>
{
};
#error is_base_of not implemented.
#endif // __has_feature(is_base_of)