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[libc++] Revert to previous implementation of __has_rebind

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The new implementation introduced in 5b1e5b43 broke the bot running GCC 5.
This commit is contained in:
Louis Dionne
2020-03-04 13:54:58 -05:00
parent 1044ee827a
commit 30cbdcb5c3
1 changed files with 9 additions and 5 deletions
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14
libcxx/include/memory
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@@ -841,12 +841,16 @@ struct __pointer_traits_difference_type<_Ptr, true>
typedef _LIBCPP_NODEBUG_TYPE typename _Ptr::difference_type type;
};
template <class _Tp, class _Up, class = void>
struct __has_rebind : false_type {};
template <class _Tp, class _Up>
struct __has_rebind<_Tp, _Up,
typename __void_t<typename _Tp::template rebind<_Up> >::type> : true_type {};
struct __has_rebind
{
private:
struct __two {char __lx; char __lxx;};
template <class _Xp> static __two __test(...);
template <class _Xp> static char __test(typename _Xp::template rebind<_Up>* = 0);
public:
static const bool value = sizeof(__test<_Tp>(0)) == 1;
};
template <class _Tp, class _Up, bool = __has_rebind<_Tp, _Up>::value>
struct __pointer_traits_rebind