diff options
| -rw-r--r-- | libcxx/include/type_traits | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/libcxx/include/type_traits b/libcxx/include/type_traits index e29167f0e47..b7adfebceeb 100644 --- a/libcxx/include/type_traits +++ b/libcxx/include/type_traits @@ -396,6 +396,55 @@ template <class _Tp> struct _LIBCPP_TYPE_VIS_ONLY enable_if<true, _Tp> {typedef template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type; #endif +// addressof + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +_Tp* +addressof(_Tp& __x) _NOEXCEPT +{ + return (_Tp*)&reinterpret_cast<const volatile char&>(__x); +} + +#if defined(_LIBCPP_HAS_OBJC_ARC) && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF) +// Objective-C++ Automatic Reference Counting uses qualified pointers +// that require special addressof() signatures. When +// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler +// itself is providing these definitions. Otherwise, we provide them. +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +__strong _Tp* +addressof(__strong _Tp& __x) _NOEXCEPT +{ + return &__x; +} + +#ifdef _LIBCPP_HAS_OBJC_ARC_WEAK +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +__weak _Tp* +addressof(__weak _Tp& __x) _NOEXCEPT +{ + return &__x; +} +#endif + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +__autoreleasing _Tp* +addressof(__autoreleasing _Tp& __x) _NOEXCEPT +{ + return &__x; +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +__unsafe_unretained _Tp* +addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT +{ + return &__x; +} +#endif struct __two {char __lx[2];}; |
