[libcxx] Implement std::to_address for C++20
Summary: Now implements P0653R2 - Utility to convert to raw pointer.
Reviewers: mclow.lists, EricWF
Reviewed By: EricWF
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D35470
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@318865 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/memory b/include/memory
index 888ce69..913bc85 100644
--- a/include/memory
+++ b/include/memory
@@ -46,6 +46,9 @@
static pointer pointer_to(<details>) noexcept;
};
+template <class T> constexpr T* to_address(T* p) noexcept; // C++20
+template <class Ptr> auto to_address(const Ptr& p) noexcept; // C++20
+
template <class Alloc>
struct allocator_traits
{
@@ -1090,13 +1093,14 @@
};
template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
_Tp*
__to_raw_pointer(_Tp* __p) _NOEXCEPT
{
return __p;
}
+#if _LIBCPP_STD_VER <= 17
template <class _Pointer>
inline _LIBCPP_INLINE_VISIBILITY
typename pointer_traits<_Pointer>::element_type*
@@ -1104,6 +1108,41 @@
{
return _VSTD::__to_raw_pointer(__p.operator->());
}
+#else
+template <class _Pointer>
+inline _LIBCPP_INLINE_VISIBILITY
+auto
+__to_raw_pointer(const _Pointer& __p) _NOEXCEPT
+-> decltype(pointer_traits<_Pointer>::to_address(__p))
+{
+ return pointer_traits<_Pointer>::to_address(__p);
+}
+
+template <class _Pointer, class... _None>
+inline _LIBCPP_INLINE_VISIBILITY
+auto
+__to_raw_pointer(const _Pointer& __p, _None...) _NOEXCEPT
+{
+ return _VSTD::__to_raw_pointer(__p.operator->());
+}
+
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY constexpr
+_Tp*
+to_address(_Tp* __p) _NOEXCEPT
+{
+ static_assert(!is_function_v<_Tp>, "_Tp is a function type");
+ return __p;
+}
+
+template <class _Pointer>
+inline _LIBCPP_INLINE_VISIBILITY
+auto
+to_address(const _Pointer& __p) _NOEXCEPT
+{
+ return _VSTD::__to_raw_pointer(__p);
+}
+#endif
template <class _Tp, class = void>
struct __has_size_type : false_type {};