[libc++] Disentangle std::pointer_safety
This patch gets rid of technical debt around std::pointer_safety which,
I claim, is entirely unnecessary. I don't think anybody has used
std::pointer_safety in actual code because we do not implement the
underlying garbage collection support. In fact, P2186 even proposes
removing these facilities entirely from a future C++ version. As such,
I think it's entirely fine to get rid of complex workarounds whose goals
were to avoid breaking the ABI back in 2017.
I'm putting this up both to get reviews and to discuss this proposal for
a breaking change. I think we should be comfortable with making these
tiny breaks if we are confident they won't hurt anyone, which I'm fairly
confident is the case here.
Differential Revision: https://reviews.llvm.org/D100410
NOKEYCHECK=True
GitOrigin-RevId: 49e7be2e5ba1759ae9d4ce9843ce2467cf7823a5
diff --git a/include/memory b/include/memory
index 74a430d..586bd14 100644
--- a/include/memory
+++ b/include/memory
@@ -651,12 +651,12 @@
inline constexpr bool uses_allocator_v = uses_allocator<T, Alloc>::value;
// Pointer safety
-enum class pointer_safety { relaxed, preferred, strict };
-void declare_reachable(void *p);
-template <class T> T *undeclare_reachable(T *p);
-void declare_no_pointers(char *p, size_t n);
-void undeclare_no_pointers(char *p, size_t n);
-pointer_safety get_pointer_safety() noexcept;
+enum class pointer_safety { relaxed, preferred, strict }; // since C++11
+void declare_reachable(void *p); // since C++11
+template <class T> T *undeclare_reachable(T *p); // since C++11
+void declare_no_pointers(char *p, size_t n); // since C++11
+void undeclare_no_pointers(char *p, size_t n); // since C++11
+pointer_safety get_pointer_safety() noexcept; // since C++11
void* align(size_t alignment, size_t size, void*& ptr, size_t& space);