std::pointer_safety

Defined in header `<memory>`
enum class pointer_safety { relaxed, preferred, strict };		(since C++11) (removed in C++23)

The scoped enumeration type pointer_safety lists the pointer safety modes supported by C++.

`pointer_safety::strict`	Only safely-derived pointers (pointers to objects allocated with new or subobjects thereof) may be dereferenced or deallocated. Garbage collector may be active.
`pointer_safety::preferred`	All pointers are considered valid and may be dereferenced or deallocated. A reachability-based leak detector may be active.
`pointer_safety::relaxed`	All pointers are considered valid and may be dereferenced or deallocated.