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Showing content from https://en.cppreference.com/w/cpp/language/../memory/weak_ptr/../gc/pointer_safety.html below:

std::pointer_safety - cppreference.com

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++.

[edit] Enumeration constants Enumerator Meaning 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. [edit] See also

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