std::declare_reachable
Min standard notice:
Header: <memory>
Declares the object referenced by the pointer p reachable. Reachable objects will not be deleted by the garbage collector or considered to be a leak by a leak detector even if all pointers to it are destroyed. An object may be declared reachable multiple times, in which case multiple calls to std::undeclare_reachable would be needed to remove this property. For example, a XOR linked list needs to declare its nodes reachable if the implementation has garbage collection enabled.
# Declarations
void declare_reachable( void* p );
(since C++11) (removed in C++23)
# Parameters
p: a safely-derived pointer or a null pointer
# Return value
(none)