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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/memory/gc/declare_reachable.html below:

std::declare_reachable - cppreference.com

void declare_reachable( void* p );

(since C++11)
(removed in C++23)

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.

[edit] Parameters p - a safely-derived pointer or a null pointer [edit] Return value

(none)

[edit] Exceptions

May throw std::bad_alloc if the system cannot allocate memory required to track reachable objects.

[edit] See also

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