< cpp‎ | memory
Dynamic memory management
Uninitialized storage
Garbage collection support
C Library
Low level memory management
Defined in header <memory>
void declare_reachable( void* p );
(since C++11)

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.


p - a safely-derived pointer or a null pointer

Return value



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


See also

declares that an object can be recycled
(function template)