Take no action when pointers are deleted.
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NSPointerFunctionsOpaqueMemory = (2UL << 0)
This is usually the preferred memory option for holding arbitrary pointers.
This is essentially a no-op relinquish function; the acquire function is only used for copy-in operations. This option is unlikely a to be a good choice for objects.
Use Mach memory.
Use free() on removal, calloc() on copy in.
Use strong write-barriers to backing store; use garbage-collected memory on copy-in.
Uses weak read and write barriers appropriate for ARC or GC. Using NSPointerFunctionsWeakMemory object references will turn to NULL on last release.
Use weak read and write barriers; use garbage-collected memory on copyIn.
Equivalent to NSPointerFunctionsStrongMemory.
Equivalent to NSPointerFunctionsWeakMemory.
Equivalent to NSPointerFunctionsZeroingWeakMemory.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.