Take no action when pointers are deleted.
- iOS 6.0+
- macOS 10.5+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
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.