A prototype for a function callback that provides a description of the data pointed to by the
info field. In implementing this function, return a reference to a CFString object that describes your allocator, particularly some characteristics of your program-defined data. You may set this function pointer to
NULL, in which case Core Foundation will provide a rudimentary description.
- iOS 2.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation