A prototype for a function callback that provides a description of the specified data.
- iOS 2.0+
- macOS 10.0+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
An untyped pointer to program-defined data.
A CFString object that describes the allocator. The caller is responsible for releasing this object.
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.