CFNumberCreateNULL
CFNumberCreateNULL is a function provided by the Core Foundation framework in Apple's operating systems, including macOS, iOS, watchOS, and tvOS. Its primary purpose is to create a special type of CFNumber object that represents a null value. This is distinct from other numerical types that CFNumber can represent, such as integers or floating-point numbers.
When you call CFNumberCreateNULL, it returns a reference to a CFNumber object that has no specific numerical
The returned object is a singleton, meaning that all calls to CFNumberCreateNULL will return the same underlying