CFDictionaryAddValue(_:_:_:)

Adds a key-value pair to a dictionary if the specified key is not already present.

Declaration

func CFDictionaryAddValue(_ theDict: CFMutableDictionary!, _ key: UnsafeRawPointer!, _ value: UnsafeRawPointer!)

theDict:
The dictionary to modify. If the dictionary is a fixed-capacity dictionary and it is full before this operation, the behavior is undefined.
key:
The key for the value to add to the dictionary—a CFType object or a pointer value. The key is retained by the dictionary using the retain callback provided when the dictionary was created, so must be of the type expected by the callback. If a key which matches key is already present in the dictionary, this function does nothing (“add if absent”).
value:
A CFType object or a pointer value to add to the dictionary. The value is retained by the dictionary using the retain callback provided when the dictionary was created, so must be of the type expected by the callback.