CFMutableSet manages dynamic sets. The basic interface for managing sets is provided by CFSet. CFMutableSet adds functions to modify the contents of a set.

You create a mutable set object using either the CFSetCreateMutable or CFSetCreateMutableCopy function.

CFMutableSet provides several functions for adding and removing values from a set. The CFSetAddValue function adds a value to a set and CFSetRemoveValue removes a value from a set.

CFMutableSet is “toll-free bridged” with its Cocoa Foundation counterpart, NSMutableSet. What this means is that the Core Foundation type is interchangeable in function or method calls with the bridged Foundation object. This means that in a method where you see an NSMutableSet * parameter, you can pass in a CFMutableSetRef, and in a function where you see a CFMutableSetRef parameter, you can pass in an NSMutableSet instance. This also applies to concrete subclasses of NSMutableSet. See Toll-Free Bridged Types for more information on toll-free bridging.


CFMutableSet Miscellaneous Functions


Adds a value to a CFMutableSet object.


Creates an empty CFMutableSet object.


Creates a new mutable set with the values from another set.


Removes all values from a CFMutableSet object.


Removes a value from a CFMutableSet object.


Replaces a value in a CFMutableSet object.


Sets a value in a CFMutableSet object.

Data Types


A reference to a mutable set object.

See Also

Opaque Types


The CFFileDescriptor provides an opaque type to monitor file descriptors for read and write activity via CFRunLoop.


CFStringTokenizer allows you to tokenize strings into words, sentences or paragraphs in a language-neutral way. It supports languages such as Japanese and Chinese that do not delimit words by spaces, as well as de-compounding German compounds. You can obtain Latin transcription for tokens. It also provides language identification API.