Notes

"Toll-free bridging" indicates that two data types are interchangeable to some degree. For example, CFDictionary Reference declares the CFDictionary and NSDictionary are toll-free bridged. That means that their methods and functions are equivalent. A pointer to one can be used as a pointer (reference) to the other. The memory management calls for release and autorelease are also equivalent.

There is a table of equivalent types here.