The memory zone in which to create the copy of the receiver.
This method exists so class objects can be used in situations where you need an object that conforms to the NSMutableCopying protocol. For example, this method lets you use a class object as a key to an NSDictionary object. You should not override this method.
Allocates a new instance of the receiving class, sends it an init message, and returns the initialized object.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.