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1.4 Memory Management

We encourage the use of the following macros to ease retain and release and as a convenience for managing code which should work in both a conventional retain counting environment and one with automatic reference counting (ARC)

• ASSIGN(object,value) to assign an object variable, performing the appropriate retain/release as necessary.
• ASSIGNCOPY(object,value) to copy the value and assign it to the object.
• DESTROY(object) to release an object variable and set it to nil.
• ENTER_POOL and LEAVE_POOL to bracket statements which should be performed inside their own auutorlease context.