Read this document:

http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Concepts/ObjectOwnership.html#//apple_ref/doc/uid/20000043-BEHDEDDB

Then read this one:

http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Tasks/MemoryManagementRules.html

If you are just starting out, don't look for any patterns, just follow
the rules.

If you take ownership of an object, and want to return it and have
nothing more to do with it, you need to relinquish ownership.  But if
you just send it -release then it might go away before the caller gets
it back, which is why -autorelease exists.

--Kyle Sluder
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