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Article:
  Memory Management in Objective-C
Subject:   Really good treatment
Date:   2001-07-28 19:50:32
From:   chaoswerks
Response to: Really good treatment

Here's a simple guide for retain or copy. Use retain when the object represents a relationship. Use copy when the object represents a value. The difference is this: in a relationship, if the object pointed to changes, you want your variable to reflect this change of state; whereas, with a value, you want the value to remain unaltered if the original object changes unless you explicitly alter your copy.