On Aug 29, 2008, at 12:43 PM, Keith Duncan wrote:
After all, what prevents somebody else from using 1091 too?
Nothing whatsoever. But that isn't a problem. So long as the
observation context remains internal it doesn't have to be
universally unique.
It has to be unique within an inheritance hierarchy.
The context is the only thing you use to determine if an -
observeValueForKeyPath:... was meant for you, or for one of your
superclasses.
If you use a magic number, you have no guarantee that a superclass
didn't also use the same magic number. Solution: don't use magic
numbers.
Jim
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