Re: Differences between -isEqual: and -isEqualTo:?
Re: Differences between -isEqual: and -isEqualTo:?
- Subject: Re: Differences between -isEqual: and -isEqualTo:?
- From: Keith Duncan <email@hidden>
- Date: Fri, 19 Sep 2008 00:19:48 +0100
if two objects compare equal, then they must have the same hash
[...] [you] have to implement a corresponding -hash that maintains
this invariant rule.
Is there an example somewhere of what one should do to implement -hash
to reflect -isEqual:, I haven't done so in one of my classes and it
works fine. Would you just combine the -hash of the objects used to
determine -isEqual: in a logical manner, say XOR?
Keith Duncan
email@hidden, 33software.com
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