On Thu, Sep 18, 2008 at 4:19 PM, Keith Duncan <[EMAIL PROTECTED]> wrote: >> 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?
The only requirement is that if [objectA isEqual:objectB] returns true then [objectA hash] == [objectB hash] must be true as well. -Shawn _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
