On Feb 19, 2011, at 6:08 PM, Andy Lee wrote: > I just did a quick test and confirmed that you do get two different instances > with the same hash, but they are in face isEqual: to each other and hence > their presence in a set is detected, as I would expect. > > NSNumber *one = [NSNumber numberWithLongLong:1]; > NSNumber *another = [NSNumber numberWithLongLong:1]; > NSSet *set = [NSSet setWithObject:another]; > > NSLog(@"+++ one %p, hash = %ld -- another %p, hash = %ld -- is eq = %d, > contains one = %d, contains another = %d", > one, [one hash], another, [another hash], [one isEqual:another], [set > containsObject:one], [set containsObject:another]);
Whoops, actually I got the same instance using 1, presumably because NSNumber keeps a few low number instances cached. What I said above is true if I retry with 123456789. --Andy _______________________________________________ Cocoa-dev mailing list ([email protected]) 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]
