On Apr 24, 2010, at 5:50 AM, Filip van der Meeren wrote: > I want to get the difference between 2 characterSets. For example: > > I have the following 2 characterSets... > NSCharacterSet *aSet = [NSCharacterSet > characterSetWithCharactersInString:@"a"]; > NSCharacterSet *lowerSet = [NSCharacterSet lowercaseLetterCharacterSet]; > > The difference between these (aSet - lowerSet = remainder):
IIRC, this line right here gets you an empty character set, which will also give you an empty set any time you make an intersection with anything: > NSMutableCharacterSet *remainder = [[NSMutableCharacterSet alloc] init]; so this one will get the intersection between ('a') and the empty set, which will be the empty set: > [remainder formIntersectionWithCharacterSet:aSet]; and ditto for this one. Note that even if remainder started out non-empty, it wouldn’t have more than (‘a') in it after the first intersection, and since 'a' is a member of lowerSet, being a lowercase letter, intersecting with [lowerSet invertedSet] is still going to get you an empty set: > [remainder formIntersectionWithCharacterSet:[lowerSet invertedSet]]; What exactly are you trying to do? Charles_______________________________________________ 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 arch...@mail-archive.com