Re: Finding out if an NSArray's contents are all equal

FROM : Adam R. Maxwell
DATE : Sat Jul 22 19:48:22 2006

On Jul 22, 2006, at 10:29, Andre wrote:

>  Ashley Clark wrote:
>

>> Check out isEqualToArray: in NSArray.

> Thanks for the response. Yea, but its only for comparing arrays to 
> arrays.
>
> What I was looking for was if all objects in an array are equal to 
> each other.
> IOW, are each and every object containing the same equivalent value 
> e.g
> an array of NSNumbers all equalling 21.0 would return YES, else NO 
> if the
> contents' NSNumber objects varied in their value...
>
> (Again, it seems apple hasn't a built-in method for this particular 
> aspect...)


It almost sounds like you want an NSSet (or maybe a CFBag)?  If you 
want to stick with array functionality, this might work in a 
category, though (untested):

CFIndex cnt = CFArrayGetCount((CFArrayRef)self);
return (cnt > 0 && CFArrayGetCountOfValue((CFArrayRef)self, 
CFRangeMake(0, cnt), (void *)[self objectAtIndex:0]) == cnt);

Adam