Ah, hmm; well in the case of them both being NSCFArray's, that does sound right; thanks :-)
What I was worried about is that maybe NSMutableArray (or any sub-class in general) would need to do some special sub-class-specific initialization, which it might not have implemented. I guess though, if you're going to be sub-classing a class, then you ought to generally make sure that all of it's static method will work on your new sub-class? There's always the danger that the super-class will have new static methods added without your knowledge though. -Patrick On Thu, Apr 8, 2010 at 10:25 AM, Dave DeLong <davedel...@me.com> wrote: > Yes, that is safe to use. It's safe to use because classes are really just > special objects, which means they get all the class method inheritance that > instances get with instance methods. This will work in every case where the > implementors have used: > > [[[self alloc] init] autorelease] //this will instantiate a new instance of > whatever class invokes this method > > Instead of > > [[[MyClass alloc] init] autorelease] //this will instantiate a new instance > of MyClass, regardless of which class invoked this method > > Just like in instance methods, class methods have an implicit "self" variable > that refers to the Class itself. > > Beyond that, NSMutableArray and NSArray are really just the same class > (NSCFArray, usually), with mutability determined by an internal flag. > > Cheers, > > Dave > > On Apr 8, 2010, at 8:20 AM, Patrick M. Rutkowski wrote: > >> Is is safe to do [NSMutableArray array], even with the "array" class >> method is actually declared as +[NSArray array]. In other words, is it >> safe to call a super-class' class method. >> >> If not, why? >> >> If so, why? And also, is it generally safe in _all_ cases, or only >> just when specifically crafted to work? >> >> Many thanks, >> -Patrick > > _______________________________________________ > > 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/rutski89%40gmail.com > > This email sent to rutsk...@gmail.com > _______________________________________________ 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
