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
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