Re: Question regarding class / subclass

[Robert Steely <robsteely at nc dot rr dot com>]

On Jun 23, 2004, at 2:55 PM, Frank C wrote:

> > Can I declare the array to be of type "Object3D" and have it 
> > reference various subclasses of Object3D?
> Technically that will work, but you may find yourself doing a lot of 
> type casting to get at your subclass data, and that can be expensive 
> if it happens for a lot of objects every frame.
Well, the use of "IsA" occurs at runtime, but the typecasts themselves 
are only used to override the compiler's type checking at compile time 
and thus would not impact execution speed. Of course, the code would 
take longer to enter and would be harder to read because of all the 
casts.  Or am I missing something here?  Is "IsA" *that* slow?
Bob

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