Re: [Gnu3dkit-dev] g3dbezier isEqualToBezier:

[Philippe C . D . Robert]

Hi,

On Tuesday, October 15, 2002, at 05:06  Uhr, Brent Gulanowski wrote:
> I am confused about this. If I am misunderstanding or ignorant of 
> OpenStep feature, please explain.
>
> G3DBezier's -isEqualToBezier: method uses NSMutableArray's 
> -isEqualToArray: method, which in turn uses the contained object's 
> class override of isEqual:. In this case, the contained class is 
> G3DVector3f, subclass of G3DTuple3f. However, G3DVector3f does not 
> override -isEqual:, instead it uses G3DTuple3f's -isEqualToTuple3f:.

The behaviour of G3DBezier is probably not correct, you are right.

> My question is, how does NSMutableArray know to use the correct 
> isEqual? Is this taken care of in the runtime somehow?

I assume it does take the wrong one (isEqual:) and thus fails when you 
change a controlpoint... But on the other hand I don't want to override 
isEqual: on the vector/tuple. So I think we should fix G3DBezier's 
implementation directly.

Anyone?

-Phil
--
Philippe C.D. Robert
http://www.nice.ch/~phip