Dan P <dan### [at] yahoocom> wrote:
> I have to disagree with this: If X derives Y, X is still X, but inherits the
> methods and members of Y. Also, Y is not an X -- for example, if Y was a
> Stream and X was a RandomAccessStream, A RandomAccessStream contains methods
> and members of a Stream, but it is still a RandomAccess Stream. A Stream is
> not a RandomAccessStream from the other way around as well so X cannot
> actually be Y.

  Then perhaps you should read some book about OO programming.

  The "is-a" relation between inherited classes is one of the fundamental
properties of object-oriented programming. If you don't understand that
then you still have much to study.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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