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From: kmajor@jagor.srce.hr (Kazimir Majorinc)
Newsgroups: comp.lang.beta
Subject: Ellipse - Circle dilemma in Beta?
Date: 12 Feb 1997 20:57:11 GMT
Organization: Public host at University Computing Centre, Zagreb, CROATIA
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Hello!


Do you have ELlipse Circle dilemma in Beta?

   Is someone do not know, that is problem in C++,
   described on this name in their comp.lang.c++ FAQ. 
   
   Shortly:
    
   if you make class Circle childe of class Ellipse,
   than Ellipse::SetXYoses(a,b) will be inherited in
   Circle::SetXY(a,b) what appear nonsence.
   
There are several answers on this question, and most 
constructive answers say you should not derive Circle from
Ellipse. My opinion is slightly more pesimistic: it is disaster
of C++ and many other OO languages. My question is of course,
how Beta deal with it?

My solution is that inheritance in classes should be upside down
for (simple) modifiers, because there have very different
semantic, although similar syntax. So, modifiers should be inherited
from childe to parents. I have FAQ here, but it will be easier if
someone know, is it possible with your patterns or so to make such
hierarchy. Or, in any other language, if you know.

Sincerely,
_______________________________________________
Author: Kazimir Majorinc, Zagreb, Croatia
E-mail: Kazimir.Majorinc@public.srce.hr
        kmajor@public.srce.hr (slightly better)
http:   //public.srce.hr/~kmajor (~7min to USA)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
One who knows the secret of the 7th stair