Re: Clean Object Class Design -- Circle/Ellipse
Date: Mon, 1 Oct 2001 10:51:27 +0100
Message-ID: <9p9ddf$grq8o$1_at_ID-75294.news.dfncis.de>
"James A. Robertson" <jarober_at_mail.com> wrote in message
news:3BB73A9B.6020306_at_mail.com...
> > I find it very telling that almost every OO pundit has found it
necessary to
> > write an apologia explaining why the very real and natural
subtype/supertype
> > relationship between circle and ellipse does not apply in OO.
> I find it telling that you worry about this at all. Go do some system
> development and see how often this problem actually arises.
The "problem" has arisen on virtually every system I've ever worked on using
OO
techniques (10+ yrs) . Shame was it took me until last year to finally
understand how to
identify/categorise/resolve the problem (ie by seeing the recurring pattern)
without
even having to write a line of code.
Regards,
Steven Perryman
Received on Mon Oct 01 2001 - 11:51:27 CEST