Re: LSP Was: Mixing OO and DB
From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Fri, 22 Feb 2008 07:53:13 -0400
Message-ID: <47beb7ab$0$4065$9a566e8b_at_news.aliant.net>
>
>>> On 2008-02-20 09:16:17 -0600, S Perryman <q_at_q.com> said:
Date: Fri, 22 Feb 2008 07:53:13 -0400
Message-ID: <47beb7ab$0$4065$9a566e8b_at_news.aliant.net>
>> Robert Martin <unclebob_at_objectmentor.com> wrote:
>
>>> On 2008-02-20 09:16:17 -0600, S Perryman <q_at_q.com> said:
[snip]
> And for practical demonstration, I can take the apocrypthal Circle/Ellipse
> problem, and show that Circle is not a Liskov/Wing subtype of Ellipse
> without ever needing to see any program that may be using Circle or Ellipse
> types.
In that case, I can only conclude you are an ignorant fool because D&D responded to L&W showing a computational model where Circle is indeed a subtype of Ellipse. Received on Fri Feb 22 2008 - 12:53:13 CET