Re: LSP Was: Mixing OO and DB
Date: Sun, 24 Feb 2008 10:55:18 +0000
Daniel T. wrote:
> In article <fpmn2j$va9$1_at_aioe.org>, S Perryman <q_at_q.com> wrote:
>>Bob Badour wrote:
>>Here is the apocrypthal Circle/Ellipse problem as would be specified in >>Liskov/Wing notions :
> Oh snore. You explicitly define your types so you know they won't be
> substitutable and then... Surprise!
- Don't be a fool Daniel. I have defined the types *exactly* how the aprocypthal example has been presented in debate for ages. So a straw-man argument there.
- If you actually understand the Liskov/Wing definitions, then you will know that the Circle type is substitutable for Ellipse. But Circle is not a *Liskov/Wing* subtype of Ellipse.
Steven Perryman Received on Sun Feb 24 2008 - 11:55:18 CET