From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fac41,9a0ff0bffdf63657 X-Google-Attributes: gidfac41,public X-Google-Thread: 1108a1,9a0ff0bffdf63657 X-Google-Attributes: gid1108a1,public X-Google-Thread: 103376,4b06f8f15f01a568 X-Google-Attributes: gid103376,public X-Google-Thread: f43e6,9a0ff0bffdf63657 X-Google-Attributes: gidf43e6,public From: Patrick Logan Subject: Re: Which wastes more time? (Was Re: Software landmines (loops)) Date: 1998/09/05 Message-ID: #1/1 X-Deja-AN: 388091892 References: <6sbuod$fra$1@hirame.wwa.com> <6sebjr$b69$1@nnrp1.dejanews.com> <6sff74$q0s@gurney.reilly.home> <6sh2j5$jnl$1@nnrp1.dejanews.com> <35EC2E5A.16DB6CB1@bigfoot-.com> <6sjc0a$1lk$3@news.indigo.ie> <35EFB09E.15412933@s054.aone.net.au> <35f2bd98.40599408@news.erols.com> <35F06A58.F968BDE1@s054.aone.net.au> <35f48276.90997557@news.erols.com> <35F0C3C9.D1E56FF3@s054.aone.net.au> Organization: Teleport - Portland's Public Access (503) 220-1016 NNTP-Posting-Date: Sat, 05 Sep 1998 00:09:45 PDT Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.lang.ada Date: 1998-09-05T00:00:00+00:00 List-Id: In comp.object Loryn Jenkins wrote: : if I recall correctly, Bertrand has class CAR_OWNER inherit from class : PERSON. (He offers this as an example of 'how to do inheritance well'.) : I can't believe it is acceptable because it does not model our : concept of reality. The way I explain my objection to this inheritance relationship is that the design may be too rigid for the requirements. Rather than assume I share some concept of reality with the customer, I would ask the customer if the system must responsible for tracking people that become car owners and people who stop being car owners. Even if the customer says no, I would still lean toward supporting that possibility in teh future. So my concept of reality led me to question the requirements. The requirements led me to challenge the design. I am not out to model reality in my design. I am out to fulfill the requirements. -- Patrick Logan (H) mailto:plogan@teleport.com (W) mailto:patrickl@gemstone.com http://www.gemstone.com