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: fac41,2c6139ce13be9980 X-Google-Attributes: gidfac41,public X-Google-Thread: f43e6,2c6139ce13be9980 X-Google-Attributes: gidf43e6,public X-Google-Thread: 1108a1,2c6139ce13be9980 X-Google-Attributes: gid1108a1,public X-Google-Thread: 103376,3d3f20d31be1c33a X-Google-Attributes: gid103376,public From: jsa@alexandria.organon.com (Jon S Anthony) Subject: Re: Safety-critical development in Ada and Eiffel Date: 1997/08/21 Message-ID: #1/1 X-Deja-AN: 265794152 Distribution: world References: <5siqrr$3of@jupiter.milkyway.org> <5smgts$p68$1@miranda.gmrc.gecm.com> <33EFCCE4.4CE0@flash.net> <5sq3fh$frg@wdl1.wdl.lmco.com> <33F9C7BD.794BDF32@eiffel.com> <33FAB260.7E0CD1D1@calfp.co.uk> Organization: PSINet Newsgroups: comp.object,comp.software-eng,comp.lang.ada,comp.lang.eiffel Date: 1997-08-21T00:00:00+00:00 List-Id: In article <33FAB260.7E0CD1D1@calfp.co.uk> Nick Leaton writes: > Robert Dewar wrote: > > [...some BM stuff...] > > you mean by "know better". If you mean do I know perfectly well that > > postconditions cannot capture this kind of specification, yes, I know > > that perfectly well -- many specifications and requirements cannot be > > formalized in any useful manner. What's really odd here is that BM does not give the impression that he understands this point. Go figure. > But who should be resposible for the error message? You have a choice > between client of print and print itself. Hint: it is not the dichotomy as you suggest. > The answer must be the client, because as the client, I may want to > handle errors in different ways. Pop up a window, or print to a console > window as two reasonable examples. That's not the point. The point is, what is expressed via the _mechanisms_ you suggest. This latter depends largely on the context of who/what is using the system (client and print together). /Jon -- Jon Anthony OMI, Belmont, MA 02178, 617.484.3383 "Nightmares - Ha! The way my life's been going lately, Who'd notice?" -- Londo Mollari