From: jsa@organon.com (Jon S Anthony)
Subject: Re: Real OO
Date: 1996/04/09
Date: 1996-04-09T00:00:00+00:00 [thread overview]
Message-ID: <JSA.96Apr9125305@organon.com> (raw)
In-Reply-To: DpBsG4.MIE@assip.csasyd.oz
In article <4kbqun$iiv@watnews1.watson.ibm.com> ncohen@watson.ibm.com (Norman H. Cohen) writes:
> What does Eiffel do in the case of a call like
> A.Corresponding_Parts_Equal(B) where A and B have different dynamic
> types, but the version of Corresponding_Parts_Equal for the dynamic type
> of A expects the parameter to be of (or descendended from) the dynamic
> type of Current?
>
> Some possible answers:
>
> (a) It is impossible to write a routine that has such expectations.
> [If so, Eiffel is less flexible than Ada.]
> (b) The Eiffel translator magically deduces an algorithm for
> Corresponding_Parts_Equal that works for the two dynamic types in
> question.
> [If so, we can stop this discussion now, I'm sold on Eiffel!]
> (c) A run-time error results immediately.
> [If so, no different from Ada.]
> (d) The version of Corresponding_Parts_Equal for the dynamic type of A is
> invoked with a parameter that does not have the expected dynamic
> type. Depending on the algorithm for that version of the routine,
> this may lead indirectly to a run-time error later, or fortuitously
> happen to give the right answer (at least for all the cases we tested
> so far ;-) ), or give an incorrect answer masquerading as a correct
> answer.
> [In any of these cases, Ada is more robust.]
>
> Please enlighten us.
You forgot about the Eiffel system validity check - a link time thing.
See ETL 22.4-22.9. 22.9 in particular has a lot of info for an
implementor. Unfortunately as is known in Eiffel circles this is a
rather notorious area and many implementations just "give up"...
/Jon
--
Jon Anthony
Organon Motives, Inc.
1 Williston Road, Suite 4
Belmont, MA 02178
617.484.3383
jsa@organon.com
next prev parent reply other threads:[~1996-04-09 0:00 UTC|newest]
Thread overview: 218+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4id031$cf9@dayuc.dayton.saic.com>
1996-03-18 0:00 ` Real OO Norman H. Cohen
1996-03-18 0:00 ` The Right Reverend Colin James III
1996-03-19 0:00 ` Norman H. Cohen
1996-03-20 0:00 ` Norman Cohen giving IBM a bad name The Right Reverend Colin James III
1996-03-20 0:00 ` Dave Retherford
1996-03-20 0:00 ` Brian & Karen Bell
1996-03-20 0:00 ` Colin James III giving humans a bad name (was Re: Norman Cohen giving IBM a bad name) David Emery
1996-03-20 0:00 ` Mark R Okern - F95
1996-03-20 0:00 ` Real OO John G. Volan
1996-03-21 0:00 ` Scott Leschke
1996-03-21 0:00 ` Robert A Duff
1996-03-21 0:00 ` Norman H. Cohen
1996-03-22 0:00 ` Don Harrison
1996-03-21 0:00 ` Colin James III giving humans a bad name (was Re: Norman Cohen giving IBM a bad name) Richard A. O'Keefe
1996-03-21 0:00 ` Robert Dewar
1996-03-20 0:00 ` Real OO Dale Stanbrough
1996-03-21 0:00 ` Richard Pitre
1996-03-21 0:00 ` Norman Cohen giving IBM a bad name Kent Mitchell
1996-03-22 0:00 ` Robert Munck
1996-03-22 0:00 ` Mark Brennan
1996-03-22 0:00 ` David Curry
1996-03-23 0:00 ` Tom Reid
1996-03-21 0:00 ` Real OO Don Harrison
1996-03-21 0:00 ` Colin James III giving humans a bad name (was Re: Norman Cohen giving IBM a bad name) Ulrich Windl
1996-03-20 0:00 ` Real OO Don Harrison
1996-03-22 0:00 ` Don Harrison
1996-03-22 0:00 ` Norman H. Cohen
1996-03-27 0:00 ` Don Harrison
1996-03-27 0:00 ` Norman H. Cohen
1996-03-28 0:00 ` Jacob Gore
1996-04-04 0:00 ` Don Harrison
1996-04-04 0:00 ` Laurent Guerby
1996-04-04 0:00 ` Robb Nebbe
1996-04-04 0:00 ` Jon S Anthony
1996-04-04 0:00 ` Tucker Taft
1996-04-04 0:00 ` Tucker Taft
1996-04-12 0:00 ` Don Harrison
1996-04-12 0:00 ` Don Harrison
1996-04-15 0:00 ` Robert I. Eachus
1996-04-19 0:00 ` Don Harrison
1996-04-19 0:00 ` Matt Kennel
1996-04-20 0:00 ` Bob Hathaway
1996-04-23 0:00 ` Don Harrison
1996-03-22 0:00 ` Norman H. Cohen
1996-03-26 0:00 ` Don Harrison
1996-03-26 0:00 ` Norman H. Cohen
1996-03-29 0:00 ` Don Harrison
1996-03-27 0:00 ` Thomas Beale
1996-03-28 0:00 ` Don Harrison
1996-03-23 0:00 ` Joachim Durchholz
1996-03-26 0:00 ` Norman H. Cohen
1996-04-04 0:00 ` Don Harrison
1996-04-04 0:00 ` Jon S Anthony
1996-04-12 0:00 ` Don Harrison
1996-04-17 0:00 ` Jon S Anthony
1996-04-19 0:00 ` Don Harrison
1996-04-19 0:00 ` Jon S Anthony
1996-04-23 0:00 ` Don Harrison
1996-04-24 0:00 ` Don Harrison
1996-04-29 0:00 ` Jon S Anthony
1996-04-30 0:00 ` Robert Dewar
1996-04-30 0:00 ` Amit Patel
1996-04-30 0:00 ` Robert A Duff
1996-05-07 0:00 ` Amit Patel
1996-05-01 0:00 ` Norman H. Cohen
1996-05-01 0:00 ` Colin James III (The Rt Rev'd)
1996-05-07 0:00 ` Amit Patel
1996-04-30 0:00 ` Robert A Duff
1996-04-30 0:00 ` Amit Patel
1996-04-30 0:00 ` Robert Dewar
1996-05-01 0:00 ` Richard Bielak
1996-05-01 0:00 ` Adam Beneschan
1996-05-02 0:00 ` Ell
1996-05-01 0:00 ` AdaWorks
1996-05-01 0:00 ` Don Harrison
1996-05-01 0:00 ` David Hopwood
1996-05-03 0:00 ` Don Harrison
1996-05-01 0:00 ` Don Harrison
1996-05-02 0:00 ` Robert A Duff
1996-05-03 0:00 ` Don Harrison
1996-05-03 0:00 ` Robert A Duff
1996-05-06 0:00 ` Don Harrison
1996-05-06 0:00 ` Robert A Duff
1996-05-06 0:00 ` Robb Nebbe
1996-05-02 0:00 ` Robert A Duff
1996-05-03 0:00 ` Don Harrison
1996-05-10 0:00 ` Don Harrison
1996-05-08 0:00 ` Joachim Durchholz
1996-05-03 0:00 ` Don Harrison
1996-05-03 0:00 ` Dave Fitch
1996-05-07 0:00 ` Jon S Anthony
1996-04-30 0:00 ` Joachim Durchholz
1996-04-30 0:00 ` Jon S Anthony
1996-05-01 0:00 ` Matt Kennel
1996-05-03 0:00 ` Don Harrison
1996-05-02 0:00 ` Don Harrison
1996-05-02 0:00 ` Jon S Anthony
1996-05-03 0:00 ` Don Harrison
1996-05-06 0:00 ` Jon S Anthony
1996-05-02 0:00 ` Robert I. Eachus
1996-05-06 0:00 ` Jon S Anthony
1996-05-06 0:00 ` Don Harrison
1996-05-06 0:00 ` Don Harrison
1996-05-07 0:00 ` Jon S Anthony
1996-05-13 0:00 ` Don Harrison
1996-05-09 0:00 ` Jon S Anthony
1996-04-19 0:00 ` Multiple Dispatch in Ada 95 (Was Re: Real OO) Brian Rogoff
1996-04-21 0:00 ` Brian Rogoff
1996-04-19 0:00 ` Robert I. Eachus
1996-04-20 0:00 ` Brian Rogoff
1996-04-21 0:00 ` Robert A Duff
1996-04-24 0:00 ` Real OO Joachim Durchholz
1996-05-01 0:00 ` Matt Kennel
1996-05-02 0:00 ` Don Harrison
1996-05-07 0:00 ` Joachim Durchholz
1996-05-08 0:00 ` Jon S Anthony
1996-05-09 0:00 ` Robert I. Eachus
1996-04-30 0:00 ` Jon S Anthony
1996-05-03 0:00 ` Don Harrison
1996-05-07 0:00 ` Jon S Anthony
1996-04-30 0:00 ` Joachim Durchholz
1996-05-08 0:00 ` Joachim Durchholz
1996-05-10 0:00 ` Jon S Anthony
1996-05-02 0:00 ` Jon S Anthony
1996-05-06 0:00 ` Jon S Anthony
1996-04-08 0:00 ` Norman H. Cohen
1996-04-08 0:00 ` Robert A Duff
1996-04-09 0:00 ` Norman H. Cohen
1996-04-10 0:00 ` Don Harrison
1996-04-11 0:00 ` Jacob Gore
1996-04-12 0:00 ` Don Harrison
1996-04-12 0:00 ` Jacob Gore
1996-04-16 0:00 ` Don Harrison
1996-04-12 0:00 ` Don Harrison
1996-04-12 0:00 ` Jon S Anthony
1996-04-13 0:00 ` Robert A Duff
1996-04-12 0:00 ` Matt Kennel
1996-04-15 0:00 ` Don Harrison
1996-04-16 0:00 ` Jon S Anthony
1996-04-09 0:00 ` Valery CROIZIER
1996-04-09 0:00 ` Jon S Anthony [this message]
1996-04-09 0:00 ` Joachim Durchholz
1996-05-02 0:00 ` Joachim Durchholz
1996-05-05 0:00 ` Robert A Duff
1996-05-05 0:00 ` Robert Dewar
1996-05-06 0:00 ` Norman H. Cohen
1996-05-07 0:00 ` Ada terminology (was Re: Real OO) David Hopwood
1996-05-07 0:00 ` The Right Reverend Colin James III
1996-05-07 0:00 ` Tucker Taft
1996-05-07 0:00 ` The Right Reverend Colin James III
1996-05-08 0:00 ` bill.williams
1996-05-07 0:00 ` Dave Jones
1996-05-07 0:00 ` Real OO Don Harrison
1996-05-07 0:00 ` Jon S Anthony
1996-05-08 0:00 ` Don Harrison
1996-05-08 0:00 ` Norman H. Cohen
1996-05-08 0:00 ` Robert A Duff
1996-05-10 0:00 ` Matt Kennel
1996-05-10 0:00 ` Robert A Duff
1996-05-14 0:00 ` Matt Kennel
1996-05-15 0:00 ` Robert A Duff
1996-05-07 0:00 ` Amit Patel
1996-05-07 0:00 ` The Right Reverend Colin James III
1996-05-08 0:00 ` Don Harrison
1996-05-08 0:00 ` Juergen Schlegelmilch
[not found] ` <Dr4538.D27@assip.csasyd.oz>
1996-05-09 0:00 ` Juergen Schlegelmilch
1996-05-09 0:00 ` Richard Riehle
1996-05-10 0:00 ` Tucker Taft
1996-05-13 0:00 ` Don Harrison
1996-05-13 0:00 ` Tucker Taft
1996-05-14 0:00 ` Don Harrison
1996-05-14 0:00 ` Steve Tynor
1996-05-14 0:00 ` Robert A Duff
1996-05-15 0:00 ` Don Harrison
1996-05-14 0:00 ` Robert A Duff
1996-05-15 0:00 ` Steve Tynor
1996-05-15 0:00 ` Robert A Duff
1996-05-16 0:00 ` James McKim
1996-05-18 0:00 ` Matt Kennel
1996-05-20 0:00 ` James McKim
1996-05-22 0:00 ` Matt Kennel
1996-05-14 0:00 ` Joachim Durchholz
1996-05-14 0:00 ` Roger Browne
1996-05-15 0:00 ` Alexander Kjeldaas
1996-05-15 0:00 ` Steve Tynor
1996-05-19 0:00 ` Piercarlo Grandi
1996-05-14 0:00 ` James McKim
1996-05-15 0:00 ` Juergen Schlegelmilch
1996-05-20 0:00 ` Joachim Durchholz
1996-05-07 0:00 ` Joachim Durchholz
1996-05-09 0:00 ` Don Harrison
1996-05-09 0:00 ` Joachim Durchholz
1996-05-09 0:00 ` Jon S Anthony
1996-04-02 0:00 ` Detecting type mismatch at compile time (was Re: Real OO) Robert I. Eachus
1996-04-03 0:00 ` Richard Bielak
1996-04-04 0:00 ` Don Harrison
1996-03-28 0:00 ` Real OO Joachim Durchholz
1996-03-29 0:00 ` Norman H. Cohen
1996-03-30 0:00 ` John G. Volan
1996-03-26 0:00 ` Jon S Anthony
1996-03-29 0:00 ` Joachim Durchholz
1996-04-04 0:00 ` Don Harrison
1996-04-04 0:00 ` Dominique Colnet
1996-04-04 0:00 ` Steve Tynor
1996-04-08 0:00 ` Norman H. Cohen
1996-04-09 0:00 ` Matt Kennel
1996-04-08 0:00 ` Matt Kennel
1996-04-09 0:00 ` Norman H. Cohen
1996-04-09 0:00 ` Robert C. Martin
1996-04-10 0:00 ` J. Kanze
1996-05-02 0:00 Bob Crispen
[not found] <DoDLr7.JDB@world.std.com>
[not found] ` <4if7s5$bfk@ra.nrl.navy.mil>
[not found] ` <DoDqH4.29v@world.std.com>
1996-03-26 0:00 ` AdaWorks
1996-03-29 0:00 ` Brian Rogoff
[not found] <4hneps$1238@watnews1.watson.ibm.com>
[not found] ` <Do3F1K.4xG@assip.csasyd.oz>
[not found] ` <4i455s$ijq@watnews1.watson.ibm.com>
1996-03-15 0:00 ` Don Harrison
[not found] ` <DoBH80.9u9@world.std.com>
1996-03-15 0:00 ` Richard Pitre
1996-03-15 0:00 ` Mark A Biggar
1996-03-16 0:00 ` Des Kenny
[not found] <JSA.96Mar13143956@organon.com>
1996-03-15 0:00 ` Don Harrison
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