From: jsa@alexandria.organon.com (Jon S Anthony)
Subject: Re: Design By Contract
Date: 1997/08/28
Date: 1997-08-28T00:00:00+00:00 [thread overview]
Message-ID: <JSA.97Aug28172900@alexandria.organon.com> (raw)
In-Reply-To: EFM140.Fy9@syd.csa.com.au
In article <EFM140.Fy9@syd.csa.com.au> nospam@thanks.com.au (Don Harrison) writes:
> - Strict enforcement of encapsulation while maximising visibility. Eiffel
> offers a look-but-don't-touch view of object attributes. In Ada83,
> an attribute and its type has to be declared in the visible interface in
> order for clients to see it's structure but then they can also update it
> directly. If you declare its type as private, clients can't update it
> directly but neither can they see its structure.
Isn't that exactly the point? Why should a client be able to see the
actual structure, aka implementation????
> - Simplicity which enables developers to focus on designing rather than
> trying to remember language rules. A simplistic macroscopic comparison
> of Eiffel and Ada based on the number of validity rules suggests that
> Eiffel is about 50 times simpler than Ada.
IMO, this is obviously one of those "yes it is, no it isn't" sort of
things. It would be very difficult to get a _consistent_ objective
metric for this.
/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
next prev parent reply other threads:[~1997-08-28 0:00 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-08-21 0:00 Critique of Ariane 5 paper (finally!) aek
[not found] ` <33FC66AD.9A0799D4@calfp.co.uk>
1997-08-22 0:00 ` Robert S. White
1997-08-22 0:00 ` Samuel Mize
1997-08-22 0:00 ` Samuel Mize
1997-08-23 0:00 ` Ken Garlington
[not found] ` <33FFA4B1.3543@flash.net>
1997-08-26 0:00 ` Nick Leaton
[not found] ` <3403940F.4154@pseserv3.fw.hac.com>
[not found] ` <349224633wnr@eiffel.demon.co.uk>
1997-08-27 0:00 ` Design by Contract Robert Dewar
1997-08-29 0:00 ` Don Harrison
1997-08-27 0:00 ` Design By Contract Ted Velkoff
[not found] ` <5u3c6v$gtf$2@miranda.gmrc.gecm.com>
[not found] ` <34058808.3BF@pseserv3.fw.hac.com>
1997-08-28 0:00 ` Darren New
1997-08-28 0:00 ` Patrick Doyle
1997-09-06 0:00 ` Joachim Durchholz
1997-09-06 0:00 ` Patrick Doyle
[not found] ` <JSA.97Aug27180328@alexandria.organon.com>
1997-08-28 0:00 ` W. Wesley Groleau x4923
1997-09-03 0:00 ` Don Harrison
1997-09-03 0:00 ` Jon S Anthony
1997-09-04 0:00 ` Don Harrison
[not found] ` <EFM140.Fy9@syd.csa.com.au>
1997-08-28 0:00 ` Robert Dewar
1997-08-29 0:00 ` Don Harrison
1997-08-28 0:00 ` Jon S Anthony [this message]
1997-08-29 0:00 ` Patrick Doyle
1997-08-29 0:00 ` Jon S Anthony
[not found] ` <EFqDw0.3x7@ecf.toronto.edu>
[not found] ` <JSA.97Aug30145354@alexandria.organon.com>
1997-09-01 0:00 ` Patrick Doyle
1997-08-29 0:00 ` Don Harrison
1997-08-29 0:00 ` Jon S Anthony
[not found] ` <EFqE8L.4Eq@ecf.toronto.edu>
[not found] ` <JSA.97Aug30145058@alexandria.organon.com>
1997-09-01 0:00 ` Patrick Doyle
1997-09-02 0:00 ` Don Harrison
1997-09-02 0:00 ` Joerg Rodemann
1997-09-02 0:00 ` Jon S Anthony
1997-09-02 0:00 ` Jon S Anthony
1997-09-03 0:00 ` Don Harrison
[not found] ` <JSA.97Sep3201329@alexandria.organon.com>
1997-09-04 0:00 ` Paul Johnson
1997-09-05 0:00 ` Jon S Anthony
[not found] ` <5un58u$9ih$1@gonzo.sun3.iaf.nl>
1997-09-06 0:00 ` Building blocks (Was: Design By Contract) Joachim Durchholz
1997-09-08 0:00 ` Paul Johnson
1997-09-08 0:00 ` Brian Rogoff
1997-09-09 0:00 ` Matthew Heaney
1997-09-09 0:00 ` W. Wesley Groleau x4923
1997-09-10 0:00 ` Robert A Duff
1997-09-12 0:00 ` Jon S Anthony
1997-09-09 0:00 ` Brian Rogoff
1997-09-10 0:00 ` Robert Dewar
1997-09-12 0:00 ` Jon S Anthony
1997-09-12 0:00 ` Robert Dewar
1997-09-16 0:00 ` Brian Rogoff
1997-09-12 0:00 ` Paul Johnson
1997-09-14 0:00 ` Robert Dewar
1997-09-14 0:00 ` Robert Dewar
1997-09-15 0:00 ` John G. Volan
1997-09-14 0:00 ` Robert Dewar
1997-09-10 0:00 ` Paul Johnson
1997-09-10 0:00 ` Matthew Heaney
1997-09-10 0:00 ` Darren New
1997-09-09 0:00 ` Veli-Pekka Nousiainen
1997-09-09 0:00 ` Jon S Anthony
1997-09-09 0:00 ` Veli-Pekka Nousiainen
1997-09-09 0:00 ` W. Wesley Groleau x4923
1997-09-08 0:00 ` Design By Contract Nick Leaton
1997-09-08 0:00 ` Matthew Heaney
1997-09-09 0:00 ` Paul Johnson
[not found] ` <EFzLn7.481@ecf.toronto.edu>
1997-09-04 0:00 ` Jon S Anthony
[not found] ` <EFz0pD.E6n@syd.csa.com.au>
1997-09-05 0:00 ` subjectivity W. Wesley Groleau x4923
1997-09-05 0:00 ` subjectivity Matthew Heaney
1997-09-10 0:00 ` subjectivity Don Harrison
1997-09-12 0:00 ` subjectivity Jon S Anthony
1997-09-16 0:00 ` subjectivity Don Harrison
1997-09-16 0:00 ` subjectivity Jon S Anthony
1997-09-10 0:00 ` subjectivity Don Harrison
1997-09-10 0:00 ` subjectivity W. Wesley Groleau x4923
1997-09-10 0:00 ` subjectivity W. Wesley Groleau x4923
1997-09-11 0:00 ` subjectivity Don Harrison
1997-09-05 0:00 ` Design By Contract W. Wesley Groleau x4923
[not found] ` <JSA.97Sep4172912@alexandria.organon.com>
[not found] ` <EG0oz8.F6M@syd.csa.com.au>
1997-09-05 0:00 ` Jon S Anthony
1997-09-05 0:00 ` Nick Leaton
1997-09-08 0:00 ` Jon S Anthony
1997-09-09 0:00 ` Nick Leaton
1997-09-10 0:00 ` Paul Johnson
1997-09-06 0:00 ` Patrick Doyle
[not found] ` <EG0rp7.GtL@syd.csa.com.au>
1997-09-05 0:00 ` Matthew Heaney
1997-09-09 0:00 ` Robert A Duff
1997-09-09 0:00 ` Matthew Heaney
[not found] ` <3406BEF7.2FC3@flash.net>
[not found] ` <3406E0F7.6FF7ED99@calfp.co.uk>
1997-09-02 0:00 ` Critique of Ariane 5 paper (finally!) Ken Garlington
[not found] <5u1627$1fak@info4.rus.uni-stuttgart.de>
[not found] ` <EFM1Lx.GD2@syd.csa.com.au>
1997-08-28 0:00 ` Design by Contract Robert Dewar
-- strict thread matches above, loose matches on Subject: below --
1997-08-07 0:00 Safety-critical development in Ada and Eiffel Ken Garlington
1997-08-12 0:00 ` Don Harrison
1997-08-12 0:00 ` Jon S Anthony
1997-08-13 0:00 ` Ted Velkoff
1997-08-13 0:00 ` Ken Garlington
1997-08-14 0:00 ` Nick Leaton
1997-08-18 0:00 ` Joachim Durchholz
1997-08-19 0:00 ` Ken Garlington
1997-08-21 0:00 ` Joachim Durchholz
1997-08-23 0:00 ` Ken Garlington
[not found] ` <JSA.97Aug25181856@alexandria.organon.com>
[not found] ` <34023A1F.41C67EA6@eiffel.com>
1997-08-25 0:00 ` Design by Contract Bertrand Meyer
1997-08-25 0:00 ` Steve Stringfellow
1997-08-26 0:00 ` Don Harrison
1997-08-25 0:00 ` Bertrand Meyer
[not found] ` <JSA.97Aug26151833@alexandria.organon.com>
1997-08-27 0:00 ` Patrick Doyle
1997-08-25 0:00 ` Bertrand Meyer
[not found] ` <3402d123.0@news.uni-ulm.de>
1997-08-26 0:00 ` Nick Leaton
[not found] ` <3402e51d.0@news.uni-ulm.de>
[not found] ` <3402E8C9.3384D976@calfp.co.uk>
[not found] ` <dewar.872631036@merv>
1997-08-27 0:00 ` Matt Kennel (Remove 'NOSPAM' to reply)
1997-08-27 0:00 ` Ted Velkoff
[not found] ` <34050F3C.5A3A@invest.amp.com.au>
1997-08-28 0:00 ` Robert Dewar
1997-08-29 0:00 ` Paul Johnson
1997-08-31 0:00 ` Matt Kennel (Remove 'NOSPAM' to reply)
1997-09-01 0:00 ` John F. Bell III
1997-09-02 0:00 ` Ken Garlington
1997-09-05 0:00 ` Robert Dewar
[not found] ` <dewar.872887402@merv>
1997-09-02 0:00 ` Ken Garlington
1997-09-03 0:00 ` Thomas Beale
[not found] ` <EFxx8q.2sw@ecf.toronto.edu>
1997-09-04 0:00 ` Thomas Beale
1997-09-05 0:00 ` Robert Dewar
1997-09-05 0:00 ` Ken Garlington
[not found] ` <340306E1.5FB64D70@XYZZYcalfp.com>
1997-08-28 0:00 ` Mark Bennison
[not found] ` <bengtk-2708972209500001@sl35.modempool.kth.se>
1997-08-28 0:00 ` Nick Leaton
1997-08-25 0:00 ` Bertrand Meyer
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