From: jsa@alexandria.organon.com (Jon S Anthony)
Subject: Re: Design By Contract
Date: 1997/09/04
Date: 1997-09-04T00:00:00+00:00 [thread overview]
Message-ID: <JSA.97Sep4173515@alexandria.organon.com> (raw)
In-Reply-To: EFzLn7.481@ecf.toronto.edu
In article <EFzLn7.481@ecf.toronto.edu> doylep@ecf.toronto.edu (Patrick Doyle) writes:
> >mechanism is clearly "simpler". b) can be done at a certain level via
> >appropriate combination of public/private children, but it is not as
> >encompassing as selective export. Then again, I've never had the
> >experience where this extra selectivity would have been useful.
>
> I had an experience where selective export was really useful. I was
> writing a circuit simulator, and I was using the builder pattern to
> decouple the representation of the circuit from its construction. I
> created features to add components and join them with wires.
>
> Then there was a CIRCUIT_SIMULATOR class which managed the event
> queue for a circuit. It needed the ability to cause the circuit to
> enact events, but I didn't want the builder to be able to enact
> events because a) the circuit is not complete and b) the output
> channel for the results of the simulation is not yet ready.
>
> Thus, I exported the circuit's enact_event feature to CIRCUIT_SIMULATOR
> and solved that problem in a very straightforward way.
Yes, but this is a good example of something that private children are
intended for and which is straightforward to achieve with them. It is
not a counter example to the "extra selectivity" capability of
selective export.
/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:[~1997-09-04 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>
1997-08-27 0:00 ` Design By Contract Ted Velkoff
[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] ` <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] ` <349224633wnr@eiffel.demon.co.uk>
1997-08-27 0:00 ` Design by Contract Robert Dewar
1997-08-29 0:00 ` Don Harrison
[not found] ` <EFM140.Fy9@syd.csa.com.au>
1997-08-28 0:00 ` Design By Contract Jon S Anthony
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>
[not found] ` <EFzLn7.481@ecf.toronto.edu>
1997-09-04 0:00 ` Jon S Anthony [this message]
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 ` W. Wesley Groleau x4923
1997-09-09 0:00 ` Veli-Pekka Nousiainen
1997-09-09 0:00 ` Veli-Pekka Nousiainen
1997-09-09 0:00 ` Jon S Anthony
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 ` Paul Johnson
1997-09-14 0:00 ` Robert Dewar
1997-09-14 0:00 ` Robert Dewar
1997-09-14 0:00 ` Robert Dewar
1997-09-15 0:00 ` John G. Volan
1997-09-12 0:00 ` Jon S Anthony
1997-09-12 0:00 ` Robert Dewar
1997-09-16 0:00 ` Brian Rogoff
1997-09-10 0:00 ` Paul Johnson
1997-09-10 0:00 ` Matthew Heaney
1997-09-10 0:00 ` Darren New
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] ` <EFz0pD.E6n@syd.csa.com.au>
1997-09-05 0:00 ` W. Wesley Groleau x4923
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
1997-09-11 0:00 ` subjectivity Don Harrison
1997-09-10 0:00 ` subjectivity W. Wesley Groleau x4923
[not found] ` <JSA.97Sep4172912@alexandria.organon.com>
[not found] ` <EG0oz8.F6M@syd.csa.com.au>
[not found] ` <EG0rp7.GtL@syd.csa.com.au>
1997-09-05 0:00 ` Design By Contract Matthew Heaney
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
1997-09-09 0:00 ` Robert A Duff
1997-09-09 0:00 ` Matthew Heaney
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
1997-08-28 0:00 ` Robert Dewar
1997-08-29 0:00 ` Don Harrison
[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
[not found] ` <JSA.97Aug26151833@alexandria.organon.com>
1997-08-27 0:00 ` Patrick Doyle
1997-08-25 0:00 ` 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] ` <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 ` Ted Velkoff
1997-08-27 0:00 ` Matt Kennel (Remove 'NOSPAM' to reply)
[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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