From: kennel@nospam.lyapunov.ucsd.edu (Matt Kennel (Remove 'NOSPAM' to reply))
Subject: Re: Interface/Implementation (was Re: Design by Contract)
Date: 1997/09/06
Date: 1997-09-06T00:00:00+00:00 [thread overview]
Message-ID: <slrn611l25.mp.kennel@lyapunov.ucsd.edu> (raw)
In-Reply-To: mheaney-ya023680000509970911020001@news.ni.net
On Fri, 05 Sep 1997 09:11:02 -0800, Matthew Heaney <mheaney@ni.net> wrote:
:Note that many computer scientists, among them Tony Hoare, believe that a
:measurement of goodness of a language is its ability to be compiled using a
:single pass.
Did he say what the sign of the 'goodness delta' for a single pass was?
Maybe it's negative? :-)
:In that tradition, Ada was design so that it could be
:compiled in a single pass.
What counts as a 'pass'?
:>Does the Ada95 standard impose dependency-related ordering?
:
:Ada was designed in the belief that the source text of a program has two
:consumers: the human reader, and the Ada compiler. As such, the Ada
:philosophy is that, when reading the code, one's understanding of the code
:should only depend on what has come before. So yes, if there is a
:dependency ordering between two subprogram bodies, then either the
:dependent body must follow the other, or a specification for the body must
:preceed the dependent body (subprogram specs can appear in the package
:body).
Wow. That is a really antideluvian mode of thought.
:That there is a dependency-related ordering in Ada (both 83 and 95) is by
:design; that was the precise intent of Ada's designers. This should be
:regarded as a Good Thing, because it makes it easier for the human reader
:to apprehend program text.
Does it, really?
Am I supposed to apprehend a whole program as if it were all dumped on
some line printer---but as if I had never read it before, like a novel?
Who would do that? Dilbert's pointy-headed-boss? :-)
In real life could I even REMEMBER which identifiers were identified when?
Or is this something that a computer can only remember perfectly?
In real life, while I'm programming, why am I supposed to have to
remember which things are "before" and "after", in some silly conflation of
location in a text document with 'time'? Assuming I don't have a single
source file, is this at all justifiable?
--
* Matthew B. Kennel/Institute for Nonlinear Science, UCSD
*
* According to California Assembly Bill 3320, it is now a criminal offense
* to solicit any goods or services by email to a CA resident without
* providing the business's legal name and complete street address.
*
next prev parent reply other threads:[~1997-09-06 0:00 UTC|newest]
Thread overview: 185+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <01bcb389$24f579d0$1c10d30a@ntwneil>
1997-08-28 0:00 ` Interface/Implementation (was Re: Design by Contract) Tucker Taft
1997-08-29 0:00 ` Paul Johnson
1997-08-29 0:00 ` Jon S Anthony
[not found] ` <EFqDC8.342@ecf.toronto.edu>
1997-09-02 0:00 ` Samuel Mize
1997-09-03 0:00 ` Patrick Doyle
1997-09-03 0:00 ` Samuel Mize
1997-09-03 0:00 ` Paul Johnson
1997-09-04 0:00 ` Erik Ernst
1997-09-05 0:00 ` Robert Dewar
[not found] ` <EFyrH2.7z2@syd.csa.com.au>
1997-09-04 0:00 ` W. Wesley Groleau x4923
1997-09-05 0:00 ` Don Harrison
1997-09-05 0:00 ` Jon S Anthony
1997-09-06 0:00 ` Fergus Henderson
1997-09-06 0:00 ` Jon S Anthony
1997-09-05 0:00 ` W. Wesley Groleau x4923
1997-09-06 0:00 ` Joachim Durchholz
1997-09-09 0:00 ` Robert Dewar
1997-09-09 0:00 ` Richard Kenner
1997-09-10 0:00 ` Tucker Taft
1997-09-10 0:00 ` Nick Leaton
1997-09-10 0:00 ` W. Wesley Groleau x4923
1997-09-11 0:00 ` Code ordering Steve Furlong
1997-09-12 0:00 ` Interface/Implementation (was Re: Design by Contract) Robert Dewar
1997-09-12 0:00 ` Nick Leaton
1997-09-10 0:00 ` One pass compilation? W. Wesley Groleau x4923
1997-09-10 0:00 ` Interface/Implementation (was Re: Design by Contract) Joachim Durchholz
1997-09-11 0:00 ` Robert Dewar
1997-09-08 0:00 ` Robert Dewar
1997-09-11 0:00 ` Don Harrison
1997-09-12 0:00 ` Robert Dewar
1997-09-08 0:00 ` Robert Dewar
1997-09-11 0:00 ` Don Harrison
1997-09-05 0:00 ` Patrick Doyle
1997-09-05 0:00 ` W. Wesley Groleau x4923
1997-09-06 0:00 ` Patrick Doyle
1997-09-05 0:00 ` Jon S Anthony
1997-09-06 0:00 ` Patrick Doyle
1997-09-06 0:00 ` Jon S Anthony
1997-09-04 0:00 ` Joerg Rodemann
1997-09-05 0:00 ` Don Harrison
[not found] ` <340fdb9f.0@news.uni-ulm.de>
1997-09-06 0:00 ` Joachim Durchholz
1997-09-06 0:00 ` Joachim Durchholz
1997-09-05 0:00 ` Matthew Heaney
1997-09-06 0:00 ` Matt Kennel (Remove 'NOSPAM' to reply) [this message]
1997-09-06 0:00 ` Jon S Anthony
1997-09-06 0:00 ` Patrick Doyle
1997-09-06 0:00 ` Matthew Heaney
1997-09-06 0:00 ` Matthew Heaney
1997-09-07 0:00 ` Patrick Doyle
1997-09-07 0:00 ` Matthew Heaney
1997-09-10 0:00 ` Don Harrison
1997-09-10 0:00 ` Tucker Taft
1997-09-10 0:00 ` Matthew Heaney
1997-09-10 0:00 ` Patrick Doyle
1997-09-12 0:00 ` Robert Dewar
1997-09-13 0:00 ` Patrick Doyle
1997-09-11 0:00 ` Lee Webber
1997-09-15 0:00 ` W. Wesley Groleau x4923
1997-09-12 0:00 ` Don Harrison
1997-09-10 0:00 ` Don Harrison
1997-09-12 0:00 ` Robert Dewar
1997-09-16 0:00 ` Don Harrison
1997-09-17 0:00 ` Robert Dewar
1997-09-10 0:00 ` Patrick Doyle
1997-09-16 0:00 ` Don Harrison
1997-09-18 0:00 ` Robert Dewar
1997-09-18 0:00 ` Shmuel (Seymour J.) Metz
1997-09-20 0:00 ` Robert Dewar
1997-09-10 0:00 ` Samuel Mize
1997-09-10 0:00 ` Samuel Mize
1997-09-11 0:00 ` Don Harrison
1997-09-11 0:00 ` Robert Dewar
1997-09-12 0:00 ` Samuel Mize
1997-09-13 0:00 ` Tucker Taft
1997-09-12 0:00 ` Samuel T. Harris
1997-09-17 0:00 ` Don Harrison
1997-09-18 0:00 ` Robert Dewar
1997-09-10 0:00 ` Matthew Heaney
1997-09-11 0:00 ` Robert Dewar
1997-09-10 0:00 ` Robert Dewar
1997-09-10 0:00 ` Nick Leaton
1997-09-16 0:00 ` Frederic Guerin
1997-09-06 0:00 ` Joachim Durchholz
1997-09-08 0:00 ` John G. Volan
1997-09-09 0:00 ` Nick Leaton
1997-09-09 0:00 ` John G. Volan
1997-09-10 0:00 ` Nick Leaton
1997-09-10 0:00 ` Samuel Mize
1997-09-09 0:00 ` Paul Johnson
[not found] ` <dewar.873826570@merv>
1997-09-09 0:00 ` Matthew Heaney
1997-09-11 0:00 ` Robert Dewar
1997-09-07 0:00 ` Robert Dewar
1997-09-08 0:00 ` Patrick Doyle
1997-09-09 0:00 ` Don Harrison
1997-09-09 0:00 ` W. Wesley Groleau x4923
1997-09-10 0:00 ` Robert Dewar
1997-09-11 0:00 ` Don Harrison
1997-09-12 0:00 ` Robert Dewar
1997-09-16 0:00 ` Don Harrison
1997-09-17 0:00 ` Robert Dewar
1997-09-01 0:00 ` Matt Kennel (Remove 'NOSPAM' to reply)
1997-09-02 0:00 ` Nick Leaton
1997-09-03 0:00 ` Matt Kennel (Remove 'NOSPAM' to reply)
1997-09-15 0:00 Marc Wachowitz
1997-09-16 0:00 ` Owen Fellows
-- strict thread matches above, loose matches on Subject: below --
1997-09-12 0:00 Marc Wachowitz
1997-09-12 0:00 ` Samuel T. Harris
1997-09-12 0:00 ` Jon S Anthony
1997-09-15 0:00 ` Samuel T. Harris
1997-09-16 0:00 ` Jon S Anthony
1997-09-12 0:00 ` Joachim Durchholz
1997-09-09 0:00 Marc Wachowitz
1997-09-15 0:00 ` Owen Fellows
1997-10-13 0:00 ` Bill Foote
1997-09-06 0:00 Ell
1997-09-06 0:00 ` Samuel Mize
[not found] <EForKz.FJ7@ecf.toronto.edu>
1997-09-01 0:00 ` Don Harrison
1997-09-02 0:00 ` Don Harrison
1997-08-07 0:00 Safety-critical development in Ada and Eiffel Ken Garlington
1997-08-12 0:00 ` Don Harrison
1997-08-25 0:00 ` Design by Contract 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>
[not found] ` <3403F668.F6B57D97@calfp.co.uk>
[not found] ` <34041331.0@news.uni-ulm.de>
[not found] ` <3404696D.4487EB71@eiffel.com>
1997-08-27 0:00 ` Interface/Implementation (was Re: Design by Contract) Bertrand Meyer
[not found] ` <34048FDC.13728473@eiffel.com>
1997-08-27 0:00 ` Bertrand Meyer
1997-08-28 0:00 ` Jon S Anthony
1997-08-29 0:00 ` Robert Dewar
[not found] ` <EForsv.Fqo@ecf.toronto.edu>
[not found] ` <JSA.97Aug29191413@alexandria.organon.com>
[not found] ` <EFqDAG.2zn@ecf.toronto.edu>
1997-08-30 0:00 ` Jon S Anthony
1997-09-02 0:00 ` Don Harrison
1997-09-02 0:00 ` Jon S Anthony
1997-09-03 0:00 ` Don Harrison
[not found] ` <EFwuzD.BxE@ecf.toronto.edu>
1997-09-04 0:00 ` John G. Volan
1997-09-04 0:00 ` W. Wesley Groleau x4923
1997-09-05 0:00 ` Patrick Doyle
1997-09-05 0:00 ` W. Wesley Groleau x4923
1997-09-06 0:00 ` Patrick Doyle
1997-09-08 0:00 ` Paul Johnson
1997-09-06 0:00 ` Jon S Anthony
1997-09-08 0:00 ` Robert Dewar
1997-09-09 0:00 ` Patrick Doyle
1997-09-09 0:00 ` Matthew Heaney
1997-09-10 0:00 ` Patrick Doyle
1997-09-09 0:00 ` Paul Johnson
1997-09-11 0:00 ` Robert Dewar
1997-09-11 0:00 ` Veli-Pekka Nousiainen
1997-09-12 0:00 ` Paul Johnson
1997-09-14 0:00 ` Ken Garlington
1997-09-09 0:00 ` Robert S. White
1997-09-09 0:00 ` Matt Kennel (Remove 'NOSPAM' to reply)
1997-09-10 0:00 ` John Viega
1997-09-10 0:00 ` Matt Kennel (Remove 'NOSPAM' to reply)
1997-09-05 0:00 ` Patrick Doyle
1997-09-05 0:00 ` Franck Arnaud
1997-09-04 0:00 ` Don Harrison
1997-09-05 0:00 ` Patrick Doyle
1997-09-09 0:00 ` Don Harrison
1997-09-09 0:00 ` W. Wesley Groleau x4923
1997-09-10 0:00 ` Veli-Pekka Nousiainen
1997-09-10 0:00 ` Samuel Mize
1997-09-12 0:00 ` Don Harrison
1997-09-10 0:00 ` Patrick Doyle
1997-09-10 0:00 ` Joerg Rodemann
1997-09-10 0:00 ` Joachim Durchholz
1997-09-12 0:00 ` Joerg Rodemann
1997-09-10 0:00 ` Patrick Doyle
1997-09-11 0:00 ` Matt Austern
1997-09-12 0:00 ` Jon S Anthony
1997-09-13 0:00 ` Patrick Doyle
1997-09-11 0:00 ` Robert S. White
1997-09-11 0:00 ` Don Harrison
1997-09-12 0:00 ` Robert Dewar
1997-09-13 0:00 ` Patrick Doyle
1997-09-12 0:00 ` Jon S Anthony
1997-09-13 0:00 ` Patrick Doyle
1997-09-16 0:00 ` Brian Rogoff
1997-08-28 0:00 ` Patrick Doyle
1997-08-28 0:00 ` W. Wesley Groleau x4923
1997-08-28 0:00 ` Tucker Taft
1997-08-28 0:00 ` W. Wesley Groleau x4923
1997-08-28 0:00 ` Jon S Anthony
1997-08-29 0:00 ` Suzanne Zampella
1997-08-29 0:00 ` Jon S Anthony
[not found] ` <EFnK8D.Lsv@ecf.toronto.edu>
1997-08-29 0:00 ` Jon S Anthony
1997-08-30 0:00 ` Patrick Doyle
1997-08-30 0:00 ` Jon S Anthony
1997-09-01 0:00 ` Patrick Doyle
[not found] ` <340E9BA2.32B3@rbgg252.rbg1.siemens.de>
1997-09-07 0:00 ` Robert Dewar
[not found] ` <3406A707.787D@dmu.ac.uk>
1997-08-29 0:00 ` Joerg Rodemann
1997-08-29 0:00 ` Ralph Paul
1997-09-01 0:00 ` Don Harrison
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