From: Richard Riehle <rriehle@nunic.nu.edu>
Subject: Re: PL/I Versus Ada (Was: Arianne ...)
Date: 1996/08/28
Date: 1996-08-28T00:00:00+00:00 [thread overview]
Message-ID: <Pine.GSO.3.92.960828172250.8140A-100000@nunic.nu.edu> (raw)
In-Reply-To: 4vfmge$2je@overload.lbl.gov
On 21 Aug 1996, Tony Konashenok wrote:
> What exactly is an "object-oriented version" of a language? Why is PL/I
> not object-oriented? IMHO, one can do object-oriented programming even in
> assembly language, given enough skill and dedication. Too many people are
> confusing object-oriented programming as a method with the usage of
> C++/Ada-specific features.
Well you may have your own idea of object-oriented programming.
We usually think of encapsulated classes which support extensible
inheritance, dynamic binding, and polymorphism. We ordinarily do not
consider the heroic efforts of a star programmer as being sufficient
to implement the method. There are specific, widely-accepted criteria
for object-oriented programming which are not language-specific.
So I will rephrase the question.
Is there a version of PL/I which:
1) has explicit syntactic support for extensible inheritance
of encapsulated classes (i. e., supports Meyer's "open/closed
principle") ?
2) supports dynamic selection of class object based on run-time
evaluation of class membership (dynamic binding and
polymorphism)?
3) permits the definition of a type/class with hidden data
structures that are visible only via their exported
methods? (a la "programming by contract")?
4) allows the definition of "abstract classes" (deferred classes)
for implementation, through extensible inheritance and
polymorphism, of variants of that class. This should include
the capability for late binding?
None of these characteristics are language-specific, but each is
included in any language defined, by contemporary usage, as an
object-oriented programming language. How does PL/I compare?
Richard Riehle
next prev parent reply other threads:[~1996-08-28 0:00 UTC|newest]
Thread overview: 188+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-07-25 0:00 Ariane 5 - not an exception? Simon Bluck
1996-07-25 0:00 ` Multiple reasons for failure of Ariane 5 (was: Re: Ariane 5 - not an exception?) Kirk Beitz
1996-07-26 0:00 ` Robert I. Eachus
1996-07-26 0:00 ` ++ robin
1996-08-05 0:00 ` Darren C Davenport
1996-08-06 0:00 ` U32872
1996-08-07 0:00 ` Robert Dewar
1996-08-08 0:00 ` Pascal Martin @lone
1996-08-09 0:00 ` Robert Dewar
1996-08-10 0:00 ` dwnoon
1996-08-11 0:00 ` Robert Dewar
1996-08-15 0:00 ` dwnoon
1996-08-16 0:00 ` Robert Dewar
1996-08-20 0:00 ` dwnoon
1996-08-12 0:00 ` Ken Garlington
1996-08-15 0:00 ` Richard Riehle
1996-08-22 0:00 ` ++ robin
1996-08-23 0:00 ` Ken Garlington
1996-08-31 0:00 ` Ada versus PL/I " Richard Riehle
1996-09-02 0:00 ` ++ robin
1996-09-02 0:00 ` Richard A. O'Keefe
1996-09-03 0:00 ` ++ robin
1996-09-03 0:00 ` Robb Nebbe
1996-09-17 0:00 ` shmuel
1996-09-17 0:00 ` Jay McFadyen
1996-09-18 0:00 ` John McCabe
1996-09-20 0:00 ` shmuel
1996-09-03 0:00 ` ++ robin
1996-09-04 0:00 ` Robert Dewar
1996-09-07 0:00 ` ++ robin
1996-09-06 0:00 ` PL/I or PL/1 Larry Hazel
1996-09-03 0:00 ` Ada versus PL/I (was: Re: Ariane 5 - not an exception?) J. Kanze
1996-09-07 0:00 ` Robert Dewar
1996-09-09 0:00 ` ++ robin
1996-09-09 0:00 ` Robert Dewar
1996-09-09 0:00 ` Ken Garlington
1996-09-11 0:00 ` Multiple reasons for failure of Ariane 5 " J.Worringen
1996-09-12 0:00 ` Ken Garlington
1996-09-14 0:00 ` Use DejaNews to retrieve Ariane discussion David Alex Lamb
1996-09-19 0:00 ` Earl H. Kinmonth
1996-09-14 0:00 ` Multiple reasons for failure of Ariane 5 (was: Re: Ariane 5 - not an exception?) David Alex Lamb
1996-08-11 0:00 ` ++ robin
[not found] ` <4uibvh$References: <Dv45EJ.8r@fsa.bris.ac.uk>
1996-08-16 0:00 ` A. Grant
1996-08-08 0:00 ` bohn
1996-08-23 0:00 ` Jon S Anthony
1996-08-26 0:00 ` ++ robin
1996-08-23 0:00 ` Jon S Anthony
1996-08-23 0:00 ` ++ robin
1996-08-23 0:00 ` Richard A. O'Keefe
1996-08-23 0:00 ` Ken Garlington
1996-08-26 0:00 ` ++ robin
1996-08-27 0:00 ` Ken Garlington
1996-08-28 0:00 ` Larry Kilgallen
1996-08-29 0:00 ` Ken Garlington
1996-08-30 0:00 ` ++ robin
1996-08-30 0:00 ` David Weller
1996-09-04 0:00 ` Ken Garlington
1996-09-06 0:00 ` Sandy McPherson
1996-09-09 0:00 ` Ken Garlington
1996-08-30 0:00 ` Jon S Anthony
1996-08-26 0:00 ` Ken Garlington
1996-08-26 0:00 ` Dave Jones
1996-08-27 0:00 ` Ken Garlington
1996-08-30 0:00 ` ++ robin
1996-09-04 0:00 ` Ken Garlington
1996-09-06 0:00 ` ++ robin
1996-09-18 0:00 ` Merlin Dorfman
1996-09-20 0:00 ` John McCabe
1996-08-30 0:00 ` ++ robin
1996-08-30 0:00 ` John McCabe
1996-09-06 0:00 ` Jon S Anthony
1996-09-06 0:00 ` Robert Dewar
1996-07-26 0:00 ` Ariane 5 - not an exception? Bob Gilbert
1996-07-29 0:00 ` Martin Tom Brown
1996-07-30 0:00 ` John McCabe
1996-07-31 0:00 ` Greg Bond
1996-08-03 0:00 ` John McCabe
1996-07-26 0:00 ` ++ robin
1996-07-29 0:00 ` Bill Angel
1996-07-29 0:00 ` Paul_Green
1996-07-30 0:00 ` Lloyd Fischer
1996-07-30 0:00 ` Ken Garlington
1996-07-30 0:00 ` Nancy Mead
1996-07-31 0:00 ` Steve O'Neill
1996-07-31 0:00 ` Tucker Taft
1996-08-01 0:00 ` root
1996-08-01 0:00 ` Tucker Taft
1996-07-30 0:00 ` Richard Shetron
1996-07-30 0:00 ` ++ robin
1996-07-30 0:00 ` Bob Kurtz
1996-08-04 0:00 ` Richard Riehle
1996-08-05 0:00 ` Fergus Henderson
1996-08-05 0:00 ` John McCabe
1996-08-05 0:00 ` Nigel Tzeng
1996-08-06 0:00 ` John McCabe
1996-08-13 0:00 ` ++ robin
1996-08-13 0:00 ` Ken Garlington
1996-08-13 0:00 ` Kirk Bradley
1996-08-14 0:00 ` Ken Garlington
1996-08-18 0:00 ` PL/I Versus Ada (Was: Arianne ...) Richard Riehle
1996-08-19 0:00 ` Robert Dewar
1996-08-20 0:00 ` Lon Amick
1996-08-21 0:00 ` Tim Dugan
1996-08-21 0:00 ` Lon D. Gowen, Ph.D.
1996-08-21 0:00 ` Tony Konashenok
1996-08-28 0:00 ` Richard Riehle [this message]
1996-08-29 0:00 ` Lon D. Gowen, Ph.D.
1996-08-30 0:00 ` Tony Konashenok
1996-08-30 0:00 ` Adam Beneschan
1996-08-30 0:00 ` John McCabe
1996-08-23 0:00 ` arbuckj
1996-08-22 0:00 ` Ariane 5 - not an exception? ++ robin
1996-08-22 0:00 ` Ken Garlington
1996-08-13 0:00 ` Darren C Davenport
1996-08-14 0:00 ` John McCabe
1996-08-19 0:00 ` Chris Papademetrious
1996-08-22 0:00 ` ++ robin
1996-08-22 0:00 ` Martin Tom Brown
1996-08-22 0:00 ` John McCabe
1996-08-23 0:00 ` Ken Garlington
1996-08-24 0:00 ` John McCabe
1996-08-26 0:00 ` Byron B. Kauffman
1996-08-27 0:00 ` John McCabe
1996-08-28 0:00 ` Byron B. Kauffman
1996-08-28 0:00 ` Robert Dewar
1996-08-29 0:00 ` Ted Dennison
1996-08-30 0:00 ` John McCabe
1996-08-23 0:00 ` Bob Gilbert
1996-08-24 0:00 ` Robert I. Eachus
1996-08-25 0:00 ` John McCabe
1996-08-27 0:00 ` Tom Speer
1996-08-26 0:00 ` Jon S Anthony
1996-08-20 0:00 ` Richard Riehle
1996-07-30 0:00 ` Steve O'Neill
1996-07-31 0:00 ` Martin Tom Brown
1996-07-31 0:00 ` Nigel Tzeng
1996-08-02 0:00 ` Ken Garlington
1996-08-03 0:00 ` Thomas Kendelbacher
1996-08-01 0:00 ` ++ robin
1996-08-01 0:00 ` Ken Garlington
1996-08-05 0:00 ` John McCabe
1996-08-06 0:00 ` Ken Garlington
1996-08-06 0:00 ` Mark van Walraven
1996-08-06 0:00 ` Ken Garlington
1996-08-02 0:00 ` Pascal Martin @lone
1996-08-03 0:00 ` Dr. Richard Botting
1996-08-05 0:00 ` system
1996-08-06 0:00 ` ++ robin
1996-08-08 0:00 ` Darius Blasband
1996-08-10 0:00 ` dwnoon
1996-08-12 0:00 ` Thomas Kendelbacher
1996-08-13 0:00 ` ++ robin
1996-08-13 0:00 ` Roy Gardiner
1996-08-13 0:00 ` Ken Garlington
1996-08-13 0:00 ` Lance Kibblewhite
1996-08-13 0:00 ` ++ robin
1996-08-15 0:00 ` Richard Riehle
1996-08-05 0:00 ` Steve O'Neill
1996-08-06 0:00 ` Francis Lipski
1996-08-07 0:00 ` Martin Tom Brown
1996-08-09 0:00 ` Ken Garlington
1996-08-06 0:00 ` Frank Manning
1996-08-08 0:00 ` Steve O'Neill
1996-08-09 0:00 ` Pat Rogers
1996-08-09 0:00 ` JP Thornley
1996-08-13 0:00 ` ++ robin
1996-08-13 0:00 ` Steve O'Neill
1996-07-30 0:00 ` Ken Garlington
1996-08-02 0:00 ` Craig P. Beyers
1996-08-01 0:00 ` Jon S Anthony
1996-08-02 0:00 ` James Kanze US/ESC 60/3/141 #40763
1996-08-06 0:00 ` Stefan 'Stetson' Skoglund
1996-08-06 0:00 ` Robert I. Eachus
1996-07-26 0:00 ` JP Thornley
1996-07-29 0:00 ` JP Thornley
1996-07-29 0:00 ` Nigel Tzeng
1996-07-29 0:00 ` Ken Garlington
1996-07-30 0:00 ` Robert I. Eachus
1996-07-31 0:00 ` JP Thornley
1996-08-01 0:00 ` Alan Brain
1996-08-02 0:00 ` JP Thornley
1996-08-01 0:00 ` Ken Garlington
1996-07-26 0:00 ` Theodore E. Dennison
1996-07-29 0:00 ` Ken Garlington
1996-07-27 0:00 ` Bill Angel
1996-07-30 0:00 ` Dr. Richard Botting
1996-07-30 0:00 ` David Weller
1996-07-30 0:00 ` Robert Dewar
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