From: tiggr@es.ele.tue.nl (Pieter Schoenmakers)
To: pcg@aber.ac.uk (Piercarlo Grandi)
Subject: Re: Static vs. Dynamic typing again (was Re: OO, C++, and something much better!)
Date: 1997/02/15
Date: 1997-02-15T00:00:00+00:00 [thread overview]
Message-ID: <x7afp53fly.fsf@tom.ics.ele.tue.nl> (raw)
In-Reply-To: 32E7E08A.3079@parcplace.com
In article <vwjk9obnph4.fsf@cassin.dcs.aber.ac.uk> pcg@aber.ac.uk (Piercarlo Grandi) writes:
Consider:
class C // bounded stack
...
This defines a class and a type encapsulated within it. Now suppose we
just added something like the following two procedures:
class C // bounded deque
...
void *get();
void put(void *) { .... }
is the second 'C' the same type as the first 'C", only updated? To me
they are completely different types, for they have different semantics,
as well as different interface. Instances of one 'C' are not instances
of the other 'C'.
There are (many, very) valid examples of adding methods to a class,
which do not change the semantics of the object. In the example, only
adding a `print' method, with the obvious functionality, would not
change the semantics of the existing stack objects. Nor would it create
a new class. The stack objects would just be able to print themselves.
Objective-C (at least the GNU and NeXT implementations) allows methods
to be added to a class in a running program. NeXT's runtime library
allows method replacement.
Cecil allows (library) classes to be extended. `The Cecil language,
specification and rationale' does not specify to what extent this is
allowed at run time.
TOM allows, both at compile time and at run time, methods to be added
and replaced. Since the implementation of such methods may need some
state to be maintained in the object, instance variables can be added as
well. --Tiggr
next prev parent reply other threads:[~1997-02-15 0:00 UTC|newest]
Thread overview: 379+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-01-16 0:00 OO, C++, and something much better! Jon S Anthony
1997-01-17 0:00 ` Don Harrison
1997-01-16 0:00 ` Matthew Heaney
1997-01-17 0:00 ` Alan Lovejoy
1997-01-17 0:00 ` Norman H. Cohen
1997-01-17 0:00 ` Alan Lovejoy
1997-01-18 0:00 ` Fergus Henderson
1997-01-17 0:00 ` Alan Lovejoy
1997-01-20 0:00 ` Fergus Henderson
1997-01-19 0:00 ` Alan Lovejoy
1997-01-20 0:00 ` Damon Feldman
1997-01-19 0:00 ` Alan Lovejoy
1997-01-20 0:00 ` Bill Gooch
1997-01-20 0:00 ` David Hanley
1997-01-21 0:00 ` Alan Lovejoy
1997-01-22 0:00 ` Fergus Henderson
1997-01-22 0:00 ` Alan Lovejoy
1997-01-23 0:00 ` Bob Jarvis
1997-01-20 0:00 ` Graham Hughes
1997-01-21 0:00 ` Alan Lovejoy
1997-01-21 0:00 ` Marc Robertson
1997-01-24 0:00 ` Mark Windholtz
1997-01-27 0:00 ` David Hanley
1997-01-28 0:00 ` Eric Clayberg
[not found] ` <32EE2FEE.62FE@p <32EE8415.2F5B@netright.com>
1997-01-28 0:00 ` Eric Clayberg
1997-01-29 0:00 ` David Hanley
1997-01-29 0:00 ` Eric Clayberg
1997-01-28 0:00 ` David Hanley
1997-01-28 0:00 ` Alan Lovejoy
1997-01-29 0:00 ` Matt Kennel
1997-01-30 0:00 ` Alan Lovejoy
1997-01-30 0:00 ` David L. Shang
1997-01-30 0:00 ` Black box or white box (Re: OO, C++, and something much better!) David L. Shang
1997-01-29 0:00 ` OO, C++, and something much better! Jun Nolasco
1997-01-21 0:00 ` Matt Kennel
1997-01-22 0:00 ` Fergus Henderson
1997-01-22 0:00 ` Fergus Henderson
1997-01-22 0:00 ` Eric Clayberg
1997-01-22 0:00 ` Graham Hughes
1997-01-23 0:00 ` Eric Clayberg
1997-01-23 0:00 ` Claus Reinke
1997-01-25 0:00 ` Eric Clayberg
1997-01-25 0:00 ` Lawrence G. Mayka
1997-01-25 0:00 ` Fergus Henderson
1997-01-28 0:00 ` Claus Reinke
1997-01-24 0:00 ` Don Harrison
1997-01-24 0:00 ` Eric Clayberg
1997-01-28 0:00 ` Don Harrison
1997-01-23 0:00 ` Mark Woodruff
1997-01-24 0:00 ` Richard A. O'Keefe
[not found] ` <E4voIF.86o@world.std.com>
1997-02-12 0:00 ` Ulf Schuenemann
1997-01-23 0:00 ` Robb Nebbe
1997-01-23 0:00 ` David Hanley
1997-01-25 0:00 ` Eric Clayberg
1997-01-23 0:00 ` Matt Kennel
1997-01-25 0:00 ` Eric Clayberg
1997-01-27 0:00 ` Jon S Anthony
1997-01-24 0:00 ` Fergus Henderson
1997-01-24 0:00 ` Alan Lovejoy
1997-01-26 0:00 ` Fergus Henderson
[not found] ` <32E9BAAC. <5ce8t3$6gv@mulga.cs.mu.OZ.AU>
1997-01-28 0:00 ` Alan Lovejoy
1997-01-28 0:00 ` Alan Knight
1997-01-29 0:00 ` Nick Leaton
1997-01-29 0:00 ` Fergus Henderson
1997-01-30 0:00 ` Alan Lovejoy
1997-01-24 0:00 ` Richard A. O'Keefe
1997-01-25 0:00 ` Joachim Durchholz
1997-01-27 0:00 ` Ed Shirk
1997-01-27 0:00 ` Rolf Breuning
1997-01-22 0:00 ` Damon Feldman
1997-01-29 0:00 ` Joachim Durchholz
1997-01-25 0:00 ` Eric Clayberg
1997-01-26 0:00 ` Robert Dewar
1997-01-27 0:00 ` Samuel S. Shuster
1997-01-27 0:00 ` Richard Kenner
1997-01-29 0:00 ` Robert Dewar
1997-01-30 0:00 ` Eirik Mangseth
1997-01-28 0:00 ` Jun Nolasco
1997-01-29 0:00 ` Robert Dewar
1997-01-29 0:00 ` Richard Kenner
1997-01-29 0:00 ` David Hanley
1997-01-29 0:00 ` Richard Kenner
1997-01-30 0:00 ` Nick Leaton
1997-01-30 0:00 ` Robert Dewar
1997-01-30 0:00 ` Richard Kenner
1997-01-30 0:00 ` Nick Leaton
1997-01-27 0:00 ` Bob Jarvis
1997-01-27 0:00 ` Robert Dewar
1997-01-27 0:00 ` Robert A Duff
1997-01-29 0:00 ` Robert Dewar
1997-01-27 0:00 ` Matthew Heaney
1997-01-27 0:00 ` Eric Clayberg
1997-01-29 0:00 ` Robert Dewar
1997-01-29 0:00 ` Robert A Duff
1997-01-29 0:00 ` Eric Clayberg
1997-01-27 0:00 ` Eric Clayberg
1997-01-28 0:00 ` Robert I. Eachus
1997-02-08 0:00 ` Robin Rosenberg
1997-01-25 0:00 ` Jon S Anthony
1997-01-27 0:00 ` David Hanley
1997-01-29 0:00 ` Joachim Durchholz
1997-01-29 0:00 ` Dennis Smith
1997-01-27 0:00 ` Eric Clayberg
1997-01-29 0:00 ` Fergus Henderson
1997-01-29 0:00 ` Joachim Durchholz
1997-01-27 0:00 ` Jon S Anthony
1997-01-28 0:00 ` David Hanley
1997-01-28 0:00 ` David Hanley
1997-01-28 0:00 ` Jacqueline U. Robertson
1997-01-29 0:00 ` David Hanley
1997-01-29 0:00 ` Fergus Henderson
1997-01-30 0:00 ` Robert C. Martin
[not found] ` <5cr068$gpa@uni.library.ucla.edu>
1997-06-27 0:00 ` David Shang
1997-06-28 0:00 ` Mike Stark
1997-06-28 0:00 ` Ronald E Jeffries
1997-06-29 0:00 ` Mike Anderson
1997-06-29 0:00 ` Robert Dewar
1997-06-30 0:00 ` Kohler Markus
1997-01-29 0:00 ` Joachim Durchholz
1997-01-28 0:00 ` Eric Clayberg
1997-01-28 0:00 ` Matt Kennel
1997-01-28 0:00 ` Luther Hampton
1997-01-28 0:00 ` Robert I. Eachus
1997-01-29 0:00 ` Jon S Anthony
1997-01-29 0:00 ` Eric Clayberg
1997-01-29 0:00 ` Rolf Breuning
1997-01-29 0:00 ` David Hanley
1997-01-29 0:00 ` Eric Clayberg
1997-01-25 0:00 ` Robert Dewar
1997-01-26 0:00 ` James O'Connor
1997-01-26 0:00 ` Robert Dewar
1997-01-26 0:00 ` George Wolke
1997-01-27 0:00 ` Jerry van Dijk
1997-01-28 0:00 ` Robert A Duff
1997-01-28 0:00 ` Jerry van Dijk
1997-01-29 0:00 ` Stanley R. Allen
1997-01-30 0:00 ` Robert A Duff
1997-01-28 0:00 ` Jon S Anthony
1997-01-29 0:00 ` Robert A Duff
1997-01-28 0:00 ` Alan Lovejoy
1997-01-25 0:00 ` Robert Dewar
1997-01-27 0:00 ` Bob Jarvis
1997-01-27 0:00 ` Robert Dewar
1997-01-28 0:00 ` Alan Lovejoy
1997-01-19 0:00 ` Soren Skogstad Nielsen
1997-01-20 0:00 ` Joachim Durchholz
1997-01-26 0:00 ` Joachim Durchholz
1997-01-29 0:00 ` Multiple Type Interfaces Jon S Anthony
1997-01-28 0:00 ` Dave Gibson
1997-01-28 0:00 ` Robert A Duff
1997-01-28 0:00 ` Norman H. Cohen
1997-01-28 0:00 ` david scott gibson
1997-01-28 0:00 ` Matthew Heaney
1997-01-29 0:00 ` david scott gibson
1997-01-29 0:00 ` Robert A Duff
1997-01-29 0:00 ` david scott gibson
1997-01-21 0:00 ` OO, C++, and something much better! Matthew S. Whiting
1997-01-22 0:00 ` Fergus Henderson
1997-01-22 0:00 ` Eric Clayberg
1997-01-23 0:00 ` Don Harrison
1997-01-27 0:00 ` John Woods
1997-01-28 0:00 ` Alan Lovejoy
1997-01-23 0:00 ` Combining dynamic and static typing Don Harrison
1997-01-24 0:00 ` Erik M. Buck
[not found] ` <01bc0b21$6a8293e0$7df2ad80@wkst01.milagro.austin.tx.us>
1997-01-25 0:00 ` Nathan M. Urban
1997-01-28 0:00 ` David L. Shang
1997-01-28 0:00 ` Nathan M. Urban
1997-01-29 0:00 ` David L. Shang
1997-01-29 0:00 ` Russ McClelland
1997-01-28 0:00 ` Luther Hampton
1997-01-29 0:00 ` Marc De Scheemaecker
[not found] ` <5d0efr$meb@news.xmission.com>
1997-02-09 0:00 ` daniel damian burden
1997-01-27 0:00 ` David L. Shang
1997-01-27 0:00 ` Robert I. Eachus
1997-01-28 0:00 ` Robert C. Martin
1997-01-29 0:00 ` David L. Shang
1997-01-24 0:00 ` OO, C++, and something much better! Andy Bower
1997-01-25 0:00 ` Robert Dewar
1997-01-26 0:00 ` William Clodius
1997-01-25 0:00 ` Robert Dewar
1997-01-26 0:00 ` Eric Clayberg
1997-01-26 0:00 ` Robert Dewar
1997-01-26 0:00 ` Robert Dewar
1997-01-27 0:00 ` Robert C. Martin
1997-01-29 0:00 ` Robert Dewar
1997-01-29 0:00 ` Robert A Duff
1997-01-22 0:00 ` Don Harrison
1997-01-22 0:00 ` John Kuszewski
1997-01-23 0:00 ` Don Harrison
1997-01-23 0:00 ` Tansel Ersavas
1997-01-23 0:00 ` Travis Griggs
1997-01-24 0:00 ` Fergus Henderson
1997-01-22 0:00 ` Alan Lovejoy
1997-01-21 0:00 ` Matthew S. Whiting
1997-01-24 0:00 ` Tansel Ersavas
1997-01-24 0:00 ` Tansel Ersavas
1997-01-25 0:00 ` Fergus Henderson
1997-01-25 0:00 ` Robert A Duff
1997-01-26 0:00 ` Bob Haugen
1997-01-26 0:00 ` Robert Dewar
1997-01-26 0:00 ` TanselErsavas
1997-01-27 0:00 ` Samuel S. Shuster
1997-01-26 0:00 ` Larry J. Elmore
1997-01-26 0:00 ` Eric Clayberg
1997-01-27 0:00 ` David Hanley
1997-01-26 0:00 ` Robert Dewar
1997-01-26 0:00 ` James O'Connor
1997-01-26 0:00 ` TanselErsavas
1997-01-26 0:00 ` Robert Dewar
1997-01-27 0:00 ` Eric Clayberg
1997-01-28 0:00 ` Antoine Trux
1997-01-29 0:00 ` Robert Dewar
1997-01-24 0:00 ` Tansel Ersavas
1997-01-25 0:00 ` Damon Feldman
1997-01-26 0:00 ` Felix Beer
1997-01-28 0:00 ` Robert C. Martin
1997-01-28 0:00 ` Matt Kennel
1997-01-29 0:00 ` Del Archer
1997-01-27 0:00 ` David Hanley
1997-01-28 0:00 ` OO, C++, and more and more useless arguments! Robert C. Martin
1997-01-28 0:00 ` OO, C++, and something much better! Alan Lovejoy
1997-01-28 0:00 ` Al Christians
1997-01-29 0:00 ` Alan Lovejoy
1997-02-21 0:00 ` Chris Bitmead
1997-02-21 0:00 ` Eric W. Nikitin
1997-02-21 0:00 ` Brian Rogoff
1997-02-24 0:00 ` Jon S Anthony
1997-02-24 0:00 ` Brian Rogoff
1997-02-25 0:00 ` Eric W. Nikitin
1997-01-21 0:00 ` Norman H. Cohen
1997-01-22 0:00 ` Eric Clayberg
1997-01-23 0:00 ` Norman H. Cohen
1997-01-24 0:00 ` traymond
1997-01-27 0:00 ` Norman H. Cohen
1997-01-28 0:00 ` traymond
1997-01-24 0:00 ` Eric Clayberg
1997-01-27 0:00 ` Norman H. Cohen
1997-01-28 0:00 ` Tim Ottinger
1997-01-29 0:00 ` Ted Dennison
1997-01-25 0:00 ` Tansel Ersavas
1997-01-27 0:00 ` Norman H. Cohen
1997-01-27 0:00 ` Brian Rogoff
1997-01-28 0:00 ` Reflection in Ada (was: Re: OO, C++, and something much better!) Norman H. Cohen
1997-01-29 0:00 ` Eric W. Nikitin
1997-01-30 0:00 ` OO, C++, and something much better! Tim Ottinger
1997-01-23 0:00 ` Static vs. Dynamic typing again (was Re: OO, C++, and something much better!) Richie Bielak
1997-01-23 0:00 ` Bill Gooch
1997-01-23 0:00 ` Eric Clayberg
1997-01-23 0:00 ` Richie Bielak
1997-01-24 0:00 ` Eirik Mangseth
[not found] ` <32E85588.1978@parcplace.com>
1997-01-26 0:00 ` Paul Perkins
1997-01-26 0:00 ` Robert A Duff
1997-01-29 0:00 ` John Gale
1997-01-30 0:00 ` Robert A Duff
1997-01-28 0:00 ` Damon Feldman
1997-01-28 0:00 ` Eric Clayberg
1997-01-23 0:00 ` Richie Bielak
1997-01-23 0:00 ` Rolf Breuning
1997-01-23 0:00 ` Eric Clayberg
1997-01-24 0:00 ` Robb Nebbe
1997-01-25 0:00 ` OO, C++, and something much better! David N. Smith
1997-01-24 0:00 ` Static vs. Dynamic typing again (was Re: OO, C++, and something much better!) Richie Bielak
1997-01-24 0:00 ` Bob Jarvis
1997-01-24 0:00 ` Richie Bielak
1997-01-27 0:00 ` Eric W. Nikitin
1997-01-25 0:00 ` Robert A Duff
1997-01-30 0:00 ` Damon Feldman
1997-01-30 0:00 ` Defintion, again, was Re: Static vs. Dynamic typing again David L. Shang
1997-01-30 0:00 ` Static vs. Dynamic typing again (was Re: OO, C++, and something much better!) Fergus Henderson
1997-01-30 0:00 ` Robert A Duff
1997-02-09 0:00 ` Piercarlo Grandi
1997-02-10 0:00 ` Matt Kennel
1997-02-14 0:00 ` Piercarlo Grandi
1997-02-15 0:00 ` Pieter Schoenmakers [this message]
1997-02-16 0:00 ` Piercarlo Grandi
1997-01-27 0:00 ` Jun Nolasco
1997-01-28 0:00 ` Mark Windholtz
1997-01-28 0:00 ` Richie Bielak
1997-01-28 0:00 ` Alan Knight
1997-02-08 0:00 ` Static vs. Dynamic typing again (was Re: OO, C++, and something mu Joachim Durchholz
1997-01-23 0:00 ` OO, C++, and something much better! James O'Connor
1997-01-29 0:00 ` Stanley R. Allen
1997-01-30 0:00 ` Robert A Duff
1997-01-27 0:00 ` Jon S Anthony
1997-01-19 0:00 ` Keith Thompson
1997-01-22 0:00 ` Don Harrison
1997-01-23 0:00 ` Norman H. Cohen
1997-01-24 0:00 ` Don Harrison
1997-01-27 0:00 ` Norman H. Cohen
1997-01-29 0:00 ` "(Sub)type" -safety Don Harrison
1997-01-29 0:00 ` Jon S Anthony
1997-01-30 0:00 ` Don Harrison
1997-01-23 0:00 ` OO, C++, and something much better! Robert I. Eachus
1997-01-20 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-01-24 0:00 ` Jon S Anthony
1997-01-26 0:00 ` Eric Clayberg
1997-01-27 0:00 ` Jon S Anthony
1997-01-27 0:00 ` Jon S Anthony
1997-01-27 0:00 ` Jon S Anthony
1997-01-28 0:00 ` Jon S Anthony
1997-01-29 0:00 ` Stephen J Bevan
1997-01-21 0:00 ` Joachim Durchholz
1997-01-22 0:00 ` Richard A. O'Keefe
1997-01-27 0:00 ` Robert A Duff
1997-01-27 0:00 ` Bob Jarvis
1997-01-28 0:00 ` Travis Griggs
1997-01-28 0:00 ` Norman H. Cohen
1997-01-28 0:00 ` Russ McClelland
1997-01-27 0:00 ` Robert Dewar
1997-01-27 0:00 ` Robert A Duff
1997-01-29 0:00 ` Robert Dewar
1997-01-27 0:00 ` John Woods
1997-01-22 0:00 ` Eric Clayberg
1997-01-23 0:00 ` Joachim Durchholz
1997-01-24 0:00 ` Joachim Durchholz
1997-01-29 0:00 ` Multiple Type Interfaces Joachim Durchholz
1997-01-25 0:00 ` OO, C++, and something much better! James O'Connor
1997-01-26 0:00 ` Lawrence G. Mayka
1997-01-26 0:00 ` James O'Connor
1997-01-25 0:00 ` Tansel Ersavas
1997-01-25 0:00 ` Eric Clayberg
1997-01-27 0:00 ` Norman H. Cohen
1997-02-07 0:00 ` Richard A. O'Keefe
1997-02-07 0:00 ` Alan Lovejoy
1997-02-12 0:00 ` Piercarlo Grandi
1997-02-13 0:00 ` Alan Lovejoy
[not found] ` <yf3ybcsm5ce.fsf@sabi.demon.co.uk>
1997-02-14 0:00 ` Alan Lovejoy
1997-02-16 0:00 ` Piercarlo Grandi
1997-02-16 0:00 ` Alan Lovejoy
1997-02-17 0:00 ` Piercarlo Grandi
1997-02-13 0:00 ` Richard A. O'Keefe
1997-02-13 0:00 ` Alan Lovejoy
1997-02-18 0:00 ` Richard A. O'Keefe
1997-02-19 0:00 ` Mike Klein
1997-02-19 0:00 ` richard
1997-02-19 0:00 ` William Clodius
1997-02-19 0:00 ` Mike Klein
1997-02-15 0:00 ` Jon S Anthony
1997-02-16 0:00 ` Piercarlo Grandi
1997-02-16 0:00 ` Jon S Anthony
1997-02-18 0:00 ` Richard A. O'Keefe
1997-02-20 0:00 ` Matt Kennel
1997-02-20 0:00 ` Anders Pytte
1997-02-16 0:00 ` Definition of "operator" (was: OO, C++, and something much better!) Alan Lovejoy
1997-02-19 0:00 ` Dave Schaumann
1997-02-19 0:00 ` Anders Pytte
1997-02-17 0:00 ` OO, C++, and something much better! Jon S Anthony
1997-02-19 0:00 ` Piercarlo Grandi
1997-02-17 0:00 ` Jon S Anthony
1997-02-17 0:00 ` Definition of "operator" (was: OO, C++, and something much better!) Alan Lovejoy
1997-02-19 0:00 ` David L. Shang
1997-02-21 0:00 ` Jon S Anthony
1997-02-24 0:00 ` David L. Shang
1997-02-25 0:00 ` Jon S Anthony
1997-02-17 0:00 ` OO, C++, and something much better! Alan Lovejoy
1997-02-17 0:00 ` Jon S Anthony
1997-02-19 0:00 ` Piercarlo Grandi
1997-02-19 0:00 ` Mike Klein
1997-02-18 0:00 ` Bernard Badger
1997-02-18 0:00 ` Definition of "operator" (was: OO, C++, and something much better!) Jon S Anthony
1997-02-18 0:00 ` OO, C++, and something much better! Jon S Anthony
1997-02-19 0:00 ` Piercarlo Grandi
1997-02-19 0:00 ` Piercarlo Grandi
1997-02-21 0:00 ` Jon S Anthony
1997-02-24 0:00 ` Piercarlo Grandi
1997-02-22 0:00 ` Jon S Anthony
1997-02-22 0:00 ` Jon S Anthony
1997-02-22 0:00 ` Jon S Anthony
1997-02-22 0:00 ` Jon S Anthony
1997-02-22 0:00 ` Jon S Anthony
1997-02-25 0:00 ` Richard A. O'Keefe
1997-02-23 0:00 ` Definition of "operator" (was: OO, C++, and something much better!) Richard Katz
1997-02-24 0:00 ` David L. Shang
1997-02-25 0:00 ` OO, C++, and something much better! Jon S Anthony
1997-02-25 0:00 ` Jon S Anthony
1997-02-25 0:00 ` Jon S Anthony
1997-02-27 0:00 ` Clayton Weaver
1997-02-26 0:00 ` Mike Klein
1997-02-25 0:00 ` Jon S Anthony
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