From: jsa@alexandria (Jon S Anthony)
Subject: Re: Invoking parental methods (was: Java vs Ada 95)
Date: 1996/11/08
Date: 1996-11-08T00:00:00+00:00 [thread overview]
Message-ID: <JSA.96Nov8141603@alexandria> (raw)
In-Reply-To: E0EIM2.A3p.0.-s@inmet.camb.inmet.com
In article <E0GAKr.HB.0.-s@inmet.camb.inmet.com> mg@asp.camb.inmet.com (Mitch Gart) writes:
> procedure supertest is
> package p1 is
> type parent_obj is tagged null record;
> type super is access all parent_obj'class;
> procedure p_first (param: access parent_obj);
> end p1;
...[snip]...
> package p2 is
> type child_obj is new p1.parent_obj with null record;
> procedure p_first (param: access child_obj);
> end p2;
> package body p2 is
> procedure p_first (param: access child_obj) is
> begin
> put_line("child p_first");
> p1.p_first(p1.super(param)); -- ***
> end;
> end p2;
> The line marked *** dispatches back to p2.p_first, causing an
> infinite recursion. To get this one to do what's wanted, the
I'm not sure why anyone would think otherwise. I mean you haven't changed
anything about the thing referenced. Would anyone be confused by:
p : most_general_class_wide_access_type := new some_child_object
q : most_general_class_wide_access_type := new some_other_child_object
...
dispatchable_op(p); -- dispatch to some_child_object version
dispatchable_op(q); -- dispatch to some_other_child_object version
??
If not, why would the above "super" example be confusing?
Also, I think someone else pointed out a while ago that using subtypes
(and maybe package renames) will make you immune to code "ripple effects"
if you change the parent:
with p
...;
package parents renames p;
subtype parent is parents.t;
type x is new parent;
...
Maybe news lost this...
/Jon
--
Jon Anthony
Organon Motives, Inc.
Belmont, MA 02178
617.484.3383
jsa@organon.com
next prev parent reply other threads:[~1996-11-08 0:00 UTC|newest]
Thread overview: 250+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-10-08 0:00 Once again, Ada absent from DoD SBIR solicitation Gregory Aharonian
1996-10-08 0:00 ` Gandalf
1996-10-09 0:00 ` Bill Nielsen
1996-10-09 0:00 ` Stanley R. Allen
1996-10-09 0:00 ` C++ Standardization (was: Once again, Ada absent from DoD SBIR solicitation) David Shochat
1996-10-10 0:00 ` Robert Dewar
1996-10-10 0:00 ` David Shochat
1996-10-20 0:00 ` Richard Riehle
1996-10-20 0:00 ` nasser
1996-10-21 0:00 ` Shayne Flint
1996-10-21 0:00 ` Robert A Duff
1996-10-21 0:00 ` Robert Dewar
1996-10-22 0:00 ` Ken Garlington
1996-10-22 0:00 ` Shayne Flint
1996-10-22 0:00 ` Robert A Duff
1996-10-22 0:00 ` Rush Kester
1996-10-11 0:00 ` Ed Falis
1996-10-11 0:00 ` Robert Dewar
1996-10-12 0:00 ` Kevin D. Heatwole
1996-10-12 0:00 ` Robert Dewar
1996-10-13 0:00 ` Larry Kilgallen
1996-10-13 0:00 ` Ed Falis
1996-10-11 0:00 ` Dave Wood
1996-10-11 0:00 ` Dave Wood
1996-10-17 0:00 ` Garbage Collection in Ada Thomas Kendelbacher
1996-10-10 0:00 ` Once again, Ada absent from DoD SBIR solicitation Mike Stark
1996-10-10 0:00 ` Stanley R. Allen
1996-10-11 0:00 ` Mitch Gart
1996-10-11 0:00 ` Robert Dewar
1996-10-14 0:00 ` Mitch Gart
1996-10-14 0:00 ` Ken Garlington
1996-10-11 0:00 ` Ken Garlington
1996-10-14 0:00 ` Norman H. Cohen
1996-10-14 0:00 ` Bevin R. Brett
1996-10-10 0:00 ` Mitch Gart
1996-10-10 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Brian Rogoff
1996-10-10 0:00 ` Dave
1996-10-11 0:00 ` Robert Dewar
1996-10-12 0:00 ` davedave
1996-10-12 0:00 ` Robert Dewar
1996-10-13 0:00 ` Larry Kilgallen
1996-10-11 0:00 ` Tucker Taft
1996-10-14 0:00 ` Brian Rogoff
1996-10-15 0:00 ` Mitch Gart
1996-10-15 0:00 ` Larry Kilgallen
1996-10-15 0:00 ` Mark A Biggar
1996-10-16 0:00 ` Brian Rogoff
1996-10-28 0:00 ` Kenneth Almquist
1996-10-29 0:00 ` Invoking parental methods (was: Java vs Ada 95) Larry Kilgallen
1996-10-31 0:00 ` Kenneth Almquist
1996-10-31 0:00 ` Larry Kilgallen
1996-11-05 0:00 ` Mitch Gart
1996-11-05 0:00 ` Larry Kilgallen
1996-11-09 0:00 ` Joel VanLaven
1996-11-05 0:00 ` Tucker Taft
1996-11-05 0:00 ` Larry Kilgallen
1996-11-06 0:00 ` Robert A Duff
1996-11-06 0:00 ` Larry Kilgallen
1996-11-06 0:00 ` Robert I. Eachus
1996-11-07 0:00 ` David Wheeler
1996-11-06 0:00 ` Mitch Gart
1996-11-08 0:00 ` Jon S Anthony [this message]
1996-11-08 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert A Duff
1996-10-15 0:00 ` Robert Dewar
1996-10-15 0:00 ` Portability of Arithmetic (was: Java vs Ada 95) Larry Kilgallen
1996-10-16 0:00 ` Robert A Duff
1996-10-16 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Larry Kilgallen
1996-10-18 0:00 ` Robert A Duff
1996-10-17 0:00 ` Robert Dewar
1996-10-18 0:00 ` Larry Kilgallen
1996-10-18 0:00 ` Robert A Duff
1996-10-18 0:00 ` Norman H. Cohen
1996-10-18 0:00 ` Robert Dewar
1996-10-18 0:00 ` Brian R. Hanson
1996-10-19 0:00 ` Robert Dewar
1996-10-19 0:00 ` Larry Kilgallen
1996-10-22 0:00 ` Once again, Ada absent from DoD SBIR solicitation Dale Stanbrough
1996-10-27 0:00 ` Robert Dewar
1996-10-21 0:00 ` Portability of Arithmetic (was: Java vs Ada 95) Norman H. Cohen
1996-10-21 0:00 ` Robert Dewar
1996-10-21 0:00 ` Norman H. Cohen
1996-10-21 0:00 ` Robert Dewar
1996-10-22 0:00 ` Larry Kilgallen
1996-10-23 0:00 ` Robert Dewar
1996-10-23 0:00 ` Larry Kilgallen
1996-10-23 0:00 ` Norman H. Cohen
1996-10-21 0:00 ` Lance Kibblewhite
1996-10-17 0:00 ` Stephen Leake
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Larry Kilgallen
1996-10-18 0:00 ` Robert A Duff
1996-10-17 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Alan Brain
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Robert Dewar
1996-10-18 0:00 ` Keith Thompson
1996-10-20 0:00 ` Alan Brain
1996-10-24 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Mike Stark
1996-10-15 0:00 ` Robert Dewar
1996-10-16 0:00 ` Mike Stark
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Why no Propagates? Matthew Heaney
1996-10-18 0:00 ` Robert A Duff
1996-10-18 0:00 ` Norman H. Cohen
1996-10-18 0:00 ` Robert Dewar
1996-10-18 0:00 ` Robert Dewar
1996-10-16 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Brian Rogoff
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Brian Rogoff
1996-10-16 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Robert Dewar
1996-11-22 0:00 ` Van Snyder
1996-11-25 0:00 ` Java vs Ada vs Inferno, floating point arithmetic Anssi Porttikivi
1996-10-11 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Stephen Leake
1996-10-11 0:00 ` Dave
1996-10-11 0:00 ` Robert Dewar
1996-10-12 0:00 ` Dave
1996-10-12 0:00 ` Robert Dewar
1996-10-14 0:00 ` Keith Thompson
1996-10-18 0:00 ` Why no Propagates? Michel Gauthier
1996-10-22 0:00 ` Richard A. O'Keefe
1996-10-23 0:00 ` Michel Gauthier
1996-10-11 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Mitch Gart
1996-10-11 0:00 ` Jon S Anthony
1996-10-11 0:00 ` Jon S Anthony
1996-10-12 0:00 ` Robert Dewar
1996-10-14 0:00 ` Mitch Gart
1996-10-14 0:00 ` Brian R. Hanson
1996-10-14 0:00 ` Keith Thompson
1996-10-15 0:00 ` Dale Stanbrough
1996-10-15 0:00 ` Brian R. Hanson
1996-10-20 0:00 ` nasser
1996-10-12 0:00 ` davedave
1996-10-12 0:00 ` Robert Dewar
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Brian Rogoff
1996-10-14 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Robert Dewar
1996-10-15 0:00 ` Robert A Duff
1996-10-15 0:00 ` Larry Kilgallen
1996-10-16 0:00 ` Lars Farm
1996-10-16 0:00 ` Robert Dewar
1996-10-17 0:00 ` Why no Free? Matthew Heaney
1996-10-18 0:00 ` John Herro
1996-10-19 0:00 ` John Herro
1996-10-18 0:00 ` Robert A Duff
1996-10-18 0:00 ` Robert Dewar
1996-10-15 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert I. Eachus
1996-10-15 0:00 ` Robert Dewar
1996-10-15 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Brian Rogoff
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-18 0:00 ` Keith Thompson
1996-10-16 0:00 ` Jon S Anthony
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert Dewar
1996-10-16 0:00 ` Samuel T. Harris
1996-10-18 0:00 ` Jon S Anthony
1996-10-18 0:00 ` Jon S Anthony
1996-10-18 0:00 ` Jon S Anthony
1996-10-29 0:00 ` Kenneth Almquist
1996-10-29 0:00 ` Robert Dewar
1996-10-31 0:00 ` Kenneth Almquist
1996-10-29 0:00 ` Robert I. Eachus
1996-10-29 0:00 ` Jon S Anthony
1996-10-30 0:00 ` Stephen Leake
1996-10-31 0:00 ` Lars Farm
1996-10-31 0:00 ` Kenneth Almquist
1996-10-31 0:00 ` Jon S Anthony
1996-11-01 0:00 ` Robert I. Eachus
1996-11-01 0:00 ` Robert A Duff
[not found] ` <55gkch$gg6@fozzie.sun3.iaf.nl>
1996-11-03 0:00 ` Robert A Duff
1996-11-03 0:00 ` Robert Dewar
1996-11-04 0:00 ` Larry Kilgallen
1996-11-04 0:00 ` Robert Dewar
1996-11-05 0:00 ` Fast locking (Was Re: Java vs Ada 95) Geert Bosch
1996-11-06 0:00 ` Larry Kilgallen
1996-11-06 0:00 ` Geert Bosch
1996-11-07 0:00 ` Larry Kilgallen
1996-11-07 0:00 ` Robert Dewar
1996-11-11 0:00 ` Norman H. Cohen
1996-11-08 0:00 ` Geert Bosch
1996-11-06 0:00 ` Robert Dewar
1996-11-02 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert Dewar
1996-11-04 0:00 ` Robert I. Eachus
1996-11-05 0:00 ` Larry Kilgallen
1996-11-14 0:00 ` Robert Dewar
1996-11-16 0:00 ` Robert A Duff
1996-11-16 0:00 ` Robert Dewar
1996-11-17 0:00 ` Unbounded strings (Was: Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation)) Robert A Duff
1996-11-18 0:00 ` Robert Dewar
1996-11-19 0:00 ` Joel VanLaven
1996-11-23 0:00 ` Robert Dewar
1996-11-19 0:00 ` Robert A Duff
1996-11-23 0:00 ` Robert Dewar
1996-11-24 0:00 ` Robert A Duff
1996-11-25 0:00 ` Norman H. Cohen
1996-11-27 0:00 ` Robert Dewar
1996-11-21 0:00 ` Robert I. Eachus
1996-11-24 0:00 ` Robert Dewar
1996-11-24 0:00 ` Fergus Henderson
1996-11-24 0:00 ` Robert Dewar
1996-11-25 0:00 ` Kevin D. Heatwole
1996-11-25 0:00 ` Robert A Duff
1996-11-26 0:00 ` Kevin D. Heatwole
1996-11-26 0:00 ` Robert A Duff
1996-11-26 0:00 ` Larry Kilgallen
1996-11-27 0:00 ` Robert Dewar
1996-11-27 0:00 ` Norman H. Cohen
1996-11-29 0:00 ` Fergus Henderson
1996-11-29 0:00 ` Robert A Duff
1996-11-26 0:00 ` Geert Bosch
1996-11-26 0:00 ` Robert Dewar
1996-11-25 0:00 ` Robert I. Eachus
1996-11-20 0:00 ` Jon S Anthony
1996-11-24 0:00 ` Robert Dewar
1996-11-16 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Geert Bosch
1996-11-17 0:00 ` Robert Dewar
1996-11-17 0:00 ` Robert A Duff
1996-11-18 0:00 ` Robert Dewar
1996-11-19 0:00 ` Robert A Duff
1996-11-18 0:00 ` Geert Bosch
1996-11-22 0:00 ` Robert Dewar
1996-11-18 0:00 ` Norman H. Cohen
1996-11-06 0:00 ` Robert I. Eachus
1996-10-11 0:00 ` Ada and the DoD HLA (was: " John Cosby
1996-10-13 0:00 ` Java vs Ada 95 (Was " Hannes Haug
1996-11-03 0:00 ` Hannes Haug
1996-11-06 0:00 ` Fast locking (Was Re: Java vs Ada 95) Hannes Haug
1996-11-06 0:00 ` Hannes Haug
1996-10-11 0:00 ` Once again, Ada absent from DoD SBIR solicitation Matthew M. Lih
1996-10-18 0:00 ` Rush Kester
1996-10-21 0:00 ` C++ Standardization (was: Once again, Ada absent from DoD SBIR solicitation) David Emery
1996-10-10 0:00 ` Jon S Anthony
1996-10-11 0:00 ` Jon S Anthony
1996-10-22 0:00 ` Tarjei Jensen
1996-10-22 0:00 ` C++ Standardization (was: Once again, Ian Ward
1996-11-01 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Jon S Anthony
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