From: jvl@ocsystems.com (Joel VanLaven)
Subject: Re: Invoking parental methods (was: Java vs Ada 95)
Date: 1996/11/09
Date: 1996-11-09T00:00:00+00:00 [thread overview]
Message-ID: <1996Nov9.200813.14127@ocsystems.com> (raw)
In-Reply-To: 1996Nov5.084722.1@eisner
Larry Kilgallen (kilgallen@eisner.decus.org) wrote:
: In article <E0ED6w.24D.0.-s@inmet.camb.inmet.com>, mg@harp.camb.inmet.com (Mitch Gart) writes:
: > Larry Kilgallen (kilgallen@eisner.decus.org) wrote:
: >
: > : But the dangling reference seems to be precipitated by the
: > : the pointer object, not by the the pointer type.
: > : What is wrong with:
: >
: > : type super is access all parent_obj; -- this line may get changed
: >
: > : procedure p_first(param: access child_obj) is
: > : begin
: > : ...
: > : p_first(super(param)); -- call the parent's p_first
: > : ...
: > : end p_first;
: >
: > This is the trap I fell into the first time I tried to write this code.
: > The above solution doesn't work because the type conversion super(param)
: > converts param into a pointer to the parent type, but tag inside the
: > object that is pointed to still says the object is a child_obj, not a
: > parent_obj, so the call dispatches to the wrong place. This line
: >
: > : p_first(super(param)); -- call the parent's p_first
: >
: > in fact doesn't call the parent's p_first, in spite of the comment. If
: > the object pointed to by "param" is a child_obj this call is an infinite
: > resursion.
I didn't see the original post, but from what I undeerstand of Ada95, this
ought to behave as you seemed to originally intend. The way I understand it
is if you don't use 'class anywhere (including in the declaration of super)
then no dispatching takes place. If it is taking place then I would bet on
a compiler bug. If you could provide a test case that demonstrates the
problem you are having (preferably in e-mail as I missed the original post)
I would love to test it out on our compiler. Remember, if you can make
mistakes (especially interpreting RM rules) then compiler vendors sure can
too.
--
-- Joel VanLaven
next prev parent reply other threads:[~1996-11-09 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 ` Shayne Flint
1996-10-22 0:00 ` Robert A Duff
1996-10-22 0:00 ` Ken Garlington
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 ` 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
1996-10-11 0:00 ` Tucker Taft
1996-10-14 0:00 ` Brian Rogoff
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 ` Robert Dewar
1996-10-18 0:00 ` Norman H. Cohen
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 A Duff
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 ` 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 ` Larry Kilgallen
1996-10-18 0:00 ` Robert A Duff
1996-10-17 0:00 ` Stephen Leake
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
1996-10-15 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert Dewar
1996-10-17 0:00 ` 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 ` 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 ` 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 ` Robert I. Eachus
1996-11-08 0:00 ` Jon S Anthony
1996-11-05 0:00 ` Larry Kilgallen
1996-11-09 0:00 ` Joel VanLaven [this message]
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
1996-10-18 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
1996-10-12 0:00 ` Robert Dewar
1996-10-14 0:00 ` Brian R. Hanson
1996-10-14 0:00 ` Mitch Gart
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
1996-10-11 0:00 ` Jon S Anthony
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 ` 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
1996-10-14 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Jon S Anthony
1996-10-14 0:00 ` Brian Rogoff
1996-10-15 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Brian Rogoff
1996-10-15 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Robert Dewar
1996-10-16 0:00 ` Jon S Anthony
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 ` Jon S Anthony
1996-10-18 0:00 ` Keith Thompson
1996-10-16 0:00 ` Samuel T. Harris
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
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 ` Jon S Anthony
1996-10-29 0:00 ` Robert I. Eachus
1996-10-29 0:00 ` Kenneth Almquist
1996-10-29 0:00 ` Robert Dewar
1996-10-31 0:00 ` Kenneth Almquist
1996-10-30 0:00 ` Stephen Leake
1996-10-31 0:00 ` Lars Farm
1996-10-31 0:00 ` Jon S Anthony
1996-10-31 0:00 ` Kenneth Almquist
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 ` Norman H. Cohen
1996-11-18 0:00 ` Geert Bosch
1996-11-22 0:00 ` Robert Dewar
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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