From: "Pat Rogers" <progers@classwide.com>
Subject: Re: Refactoring and Ada
Date: Fri, 22 Feb 2002 14:37:28 GMT
Date: 2002-02-22T14:37:28+00:00 [thread overview]
Message-ID: <IIsd8.60275$Y8.4279089199@newssvr30.news.prodigy.com> (raw)
In-Reply-To: u78hac6o7iku15@corp.supernews.com
"Randy Brukardt" <randy@rrsoftware.com> wrote in message
news:u78hac6o7iku15@corp.supernews.com...
> >No, I was asking for the exegesis in terms of the RM for Richard's much
> more sweeping "comdemnation" of the attribute. ("Condemnation" is too
> strong here, but you get the idea.)
>
> Reading AI-167 might help some
> (http://www.ada-auth.org/cgi-bin/cvsweb.cgi/AIs/AI-00167.TXT?rev=1.5).
> But this AI is still under construction (it is not, and never has been,
> approved, contrary to the statement of someone else here), and
> undoubtably will change.
<snip>
> The problem rule is 13.9.1(12), which makes the CALL to
> Unchecked_Conversion erroneous if the result is invalid. And this rule
> is intended (I forget why, Bob?).
Thanks (again) for the pointer to the AI in progress. Clearly there is a
problem for unchecked conversion in this case.
However, unchecked conversion isn't the only way to get the value to which
'Valid is applied. For example, via RM 13.9.2(11):
P : aliased Positive;
K : Integer;
for K'Address use P'Address;
begin
K := 0;
if P'Valid then ...
or, for that matter, via System.Address_To_Access_Conversions (for Integer in
this example).
The OP's saying that 'Valid is useless isn't justified by the problem with
unchecked conversion, IMHO.
What am I missing?
Pat
next prev parent reply other threads:[~2002-02-22 14:37 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-01 15:13 Refactoring and Ada Paul Anderson
2002-02-02 17:48 ` Nick Roberts
2002-02-02 20:36 ` Pat Rogers
2002-02-03 0:21 ` Nick Roberts
2002-02-03 13:53 ` Robert Dewar
2002-02-03 19:23 ` Nick Roberts
2002-02-04 2:17 ` Robert Dewar
2002-02-04 20:48 ` Nick Roberts
2002-02-04 22:31 ` Pat Rogers
2002-02-04 22:43 ` Marin David Condic
2002-02-06 2:51 ` Nick Roberts
2002-02-03 18:50 ` Simon Wright
2002-02-04 4:32 ` Richard Riehle
2002-02-04 12:28 ` David C. Hoos, Sr.
2002-02-04 17:03 ` Richard Riehle
2002-02-06 17:19 ` Robert A Duff
2002-02-04 17:59 ` Robert Dewar
2002-02-04 18:50 ` Pascal Obry
2002-02-05 1:07 ` Robert Dewar
2002-02-05 1:44 ` Richard Riehle
2002-02-06 17:42 ` Robert A Duff
2002-02-06 17:32 ` Robert A Duff
2002-02-07 8:45 ` Dr. Michael Paus
2002-02-07 13:54 ` Pat Rogers
2002-02-03 13:48 ` Robert Dewar
2002-02-03 19:38 ` Nick Roberts
2002-02-04 2:20 ` Robert Dewar
2002-02-08 21:21 ` Paul Anderson
2002-02-03 9:45 ` Volkert
2002-02-04 0:06 ` Refactoring and Ada (tool I'd like to have...) David Emery
2002-02-08 9:24 ` Refactoring and Ada Martin Dowie
2002-02-08 15:15 ` Ted Dennison
2002-02-08 15:52 ` Pat Rogers
2002-02-08 16:07 ` OT : " martin.m.dowie
2002-02-08 17:11 ` Pat Rogers
2002-02-09 19:46 ` martin.m.dowie
2002-02-09 23:04 ` Pat Rogers
2002-02-10 13:57 ` Martin Dowie
2002-02-08 16:06 ` martin.m.dowie
2002-02-08 17:07 ` Pat Rogers
2002-02-09 19:48 ` martin.m.dowie
2002-02-09 23:05 ` Pat Rogers
2002-02-10 1:30 ` Marc A. Criley
2002-02-10 2:58 ` tmoran
2002-02-11 15:27 ` Marin David Condic
2002-02-12 19:16 ` Simon Wright
2002-02-15 19:43 ` Marin David Condic
2002-02-15 20:33 ` Matthew Heaney
2002-02-15 21:40 ` Larry Kilgallen
2002-02-19 16:54 ` Matthew Heaney
2002-02-19 19:39 ` Larry Kilgallen
2002-02-20 4:23 ` Richard Riehle
2002-02-20 5:20 ` Mark Biggar
2002-02-20 9:58 ` Pat Rogers
2002-02-20 17:14 ` Matthew Heaney
2002-02-20 17:18 ` Pat Rogers
2002-02-20 18:08 ` Matthew Heaney
2002-02-20 22:12 ` Pat Rogers
2002-02-23 22:48 ` Robert Dewar
2002-02-21 0:41 ` Randy Brukardt
2002-02-21 1:31 ` Pat Rogers
2002-02-22 14:37 ` Pat Rogers [this message]
2002-02-22 21:23 ` Randy Brukardt
2002-02-23 23:04 ` Robert Dewar
2002-02-25 20:26 ` Randy Brukardt
2002-02-23 23:21 ` Robert Dewar
2002-02-23 22:58 ` Robert Dewar
2002-02-23 22:55 ` Robert Dewar
2002-02-26 1:05 ` Nick Roberts
-- strict thread matches above, loose matches on Subject: below --
2002-02-05 6:15 Christoph Grein
2002-02-07 11:26 Christoph Grein
2002-02-07 18:31 ` Dr. Michael Paus
2002-02-08 12:45 ` Robert Dewar
2002-02-08 17:20 ` Dr. Michael Paus
2002-02-20 6:19 Christoph Grein
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox