From: Brian May <bam@snoopy.apana.org.au>
Subject: Re: Is this a bug?
Date: Fri, 24 Sep 2004 08:26:34 +1000
Date: 2004-09-24T08:26:34+10:00 [thread overview]
Message-ID: <sa4mzzg62qt.fsf@snoopy.apana.org.au> (raw)
In-Reply-To: 2rg6a1F1arg02U1@uni-berlin.de
>>>>> "Nick" == Nick Roberts <nick.roberts@acm.org> writes:
Nick> Wojtek Narczynski wrote:
>> Okay, I wasn't thinking. It obviously isn't a compiler bug.
Nick> To clarify (hopefully), there is a line which changes the
Nick> value of Current_Hook:
Nick> Current_Hook := Current_Hook.all.Down'Unchecked_Access;
Nick> The value of Current would not have been changed by this
Nick> statement, so it would presumably have been left referring
Nick> to the wrong thing. The code shown is quite complex, and
Nick> Wojtek can be forgiven for initially missing this (in my
Nick> humble opinion).
So another words, if I did the following:
declare
...
Current : Bucket_Access renames Current_Hook.all;
begin
...
Current_Hook := <something else>
...
end;
Then Current would still be the same object and value it use to be?
If so, then "renames" isn't quite as simple as I thought. It is more
like a "hard link" then a "symbolic link". i.e. it links to the object
rather then the name of the object. Interesting.
Question: If you freed the value (with unchecked_deallocate) of
"Current_Hook" would the value of "Current" still be valid? I suspect
it would not be valid, as "Current" is now dangling.
--
Brian May <bam@snoopy.apana.org.au>
next prev parent reply other threads:[~2004-09-23 22:26 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-23 0:52 Is this a bug? Wojtek Narczynski
2004-09-23 8:35 ` Wojtek Narczynski
2004-09-23 14:52 ` Nick Roberts
2004-09-23 22:26 ` Brian May [this message]
2004-09-24 0:28 ` Stephen Leake
2004-09-24 0:57 ` Jeffrey Carter
2004-09-24 12:47 ` Wojtek Narczynski
2004-09-25 0:17 ` Brian May
2004-09-24 12:37 ` Wojtek Narczynski
2004-09-23 11:27 ` Jeff C r e e.m
2004-09-24 0:30 ` Stephen Leake
2004-09-24 1:49 ` Jeff C r e e.m
2004-09-25 12:59 ` Stephen Leake
2004-10-04 16:36 ` Warren W. Gay VE3WWG
-- strict thread matches above, loose matches on Subject: below --
2019-12-30 15:44 reinert
2019-12-30 17:51 ` Anh Vo
2019-12-30 18:41 ` Niklas Holsti
2019-12-30 19:50 ` reinert
2019-12-30 20:11 ` Dmitry A. Kazakov
2019-12-30 23:16 ` Randy Brukardt
2019-12-31 19:40 ` Optikos
2019-12-31 21:50 ` Randy Brukardt
2020-01-02 9:34 ` Dmitry A. Kazakov
2020-01-03 7:26 ` reinert
2020-01-03 7:35 ` reinert
2020-01-03 8:37 ` Dmitry A. Kazakov
2020-01-04 0:42 ` Randy Brukardt
2020-01-05 13:32 ` reinert
2020-01-06 10:43 ` J-P. Rosen
2020-01-06 12:19 ` Tero Koskinen
2020-01-17 9:54 ` reinert
2020-01-17 10:08 ` Dmitry A. Kazakov
2020-01-17 22:14 ` Randy Brukardt
2019-12-31 6:08 ` J-P. Rosen
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