From: mosteo@gmail.com (Alex R. Mosteo)
Subject: Re: Memory leak - What the ...?
Date: 12 Oct 2004 07:47:33 -0700
Date: 2004-10-12T07:47:33-07:00 [thread overview]
Message-ID: <dcb57d1e.0410120647.560af6a@posting.google.com> (raw)
In-Reply-To: mailman.282.1097576360.390.comp.lang.ada@ada-france.org
Marius Amado Alves <amado.alves@netcabo.pt> wrote in message news:<mailman.282.1097576360.390.comp.lang.ada@ada-france.org>...
> I still lack an understandable explanation of why this does not leak:
>
> if This.Data /= null then
> This.Data := new Stream_Element_Array'(This.Data.all);
> end if;
Adjust is called just after the members of the record have been
copied. So imagine you have
A := B;
When Adjust(A) gets called, you will have
A.Data = B.Data
Since Data is an access type, you have a shallow copy where both A and
B have members pointing to the same heap space.
In the Adjust, what A does is replicate the pointed data to get a new
pointer and a deep copy where A and B point to different heap copies.
Additionally, before A being overwritten, Finalize(A) is called just
in case it needs to free some memory.
Hope this helps.
next prev parent reply other threads:[~2004-10-12 14:47 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-10 21:33 Memory leak - What the ...? Alex R. Mosteo
2004-10-10 22:05 ` Marius Amado Alves
2004-10-11 8:18 ` Alex R. Mosteo
2004-10-11 11:04 ` Marius Amado Alves
2004-10-11 13:02 ` Martin Krischik
2004-10-11 8:25 ` Martin Krischik
2004-10-11 8:56 ` Martin Dowie
2004-10-11 12:59 ` Martin Krischik
2004-10-11 1:40 ` Stephen Leake
2004-10-11 8:59 ` Alex R. Mosteo
2004-10-11 18:24 ` Stephen Leake
2004-10-12 3:02 ` Brian May
2004-10-12 8:45 ` Jean-Pierre Rosen
[not found] ` <mailman.282.1097576360.390.comp.lang.ada@ada-france.org>
[not found] ` <uvegkc.jrg.ln@skymaster>
2004-10-12 12:31 ` Marius Amado Alves
2004-10-12 14:47 ` Alex R. Mosteo [this message]
2004-10-12 16:05 ` Marius Amado Alves
2004-10-12 19:37 ` Björn Persson
2004-10-12 22:10 ` Marius Amado Alves
[not found] ` <416C5646.1020506@netcabo.pt>
2004-10-13 0:17 ` Stephen Leake
[not found] ` <u655f1ng9.fsf@acm.org>
2004-10-13 6:24 ` Marius Amado Alves
[not found] ` <416C00D6.90402@netcabo.pt>
2004-10-13 0:14 ` Stephen Leake
[not found] ` <416BAFA4.7020400@netcabo.pt>
2004-10-13 0:07 ` Stephen Leake
2004-10-13 13:45 ` Hyman Rosen
2004-10-14 9:15 ` Martin Krischik
2004-10-14 17:21 ` Hyman Rosen
[not found] ` <uis9f1nw3.fsf@acm.org>
[not found] ` <mailman.301.1097650377.390.comp.lang.ada@ada-france.org>
2004-10-13 7:40 ` Dmitry A. Kazakov
2004-10-13 17:44 ` Mark Lorenzen
2004-10-14 8:03 ` Dmitry A. Kazakov
2004-10-18 0:33 ` Brian May
2004-10-12 12:05 ` Alex R. Mosteo
2004-10-13 0:12 ` Stephen Leake
2004-10-13 8:39 ` Pascal Obry
2004-10-13 13:11 ` Memory leak - What the ...? - FOUND Alex R. Mosteo
2004-10-17 0:45 ` Memory leak - What the ...? Brian May
2004-10-13 0:32 ` Matthew Heaney
2004-10-18 0:26 ` Brian May
2004-10-13 0:27 ` Matthew Heaney
2004-10-13 7:58 ` Martin Krischik
2004-10-13 13:01 ` Alex R. Mosteo
2004-10-13 0:25 ` Matthew Heaney
2004-10-13 12:26 ` Stephen Leake
2004-10-13 14:45 ` Matthew Heaney
2004-10-13 23:45 ` Brian May
2004-10-14 1:33 ` Jeffrey Carter
2004-10-11 8:04 ` Martin Dowie
2004-10-12 10:47 ` Alex R. Mosteo
2004-10-12 15:07 ` Alex R. Mosteo
2004-10-13 14:53 ` Matthew Heaney
-- strict thread matches above, loose matches on Subject: below --
2004-10-11 9:50 Christoph Karl Walter Grein
2004-10-11 10:21 Christoph Karl Walter Grein
2004-10-14 4:30 Christoph Karl Walter Grein
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