Yes, interally, IIRC it is a QList, and suffer/enjoys all the traits of such.
And FWIW, I think deleting children inthe order they were added makes the most
sense. If you need your backwards behavior you are really implying that B is a
child of A, and if created as such, you would get the behavior you describe...
________________________________
From: Andreas Pakulat <ap...@gmx.de>
To: Jochen Becher <jochen_bec...@gmx.de>
Cc: interest@qt-project.org
Sent: Tuesday, June 12, 2012 2:45 PM
Subject: Re: [Interest] Automatic deletion of children of QObject
Hi,
On Tue, Jun 12, 2012 at 8:37 PM, Jochen Becher <jochen_bec...@gmx.de> wrote:
Hi,
>
>Think of the following code:
>
>
>QObject *parent = new QObject();
>QObject *childA = new QObject(parent);
>QObject *childB = new QObject)parent);
>
>delete parent;
>
>
>In which order would you expect childA and childB gets deleted? I would
>expect childB first and childA second. This would be same behavior as in
>using normal variables:
>
>QObject parent;
>QObject childA(&parent);
>QObject childB(&parent);
>
>Here, on leaving the scope childB would be deleted first, childA second
>and parent last.
>
>Isn't it a bug in Qt to delete children in the same order there were
>added to a parent instead of the reverse order?
>
No, Qt makes no such guarantees. In fact it doesn't guarantee any specific
order of destruction for the children, if you rely on any order here, your code
is buggy.
Its also not possible to actually do this, since you can add/remove childs from
the list during the runtime of the program and the QObject cannot know wether
the last-added object is really the one to be destroyed first (in your ideal
scenario) or wether its maybe the one created first but was removed and
re-added later.
Since QObject keeps an ordered list of its children, I think its reasonable
that they simply run over it from beginning to end and destroy the childs
instead of going through the extra hoop of running from end to beginning.
Andreas
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