[PyQt] Keeping references to parent objects
phil at riverbankcomputing.com
Tue Mar 17 10:36:22 GMT 2015
On 17/03/2015 9:17 am, Florian Bruhin wrote:
> http://stackoverflow.com/a/11945184 says this:
> - A QObject should generally not have a reference to its parent or
> any of its ancestors (weak references are ok). This will cause
> memory leaks at best and occasional crashes as well.
> - Objects that reference their parent or any ancestor can cause an
> exit crash.
> Is this true? Is there more information about this somewhere?
> I usually use signals, but there are some instances where it'd be
> useful if an object kept a reference to its parent. Should I use
> weakref for that everywhere?
No, just use an ordinary reference. An object keeps an internal
reference to the parent anyway, one more isn't going to make a
The only case where you might have problems is a QObject that is created
internally by Qt and then exposed through the API. It is missing the
plumbing used to detect if it gets deleted by C++. However those cases
are very rare.
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