[PyQt] sip: wrong class virtual function being called

[Jeremy Sanders]

Hi -

I'm having a problem with sip where the wrong version of a virtual 
function is being called. I'm overriding a virtual function in a python 
subclass of a C++ class. This function is being called by a C++ 
container, which owns the class instance. If I keep a Python reference 
to the instance, then everything works.

Please see the attached code. test.py calls the C++ code. Normally the 
code prints

Object::func()
42

If del in test.py is uncommented, then it prints

Object::func()
Object::func()

Therefore the inherited virtual function is being called, not the 
overriding function.

Is this a problem with my code, or a SIP bug? I'm using SIP 4.16.3 (on 
Ubuntu x86-64). Is there a workaround? I can change the C++ code.

Thanks

Jeremy
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%Module(name=mytest, version=0)

class Object
{
%TypeHeaderCode
#include <mytest.h>
%End
  public:
   virtual ~Object();
   virtual void func();
};

class ObjectContainer : public Object
{
%TypeHeaderCode
#include <mytest.h>
%End
 public:
  ~ObjectContainer();
  void addObject(Object* obj /Transfer/);
  void callFuncs();
};

class Scene
{
%TypeHeaderCode
#include <mytest.h>
%End

 public:
  Scene();
  ObjectContainer root;
};
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