C++ class inheritance using shadow class

Hi there,

I've been using Swig successfully for a while now but I'm stuck with 
this one!

I've got a basic C++ class:


class System
{
   public:
       System(void);
       float Dt;
       float VoxelSize;
       int NVoxelX, NVoxelY,NVoxelZ;
       Vector SimulationBoxOrigin;
};

inline System::System(void)
{
   Dt = 0;
   VoxelSize = 0;
   NVoxelX = NVoxelY = NVoxelZ = 0;
   SimulationBoxOrigin = Vector(0,0,0);
}

I then swig it using shadow classes, that works fine. Now I would like 
to add extra python features to this classes, so I want to use inheritance.

>>> class Sys(System):
...     def __init__(self):
...             print Sys.VoxelSize
...
>>> c = Sys()
<property object at 0x818ce24>
>>> c.VoxelSize
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
TypeError: Type error. Expected _p_System
>>>

The inheritance doesn't seem to work! Any reason why that should be??
Looking forward to your suggestions,

Alex


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