[vtkusers] Forward declaring vtkSmartPointer

[David Doria]

I thought Jeff had resolved this the other day, but it is cropping up again.
(here is an example:
http://www.rpi.edu/~doriad/VTK_List/ForwardDeclareSmartPointer/ )

The thought was that we could correctly forward declare a template class:

template <typename T> class vtkSmartPointer;

so that it could be used to define a member variable:

private:
vtkSmartPointer<vtkTransform> Transform;

However, I'm getting:
error: field 'Transform' has incomplete type

Any idea why this would be?

Thanks,

David
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