[vtkusers] Why can you make an instance of vtkRenderer - it is abstract !?

[Morten Høgholm Pedersen]

Hi,

How come, it is possible (according to the examples) to make objects using
vtkRenderer when it is actually an abstract class (containing pure virtual
functions)?
According to the C++ reference I have (Stoustrup) that is not possible - or
am I missing something

Sincerely,

Morten H Pedersen,
mhp at dadlnet.dk