[vtkusers] "class" at the top

[de Boer Ingo]

Hi,

> What do lines 61 and 62 mean?? I've never really seen that 
> syntax..
It's a foward declaration of the class instead of including
the header. You won't need that, if you don't need these
classes in your own classes... This is C++ stuff, not 
directly VTK...

greets
  Ingo

---
Dr.-Ing. Ingo H. de Boer

Polytec GmbH
Polytec-Platz 1-7, 76337 Waldbronn, Germany
phone: ++49 7243 604 106
fax  : ++49 7243 604 255