[vtkusers] object existence

[Haider Syed]

Hi,

I have an instance of vtkContourWidget declared, call it 
cwidget.  I have a delete button for this instance and I need to check 
if the instance exists or not.  How can I check if cwidget exists or 
not.  This may have something to do with reference counting but I don't 
understand this concept fully....





      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20100706/df19a26b/attachment.htm>