[vtkusers] simple question about objects

[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....

bob.




      
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