[vtkusers] Creating a new vtkDataSet object

[David Cole]

> vtkDataSet * myDataSet = vtkDataSet::SafeDownCast(myDataSet);
      
> and I get NULL. What I am doing wrong here?




You’re also passing an uninitialized value as the parameter to SafeDownCast if your code looks exactly like your email (or is that a typo?)... You’re lucky to be getting NULL back, and not a crash. The argument to SafeDownCast should be a valid pointer to an instance of some class derived from vtkDataSet in order to return non-NULL.



HTH,

David C.
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