[vtkusers] convert vtkDataObject to vtkDataSet

[Natalie Happenhofer]

Hi!
I´d like to convert a vtkDataObject to a vtkDataSet. As vtkDataObject is a superclass for vtkDataSet, I tried

vtkDataSet* A = vtkDataSet::SafeDownCast(B);

where B is a vtkDataObject, but I compiling I get the error 

" error: invalid conversion from 'vtkDataObject*' to 'vtkDataSet*' "

Looking in the documentation, there seems to be a class called "vtkDataObjectToDataSet", which seems to be exactly what I want, but I don´t find any documentation on it or any advice how to use it. 

thx for help,
Natalie Happenhofer

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