[vtkusers] stack-like push function for vtkIdList()

[Luca Penasa]

hi everybody, 
	is there an efficent way to implement a stack-like push on vtkIdlist
objects (put an id at element 0 of list)??

Thank you


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Luca Penasa
Student at Geosciences Dpt.
University of Padua (IT)
luca.penasa at email.it
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