[Paraview] Instanciating an unknown type

[Fred Fred]

My problem is as follow: I am writing a vtkDataSetAlgorithm filter and I need to create the ouput dataset, which must be of the same type as the input.
Is there a one-line way to do it, ie avoiding if (input->IsA("vtkPolyData") output=vtkPolyData::New(); else if ... ?

 		 	   		  
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