|  | VTK
    9.0.1
    | 
 
 
 
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   24 #ifndef vtkInformationExecutivePortVectorKey_h 
   25 #define vtkInformationExecutivePortVectorKey_h 
   27 #include "vtkCommonExecutionModelModule.h"  
  
Superclass for all pipeline executives in VTK.
a simple class to control print indentation
Detect and break reference loops.