|  | VTK
    9.0.1
    | 
 
 
 
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   23 #ifndef vtkInformationInformationVectorKey_h 
   24 #define vtkInformationInformationVectorKey_h 
   26 #include "vtkCommonCoreModule.h"  
  
a simple class to control print indentation
Detect and break reference loops.