68. Visitor Benefits

• Visitor does not have Iterator-specific restrictions.

• Visitor can visit objects that don't have a common parent class.

• Any type of object can be added to Visitor's interface:

  
      class Visitor {
      public:
          void visit( TypeOne* );
          void visit( TypeTwo* );
      };
  
  

  where TypeOne and TypeTwo do not have to be related through inheritance at all.

• Visitors make adding new operations easy: add another visitor and define its visit() operation accordingly.