Visitor Pattern - main players

• Client
• A class that creates and maintains the object structure; instantiates and calls the Visitors
• ObjectStructure
• A composite structure of several related element types
• Element
• The root element type for the object structure
• ElementA and ElementB
• Subclasses of Element
• IVisitor
• An interface for all the Visitor classes
• Visitor1 and Visitor2
• Classes that contain methods that iterate through the object structure and apply operations to its elements