Visitor Design Pattern

Visitor Design Pattern

Intent:

Visitor lets you define a new operation without changing the classes of the elements on which it operates.

Source: Design Patterns: Elements of Reusable Object-Oriented Software

Participants:

• Visitor
• ConcreteVisitor
• Element
• ConcreteElement

Click to expand Python Code

Use Cases:

• Logger
• Session Settings

Issues:

References:

• Visitor pattern - Wiki
• Visitor - refactoring.guru
• The Visitor Design Pattern in Depth