How can I implement the Visitor pattern in C++ and Java?

Can you explain the Visitor pattern and how to implement it in C++?

The Visitor pattern is a design pattern that allows you to separate an algorithm from the object structure on which it operates. In C++, you can implement it by defining a visitor interface and concrete visitor classes that implement this interface.

What about in Java? Is the implementation similar?

Yes, the implementation in Java is quite similar. You define a visitor interface and then create concrete visitor classes. The main difference is in the syntax and some language-specific features.

Can you provide a simple code example for both languages?

Sure! In C++, you might have a Shape interface and a ShapeVisitor interface. In Java, you would do something similar with interfaces and classes.

What are the advantages of using the Visitor pattern?

The Visitor pattern allows you to add new operations to existing object structures without modifying them, promoting open/closed principle.