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Is it generally acceptable to allow a Visitor to modify state of the Receiver, or should that be a Command pattern instead?
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Three Types of Design Patterns (Behavioral, Creational, Structural) Distinguish between Behavioral, Creational, and Structural Design Patterns.
The purpose of a Visitor pattern is to define a new operation without introducing the modifications to an existing object structure. Imagine that we have a composite object which consists of components.
The Visitor pattern suggests that you place the new behavior into a separate class called visitor, instead of trying to integrate it into existing classes.
Visitor design pattern is one of the behavioral design patterns. It is used when we have to perform an operation on a group of similar kind of Objects. With the help of visitor pattern, we can move the operational logic from the objects to another class.
The purpose of the visitor pattern is to allow new operations to be added to a class heirarchy without modification to that heirarchy. I've never seen anyone suggesting that only read-only operations are acceptable. The only limitation is that the added operations should only use the public interface of the class heirarchy.
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