Visitor Design Pattern
This article describes the Visitor design pattern. This is a behavioral design pattern, a category of design pattern used by software engineers, when writing computer programs.
Introduction
The Visitor pattern is a design pattern, used in software engineering to add new virtual functions to a class without needing to change the class itself. The class is passed into the visitor to be acted upon, effectively giving the actor extra functionality.
It is defined as a behavioral design pattern, because it enables extra functionality to be performed.
Benefits
Existing classes or closed classes can be re-used to perform new tasks, like save to a new file format.
Examples of the pattern
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See Also
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References section
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