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The Visitor [1] design pattern is one of the twenty-three well-known Gang of Four design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse.
The single-serving visitor pattern should be used when visitors do not need to remain in memory. This is often the case when visiting a hierarchy of objects (such as when the visitor pattern is used together with the composite pattern) to perform a single task on it, for example counting the number of cameras in a 3D scene.
Using a visitor is a complementary approach to doing something with a collection of objects. In particular, a core idea of the visitor pattern is that you can prescribe different operations for different polymorphic (or static) types you visit. Also, with the visitor pattern, different objects have control over traversal order.
A (software) design pattern is a general solution to a common problem in software design. It is a description or template for how to solve a problem, that can be used in different situations. A design pattern typically shows relationship and interaction between classes or objects, without specifying final application classes or objects that are ...
The above example can be realized using the visitor pattern. It would require each animal class to implement an accept method accepting an object implementing the interface AnimalVisitor (adding non-local boilerplate code). The function animalToFood would be realized as the visit method of an implementation of AnimalVisitor.
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The Portland Pattern Repository (PPR) is an online repository for computer programming software design patterns. It was accompanied by the website WikiWikiWeb , the world's first wiki . The repository has an emphasis on extreme programming , and is hosted by Cunningham & Cunningham (C2) of Portland, Oregon . [ 1 ]
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