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Visitor pattern and dynamic dispatch

The Design Patterns book by the infamous Gang of Four contains 23 object oriented design patterns. Some of them are kind of obvious (Adapter), or have become common knowledge since the book was published in 1994 (Iterator). My personal favourite is Visitor. Visitor "represents an operation to be performed on the elements of an object structure. Visitor lets you define a new operation without changing the classes of the elements on which it operations" [except you need to add an... full post»