Decorator

The book has now been published and the content of this chapter has likely changed substanstially.

An object that is placed between a client and another object for the purose of adding behavior.

Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.

A Decorator implements the same interface as the decorated object and adds behavior before or after it calls the same method (on the decorated object) as was called on itself.

From [GOF].

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