Design Patterns: Elements of Reusable Object-Oriented Software (Joanne Romanovich's Library) by Erich Gamma & Richard Helm & Ralph Johnson & John Vlissides

Author:Erich Gamma & Richard Helm & Ralph Johnson & John Vlissides
Language: eng
Format: epub
Publisher: Addison-Wesley
Published: 1995-03-02T16:00:00+00:00

Sample Code

The following code shows how to implement user interface decorators in C++. We’ll assume there’s a Component class called VisualComponent.

We define a subclass of VisualComponent called Decorator, which we’ll subclass to obtain different decorations.

Decorator decorates the VisualComponent referenced by the _component instance variable, which is initialized in the constructor. For each operation in VisualComponent’s interface, Decorator defines a default implementation that passes the request on to _component:

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