Download e-book for iPad: Design Patterns: Elements of Reusable Object-Oriented by Erich Gamma, Richard Helm, Ralph Johnson, John M. Vlissides

By Erich Gamma, Richard Helm, Ralph Johnson, John M. Vlissides

4 top-notch authors current the 1st booklet containing a catalog of object-oriented layout styles. Readers will find out how to use layout styles within the object-oriented improvement procedure, find out how to resolve particular layout difficulties utilizing styles, and achieve a typical vocabulary for object-oriented layout.

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Additional resources for Design Patterns: Elements of Reusable Object-Oriented Software

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We defined the Rectangle::Draw in terms of the DrawRect operation on the Window instance: void Rectangle::Draw (Window* w) { w->DrawRect(_x0, _y0, _x1, _y1); } The default implementation of DrawRect uses the abstract operation for drawing rectangles declared by WindowImp: void Window::DrawRect ( Coord x0, Coord y0, Coord x1, Coord y1 ) { Pag 55 de 358 Gamma – Helm - Johnson – Vlissides } _imp->DeviceRect(x0, y0, x1, y1); where _imp is a member variable of Window that stores the WindowImp with which the Window is configured.

And subclassing can lead to an explosion of classes, because you might have to introduce many new subclasses for even a simple extension. Object composition in general and delegation in particular provide flexible alternatives to inheritance for combining behavior. New functionality can be added to an application by composing existing objects in new ways rather than by defining new subclasses of existing classes. On the other hand, heavy use of object composition can make designs harder to understand.

But suppose we already have several class hierarchies from different vendors, one for each look-and-feel standard. Of course, it's highly unlikely these hierarchies are compatible in any way. )—and the Abstract Factory pattern won't work without those crucial classes. We have to make the different widget hierarchies adhere to a common set of abstract product interfaces. Only then could we declare the Create... operations properly in our abstract factory's interface. We solved this problem for widgets by developing our own abstract and concrete product classes.

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