By Alexander Shvets
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Additional resources for Design Patterns Explained Simply
Make_HSB_color(float hue, float saturation, float brightness) 52 | Factory Method The client is totally decoupled from the implementation details of derived classes. Polymorphic creation is now possible. Example The Factory Method defines an interface for creating objects, but lets subclasses decide which classes to instantiate. Injection molding presses demonstrate this pattern. Manufacturers of plastic toys process plastic molding powder, and inject the plastic into molds of the desired shapes.
When given a base class pointer, if I absolutely need to know whether or not it is a Composite, I will use dynamic_cast to figure this out. In those cases where dynamic_cast is too expensive, I will use a Visitor. e. " My answer is that when I have behaviors which apply to hierarchies like the one presented in the Composite pattern, I typically use Visitor, so enumeration isn't a problem - the Visitor knows in each case, exactly what kind of object it's dealing with. The Visitor doesn't need every object to provide an enumeration interface.
The interface presented to the client must remain constant as successive layers are specified. 42 | Decorator Also note that the core object's identity has now been "hidden" inside of a decorator object. Trying to access the core object directly is now a problem. doThis(). doThis(). Each of these classes always delegate to the Decorator base class, and that class always delegates to the contained "wrappee" object. Example The Decorator attaches additional responsibilities to an object dynamically.