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You re probably used to using pointers or references to base classes in classic C++ to write polymorphic functions. You can do this with handles to interfaces, too. Frequently, you write code that uses interface handles if you want that code to be usable on a wide variety of possibly unrelated objects (for example, a method that takes an interface handle as a parameter). As long as all those object types implement the interface, you can use the function and never need to know the actual underlying object type. And because each class that implements an interface defines its own implementation of the interface methods, the behavior of different classes implementing the same interface can be quite diverse.

We pass the first remaining argument from the command line to the Begin() method, or, if there was no argument, the empty list.4 We need to perform this check to avoid warnings from Perl about uninitialized variables being used. Then we set up a loop to create the number of frames that are to be rendered. The output of the rendering program should go to the file names specified by the Display() method. Instead of RI_FILE we could have used RI_FRAMEBUFFER to indicate that the output should be sent to a screen. The size of the output file is set to 512 by 384 pixels, with a pixel aspect ratio of 1; and the background color of the image is set to white with the Imager() call. We then set up Phong shading by specifying a shading rate of at least once per pixel. We proceed by setting up our viewpoint and perspective by rotating and translating the global coordinates around, after which we can start with the definition of the world in which we will be working. The first items to be defined in our world are the lights and the default material. After that is completed, we set up some variables and call render_objects(), which is a subroutine that is responsible for drawing the spheres and cubes on the grid that was specified by the arguments.

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You don t ever really turn your BlackBerry off. Once it boots up, it can run for months without ever having to be fully-powered off.

sub render_objects { my ($n, $s, $r) = @_;

Abstract classes and interfaces are somewhat similar in functionality but have different uses in CLI programming. A class may implement many interfaces, but it can only be derived from one class. In a well-designed class library, the relationship between a derived class and an abstract base class is usually referred to as an is-a relationship. The interface relationship is slightly different a class that implements an interface has a relationship with the interface that might be described as as-a. Accessing an object of type R through a specific interface I is equivalent to treating the object of type R as an I. You could also say that implementing an interface is like fulfilling a contract. Interfaces generally encapsulate some aspect of the behavior of an object, not the identity of an object as an abstract base class does. A quick glance at the .NET Framework interface shows that many have the -ible or -able suffix: IEnumerable,

On some platforms the presented code does not work correctly, even though it should. You may have to replace this line with something like Begin(shift or output.rib ).

return unless $n > 0; AttributeBegin(); Transform the Translate(-0.5, -0.5, -0.5); coordinate system Scale(1/$n, 1/$n, 1/$n); for my $x (1 .. $n) { for my $y (1 .. $n) { for my $z (1 .. $n) { Set the color of the my @color = map { $_/$n } ($x, $y, $z); object Color(@color); TransformBegin(); Transform the Translate($x - 0.5, $y - 0.5, $z - 0.5); coordinate system Rotate($r, 0, 0, 1); Scale($s, $s, $s); cube(0.8) if $cubes; Draw the Sphere(0.5, -0.5, 0.5, 360) if $spheres; object TransformEnd(); } } } AttributeEnd();

IComparable, IDisposable. Often, but not always, interfaces relate to specific activities that an object is capable of participating in. In practical terms, abstract classes are easier to change in later versions of a library. If you ship a library with an interface and later release a new version of the library with an additional method, you force everyone who uses that interface to add the method to their classes. With an abstract class, you have a choice to provide a virtual implementation of the method, so as long as that implementation is acceptable for any derived classes, users of the abstract class don t need to make any changes. With interfaces, there is no choice: any classes implementing the modified interface will have to add the implementation. Depending on the situation, this might or might not be desirable.

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