Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel

By Markus Egger, Mac Rubel

This ebook combines OOP concept and real-world useful knowledge, all from the visible FoxPro viewpoint. coated are multi-tiered structure; OO layout styles; item metrics; and OO specifications, modeling, and layout, together with the UML.

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These pointers know the memory address of the objects. If you pass this memory address to another function, it will still point to the same address and therefore to the same object. For this reason, there is no need to pass object pointers by reference, because the result will be almost the same (all right, you might save a byte or two of memory). Many people actually believe that FoxPro checks to see whether the passed parameter is an object, and if so, automatically passes it by reference. For the reasons described above, this is not the case and it isn't necessary.

This is not a good way to go. Whenever other objects require redesign in order to make other objects work, there is something wrong and you should think of a better way. 47 48 In this example, I could simply iterate through the collection before I add a new item, and clean up the collection. This wouldn't be a perfect solution, because it could still throw the collection out of sync from time to time, but for most uses it should do the trick. If this weren't good enough, I'd have to use an observer component which, on the other hand, might introduce a performance problem.

See Figure 3. 53 54 Figure 3. The current class of the Properties window. FoxPro says the current class is CommandButton. That's strange, too!

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Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel
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