Download e-book for iPad: Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel

By Markus Egger, Mac Rubel

ISBN-10: 0965509389

ISBN-13: 9780965509381

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

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Extra info for Advanced Object Oriented Programming with Visual FoxPro 6.0

Example text

No matter from which object you talk to this property, you would always talk to the same property. This could be used to count instances, or to save memory by allocating memory for properties that don't change. This is a great feature for a low-level language like C++ that does a lot of things in a hybrid fashion, rather than in a truly object-oriented way. However, it breaks all the rules of encapsulation. Sometimes it seems that Visual FoxPro's object model is cleaner than the C++ model. Operator overloading Overloading operators means that a standard operator like "+" behaves differently than it was initially intended.

Cleaning up after yourself Whenever you create new object references or copy existing ones, you take the risk of creating object references that might keep objects alive after they are supposed to be released. For this reason, you need to be very careful and clean up after yourself, meaning you have to release all the references you created. NULL. NULL. " Well, good point. It seems like this would never be a problem, but it is in real-world scenarios. Sometimes object references can become cyclic over many steps.

Figure 2. The Properties window. Hmmm the Properties window says it doesn't have a parent class. That's strange. After all, I told you we couldn't create a class that didn't have a parent class. So what is the actual class? 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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