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Inheritance◄╣

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► KB ► To/From Guides ► ObjectPAL ► Database

Inheritance (Cross Ref > Database)

By Mike Prestwood

ObjectPAL versus C++: A side by side comparison between ObjectPAL and C++.

OOP Basics

Some languages support object-based concepts such as Paradox, Access, and VB Classic. Other languages have OO extensions and fully support object orientation in a hybrid fashion (such as C++ and Dephi for Win32). Finally, some lanages such as C#, VB.Net, Prism, and Java are entirely written in OO. Meaning, every line of code written must occur within a class).

Inheritance

[Other Languages]

The concept of a class makes it possible to define subclasses that share some or all of the main class characteristics. This is called inheritance. Inheritance also allows you to reuse code more efficiently. In a class tree, inheritance is used to design classes vertically. (You can use Interfaces to design classes horizontally within a class tree.) With inheritance, you are defining an "is-a" relationship (i.e. a chow is-a dog). Analysts using UML call this generalization where you generalize specific classes into general parent classes.

ObjectPAL: Not Supported

ObjectPAL does not support class creation nor sub-classing (inheritance).

ObjectPAL Inheritance (Not Supported) 1 certification question.

C++: : public ParentClass

In C++ you use the class keyword to signify a class and a colon followed by the parent class name for inheritance.

Syntax Example:

In the following example, a terminator T-600 is-an android.

class Android {

};

class T-600: Public Android {

};

C++ Inheritance (: public ParentClass)