The Art of Assembly Language, 2nd Edition

12.4 Inheritance

Inheritance is one of the most fundamental ideas behind object-oriented programming. The basic idea is that a class inherits, or copies, all the fields from some class and then possibly expands the number of fields in the new data type. For example, suppose you created a data type point that describes a point in the planar (two-dimensional) space. The class for this point might look like the following:

type
     point: class

          var
               x:int32;
               y:int32;

          method distance;

     endclass;

Suppose you want to create a point in 3D space rather than 2D space. You can easily build such a data type as follows:

type
     point3D: class inherits( point )

          var
               z:int32;

     endclass;

The inherits option on the class declaration tells HLA to insert the fields of point at ...