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Extending existing UDT
Once designing a new type, you don't have to start from a scratch.
Imagine our Point2D type, defined in the previous chapters.
It has two members, x and y.
TYPE Point2D
x AS SINGLE
y AS SINGLE
END TYPE
Once you will need to create 3D point, the obvious approach would be to do it this way:
TYPE Point3D
x AS SINGLE
y AS SINGLE
z AS SINGLE
END TYPE
The advantage of this copy-paste approach is that it is straightforward, but once you would add something to Point2D, it would need to be promoted to Point3D manually.
Let's have a look at two different approaches to create new type based on existing one.
