Cycling through alternate types

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soja

In terms of types, NULL means "doesn't exist" (really, the pointer is pointing to memory address 0)

Example: If I create three instances of a type, I'll end up with something like this:

NULL  <- Before First MyType
  |
Instance1.MyType  <- First MyType
  |
Instance2.MyType
  |
Instance3.MyType  <- Last MyType
  |
NULL  <- After Last MyType

So, you can check to see if you've iterated off the end of the list by checking for NULL.