OCLOperators addReturnIndexOf0

The AddReturnIndexOf0 works like a normal Add - but returns the zero-based position of the object added.

This is particularly useful when dealing with innerlink objects - you add an object of Class2 to Class1.Class2s - and that results in a link object creation of Class3. You can access the object of Class3 with an expression like:

let x=self.Class2s.addReturnIndexOf0(Class2.Create) in

Or even more compact:

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