Lambda the Ultimate

In
this paper, we present a typeful approach to implementing objects that makes use of a recently introduced notion of guarded datatypes. In particular, we demonstrate how the feature of multiple inheritance can be supported with this approach, presenting a simple and general account for multiple inheritance in a typeful manner.

[snip]

We refer the reader to [XCC03,Xi02] for further details on this typeful approach to OOP (with single inheritance). The treatment of multiple inheritance in this paper bears a great deal of similarity to the treatment of single inheritance in [XCC03,Xi02], though there are also some substantial differences involved. In order to handle multiple inheritance, we are to treat a path from a (super) class to a (sub)class as a first-class value.