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1 Dipartimento di Informatica Torino 2 Dipartimento di Matematica padova 3 LOGNET - Logical Networks: Self-organizing Overlay Networks and Programmable Overlay Computing Systems CRISAM - Inria Sophia Antipolis - Méditerranée 4 CSELT - Centro Studi e Laboratori Telecomunicazioni

Abstract : We extend the type system for the Lambda Calculus of Objects 14 to account for a notion of width subtyping. The main novelties over previous work are the use of bounded quantification to achieve a new and more direct rendering of MyType polymorphism, and a uniform treatment for other features that were accounted for via different systems in subsequent extensions 7, 6 of 14. In particular, the new system provides for i appropriate type specialization of inherited methods, ii static detection of errors, iii width subtyping compatible with object extension, and iv complete freedom in the order of method addition.

Autor: Viviana Bono - Michele Bugliesi - Mariangiola Dezani-Ciancaglini - Luigi Liquori -



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