Download A theory of Objects by Martín Abadi, Luca Cardelli PDF

By Martín Abadi, Luca Cardelli

Procedural languages are mostly good understood and their formal foundations solid within the different types of quite a few lambda-calculi. For object-oriented languages but the state of affairs isn't as uncomplicated. during this publication the authors suggest and advance a unique process via constructing item calculi during which items are handled as primitives. utilizing item calculi, the authors may be able to clarify either the semantics of gadgets and their typing principles and show tips on how to improve all the most crucial suggestions of object-oriented programming languages: self, dynamic dispatch, periods, inheritance, safe and personal equipment, prototyping, subtyping, covariance and contravariance, and approach specialization. Many researchers and graduate scholars will locate this an enormous improvement of the underpinnings of object-oriented programming.

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Objectbased languages, in contrast, have emerged more gradually. Their main principles were first gathered in the Treaty of Orlando (114); to a large extent, even their most basic notions are still evolving (118). Object-based languages are intended to be both simpler and more flexible than traditional class-based languages. Many object-based languages originated in the Lisp, Smalltalk, and artificial intelligence communities, where extreme flexibility is highly valued [11,31,32,78,80]. As a consequence, little attention has been devoted to designing typed object-based languages, except for simple ones such as Emerald, and for recent ones such as Cecil and Omega.

In the case of functions of multiple arguments, for example of type (AIxA2)~B, we have contravariance in both Al and A2. This is because product, which is covariant in both of its arguments, is found in a contravariant context.

CLASS-BASED LANGUAGES 21 We examine function types next. The type A~B is the type of functions with argument type A and result type B. We say that ~ is a contravariant operator in its left argument because A~B varies in the opposite sense as A; the right argument is instead covariant: A~B <: A'~B' provided that A' <: A and B <: B' Argument for the co/contravariance of A~B If B <: B', then a functionf of type A~B produces results oftype B' by subsumption. If A' <: A, then f accepts also arguments of type A', since these have type A by subsumption.

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