Abstract

Based on a name-passing calculus and on its typing system the paper shows how to build several language constructors towards a strongly-typed objectoriented concurrent programming language. The basic calculus incorporates the notions of asynchronous labelled messages, concurrent objects composed of labelled methods, and a form of abstraction on processes allowing in particular to declare polymorphic classes. We introduce a notion of values as name-expressions, and show how to create subclasses of existing classes. A systematic translation of the derived constructors into the basic calculus provides for semantics and for typing rules for the new constructors. Introduction Concurrent objects constitute a convenient tool to describe concurrent and distributed computations. Types enforce a discipline in the usage of the programming language constructors that not only provides for partial-correctness, but also helps in writing clear programs. Furthermore, a type for a program often gives s...

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