PolyTOIL: A Type-Safe Polymorphic Object-Oriented Language

  • Authors:
  • Kim B. Bruce;Angela Schuett;Robert van Gent

  • Affiliations:
  • -;-;-

  • Venue:
  • ECOOP '95 Proceedings of the 9th European Conference on Object-Oriented Programming
  • Year:
  • 1995

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Abstract

PolyTOIL is a new statically-typed polymorphic object-oriented programming language which is provably type-safe. By separating the definitions of subtyping and inheritance, providing a name for the type of self, and carefully defining the type-checking rules, we have obtained a language which is very expressive while supporting modular type-checking of classes. The matching relation on types, which is related to F-bounded quantification, is used both in stating type-checking rules and expressing the bounds on type parameters for polymorphism. The design of PolyTOIL is based on a careful formal definition of type-checking rules and semantics. A proof of type safety is obtained with the aid of a subject reduction theorem.