Proceedings Technology of Object-Oriented Languages and Systems. TOOLS 32 (1999)
Nov. 22, 1999 to Nov. 25, 1999
Axel Schmolitzky , Monash University
Mark Evered , University of New England
J. Leslie Keedy , University of Ulm
Gisela Menger , University of Ulm
Binary class methods are often more suitable for modeling binary operations than binary instance methods. Allowing covariant parameter type adaptations in class methods can make them even more attractive. In this paper we discuss the implications of covariant class methods on type safety. We discuss two examples, one type-safe at run-time and the other not, and formulate type rules that make it possible to identify the difference at compile-time.
language design, binary methods, pragmatical class methods, covariance, static type safety
M. Evered, G. Menger, J. L. Keedy and A. Schmolitzky, "How Can Covariance in Pragmatical Class Methods be Made Statically Type-Safe?," Proceedings Technology of Object-Oriented Languages and Systems. TOOLS 31(TOOLS), Nanjing, China, 1999, pp. 200.