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Parametrized Exceptions

Dennis Walter; Lutz Schröder; Till Mossakowski
In: Jose Fiadeiro; Jan Rutten (Hrsg.). Algebra and Coalgebra in Computer Science. Conference on Algebra and Coalgebra in Computer Science (CALCO-2005), September 3-6, Swansea, United Kingdom, Pages 424-438, Lecture Notes in Computer Science, Vol. 3629, ISBN 3-540-28620-9, Springer;, Berlin, 2005.


Following the paradigm of encapsulation of side effects via monads, the Java execution mechanism has been described by the so-called Java monad, encorporating essentially stateful computation and exceptions, which are heavily used in Java control flow. A technical problem that appears in this model is the fact that the return exception in Java is parametrized by the return value, so that method calls actually move between slightly different monads, depending on the type of the return value. We provide a treatment of this problem in the general framework of exception monads as introduced in earlier work by some of the authors; this framework includes generic partial and total Hoare calculi for abrupt termination. Moreover, we illustrate this framework by means of a verification of a pattern match algorithm.

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