Publication Date

12-1996

Technical Report Number

TR96-04b

Subjects

Computing Milleux, Software

Abstract

The interface specification of a procedure describes the procedure's behavior using pre- and postconditions. These pre- and postconditions are written using various functions. If some of these functions are partial, or underspecified, then the procedure specification may not be well-defined. We show how to write pre- and postcondition specifications that avoid such problems, by having the precondition ``protect'' the postcondition from the effects of partiality and underspecification. We formalize the notion of protection from partiality in the context of specification languages like VDM-SL and COLD-K. We also formalize the notion of protection from underspecification for the Larch family of specification languages, and for Larch show how one can prove that a procedure specification is protected from the effects of underspecification.

Comments

© Copyright 1996 by Gary T. Leavens and Jeannette M. Wing. All rights reserved.

Share

COinS