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Erschienen in:
2013 | OriginalPaper | Buchkapitel
State Based Encapsulation for Modular Reasoning about Behavior-Preserving Refactorings
verfasst von : Anindya Banerjee, David A. Naumann
Erschienen in: Aliasing in Object-Oriented Programming. Types, Analysis and Verification
Verlag: Springer Berlin Heidelberg
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A properly encapsulated data representation can be revised for refactoring or other purposes without affecting the correctness of client programs and extensions of a class. But encapsulation is difficult to achieve in object-oriented programs owing to heap based structures and reentrant callbacks. This chapter shows that it is achieved by a discipline using assertions and auxiliary fields to manage invariants and transferrable ownership. The main result is representation independence: a rule for modular proof of equivalence of class implementations.