Class-Based and Algebraic Models of Objects

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1998-04-01
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Leavens, Gary
Pigozzi, Don
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Computer Science

Computer Science—the theory, representation, processing, communication and use of information—is fundamentally transforming every aspect of human endeavor. The Department of Computer Science at Iowa State University advances computational and information sciences through; 1. educational and research programs within and beyond the university; 2. active engagement to help define national and international research, and 3. educational agendas, and sustained commitment to graduating leaders for academia, industry and government.

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The Computer Science Department was officially established in 1969, with Robert Stewart serving as the founding Department Chair. Faculty were composed of joint appointments with Mathematics, Statistics, and Electrical Engineering. In 1969, the building which now houses the Computer Science department, then simply called the Computer Science building, was completed. Later it was named Atanasoff Hall. Throughout the 1980s to present, the department expanded and developed its teaching and research agendas to cover many areas of computing.

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1969-present

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We compare different kinds of first-order models of objects and message passing, as found in object-oriented programming languages. We show that generic function models can easily simulate record models for static, class-based languages. We explore type systems for such languages, and show that our simulation preserves typing. Algebraic models emerge as abstractions of the generic function model that suppress details that are irrelevant for client code.

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© Gary T. Leavens and Don Pigozzi, 1997.

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