Mutation, Aliasing, Viewpoints, Modular Reasoning, and Weak Behavioral Subtyping
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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.
History
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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- College of Liberal Arts and Sciences (parent college)
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Abstract
Existing work on behavioral subtyping either ignores aliasing or restricts the behavior of additional methods in a subtype and only allows one to use invariants and history constraints in reasoning. This prevents many useful subtype relationships; for example, a type with immutable objects (e.g., immutable sequences), cannot have a behavioral subtype with mutable objects (e.g., mutable arrays). Furthermore, the associated reasoning principle is not very useful, since one cannot use the pre- and postconditions of methods. Weak behavioral subtyping permits more behavioral subtype relationships, does not restrict the behavior of additional methods in subtypes, and allows the use of pre- and postconditions in reasoning. The only cost is the need to restrict aliases so that objects cannot be manipulated through the view of more than one type.