Abstract
An entity in the real world may obtain and lose its roles, or aspects, again and again with time. For modeling such dynamic changes of aspects, objects having multiple types, or multiple-type objects, are essential to persistent programming languages. In this paper, we introduce multiple-type objects, and show a method of implementing them in an enhanced C++ persistent programming language called INADA. Any persistent objects in INADA may obtain any type at any time the type is needed, and may lose any unnecessary types dynamically. We also present a performance study in which the performance penalty caused by the introduction of multiple-type objects was examined. Copyright © 2000 John Wiley & Sons, Ltd.
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