Composition patterns: an approach to designing reusable aspects
ICSE '01 Proceedings of the 23rd International Conference on Software Engineering
Extending standard UML with model composition semantics
Science of Computer Programming - Special issue on unified modeling language (UML 2000)
Architectural views of aspects
Proceedings of the 2nd international conference on Aspect-oriented software development
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Multiple class hierarchies can be used each to represent a separate requirement or design concern. To yield a working system, these disparate hierarchies must be composed in a semantically meaningful way. However, cycles can arise in the composed inheritance graph that restrict the space of composable hierarchies. This work presents an approach to eliminating these cycles by means of separating the type hierarchy from the implementation hierarchy; separate solutions are provided for languages permitting multiple inheritance, such as C++, and those permitting only interfaces, such as Java. The resulting acyclic class hierarchy will maintain the significant constraints imposed by the original, separate hierarchies, such as type-safety.