Download Advances in Computers, Vol. 33 by Marshall C. Yovits PDF

By Marshall C. Yovits

This quantity in a sequence detailing techniques in undefined, software program and the theory/design/applications of desktops, is worried with reusable software program parts, object-oriented modelling, discrete occasion simulation, and neurocomputing formalisms in computer studying and visualization.

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But designs based on redundant checking bring what Meyer (1988) calls “conceptual pollution” to the overall system. A convention about who is responsible for checking requires clauses should be adopted. Like Meyer we suggest that basic reusable components’ operations should not catch violations of their requires clauses. However, it should always be possible for a client to use the exported operations to check any requires clause and, if desired, to build a defensive version of a concept as a layer on top of the more basic nondefensive one.

Intuitively, the designer’s objective is to choose a “basis” for all computations with the type-a set of operations that “span” the set of computations that a client might wish to perform, yet are “orthogonal” in the sense that none is implementable using a combination of the others. An important question that arises here is how to characterize the set of computations that a client may wish to perform. One property of a truly reusable component is that not all possible uses of it are known to the designer.

The performance of a concrete component that is constructed in this way may or may not be acceptable. We do not further consider this method of implementation because one of the basic features of a reusablesoftware-components industry will surely be a potential client’s freedom to choose among various concrete components that realize the same abstract component. Some of these choices might be automatically generated from specifications and prove useful as “rapid prototypes,” but at least for the foreseeable future their performance will easily be dominated by cleverly devised programs written by humans.

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