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

By Marshall C. Yovits

This quantity in a sequence detailing suggestions in undefined, software program and the theory/design/applications of pcs, is anxious with reusable software program elements, object-oriented modelling, discrete occasion simulation, and neurocomputing formalisms in desktop studying and visualization.

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Extra resources for Advances in Computers, Vol. 33

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WEIDE et a/. The major advantages of model-based specification over algebraic specification result directly from the reuse of mathematical theories. For one thing, the model-based specifier does not need to know how to define mathematical theories-a nontrivial task at best. , soundness, consistency, relative completeness). Defining a new theory remains a difficult chore. An ill-advised definition can lead to serious trouble, especially when proving properties about programs. Figure 2 also illustrates this other side of the coin.

This attribute is easy to check, and methods for achieving totality are readily discovered if a design is deemed wanting in this respect. Another view of totality is as “defensive programming,” which is offered by Berard (1987) as a necessary property of reusable software. ” General rules supporting this approach are proposed by Soffech (1985) and by Gautier and Wallis (1990). Despite the preceding claims, it is far from clear that reusable components should be defensive. If the client of a piece of software is an end user who may make a mistake with it, then that software clearly should be defensive.

It should not contain a jumble of almost-independent ideas in an end-run attempt to satisfy the coupling criterion. Notice that the coupling rule is intended primarily to guide the design of the most basic reusable components. A typical basic component such as the StackkTemplate should export a type and its primary operations. Extensions 26 BRUCE W. WElDE et al. of such a component are possible, though. For example, an abstract component that enhances the functionality of the Stack-Template with an operation to reverse a Stack obviously should be explained in terms related to the behavior of Stacks.

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