Download e-book for iPad: Advances in Computers, Vol. 33 by Marshall C. Yovits

By Marshall C. Yovits

ISBN-10: 0080566650

ISBN-13: 9780080566658

ISBN-10: 0120121336

ISBN-13: 9780120121335

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

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Extra resources for Advances in Computers, Vol. 33

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But the way, the specification of Are-Equal introduces an operation that returns control. ” Control operations are invoked to compute conditions to be tested in if-statements and while-loops in client programs and, like function operations in RESOLVE that return results, are not permitted to modify their parameters. The generality criterion implies that copying and equality testing should not be treated as built-in operations. , one whose representation is hidden from the client. ” However, the shorthand versions operate on concrete representations, not abstract values, and therefore may not act as Replica and Are-Equal are specified to behave.

Redundant checking is inefficient, leading Liskov and Guttag (1986) to recommend in-line expansion of procedure calls and subsequent source-level optimization to overcome it. 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.

Generality means that a specification is sufficiently abstract and not too restrictive to permit a variety of acceptable and efficient implementations. In 24 BRUCE W. WEIDE et a / . the setting of a software-components industry in which multiple concrete components are expected for each abstract component, this is certainly a worthwhile design objective. Using what Liskov and Guttag (1986) call a “definitional” style of specification¶ as opposed to an “operational” one, is a major step toward generality.

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


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