By Marshall C. Yovits
This quantity in a chain detailing recommendations in undefined, software program and the theory/design/applications of desktops, is worried 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
An apparently reusable abstract component may be designed poorly from the standpoint of reuse. There are many ways in which a design may be inadequate but still tolerable, but there is one problem that history has shown is sure to frustrate reuse: inefficiency (Soffech, 1985). ” A poorly designed abstract component may even inherently rule out efficient realizations. Is it even possible to have reusable components that are both flexible and efficient? Reusable software has a reputation for being inefficient-one of the problems that tempts a source-code owner to modify it.
A component designed according to this guideline is not responsible for catching or for handling errors that might occur while it is executing, and therefore should not (among other things) raise any exception conditions resulting from violations of its requires clauses. , Ada and Eiffel but not C++ and RESOLVE) often are designed defensively. It seems tempting to use exception-handling when it is available. ” Similar suggestions are offered by Gautier and Wallis (1990). Notice that if one follows the second suggestion in the design of a basic reusable component, then it is easy to build a component that follows the first suggestion without loss of efficiency-by layering on top of the original component-but not vice versa.
1985; Guttag and Horning, 1986a) and a program-interface REUSABLE SOFTWARE COMPONENTS 19 specification is written in an implementation-language-specific Larch Interface Language (Wing, 1987). Larch can be used to write specifications in either the algebraic or the model-based style, but the main catalog of published examples (Guttag and Homing, 1986b) clearly favors the algebraic style. That is, a program concept typically is explained by a mathematical model that is devised especially to explain it.