Download Abstraction and specification in program development by Barbara Liskov, John V. Guttag PDF

By Barbara Liskov, John V. Guttag

Abstraction and Specification in software improvement bargains pros in software layout and software program engineering a strategy that might allow them to build courses which are trustworthy and fairly effortless to appreciate, regulate, and keep. reliable programming consists of the systematic mastery of complexity, and this e-book offers the 1st unified therapy of the options of abstraction and specification, which, the authors argue, are the linchpin of any potent method of programming. They position specific emphasis at the use of knowledge abstraction to supply hugely modular courses. The authors specialize in the method of decomposing huge application initiatives into self sustaining modules that may be assigned to self sufficient operating teams. They talk about tools of decomposition, the types of modules which are most valuable during this procedure, and strategies to extend the possibility that modules produced can actually be recombined to resolve the unique programming challenge. there are numerous examples of abstractions through the textual content, and every bankruptcy ends with pertinent references and routines. lots of the pattern implementations within the e-book are written in CLU, one among increasingly more languages in a position to help facts abstraction. enough fabric is incorporated, even though, to permit the reader to paintings in Pascal in addition. the fabric during this publication was once constructed via the authors in the course of a decade of training undergraduate, graduate, and professional-level classes. Barbara Liskov, the developer of CLU, is Professor and John Guttag an affiliate Professor of machine technology at MIT. Abstraction and Specification in application improvement is integrated within the MIT electric Engineering and laptop technology sequence.

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Consequently, such a structure containing only one reference per storage chunk currently in use is called a sparse structure. , 4 byte for an integer attribute) , a sparse structure will be considerably smaller than a dense one, since each reference will at least consume 4 additional bytes. 3 CHAPTER 3 Informal outline of the basic approaches So far, an index and its incorporated data structures have been viewed as a black box which is able to store and retrieve records. At this point, we will take a first (again absolutely informal) look inside this black box.

L-=::t--t-~ii:~~~:::; ,. i l. . . . . . . . . ~1.................... 20 Combined data structures, income placing sparse (one address entry per chunk), whereas the latter is dense (one address entry per record). Although any of the two data structures could be based on subspace mapping or point mapping, the choice in the above example is quite reasonable. Range query specifications for attribute income are likely, thus a subspace mapping structure has been chosen. On the contrary, range query 50 CHAPTER 3 specifications for attribute ssnr are rather meaningless (considering ssnr some kind of running number without particular semantics), consequently a point mapping structure seems appropriate.

L-=::t--t-~ii:~~~:::; ,. i l. . . . . . . . . ~1.................... 20 Combined data structures, income placing sparse (one address entry per chunk), whereas the latter is dense (one address entry per record). Although any of the two data structures could be based on subspace mapping or point mapping, the choice in the above example is quite reasonable. Range query specifications for attribute income are likely, thus a subspace mapping structure has been chosen.

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