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Global variables in Haskell

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Pubblicato in:Journal of Functional Programming vol. 14, no. 5 (Sep 2004), p. 489-502
Autore principale: HUGHES, JOHN
Pubblicazione:
Cambridge University Press
Soggetti:
Variables
Algorithms
Programming languages
Computer science
Servers (computers)
Imperative programming
Functional programming
Accesso online:Citation/Abstract
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Abstract:Haskell today provides good support not only for a functional programming style, but also for an imperative one. Elements of imperative programming are needed in applications such as web servers, or to provide efficient implementations of well-known algorithms, such as many graph algorithms. However, one element of imperative programming, the global variable, is surprisingly hard to emulate in Haskell. We discuss several existing methods, none of which is really satisfactory, and finally propose a new approach based on implicit parameters. This approach is simple, safe, and efficient, although it does reveal weaknesses in Haskell's present type system. [PUBLICATION ABSTRACT]
ISSN:0956-7968
1469-7653
Fonte:Advanced Technologies & Aerospace Database