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The call-by-need lambda calculus

Published online by Cambridge University Press:  01 May 1998

JOHN MARAIST ,
MARTIN ODERSKY  and
PHILIP WADLER
JOHN MARAIST
Affiliation:
School of Computer and Information Science, University of South Australia, Warrendi Road, The Levels, Adelaide, SA 5095, Australia; e-mail: [email protected]@cis.unisa.edu.au
MARTIN ODERSKY
Affiliation:
School of Computer and Information Science, University of South Australia, Warrendi Road, The Levels, Adelaide, SA 5095, Australia; e-mail: [email protected]@cis.unisa.edu.au
PHILIP WADLER
Affiliation:
Bell Laboratories, Lucent Technologies, 700 Mountain Ave., Room 2T-304, Murray Hill, NJ 07974-0636, USA; e-mail: [email protected]
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Abstract

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We present a calculus that captures the operational semantics of call-by-need. The call-by-need lambda calculus is confluent, has a notion of standard reduction, and entails the same observational equivalence relation as the call-by-name calculus. The system can be formulated with or without explicit let bindings, admits useful notions of marking and developments, and has a straightforward operational interpretation.

Type
Research Article
Information
Journal of Functional Programming , Volume 8 , Issue 3 , May 1998 , pp. 275 - 317
Copyright
© 1998 Cambridge University Press
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