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Semantics of value recursion for Monadic Input/Output

Published online by Cambridge University Press:  15 December 2002

Levent Erkök ,
John Launchbury  and
Andrew Moran
Levent Erkök
Affiliation:
OGI School of Science and Engineering, OHSU; erkok@cse.ogi.edu.
John Launchbury
Affiliation:
OGI School of Science and Engineering, OHSU; erkok@cse.ogi.edu. Galois Connections, Inc.
Andrew Moran
Affiliation:
Galois Connections, Inc.
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Abstract

Monads have been employed in programming languages for modeling various language features, most importantly those that involve side effects. In particular, Haskell's IO monad provides access to I/O operations and mutable variables, without compromising referential transparency. Cyclic definitions that involve monadic computations give rise to the concept of value-recursion, where the fixed-point computation takes place only over the values, without repeating or losing effects. In this paper, we describe a semantics for a lazy language based on Haskell, supporting monadic I/O, mutable variables, usual recursive definitions, and value recursion. Our semantics is composed of two layers: a natural semantics for the functional layer, and a labeled transition semantics for the IO layer.

Keywords

Type
Research Article
Information
RAIRO - Theoretical Informatics and Applications , Volume 36 , Issue 2: Fixed Points in Computer Science (FICS'01) , April 2002 , pp. 155 - 180
Copyright
© EDP Sciences, 2002

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