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Backtracking with cut via a distributive law and left-zero monoids*

Published online by Cambridge University Press:  13 July 2017

MACIEJ PIRÓG  and
SAM STATON
MACIEJ PIRÓG
Affiliation:
University of Wrocław, Poland (e-mail: [email protected])
SAM STATON
Affiliation:
University of Oxford, UK
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Abstract

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We employ the framework of algebraic effects to augment the list monad with the pruning cut operator known from Prolog. We give two descriptions of the resulting monad: as the monad of free left-zero monoids, and as a composition via a distributive law of the list monad and the ‘unary idempotent operation’ monad. The scope delimiter of cut arises as a handler.

Type
Theoretical Pearls
Information
Journal of Functional Programming , Volume 27 , 2017 , e17
Copyright
Copyright © Cambridge University Press 2017 

Footnotes

*

Research supported by a Royal Society University Research Fellowship and EPSRC Grant EP/N007387/1

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