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Safe zero-cost coercions for Haskell

Part of: JFP Research Articles

Published online by Cambridge University Press:  28 July 2016

JOACHIM BREITNER ,
RICHARD A. EISENBERG ,
SIMON PEYTON JONES  and
STEPHANIE WEIRICH
JOACHIM BREITNER
Affiliation:
Karlsruhe Institute of Technology, Karlsruhe, Germany (e-mail: breitner@kit.edu)
RICHARD A. EISENBERG
Affiliation:
University of Pennsylvania, Philadelphia, Pennsylvania, USA (e-mail: eir@cis.upenn.edu)
SIMON PEYTON JONES
Affiliation:
Microsoft Research, Cambridge, United Kingdom (e-mail: simonpj@microsoft.com)
STEPHANIE WEIRICH
Affiliation:
University of Pennsylvania, Philadelphia, Pennsylvania, USA (e-mail: sweirich@cis.upenn.edu)
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Abstract

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Generative type abstractions – present in Haskell, OCaml, and other languages – are useful concepts to help prevent programmer errors. They serve to create new types that are distinct at compile time but share a run-time representation with some base type. We present a new mechanism that allows for zero-cost conversions between generative type abstractions and their representations, even when such types are deeply nested. We prove type safety in the presence of these conversions and have implemented our work in GHC.

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Information
Journal of Functional Programming , Volume 26 , 2016 , e15
Copyright
Copyright © Cambridge University Press 2016 

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