NDLI: A generic deriving mechanism for Haskell

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A generic deriving mechanism for Haskell

Content Provider	ACM Digital Library
Author	Jeuring, Johan Löh, Andres Magalhães, José Pedro Dijkstra, Atze
Abstract	Haskell's deriving mechanism supports the automatic generation of instances for a number of functions. The Haskell 98 Report only specifies how to generate instances for the Eq, Ord, Enum, Bounded, Show, and Read classes. The description of how to generate instances is largely informal. The generation of instances imposes restrictions on the shape of datatypes, depending on the particular class to derive. As a consequence, the portability of instances across different compilers is not guaranteed. We propose a new approach to Haskell's deriving mechanism, which allows users to specify how to derive arbitrary class instances using standard datatype-generic programming techniques. Generic functions, including the methods from six standard Haskell 98 derivable classes, can be specified entirely within Haskell 98 plus multi-parameter type classes, making them lightweight and portable. We can also express Functor, Typeable, and many other derivable classes with our technique. We implemented our deriving mechanism together with many new derivable classes in the Utrecht Haskell Compiler.
Starting Page	37
Ending Page	48
Page Count	12
File Format	PDF QT / MOV
ISBN	9781450302524
DOI	10.1145/1863523.1863529
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-09-30
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Datatype-generic programming Haskell Type classes
Content Type	Video Text
Resource Type	Article

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