Polytypic Programming in Haskell
Paper in proceedings, 2004

A polytypic (or generic) program captures a common pattern of computation over different datatypes by abstracting over the structure of the datatype. Examples of algorithms that can be defined polytypically are equality tests, mapping functions and pretty printers. A commonly used technique to implement polytypic programming is specialization, where a specialized version of a polytypic function is generated for every datatype it is used at. In this paper we describe an alternative technique that allows polytypic functions to be defined using Haskell's class system (extended with multi-parameter type classes and functional dependencies). This technique brings the power of polytypic programming inside Haskell allowing us to define a Haskell library of polytypic functions. It also increases our flexibility, reducing the dependency on a polytypic language compiler. Valid HTML 4.01!

Author

Ulf Norell

Chalmers, Department of Computing Science, Functional Programming

Patrik Jansson

Chalmers, Department of Computing Science, Functional Programming

Chalmers, Department of Computing Science, Programming Logic

Implementation of Functional Languages

Vol. LNCS 3145 168-184

Subject Categories

Computer Science

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Created

10/8/2017