The free-functors package

[Tags: bsd3, library]

A free functor is a left adjoint to a forgetful functor. It used to be the case that the only category that was easy to work with in Haskell was Hask itself, so there were no interesting forgetful functors.

But the new ConstraintKinds feature of GHC provides an easy way of creating subclasses of Hask. That brings interesting opportunities for free (and cofree) functors.

The examples directory contains an implementation of non-empty lists as free semigroups, and automata as free actions. The standard example of free higher order functors is free monads, and this definition can be found in Data.Functor.HFree.


Properties

Versions0, 0.1, 0.1.1, 0.1.2, 0.2, 0.3, 0.4, 0.4.1, 0.5, 0.6, 0.6.1, 0.6.1.1, 0.6.2, 0.6.3, 0.6.3.1, 0.6.3.2, 0.6.3.3
Dependenciesbase (>=4.4 && <5), comonad (==3.0.*), constraints (>=0.3.2 && <0.4), transformers (>=0.2.0.0 && <0.4)
LicenseBSD3
AuthorSjoerd Visscher
Maintainersjoerd@w3future.com
Stabilityexperimental
CategoryData, Math
Home pagehttp://github.com/sjoerdvisscher/free-functors
Bug trackerhttp://github.com/sjoerdvisscher/free-functors/issues
Source repositoryhead: git clone git://github.com/sjoerdvisscher/free-functors.git
UploadedMon Jul 23 22:46:55 UTC 2012 by SjoerdVisscher
Downloads1329 total (84 in last 30 days)
StatusDocs uploaded by user
Build status unknown [no reports yet]

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