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

Versions 0, 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, 0.6.4, 0.6.4.1, 0.6.5
Dependencies algebraic-classes (==0.1.*), base (>=4.4 && <5), comonad (==3.0.*), constraints (>=0.3.2 && <0.4), transformers (>=0.2.0.0 && <0.4), void (>=0.4 && <0.7) [details]
License BSD3
Author Sjoerd Visscher
Maintainer sjoerd@w3future.com
Stability experimental
Category Data, Math
Home page https://github.com/sjoerdvisscher/free-functors
Bug tracker https://github.com/sjoerdvisscher/free-functors/issues
Source repository head: git clone git://github.com/sjoerdvisscher/free-functors.git
Uploaded Tue Apr 16 22:38:29 UTC 2013 by SjoerdVisscher
Distributions NixOS:0.6.5
Downloads 3401 total (38 in the last 30 days)
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