free: Monads for free

[ bsd3, control, library, monads ] [ Propose Tags ]

Free monads are useful for many tree-like structures and domain specific languages.

A Monad n is a free Monad for f if every Monad homomorphism from n to another monad m is equivalent to a natural transformation from f to m.

Cofree comonads provide convenient ways to talk about branching streams and rose-trees, and can be used to annotate syntax trees.

A Comonad v is a cofree Comonad for f if every Comonad homomorphism another comonad w to v is equivalent to a natural transformation from w to f.


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Versions 0.1.0, 0.1.1, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 1.8.0, 1.8.0.1, 1.8.0.3, 1.8.0.4, 2.0, 2.0.1, 2.0.1.1, 2.0.2, 2.0.3, 2.1, 2.1.1, 2.1.1.1, 2.2, 3.0, 3.1, 3.1.1, 3.2, 3.3, 3.3.0.1, 3.3.0.2, 3.3.1, 3.4, 3.4.1, 3.4.2, 4.0, 4.1, 4.2, 4.4, 4.5, 4.6, 4.6.1, 4.7, 4.7.1, 4.8, 4.8.0.1, 4.9, 4.10.0.1, 4.11, 4.12, 4.12.1, 4.12.2, 4.12.3, 4.12.4, 5, 5.0.1, 5.0.2
Change log CHANGELOG.markdown
Dependencies base (==4.*), bifunctors (==4.*), comonad (==4.*), distributive (>=0.2.1), mtl (>=2.0.1.0 && <2.2), profunctors (==4.*), semigroupoids (==4.*), semigroups (>=0.8.3.1 && <1), template-haskell (>=2.7.0.0 && <3), transformers (>=0.2.0 && <0.4) [details]
License BSD-3-Clause
Copyright Copyright (C) 2008-2013 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <ekmett@gmail.com>
Category Control, Monads
Home page http://github.com/ekmett/free/
Bug tracker http://github.com/ekmett/free/issues
Source repo head: git clone git://github.com/ekmett/free.git
Uploaded by EdwardKmett at Mon Mar 24 04:15:42 UTC 2014
Distributions Arch:5.0.2, Debian:4.12.1, Fedora:4.12.4, FreeBSD:4.12.1, LTSHaskell:5.0.2, NixOS:5.0.2, Stackage:5.0.2, openSUSE:5.0.2
Downloads 159529 total (574 in the last 30 days)
Rating 2.5 (votes: 3) [estimated by rule of succession]
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Status Docs available [build log]
Successful builds reported [all 1 reports]
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Readme for free-4.6.1

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free

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This package provides a common definitions for working with free monads, free applicatives, and cofree comonads in Haskell.

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on irc.freenode.net.

-Edward Kmett