representable-functors: Representable functors

[ bsd3, data-structures, deprecated, functors, library, monads ] [ Propose Tags ]
Deprecated. in favor of adjunctions

Representable functors

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Versions [faq] 0.1.0,,, 0.2.0, 0.3.0,,,, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.5.0, 1.8.0, 2.0,,,,, 2.0.1, 2.0.2, 2.1, 2.1.2, 2.2, 2.2.1,, 2.4,,, 2.5, 3.0,,,, 3.0.1, 3.1,,
Change log CHANGELOG.markdown
Dependencies array (>= && <0.5), base (==4.*), comonad (==3.*), comonad-transformers (>=3), comonads-fd (>=3), containers (>=0.3 && <0.6), contravariant (>=, distributive (>=0.2.2), free (>=3), keys (>=3), mtl (>= && <2.2), semigroupoids (>=3), semigroups (>=, transformers (>=0.2 && <0.4) [details]
License BSD-3-Clause
Copyright Copyright (C) 2011-2013 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <>
Revised Revision 1 made by HerbertValerioRiedel at 2015-01-08T08:47:46Z
Category Monads, Functors, Data Structures
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Source repo head: git clone git://
Uploaded by EdwardKmett at 2013-03-26T07:45:44Z
Distributions Debian:, NixOS:
Downloads 27786 total (6 in the last 30 days)
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Readme for representable-functors-3.1

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This package provides representable functors for haskell. In category theory a representable functor (more pedantically a corepresentable functor) is one such that f a is isomorphic to x -> a. We choose the name Representable here because we are talking about haskell Functor instances, and they are all covariant, so this is the more natural notion of representability for Haskell.

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on

-Edward Kmett