The distributive package
Haskell 98 Distributive functors -- Dual to Traversable
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Properties
| Versions | 0.1, 0.1.1, 0.1.2, 0.2.0, 0.2.0.1, 0.2.1, 0.2.2, 0.3, 0.3.1, 0.3.2, 0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.3.1, 0.4.3.2, 0.4.4, 0.5, 0.5.0.1, 0.5.0.2 |
|---|---|
| Change log | CHANGELOG.markdown |
| Dependencies | base (==4.*), tagged (>=0.7 && <1), transformers (>=0.2 && <0.4), transformers-compat (==0.1.*) [details] |
| License | BSD3 |
| Copyright | Copyright (C) 2011-2014 Edward A. Kmett |
| Author | Edward A. Kmett |
| Maintainer | Edward A. Kmett <ekmett@gmail.com> |
| Stability | provisional |
| Category | Data Structures |
| Home page | http://github.com/ekmett/distributive/ |
| Bug tracker | http://github.com/ekmett/distributive/issues |
| Source repository | head: git clone git://github.com/ekmett/distributive.git |
| Uploaded | Mon Mar 24 17:47:54 UTC 2014 by EdwardKmett |
| Distributions | Arch:0.5.0.2, Debian:0.4.4, Fedora:0.4.4, FreeBSD:0.4.4, LTSHaskell:0.5.0.2, NixOS:0.5.0.2, Stackage:0.5.0.2, Tumbleweed:0.5.0.2 |
| Downloads | 122191 total (54 in the last 30 days) |
| Votes | |
| Status | Docs available [build log] Successful builds reported [all 1 reports] |
Flags
| Name | Description | Default | Type |
|---|---|---|---|
| lib-werror | Disabled | Manual |
Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info
Downloads
- distributive-0.4.1.tar.gz [browse] (Cabal source package)
- Package description (included in the package)
Readme for distributive
Readme for distributive-0.4.1
distributive
This package provides the notion that is categorically dual to Traversable.
A Distributive Functor is one that you can push any functor inside of.
distribute :: (Functor f, Distributive g) => f (g a) -> g (f a)
Compare this with the corresponding Traversable notion, sequenceA.
sequenceA :: (Applicative f, Traversable g) => g (f a) -> f (g a)
This package includes instances for common types, and includes other methods similar to traverse which fuse the use of fmap.
We only require Functor rather than some dual notion to Applicative, because the latter cannot meaningfully exist in Haskell
since all comonoids there are trivial.
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