The distributive package
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.*), base-orphans (>=0.5 && <1), ghc-prim, tagged (>=0.7 && <1), transformers (>=0.2 && <0.6), transformers-compat (>=0.3 && <1) [details] |
| License | BSD3 |
| Copyright | Copyright (C) 2011-2016 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 | Sun Jan 17 00:07:51 UTC 2016 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 | 122197 total (51 in the last 30 days) |
| Votes | |
| Status | Docs uploaded by user Build status unknown [no reports yet] |
Flags
| Name | Description | Default | Type |
|---|---|---|---|
| tagged | You can disable the use of the `tagged` package using `-f-tagged`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users. | Enabled | Manual |
Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info
Downloads
- distributive-0.5.0.2.tar.gz [browse] (Cabal source package)
- Package description (included in the package)
Readme for distributive
Readme for distributive-0.5.0.2
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