either: Combinators for working with sums

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

Combinators for working with sums.


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Versions [faq] 0.1, 0.2.1, 0.2.2, 0.2.2.1, 0.2.2.2, 0.2.2.3, 0.2.3, 0.2.3.1, 0.3, 0.3.0.1, 3.0, 3.0.1, 3.0.2, 3.0.3, 3.1, 3.2, 3.3, 3.4, 3.4.1, 3.4.2, 4.0, 4.1, 4.1.1, 4.1.2, 4.3, 4.3.0.1, 4.3.0.2, 4.3.1, 4.3.2, 4.3.2.1, 4.3.3, 4.3.3.1, 4.3.3.2, 4.3.4, 4.3.4.1, 4.4, 4.4.1, 4.4.1.1, 4.5, 5, 5.0.1, 5.0.1.1
Change log CHANGELOG.markdown
Dependencies base (==4.*), bifunctors (>=4 && <6), mtl (>=2.0 && <2.3), profunctors (>=4 && <6), semigroupoids (>=4 && <6), semigroups (>=0.8.3.1 && <1) [details]
License BSD-3-Clause
Copyright Copyright (C) 2008-2017 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <ekmett@gmail.com>
Category Control, Monads
Home page http://github.com/ekmett/either/
Bug tracker http://github.com/ekmett/either/issues
Source repo head: git clone git://github.com/ekmett/either.git
Uploaded by EdwardKmett at Tue Nov 21 03:04:47 UTC 2017
Distributions Arch:5.0.1.1, Debian:5.0.1, FreeBSD:4.4.1, LTSHaskell:5.0.1.1, NixOS:5.0.1.1, Stackage:5.0.1.1, openSUSE:5.0.1.1
Downloads 95273 total (856 in the last 30 days)
Rating 2.0 (votes: 1) [estimated by rule of succession]
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either

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This provides an Either monad transformer that unlike ErrorT is unencumbered by a constraint on its Left hand argument. This is needed for a number of applications of this monad transformer, notably in recursion-schemes.

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