either: Combinators for working with sums

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Combinators for working with sums.


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Versions 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, 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 2017-11-21T03:04:21Z

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either

Hackage Build Status

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