The transformers package

[Tags: bsd3, library]

A portable library of functor and monad transformers, inspired by the paper "Functional Programming with Overloading and Higher-Order Polymorphism", by Mark P Jones, in Advanced School of Functional Programming, 1995 (

This package contains:

The package can be used on its own in portable Haskell code, in which case operations need to be manually lifted through transformer stacks (see Control.Monad.Trans.Class for some examples). Alternatively, it can be used with the non-portable monad classes in the mtl or monads-tf packages, which automatically lift operations introduced by monad transformers through other transformers.


Versions0.0.0.0,,,,,,,,,,,,,,,,,,,, (info)
Change logchangelog
Dependenciesbase (>=2 && <6), ghc-prim [details]
AuthorAndy Gill, Ross Paterson
MaintainerRoss Paterson <>
Bug tracker
Source repositoryhead: darcs get
UploadedWed Feb 17 12:21:37 UTC 2016 by RossPaterson
DistributionsArch:, Debian:, Fedora:, LTSHaskell:, NixOS:, Stackage:
Downloads223289 total (46 in last 30 days)
2 []
StatusDocs available [build log]
Last success reported on 2016-04-12 [all 1 reports]




Maintainers' corner

For package maintainers and hackage trustees