Rational +package

package free-operational
package
A reimplementation of the operational package (http://hackage.haskell.org/package/operational) using free monads (from http://hackage.haskell.org/package/free). This implements ideas discussed here: * http://stackoverflow.com/questions/14263363/is-operational-really-isomorphic-to-a-free-monad * http://www.reddit.com/r/haskell/comments/17a33g/free_functors_the_reason_free_and_operational_are/ To understand the basic concepts you can do no better than read Heinrich Apfelmus' operational tutorial: * http://apfelmus.nfshost.com/articles/operational-monad.html In addition to that, this package supplies operational-style modules for Applicative, Alternative and MonadPlus. Applicative and Alternative programs easily admit of static analysis.  See these references for discussion and examples: * http://gergo.erdi.hu/blog/2012-12-01-static_analysis_with_applicatives/ (discussion: http://www.reddit.com/r/haskell/comments/143wpd/static_analysis_with_applicatives/) * http://paolocapriotti.com/blog/2013/04/03/free-applicative-functors/ (discussion: http://www.reddit.com/r/haskell/comments/1bnql3/free_applicative_functors_icfp_submission/) See Control.Applicative.Operational for the bulk of the documentation. Control.Alternative.Operational also has some significant examples. Version 0.5.0.0
package minioperational
package
This package provides tiny implementation of operational monad. Version 0.4.2
package operational
package
This library makes it easy to implement monads with tricky control flow. This is useful for: writing web applications in a sequential style, programming games with a uniform interface for human and AI players and easy replay capababilities, implementing fast parser monads, designing monadic DSLs, etc. See the project homepage http://haskell.org/haskellwiki/Operational for a more detailed introduction and features. Related packages: MonadPrompt http://hackage.haskell.org/package/MonadPrompt. Version 0.2.2.1