5 Mar
2010
5 Mar
'10
10:37 a.m.
Stephen Tetley wrote:
To work with monads in Haskell its not ignoble simple to decide what effect or combination of effects you want and use the relevant monad (for a single effect) or build a transformer (for multiple effects).
... or use the "free term algebra" approach outlined in http://apfelmus.nfshost.com/articles/operational-monad.html when the semantics of the effects are a bit tricky to fit into existing transformers. My package "operational" http://projects.haskell.org/operational/ contains a bunch of examples. Regards, Heinrich Apfelmus -- http://apfelmus.nfshost.com