Control.Monad.RWS.Lazy
The RWS monad
type
RWS
r w s
runRWS
evalRWS
execRWS
mapRWS
withRWS
The RWST monad transformer
data
RWST
r w s m a
evalRWST
execRWST
mapRWST
withRWST
Lazy Reader-writer-state monads