Control.Monad.RWS.Lazy

The RWS monad

type RWS r w s

rws

runRWS

evalRWS

execRWS

mapRWS

withRWS

The RWST monad transformer

data RWST r w s m a

runRWST

evalRWST

execRWST

mapRWST

withRWST

Lazy Reader-writer-state monads