Control.Monad.RWS

Portability	non-portable ( mulit-param classes, functional dependencies )
Stability	experimental
Maintainer	libraries@haskell.org

Description

Declaration of the MonadRWS class.

Inspired by the paper Functional Programming with Overloading and Higher-Order Polymorphism, Mark P Jones (http://www.cse.ogi.edu/~mpj) Advanced School of Functional Programming, 1995.

data RWS r w s a

Constructors

RWS

runRWS :: (r -> s -> (a, s, w))

Instances

Functor (RWS r w s)

(Monoid w) => Monad (RWS r w s)

(Monoid w) => MonadFix (RWS r w s)

(Monoid w) => MonadReader r (RWS r w s)

(Monoid w) => MonadWriter w (RWS r w s)

(Monoid w) => MonadState s (RWS r w s)

runRWS :: RWS r w s a -> r -> s -> (a, s, w)

evalRWS :: RWS r w s a -> r -> s -> (a, w)

execRWS :: RWS r w s a -> r -> s -> (s, w)

mapRWS :: ((a, s, w) -> (b, s, w')) -> RWS r w s a -> RWS r w' s b

withRWS :: (r' -> s -> (r, s)) -> RWS r w s a -> RWS r' w s a

data RWST r w s m a

Constructors

RWST

runRWST :: (r -> s -> m (a, s, w))

Instances

(Monoid w, MonadCont m) => MonadCont (RWST r w s m)

(Monoid w, MonadError e m) => MonadError e (RWST r w s m)

(Monad m) => Functor (RWST r w s m)

(Monoid w, Monad m) => Monad (RWST r w s m)

(Monoid w, MonadPlus m) => MonadPlus (RWST r w s m)

(Monoid w, MonadFix m) => MonadFix (RWST r w s m)

(Monoid w, Monad m) => MonadReader r (RWST r w s m)

(Monoid w, Monad m) => MonadWriter w (RWST r w s m)

(Monoid w, Monad m) => MonadState s (RWST r w s m)

(Monoid w) => MonadTrans (RWST r w s)

(Monoid w, MonadIO m) => MonadIO (RWST r w s m)

runRWST :: RWST r w s m a -> r -> s -> m (a, s, w)

evalRWST :: (Monad m) => RWST r w s m a -> r -> s -> m (a, w)

execRWST :: (Monad m) => RWST r w s m a -> r -> s -> m (s, w)

mapRWST :: (m (a, s, w) -> n (b, s, w')) -> RWST r w s m a -> RWST r w' s n b

withRWST :: (r' -> s -> (r, s)) -> RWST r w s m a -> RWST r' w s m a

module Control.Monad

module Control.Monad.Fix

module Control.Monad.Trans

module Control.Monad.Reader

module Control.Monad.Writer

module Control.Monad.State

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