Control.Monad.RWS

Portability	non-portable (multi-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.

Documentation

newtype RWS r w s a

Constructors

RWS

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

Instances

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

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

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

Functor (RWS r w s)

Monoid w => Monad (RWS r w s)

Monoid w => MonadFix (RWS r w s)

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

newtype RWST r w s m a

Constructors

RWST

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

Instances

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

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

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

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

Monoid w => MonadTrans (RWST r w s)

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

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

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

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

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

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

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.Reader

module Control.Monad.Writer

module Control.Monad.State

Produced by Haddock version 0.7