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Control.Monad.RWS.Lazy |

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

Description
Lazy RWS monad. 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 | Source

Constructors

RWS |

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

Instances

Monoid w => MonadRWS r w s (RWS r w s)
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) | Source

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

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

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

newtype RWST r w s m a | Source

Constructors

RWST |

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

Instances

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

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

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

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

module Control.Monad.RWS.Class
module Control.Monad
module Control.Monad.Fix
module Control.Monad.Trans
module Data.Monoid
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