Control.Monad.Reader

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

Description

Declaration of the Monoid class,and instances for list and functions

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

class Monad m => MonadReader r m | m -> r where

Methods

ask :: m r

local :: (r -> r) -> m a -> m a

Instances

MonadReader r (Reader r)

MonadReader r ((->) r)

MonadReader s m => MonadReader s (ListT m)

(Error e, MonadReader r m) => MonadReader r (ErrorT e m)

Monad m => MonadReader r (ReaderT r m)

MonadReader r m => MonadReader r (StateT s m)

(Monoid w, MonadReader r m) => MonadReader r (WriterT w m)

MonadReader r' m => MonadReader r' (ContT r m)

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

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

asks :: MonadReader r m => (r -> a) -> m a

newtype Reader r a

Constructors

Reader

runReader :: (r -> a)

Instances

MonadReader r (Reader r)

Functor (Reader r)

Monad (Reader r)

MonadFix (Reader r)

mapReader :: (a -> b) -> Reader r a -> Reader r b

withReader :: (r' -> r) -> Reader r a -> Reader r' a

newtype ReaderT r m a

Constructors

ReaderT

runReaderT :: (r -> m a)

Instances

MonadError e m => MonadError e (ReaderT r m)

Monad m => MonadReader r (ReaderT r m)

MonadState s m => MonadState s (ReaderT r m)

MonadWriter w m => MonadWriter w (ReaderT r m)

MonadTrans (ReaderT r)

Monad m => Functor (ReaderT r m)

Monad m => Monad (ReaderT r m)

MonadCont m => MonadCont (ReaderT r m)

MonadFix m => MonadFix (ReaderT r m)

MonadIO m => MonadIO (ReaderT r m)

MonadPlus m => MonadPlus (ReaderT r m)

mapReaderT :: (m a -> n b) -> ReaderT w m a -> ReaderT w n b

withReaderT :: (r' -> r) -> ReaderT r m a -> ReaderT r' m a

module Control.Monad

module Control.Monad.Fix

module Control.Monad.Trans

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