Haskell Hierarchical Libraries (base package)ContentsIndex
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.

Synopsis
class Monad m => MonadReader r m | m -> r where
ask :: m r
local :: (r -> r) -> m a -> m a
asks :: MonadReader r m => (r -> a) -> m a
newtype Reader r a = Reader {
runReader :: (r -> a)
}
mapReader :: (a -> b) -> Reader r a -> Reader r b
withReader :: (r' -> r) -> Reader r a -> Reader r' a
newtype ReaderT r m a = ReaderT {
runReaderT :: (r -> m a)
}
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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