Safe Haskell	None
Language	Haskell2010

Foundation.Monad.State

Contents

MonadState
StateT

Synopsis

MonadState

class Monad m => MonadState m where Source #

Minimal complete definition

withState

Associated Types

type State m Source #

Methods

withState :: (State m -> (a, State m)) -> m a Source #

Instances

MonadState Check Source #
Associated Types type State (Check :: * -> ) :: Source # Methods withState :: (State Check -> (a, State Check)) -> Check a Source #
(Functor m, Monad m) => MonadState (StateT s m) Source #
Associated Types type State (StateT s m :: * -> ) :: Source # Methods withState :: (State (StateT s m) -> (a, State (StateT s m))) -> StateT s m a Source #

get :: MonadState m => m (State m) Source #

put :: MonadState m => State m -> m () Source #

StateT

data StateT s m a Source #

State Transformer

Instances

MonadTrans (StateT s) Source #
Methods lift :: Monad m => m a -> StateT s m a Source #
(Functor m, Monad m) => Monad (StateT s m) Source #
Methods (>>=) :: StateT s m a -> (a -> StateT s m b) -> StateT s m b # (>>) :: StateT s m a -> StateT s m b -> StateT s m b # return :: a -> StateT s m a # fail :: String -> StateT s m a #
Functor m => Functor (StateT s m) Source #
Methods fmap :: (a -> b) -> StateT s m a -> StateT s m b # (<$) :: a -> StateT s m b -> StateT s m a #
(Applicative m, Monad m) => Applicative (StateT s m) Source #
Methods pure :: a -> StateT s m a # (<>) :: StateT s m (a -> b) -> StateT s m a -> StateT s m b # (>) :: StateT s m a -> StateT s m b -> StateT s m b # (<*) :: StateT s m a -> StateT s m b -> StateT s m a #
(Functor m, MonadIO m) => MonadIO (StateT s m) Source #
Methods liftIO :: IO a -> StateT s m a #
(Functor m, MonadCatch m) => MonadCatch (StateT s m) Source #
Methods catch :: Exception e => StateT s m a -> (e -> StateT s m a) -> StateT s m a Source #
(Functor m, MonadThrow m) => MonadThrow (StateT s m) Source #
Methods throw :: Exception e => e -> StateT s m a Source #
(Functor m, MonadFailure m) => MonadFailure (StateT s m) Source #
Associated Types type Failure (StateT s m :: * -> ) :: Source # Methods mFail :: Failure (StateT s m) -> StateT s m () Source #
(Functor m, Monad m) => MonadState (StateT s m) Source #
Associated Types type State (StateT s m :: * -> ) :: Source # Methods withState :: (State (StateT s m) -> (a, State (StateT s m))) -> StateT s m a Source #
type Failure (StateT s m) Source #
type Failure (StateT s m) = Failure m
type State (StateT s m) Source #
type State (StateT s m) = s

runStateT :: StateT s m a -> s -> m (a, s) Source #