DeepControl.Monad.State

Documentation

class Monad m => MonadState s m | m -> s where

Minimal definition is either both of get and put or just state

Minimal complete definition

state | get, put

Methods

get :: m s

Return the state from the internals of the monad.

put :: s -> m ()

Replace the state inside the monad.

state :: (s -> (a, s)) -> m a

Embed a simple state action into the monad.

Instances

MonadState s m => MonadState s (MaybeT m)

MonadState s m => MonadState s (ListT m)

MonadState s m => MonadState s (IdentityT m)

MonadState s (State s)

(Monoid w, MonadState s m) => MonadState s (WriterT w m)

(Monoid w, MonadState s m) => MonadState s (WriterT w m)

Monad m => MonadState s (StateT s m)

Monad m => MonadState s (StateT s m)

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

MonadState s m => MonadState s (ExceptT e m)

(Error e, MonadState s m) => MonadState s (ErrorT e m)

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

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

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

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

modify :: MonadState s m => (s -> s) -> m ()

gets :: MonadState s m => (s -> a) -> m a

newtype State s a

Constructors

State

Fields

runState :: s -> (a, s)

Instances

MonadState s (State s)

Monad (State s)

Functor (State s)

Applicative (State s)

evalState :: State s a -> s -> a

execState :: State s a -> s -> s