Data.Accessor.Monad.TF.State

Access helper functions in the State monad type family

accessors in the form of actions in the state monad

set :: MonadState m => T (StateType m) a -> a -> m ()

get :: MonadState m => T (StateType m) a -> m a

modify :: MonadState m => T (StateType m) a -> (a -> a) -> m ()

getAndModify :: MonadState m => T (StateType m) a -> (a -> a) -> m a

Modify a record element and return its old value.

modifyAndGet :: MonadState m => T (StateType m) a -> (a -> a) -> m a

Modify a record element and return its new value.

(%=) :: MonadState m => T (StateType m) a -> a -> m ()

Infix variant of set.

(%:) :: MonadState m => T (StateType m) a -> (a -> a) -> m ()

Infix variant of modify.

lift a state monadic accessor to an accessor of a parent record

lift :: MonadState mr => T (StateType mr) s -> State s a -> mr a

liftT :: (Monad m, MonadTrans t, MonadState (t m)) => T (StateType (t m)) s -> StateT s m a -> t m a