| Safe Haskell | Safe |
|---|---|
| Language | Haskell98 |
Data.Accessor.Monad.MTL.State
Contents
Description
Access helper functions in the State monad class
- set :: MonadState r m => T r a -> a -> m ()
- get :: MonadState r m => T r a -> m a
- modify :: MonadState r m => T r a -> (a -> a) -> m ()
- getAndModify :: MonadState r m => T r a -> (a -> a) -> m a
- modifyAndGet :: MonadState r m => T r a -> (a -> a) -> m a
- (%=) :: MonadState r m => T r a -> a -> m ()
- (%:) :: MonadState r m => T r a -> (a -> a) -> m ()
- lift :: MonadState r mr => T r s -> State s a -> mr a
- liftT :: (Monad m, MonadTrans t, MonadState r (t m)) => T r s -> StateT s m a -> t m a
accessors in the form of actions in the state monad
set :: MonadState r m => T r a -> a -> m () Source #
get :: MonadState r m => T r a -> m a Source #
modify :: MonadState r m => T r a -> (a -> a) -> m () Source #
getAndModify :: MonadState r m => T r a -> (a -> a) -> m a Source #
Modify a record element and return its old value.
modifyAndGet :: MonadState r m => T r a -> (a -> a) -> m a Source #
Modify a record element and return its new value.
lift a state monadic accessor to an accessor of a parent record
liftT :: (Monad m, MonadTrans t, MonadState r (t m)) => T r s -> StateT s m a -> t m a Source #