Data.Accessor.MonadState

Deprecated: please use Data.Accessor.Monad.Trans.State from data-accessor-transformers

Access helper functions in a State monad

accessors in the form of actions in the state monad

set :: Monad m => T r a -> a -> StateT r m ()

get :: Monad m => T r a -> StateT r m a

modify :: Monad m => T r a -> (a -> a) -> StateT r m ()

getAndModify :: Monad m => T r a -> (a -> a) -> StateT r m a

Modify a record element and return its old value.

modifyAndGet :: Monad m => T r a -> (a -> a) -> StateT r m a

Modify a record element and return its new value.

(%=) :: Monad m => T r a -> a -> StateT r m () infix 1

Infix variant of set.

(%:) :: Monad m => T r a -> (a -> a) -> StateT r m () infix 1

Infix variant of modify.

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

lift :: Monad m => T r s -> State s a -> StateT r m a

liftT :: Monad m => T r s -> StateT s m a -> StateT r m a