data-accessor-monads-fd-0.2: Use Accessor to access state in monads-fd State monad class Source code Contents Index

Data.Accessor.Monad.FD.State

Contents accessors in the form of actions in the state monad lift a state monadic accessor to an accessor of a parent record

Description

Access helper functions in the State monad class

Synopsis

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.

(%=) :: MonadState r m => T r a -> a -> m () Source

Infix variant of set.

(%:) :: MonadState r m => T r a -> (a -> a) -> m () Source

Infix variant of modify.

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

lift :: MonadState r mr => T r s -> State s a -> mr a Source

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

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