Control.Effect.Fresh

Documentation

data Fresh m k

Constructors

Fresh (Int -> k)

Reset (m b) (b -> k)

Instances

Effect Fresh

Defined in Control.Effect.Fresh

Methods

handle :: Functor f => f () -> (forall x. f (m x) -> n (f x)) -> Fresh m (m a) -> Fresh n (n (f a))

HFunctor Fresh

Defined in Control.Effect.Fresh

Methods

fmap' :: (a -> b) -> Fresh m a -> Fresh m b

hmap :: (forall x. m x -> n x) -> Fresh m a -> Fresh n a

Functor (Fresh m)

Defined in Control.Effect.Fresh

Methods

fmap :: (a -> b) -> Fresh m a -> Fresh m b

(<$) :: a -> Fresh m b -> Fresh m a

(Carrier sig m, Effect sig, Monad m) => Carrier (Fresh :+: sig) (FreshC m)

Defined in Control.Effect.Fresh

Methods

ret :: a -> FreshC m a

eff :: (Fresh :+: sig) (FreshC m) (FreshC m a) -> FreshC m a

fresh :: (Member Fresh sig, Carrier sig m) => m Int

Produce a fresh (i.e. unique) Int.

run (runFresh (replicateM n fresh)) == nub (run (runFresh (replicateM n fresh)))

resetFresh :: (Member Fresh sig, Carrier sig m) => m a -> m a

Reset the fresh counter after running a computation.

run (runFresh (resetFresh (replicateM m fresh) *> replicateM n fresh)) == run (runFresh (replicateM n fresh))

runFresh :: (Carrier sig m, Effect sig, Monad m) => Eff (FreshC m) a -> m a

Run a Fresh effect counting up from 0.

run (runFresh (replicateM n fresh)) == [0..pred n]

run (runFresh (replicateM n fresh *> pure b)) == b

newtype FreshC m a

Constructors

FreshC

Fields

• runFreshC :: Int -> m (Int, a)

Instances

(Carrier sig m, Effect sig, Monad m) => Carrier (Fresh :+: sig) (FreshC m)

Defined in Control.Effect.Fresh

Methods

ret :: a -> FreshC m a

eff :: (Fresh :+: sig) (FreshC m) (FreshC m a) -> FreshC m a