Safe Haskell	None
Language	Haskell2010

Control.Effect.Fresh

Synopsis

Documentation

Constructors

Fresh (Int -> k)
Reset (m b) (b -> k)

Instances

Effect Fresh Source #
Instance details 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)) Source #
HFunctor Fresh Source #
Instance details Defined in Control.Effect.Fresh Methods fmap' :: (a -> b) -> Fresh m a -> Fresh m b Source # hmap :: (forall x. m x -> n x) -> Fresh m a -> Fresh n a Source #
Functor (Fresh m) Source #
Instance details 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) Source #
Instance details Defined in Control.Effect.Fresh Methods ret :: a -> FreshC m a Source # eff :: (Fresh :+: sig) (FreshC m) (FreshC m a) -> FreshC m a Source #

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

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

Reset the fresh counter after running a computation.

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

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 Source #

Constructors

FreshC
Fields runFreshC :: Int -> m (Int, a)

Instances

(Carrier sig m, Effect sig, Monad m) => Carrier (Fresh :+: sig) (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods ret :: a -> FreshC m a Source # eff :: (Fresh :+: sig) (FreshC m) (FreshC m a) -> FreshC m a Source #