Safe Haskell	None
Language	Haskell2010

Control.Effect.Fresh

Contents

Fresh effect
Fresh carrier
Re-exports

Synopsis

data Fresh m k
- = Fresh (Int -> m k)
- | Reset (m b) (b -> m k)
fresh :: (Member Fresh sig, Carrier sig m) => m Int
resetFresh :: (Member Fresh sig, Carrier sig m) => m a -> m a
runFresh :: Functor m => FreshC m a -> m a
newtype FreshC m a = FreshC {
- runFreshC :: StateC Int m a
}
class (HFunctor sig, Monad m) => Carrier sig m | m -> sig
class Member (sub :: (* -> *) -> * -> *) sup
run :: PureC a -> a

Fresh effect

data Fresh m k Source #

Constructors

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

Instances

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

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

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 Source #

Reset the fresh counter after running a computation.

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

Fresh carrier

runFresh :: Functor m => FreshC m a -> m a Source #

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 :: StateC Int m a

Instances

MonadTrans FreshC Source #
Instance details Defined in Control.Effect.Fresh Methods lift :: Monad m => m a -> FreshC m a #
Monad m => Monad (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods (>>=) :: FreshC m a -> (a -> FreshC m b) -> FreshC m b # (>>) :: FreshC m a -> FreshC m b -> FreshC m b # return :: a -> FreshC m a # fail :: String -> FreshC m a #
Functor m => Functor (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods fmap :: (a -> b) -> FreshC m a -> FreshC m b # (<$) :: a -> FreshC m b -> FreshC m a #
MonadFix m => MonadFix (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods mfix :: (a -> FreshC m a) -> FreshC m a #
MonadFail m => MonadFail (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods fail :: String -> FreshC m a #
Monad m => Applicative (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods pure :: a -> FreshC m a # (<>) :: FreshC m (a -> b) -> FreshC m a -> FreshC m b # liftA2 :: (a -> b -> c) -> FreshC m a -> FreshC m b -> FreshC m c # (>) :: FreshC m a -> FreshC m b -> FreshC m b # (<*) :: FreshC m a -> FreshC m b -> FreshC m a #
MonadIO m => MonadIO (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods liftIO :: IO a -> FreshC m a #
(Alternative m, Monad m) => Alternative (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods empty :: FreshC m a # (<\|>) :: FreshC m a -> FreshC m a -> FreshC m a # some :: FreshC m a -> FreshC m [a] # many :: FreshC m a -> FreshC m [a] #
(Alternative m, Monad m) => MonadPlus (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods mzero :: FreshC m a # mplus :: FreshC m a -> FreshC m a -> FreshC m a #
(Carrier sig m, Effect sig) => Carrier (Fresh :+: sig) (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods eff :: (Fresh :+: sig) (FreshC m) a -> FreshC m a Source #

Re-exports

class (HFunctor sig, Monad m) => Carrier sig m | m -> sig Source #

The class of carriers (results) for algebras (effect handlers) over signatures (effects), whose actions are given by the eff method.

Minimal complete definition

eff

Instances

Carrier Pure PureC Source #
Instance details Defined in Control.Effect.Carrier Methods eff :: Pure PureC a -> PureC a Source #
(HFunctor eff, Carrier sig m, Member eff sig) => Carrier sig (InterposeC eff m) Source #
Instance details Defined in Control.Effect.Interpose Methods eff :: sig (InterposeC eff m) a -> InterposeC eff m a Source #
Monad m => Carrier (Lift m) (LiftC m) Source #
Instance details Defined in Control.Effect.Lift Methods eff :: Lift m (LiftC m) a -> LiftC m a Source #
(Carrier sig m, MonadIO m) => Carrier (Resource :+: sig) (ResourceC m) Source #
Instance details Defined in Control.Effect.Resource Methods eff :: (Resource :+: sig) (ResourceC m) a -> ResourceC m a Source #
(Carrier sig m, Effect sig) => Carrier (NonDet :+: sig) (NonDetC m) Source #
Instance details Defined in Control.Effect.NonDet Methods eff :: (NonDet :+: sig) (NonDetC m) a -> NonDetC m a Source #
(Carrier sig m, Effect sig) => Carrier (NonDet :+: sig) (OnceC m) Source #
Instance details Defined in Control.Effect.Cull Methods eff :: (NonDet :+: sig) (OnceC m) a -> OnceC m a Source #
(Carrier sig m, Effect sig) => Carrier (Fresh :+: sig) (FreshC m) Source #
Instance details Defined in Control.Effect.Fresh Methods eff :: (Fresh :+: sig) (FreshC m) a -> FreshC m a Source #
(Carrier sig m, Effect sig) => Carrier (Fail :+: sig) (FailC m) Source #
Instance details Defined in Control.Effect.Fail Methods eff :: (Fail :+: sig) (FailC m) a -> FailC m a Source #
(Carrier sig m, Effect sig) => Carrier (Cut :+: (NonDet :+: sig)) (CutC m) Source #
Instance details Defined in Control.Effect.Cut Methods eff :: (Cut :+: (NonDet :+: sig)) (CutC m) a -> CutC m a Source #
(Carrier sig m, Effect sig) => Carrier (Cull :+: (NonDet :+: sig)) (CullC m) Source #
Instance details Defined in Control.Effect.Cull Methods eff :: (Cull :+: (NonDet :+: sig)) (CullC m) a -> CullC m a Source #
(Carrier sig m, Effect sig) => Carrier (Trace :+: sig) (TraceByReturningC m) Source #
Instance details Defined in Control.Effect.Trace Methods eff :: (Trace :+: sig) (TraceByReturningC m) a -> TraceByReturningC m a Source #
Carrier sig m => Carrier (Trace :+: sig) (TraceByIgnoringC m) Source #
Instance details Defined in Control.Effect.Trace Methods eff :: (Trace :+: sig) (TraceByIgnoringC m) a -> TraceByIgnoringC m a Source #
(MonadIO m, Carrier sig m) => Carrier (Trace :+: sig) (TraceByPrintingC m) Source #
Instance details Defined in Control.Effect.Trace Methods eff :: (Trace :+: sig) (TraceByPrintingC m) a -> TraceByPrintingC m a Source #
(HFunctor eff, Carrier sig m) => Carrier (eff :+: sig) (InterpretC eff m) Source #
Instance details Defined in Control.Effect.Interpret Methods eff :: (eff :+: sig) (InterpretC eff m) a -> InterpretC eff m a Source #
(Carrier sig m, Effect sig) => Carrier (State s :+: sig) (StateC s m) Source #
Instance details Defined in Control.Effect.State.Strict Methods eff :: (State s :+: sig) (StateC s m) a -> StateC s m a Source #
(Carrier sig m, Effect sig) => Carrier (State s :+: sig) (StateC s m) Source #
Instance details Defined in Control.Effect.State.Lazy Methods eff :: (State s :+: sig) (StateC s m) a -> StateC s m a Source #
Carrier sig m => Carrier (Reader r :+: sig) (ReaderC r m) Source #
Instance details Defined in Control.Effect.Reader Methods eff :: (Reader r :+: sig) (ReaderC r m) a -> ReaderC r m a Source #
(Carrier sig m, Effect sig, RandomGen g) => Carrier (Random :+: sig) (RandomC g m) Source #
Instance details Defined in Control.Effect.Random Methods eff :: (Random :+: sig) (RandomC g m) a -> RandomC g m a Source #
(Carrier sig m, Effect sig) => Carrier (Error e :+: sig) (ErrorC e m) Source #
Instance details Defined in Control.Effect.Error Methods eff :: (Error e :+: sig) (ErrorC e m) a -> ErrorC e m a Source #
Carrier sig m => Carrier (Resumable err :+: sig) (ResumableWithC err m) Source #
Instance details Defined in Control.Effect.Resumable Methods eff :: (Resumable err :+: sig) (ResumableWithC err m) a -> ResumableWithC err m a Source #
(Carrier sig m, Effect sig) => Carrier (Resumable err :+: sig) (ResumableC err m) Source #
Instance details Defined in Control.Effect.Resumable Methods eff :: (Resumable err :+: sig) (ResumableC err m) a -> ResumableC err m a Source #
(Monoid w, Carrier sig m, Effect sig) => Carrier (Writer w :+: sig) (WriterC w m) Source #
Instance details Defined in Control.Effect.Writer Methods eff :: (Writer w :+: sig) (WriterC w m) a -> WriterC w m a Source #
(HFunctor eff, Carrier sig m, Effect sig) => Carrier (eff :+: sig) (InterpretStateC eff s m) Source #
Instance details Defined in Control.Effect.Interpret Methods eff :: (eff :+: sig) (InterpretStateC eff s m) a -> InterpretStateC eff s m a Source #

class Member (sub :: (* -> *) -> * -> *) sup Source #

Minimal complete definition

inj, prj

Instances

Member sub sub Source #
Instance details Defined in Control.Effect.Sum Methods inj :: sub m a -> sub m a Source # prj :: sub m a -> Maybe (sub m a) Source #
Member sub sup => Member sub (sub' :+: sup) Source #
Instance details Defined in Control.Effect.Sum Methods inj :: sub m a -> (sub' :+: sup) m a Source # prj :: (sub' :+: sup) m a -> Maybe (sub m a) Source #
Member sub (sub :+: sup) Source #
Instance details Defined in Control.Effect.Sum Methods inj :: sub m a -> (sub :+: sup) m a Source # prj :: (sub :+: sup) m a -> Maybe (sub m a) Source #

run :: PureC a -> a Source #

Run an action exhausted of effects to produce its final result value.