fused-effects-0.5.0.1: A fast, flexible, fused effect system.
Safe HaskellNone
LanguageHaskell2010

Control.Effect.State.Lazy

Synopsis

State effect

Lazy state carrier

runState :: s -> StateC s m a -> m (s, a) Source #

Run a lazy State effect, yielding the result value and the final state. More programs terminate with lazy state than strict state, but injudicious use of lazy state may lead to thunk buildup.

run (runState a (pure b)) === (a, b)
take 5 . snd . run $ runState () (traverse pure [1..]) === [1,2,3,4,5]

evalState :: forall s m a. Functor m => s -> StateC s m a -> m a Source #

Run a lazy State effect, yielding the result value and discarding the final state.

run (evalState a (pure b)) === b

execState :: forall s m a. Functor m => s -> StateC s m a -> m s Source #

Run a lazy State effect, yielding the final state and discarding the return value.

run (execState a (pure b)) === a

newtype StateC s m a Source #

Constructors

StateC 

Fields

Instances

Instances details
MonadTrans (StateC s) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

lift :: Monad m => m a -> StateC s m a #

Monad m => Monad (StateC s m) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

(>>=) :: StateC s m a -> (a -> StateC s m b) -> StateC s m b #

(>>) :: StateC s m a -> StateC s m b -> StateC s m b #

return :: a -> StateC s m a #

Functor m => Functor (StateC s m) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

fmap :: (a -> b) -> StateC s m a -> StateC s m b #

(<$) :: a -> StateC s m b -> StateC s m a #

MonadFix m => MonadFix (StateC s m) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

mfix :: (a -> StateC s m a) -> StateC s m a #

MonadFail m => MonadFail (StateC s m) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

fail :: String -> StateC s m a #

(Functor m, Monad m) => Applicative (StateC s m) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

pure :: a -> StateC s m a #

(<*>) :: StateC s m (a -> b) -> StateC s m a -> StateC s m b #

liftA2 :: (a -> b -> c) -> StateC s m a -> StateC s m b -> StateC s m c #

(*>) :: StateC s m a -> StateC s m b -> StateC s m b #

(<*) :: StateC s m a -> StateC s m b -> StateC s m a #

MonadIO m => MonadIO (StateC s m) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

liftIO :: IO a -> StateC s m a #

(Alternative m, Monad m) => Alternative (StateC s m) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

empty :: StateC s m a #

(<|>) :: StateC s m a -> StateC s m a -> StateC s m a #

some :: StateC s m a -> StateC s m [a] #

many :: StateC s m a -> StateC s m [a] #

(Alternative m, Monad m) => MonadPlus (StateC s m) Source # 
Instance details

Defined in Control.Effect.State.Lazy

Methods

mzero :: StateC s m a #

mplus :: StateC s m a -> StateC s m a -> StateC s m a #

(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 #

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

Instances details
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 #

run :: PureC a -> a Source #

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