Safe Haskell	None
Language	Haskell2010

Control.Effect.Stepped

Synopsis

data SteppedC (e :: Effect) m a
data Steps (e :: Effect) m a where
- Done :: a -> Steps e m a
- More :: e q x -> (x -> m (Steps e m a)) -> Steps e m a
steps :: forall e m a p. (Carrier m, Threaders '[SteppedThreads] m p) => SteppedC e m a -> m (Steps e m a)
unsteps :: forall e m a. (FirstOrder e, Member e (Derivs m), Carrier m) => Steps e m a -> m a
liftSteps :: (MonadTrans t, Monad m) => Steps e m a -> Steps e (t m) a
class (forall m n x. Coercible (e m x) (e n x)) => FirstOrder (e :: Effect)
type SteppedThreads = FreeThreads

Documentation

data SteppedC (e :: Effect) m a Source #

A carrier for any first-order effect e that allows for dividing a computation into several steps, where each step is seperated by the use of the effect.

This can be used to implement coroutines.

Instances

Instances details

(Monoid w, Carrier m, Threaders '[SteppedThreads] m p) => PrimHandler ListenSteppedH (ListenPrim w) (SteppedC (Tell w) m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods effPrimHandler :: EffPrimHandler (ListenPrim w) (SteppedC (Tell w) m) Source #
(FirstOrder e, Carrier m, Threaders '[SteppedThreads] m p) => PrimHandler InterceptH (Unravel (InterceptB e)) (SteppedC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods effPrimHandler :: EffPrimHandler (Unravel (InterceptB e)) (SteppedC e m) Source #
MonadBase b m => MonadBase b (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods liftBase :: b α -> SteppedC e m α #
MonadTrans (SteppedC e) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods lift :: Monad m => m a -> SteppedC e m a #
Monad (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods (>>=) :: SteppedC e m a -> (a -> SteppedC e m b) -> SteppedC e m b # (>>) :: SteppedC e m a -> SteppedC e m b -> SteppedC e m b # return :: a -> SteppedC e m a #
Functor (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods fmap :: (a -> b) -> SteppedC e m a -> SteppedC e m b # (<$) :: a -> SteppedC e m b -> SteppedC e m a #
MonadFail m => MonadFail (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods fail :: String -> SteppedC e m a #
Applicative (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods pure :: a -> SteppedC e m a # (<>) :: SteppedC e m (a -> b) -> SteppedC e m a -> SteppedC e m b # liftA2 :: (a -> b -> c) -> SteppedC e m a -> SteppedC e m b -> SteppedC e m c # (>) :: SteppedC e m a -> SteppedC e m b -> SteppedC e m b # (<*) :: SteppedC e m a -> SteppedC e m b -> SteppedC e m a #
MonadIO m => MonadIO (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods liftIO :: IO a -> SteppedC e m a #
MonadThrow m => MonadThrow (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods throwM :: Exception e0 => e0 -> SteppedC e m a #
MonadCatch m => MonadCatch (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods catch :: Exception e0 => SteppedC e m a -> (e0 -> SteppedC e m a) -> SteppedC e m a #
(Threads (FreeT (FOEff e)) (Prims m), Carrier m) => Carrier (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Associated Types type Derivs (SteppedC e m) :: [Effect] Source # type Prims (SteppedC e m) :: [Effect] Source # Methods algPrims :: Algebra' (Prims (SteppedC e m)) (SteppedC e m) a Source # reformulate :: Monad z => Reformulation' (Derivs (SteppedC e m)) (Prims (SteppedC e m)) (SteppedC e m) z a Source # algDerivs :: Algebra' (Derivs (SteppedC e m)) (SteppedC e m) a Source #
type Derivs (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped type Derivs (SteppedC e m) = e ': Derivs m
type Prims (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped type Prims (SteppedC e m) = Prims m

data Steps (e :: Effect) m a where Source #

A stack of continuations of m that eventually produces a result of type a. Each continuation is seperated by the use of the effect e.

Constructors

Done :: a -> Steps e m a
More :: e q x -> (x -> m (Steps e m a)) -> Steps e m a

Instances

Instances details

Functor m => Monad (Steps e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods (>>=) :: Steps e m a -> (a -> Steps e m b) -> Steps e m b # (>>) :: Steps e m a -> Steps e m b -> Steps e m b # return :: a -> Steps e m a #
Functor m => Functor (Steps e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods fmap :: (a -> b) -> Steps e m a -> Steps e m b # (<$) :: a -> Steps e m b -> Steps e m a #
Functor m => Applicative (Steps e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods pure :: a -> Steps e m a # (<>) :: Steps e m (a -> b) -> Steps e m a -> Steps e m b # liftA2 :: (a -> b -> c) -> Steps e m a -> Steps e m b -> Steps e m c # (>) :: Steps e m a -> Steps e m b -> Steps e m b # (<*) :: Steps e m a -> Steps e m b -> Steps e m a #

steps :: forall e m a p. (Carrier m, Threaders '[SteppedThreads] m p) => SteppedC e m a -> m (Steps e m a) Source #

Run the first-order effect e by breaking the computation using it into steps, where each step is seperated by the use of an action of e.

Derivs (SteppedC e m) = e ': Derivs m

Prims  (SteppedC e m) = Prims m

unsteps :: forall e m a. (FirstOrder e, Member e (Derivs m), Carrier m) => Steps e m a -> m a Source #

Execute all the steps of a computation.

liftSteps :: (MonadTrans t, Monad m) => Steps e m a -> Steps e (t m) a Source #

class (forall m n x. Coercible (e m x) (e n x)) => FirstOrder (e :: Effect) Source #

A constraint that e is first-order.

This is automatically deduced by the compiler.

Instances

Instances details

(forall (m :: Type -> Type) (n :: Type -> Type) x. Coercible (e m x) (e n x)) => FirstOrder e Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped

type SteppedThreads = FreeThreads Source #

SteppedThreads accepts the following primitive effects:

Regional s
Optional s (when s is a functor)
Unravel p
ListenPrim o (when o is a Monoid)
ReaderPrim i