Safe Haskell	None
Language	Haskell2010

Control.Carrier.Interpret

Contents

Interpret carrier
Re-exports

Description

Provides an InterpretC carrier capable of interpreting an arbitrary effect using a passed-in higher order function to interpret that effect. This is suitable for prototyping new effects quickly.

Synopsis

runInterpret :: (HFunctor eff, Monad m) => (forall x. eff m x -> m x) -> (forall s. Reifies s (Handler eff m) => InterpretC s eff m a) -> m a
runInterpretState :: (HFunctor eff, Monad m) => (forall x. s -> eff (StateC s m) x -> m (s, x)) -> s -> (forall t. Reifies t (Handler eff (StateC s m)) => InterpretC t eff (StateC s m) a) -> m (s, a)
newtype InterpretC s (sig :: (* -> *) -> * -> *) m a = InterpretC (m a)
class Reifies s a | s -> a
data Handler sig m
class (HFunctor sig, Monad m) => Algebra sig m | m -> sig
type Has eff sig m = (Members eff sig, Algebra sig m)
run :: Identity a -> a

Interpret carrier

runInterpret :: (HFunctor eff, Monad m) => (forall x. eff m x -> m x) -> (forall s. Reifies s (Handler eff m) => InterpretC s eff m a) -> m a Source #

Interpret an effect using a higher-order function.

Note that due to the higher-rank type, you have to use either $ or explicit application when applying this interpreter. That is, you will need to write runInterpret f (runInterpret g myPrgram) or runInterpret f $ runInterpret g $ myProgram. If you try and write runInterpret f . runInterpret g, you will unfortunately get a rather scary type error!

Since: 1.0.0.0

runInterpretState :: (HFunctor eff, Monad m) => (forall x. s -> eff (StateC s m) x -> m (s, x)) -> s -> (forall t. Reifies t (Handler eff (StateC s m)) => InterpretC t eff (StateC s m) a) -> m (s, a) Source #

Interpret an effect using a higher-order function with some state variable.

Since: 1.0.0.0

newtype InterpretC s (sig :: (* -> *) -> * -> *) m a Source #

Since: 1.0.0.0

Constructors

InterpretC (m a)

Instances

Instances details

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

class Reifies s a | s -> a Source #

Minimal complete definition

reflect

data Handler sig m Source #

A Handler is a function that interprets effects described by sig into the carrier monad m.

Re-exports

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

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

Since: 1.0.0.0

Minimal complete definition

alg

Instances

Instances details

Algebra Choose NonEmpty Source #
Instance details Defined in Control.Algebra Methods alg :: Choose NonEmpty a -> NonEmpty a Source #
Algebra Empty Maybe Source #
Instance details Defined in Control.Algebra Methods alg :: Empty Maybe a -> Maybe a Source #
Algebra NonDet [] Source #
Instance details Defined in Control.Algebra Methods alg :: NonDet [] a -> [a] Source #
Algebra sig m => Algebra sig (Alt m) Source #	This instance permits effectful actions to be lifted into the `Alt` monad, which eases the invocation of repeated alternation with `<\|>`: a <\|> b <\|> c <\|> d is equivalent to getAlt (mconcat [a, b, c, d]) Since: 1.0.1.0
Instance details Defined in Control.Algebra Methods alg :: sig (Alt m) a -> Alt m a Source #
Algebra sig m => Algebra sig (Ap m) Source #	This instance permits effectful actions to be lifted into the `Ap` monad given a monoidal return type, which can provide clarity when chaining calls to `mappend`. mappend <$> act1 <> (mappend <$> act2 <> act3) is equivalent to getAp (act1 <> act2 <> act3) Since: 1.0.1.0
Instance details Defined in Control.Algebra Methods alg :: sig (Ap m) a -> Ap m a Source #
Algebra sig m => Algebra sig (IdentityT m) Source #
Instance details Defined in Control.Algebra Methods alg :: sig (IdentityT m) a -> IdentityT m a Source #
Algebra (Lift IO) IO Source #
Instance details Defined in Control.Algebra Methods alg :: Lift IO IO a -> IO a Source #
Algebra (Lift Identity) Identity Source #
Instance details Defined in Control.Algebra Methods alg :: Lift Identity Identity a -> Identity a Source #
Monad m => Algebra (Lift m) (LiftC m) Source #
Instance details Defined in Control.Carrier.Lift Methods alg :: Lift m (LiftC m) a -> LiftC m a Source #
Algebra (Error e) (Either e) Source #
Instance details Defined in Control.Algebra Methods alg :: Error e (Either e) a -> Either e a Source #
Monoid w => Algebra (Writer w) ((,) w) Source #
Instance details Defined in Control.Algebra Methods alg :: Writer w ((,) w) a -> (w, a) Source #
Algebra (Reader r) ((->) r :: Type -> Type) Source #
Instance details Defined in Control.Algebra Methods alg :: Reader r ((->) r) a -> r -> a Source #
(Algebra sig m, Effect sig) => Algebra (Choose :+: sig) (ChooseC m) Source #
Instance details Defined in Control.Carrier.Choose.Church Methods alg :: (Choose :+: sig) (ChooseC m) a -> ChooseC m a Source #
(Algebra sig m, Effect sig) => Algebra (Empty :+: sig) (EmptyC m) Source #
Instance details Defined in Control.Carrier.Empty.Maybe Methods alg :: (Empty :+: sig) (EmptyC m) a -> EmptyC m a Source #
(Algebra sig m, Effect sig) => Algebra (NonDet :+: sig) (NonDetC m) Source #
Instance details Defined in Control.Carrier.NonDet.Church Methods alg :: (NonDet :+: sig) (NonDetC m) a -> NonDetC m a Source #
(MonadIO m, Algebra sig m) => Algebra (Trace :+: sig) (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Printing Methods alg :: (Trace :+: sig) (TraceC m) a -> TraceC m a Source #
Algebra sig m => Algebra (Trace :+: sig) (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Ignoring Methods alg :: (Trace :+: sig) (TraceC m) a -> TraceC m a Source #
(Algebra sig m, Effect sig) => Algebra (Trace :+: sig) (TraceC m) Source #
Instance details Defined in Control.Carrier.Trace.Returning Methods alg :: (Trace :+: sig) (TraceC m) a -> TraceC m a Source #
(Algebra sig m, Effect sig) => Algebra (Fail :+: sig) (FailC m) Source #
Instance details Defined in Control.Carrier.Fail.Either Methods alg :: (Fail :+: sig) (FailC m) a -> FailC m a Source #
(Algebra sig m, Effect sig) => Algebra (Fresh :+: sig) (FreshC m) Source #
Instance details Defined in Control.Carrier.Fresh.Strict Methods alg :: (Fresh :+: sig) (FreshC m) a -> FreshC m a Source #
(Algebra sig m, Effect sig) => Algebra (Cut :+: (NonDet :+: sig)) (CutC m) Source #
Instance details Defined in Control.Carrier.Cut.Church Methods alg :: (Cut :+: (NonDet :+: sig)) (CutC m) a -> CutC m a Source #
(Algebra sig m, Effect sig) => Algebra (Cull :+: (NonDet :+: sig)) (CullC m) Source #
Instance details Defined in Control.Carrier.Cull.Church Methods alg :: (Cull :+: (NonDet :+: sig)) (CullC m) a -> CullC m a Source #
Algebra sig m => Algebra (Reader r :+: sig) (ReaderT r m) Source #
Instance details Defined in Control.Algebra Methods alg :: (Reader r :+: sig) (ReaderT r m) a -> ReaderT r m a Source #
Algebra sig m => Algebra (Reader r :+: sig) (ReaderC r m) Source #
Instance details Defined in Control.Carrier.Reader Methods alg :: (Reader r :+: sig) (ReaderC r m) a -> ReaderC r m a Source #
(Algebra sig m, Effect sig) => Algebra (State s :+: sig) (StateT s m) Source #
Instance details Defined in Control.Algebra Methods alg :: (State s :+: sig) (StateT s m) a -> StateT s m a Source #
(Algebra sig m, Effect sig) => Algebra (State s :+: sig) (StateT s m) Source #
Instance details Defined in Control.Algebra Methods alg :: (State s :+: sig) (StateT s m) a -> StateT s m a Source #
(Algebra sig m, Effect sig) => Algebra (State s :+: sig) (StateC s m) Source #
Instance details Defined in Control.Carrier.State.Strict Methods alg :: (State s :+: sig) (StateC s m) a -> StateC s m a Source #
(Algebra sig m, Effect sig) => Algebra (State s :+: sig) (StateC s m) Source #
Instance details Defined in Control.Carrier.State.Lazy Methods alg :: (State s :+: sig) (StateC s m) a -> StateC s m a Source #
(Algebra sig m, Effect sig) => Algebra (Throw e :+: sig) (ThrowC e m) Source #
Instance details Defined in Control.Carrier.Throw.Either Methods alg :: (Throw e :+: sig) (ThrowC e m) a -> ThrowC e m a Source #
(Algebra sig m, Effect sig) => Algebra (Error e :+: sig) (ExceptT e m) Source #
Instance details Defined in Control.Algebra Methods alg :: (Error e :+: sig) (ExceptT e m) a -> ExceptT e m a Source #
(Algebra sig m, Effect sig) => Algebra (Error e :+: sig) (ErrorC e m) Source #
Instance details Defined in Control.Carrier.Error.Either Methods alg :: (Error e :+: sig) (ErrorC e m) a -> ErrorC e m a Source #
(Algebra sig m, Effect sig, Monoid w) => Algebra (Writer w :+: sig) (WriterT w m) Source #
Instance details Defined in Control.Algebra Methods alg :: (Writer w :+: sig) (WriterT w m) a -> WriterT w m a Source #
(Algebra sig m, Effect sig, Monoid w) => Algebra (Writer w :+: sig) (WriterT w m) Source #
Instance details Defined in Control.Algebra Methods alg :: (Writer w :+: sig) (WriterT w m) a -> WriterT w m a Source #
(Monoid w, Algebra sig m, Effect sig) => Algebra (Writer w :+: sig) (WriterC w m) Source #
Instance details Defined in Control.Carrier.Writer.Strict Methods alg :: (Writer w :+: sig) (WriterC w m) a -> WriterC w m a Source #
(HFunctor eff, HFunctor sig, Reifies s (Handler eff m), Monad m, Algebra sig m) => Algebra (eff :+: sig) (InterpretC s eff m) Source #
Instance details Defined in Control.Carrier.Interpret Methods alg :: (eff :+: sig) (InterpretC s eff m) a -> InterpretC s eff m a Source #
(LabelledMember label sub sig, HFunctor sub, Algebra sig m) => Algebra (sub :+: sig) (UnderLabel label sub m) Source #
Instance details Defined in Control.Effect.Labelled Methods alg :: (sub :+: sig) (UnderLabel label sub m) a -> UnderLabel label sub m a Source #
(Algebra sig m, Effect sig, Monoid w) => Algebra (Reader r :+: (Writer w :+: (State s :+: sig))) (RWST r w s m) Source #
Instance details Defined in Control.Algebra Methods alg :: (Reader r :+: (Writer w :+: (State s :+: sig))) (RWST r w s m) a -> RWST r w s m a Source #
(Algebra sig m, Effect sig, Monoid w) => Algebra (Reader r :+: (Writer w :+: (State s :+: sig))) (RWST r w s m) Source #
Instance details Defined in Control.Algebra Methods alg :: (Reader r :+: (Writer w :+: (State s :+: sig))) (RWST r w s m) a -> RWST r w s m a Source #
(Algebra (eff :+: sig) (sub m), HFunctor eff, HFunctor sig) => Algebra (Labelled label eff :+: sig) (Labelled label sub m) Source #
Instance details Defined in Control.Effect.Labelled Methods alg :: (Labelled label eff :+: sig) (Labelled label sub m) a -> Labelled label sub m a Source #

type Has eff sig m = (Members eff sig, Algebra sig m) Source #

m is a carrier for sig containing eff.

Note that if eff is a sum, it will be decomposed into multiple Member constraints. While this technically allows one to combine multiple unrelated effects into a single Has constraint, doing so has two significant drawbacks:

Due to a problem with recursive type families, this can lead to significantly slower compiles.
It defeats ghc’s warnings for redundant constraints, and thus can lead to a proliferation of redundant constraints as code is changed.

run :: Identity a -> a Source #

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

Since: 1.0.0.0