Control.Effect.Sum

Documentation

data (f :+: g) (m :: * -> *) k infixr 4

Constructors

L (f m k)

R (g m k)

Instances

Member sub sup => Member sub (sub' :+: sup)

Defined in Control.Effect.Sum

Methods

inj :: sub m a -> (sub' :+: sup) m a

prj :: (sub' :+: sup) m a -> Maybe (sub m a)

Member sub (sub :+: sup)

Defined in Control.Effect.Sum

Methods

inj :: sub m a -> (sub :+: sup) m a

prj :: (sub :+: sup) m a -> Maybe (sub m a)

(Effect l, Effect r) => Effect (l :+: r)

Defined in Control.Effect.Sum

Methods

handle :: Functor f => f () -> (forall x. f (m x) -> n (f x)) -> (l :+: r) m (m a) -> (l :+: r) n (n (f a))

(HFunctor l, HFunctor r) => HFunctor (l :+: r)

Defined in Control.Effect.Sum

Methods

fmap' :: (a -> b) -> (l :+: r) m a -> (l :+: r) m b

hmap :: (forall x. m x -> n x) -> (l :+: r) m a -> (l :+: r) n a

(Carrier sig m, Effect sig) => Carrier (Fail :+: sig) (FailC m)

Defined in Control.Effect.Fail

Methods

ret :: a -> FailC m a

eff :: (Fail :+: sig) (FailC m) (FailC m a) -> FailC m a

(Carrier sig m, MonadIO m) => Carrier (Resource :+: sig) (ResourceC m)

Defined in Control.Effect.Resource

Methods

ret :: a -> ResourceC m a

eff :: (Resource :+: sig) (ResourceC m) (ResourceC m a) -> ResourceC m a

(Carrier sig m, Effect sig, Monad m) => Carrier (Fresh :+: sig) (FreshC m)

Defined in Control.Effect.Fresh

Methods

ret :: a -> FreshC m a

eff :: (Fresh :+: sig) (FreshC m) (FreshC m a) -> FreshC m a

(Carrier sig m, Effect sig) => Carrier (Trace :+: sig) (TraceByReturningC m)

Defined in Control.Effect.Trace

Methods

ret :: a -> TraceByReturningC m a

eff :: (Trace :+: sig) (TraceByReturningC m) (TraceByReturningC m a) -> TraceByReturningC m a

Carrier sig m => Carrier (Trace :+: sig) (TraceByIgnoringC m)

Defined in Control.Effect.Trace

Methods

ret :: a -> TraceByIgnoringC m a

eff :: (Trace :+: sig) (TraceByIgnoringC m) (TraceByIgnoringC m a) -> TraceByIgnoringC m a

(MonadIO m, Carrier sig m) => Carrier (Trace :+: sig) (TraceByPrintingC m)

Defined in Control.Effect.Trace

Methods

ret :: a -> TraceByPrintingC m a

eff :: (Trace :+: sig) (TraceByPrintingC m) (TraceByPrintingC m a) -> TraceByPrintingC m a

(Alternative f, Monad f, Traversable f, Carrier sig m, Effect sig, Applicative m) => Carrier (NonDet :+: sig) (AltC f m)

Defined in Control.Effect.NonDet

Methods

ret :: a -> AltC f m a

eff :: (NonDet :+: sig) (AltC f m) (AltC f m a) -> AltC f m a

(Carrier sig m, Effect sig, RandomGen g, Monad m) => Carrier (Random :+: sig) (RandomC g m)

Defined in Control.Effect.Random

Methods

ret :: a -> RandomC g m a

eff :: (Random :+: sig) (RandomC g m) (RandomC g m a) -> RandomC g m a

(Carrier sig m, Effect sig) => Carrier (State s :+: sig) (StateC s m)

Defined in Control.Effect.State

Methods

ret :: a -> StateC s m a

eff :: (State s :+: sig) (StateC s m) (StateC s m a) -> StateC s m a

(Carrier sig m, Monad m) => Carrier (Resumable err :+: sig) (ResumableWithC err m)

Defined in Control.Effect.Resumable

Methods

ret :: a -> ResumableWithC err m a

eff :: (Resumable err :+: sig) (ResumableWithC err m) (ResumableWithC err m a) -> ResumableWithC err m a

(Carrier sig m, Effect sig) => Carrier (Resumable err :+: sig) (ResumableC err m)

Defined in Control.Effect.Resumable

Methods

ret :: a -> ResumableC err m a

eff :: (Resumable err :+: sig) (ResumableC err m) (ResumableC err m a) -> ResumableC err m a

(Carrier sig m, Monad m) => Carrier (Reader r :+: sig) (ReaderC r m)

Defined in Control.Effect.Reader

Methods

ret :: a -> ReaderC r m a

eff :: (Reader r :+: sig) (ReaderC r m) (ReaderC r m a) -> ReaderC r m a

(Carrier sig m, Effect sig, Monad m) => Carrier (Error e :+: sig) (ErrorC e m)

Defined in Control.Effect.Error

Methods

ret :: a -> ErrorC e m a

eff :: (Error e :+: sig) (ErrorC e m) (ErrorC e m a) -> ErrorC e m a

(Monoid w, Carrier sig m, Effect sig, Functor m) => Carrier (Writer w :+: sig) (WriterC w m)

Defined in Control.Effect.Writer

Methods

ret :: a -> WriterC w m a

eff :: (Writer w :+: sig) (WriterC w m) (WriterC w m a) -> WriterC w m a

(Functor (f m), Functor (g m)) => Functor ((f :+: g) m)

Defined in Control.Effect.Sum

Methods

fmap :: (a -> b) -> (f :+: g) m a -> (f :+: g) m b

(<$) :: a -> (f :+: g) m b -> (f :+: g) m a

(Eq (f m k), Eq (g m k)) => Eq ((f :+: g) m k)

Defined in Control.Effect.Sum

Methods

(==) :: (f :+: g) m k -> (f :+: g) m k -> Bool

(/=) :: (f :+: g) m k -> (f :+: g) m k -> Bool

(Ord (f m k), Ord (g m k)) => Ord ((f :+: g) m k)

Defined in Control.Effect.Sum

Methods

compare :: (f :+: g) m k -> (f :+: g) m k -> Ordering

(<) :: (f :+: g) m k -> (f :+: g) m k -> Bool

(<=) :: (f :+: g) m k -> (f :+: g) m k -> Bool

(>) :: (f :+: g) m k -> (f :+: g) m k -> Bool

(>=) :: (f :+: g) m k -> (f :+: g) m k -> Bool

max :: (f :+: g) m k -> (f :+: g) m k -> (f :+: g) m k

min :: (f :+: g) m k -> (f :+: g) m k -> (f :+: g) m k

(Show (f m k), Show (g m k)) => Show ((f :+: g) m k)

Defined in Control.Effect.Sum

Methods

showsPrec :: Int -> (f :+: g) m k -> ShowS

show :: (f :+: g) m k -> String

showList :: [(f :+: g) m k] -> ShowS

handleSum :: (sig2 m a -> b) -> (sig1 m a -> b) -> (sig1 :+: sig2) m a -> b

Lift algebras for either side of a sum into a single algebra on sums.

Note that the order of the functions is the opposite of members of the sum. This is more convenient for defining effect handlers as lambdas (especially using -XLambdaCase) on the right, enabling better error messaging when using typed holes than would be the case with a binding in a where clause.

class Member (sub :: (* -> *) -> * -> *) sup where

Minimal complete definition

inj, prj

Methods

inj :: sub m a -> sup m a

prj :: sup m a -> Maybe (sub m a)

Instances

Member sub sub

Defined in Control.Effect.Sum

Methods

inj :: sub m a -> sub m a

prj :: sub m a -> Maybe (sub m a)

Member sub sup => Member sub (sub' :+: sup)

Defined in Control.Effect.Sum

Methods

inj :: sub m a -> (sub' :+: sup) m a

prj :: (sub' :+: sup) m a -> Maybe (sub m a)

Member sub (sub :+: sup)

Defined in Control.Effect.Sum

Methods

inj :: sub m a -> (sub :+: sup) m a

prj :: (sub :+: sup) m a -> Maybe (sub m a)

send :: (Member effect sig, Carrier sig m) => effect m (m a) -> m a

Construct a request for an effect to be interpreted by some handler later on.