Safe Haskell	None
Language	Haskell2010

Control.Effect.Type.Split

Synopsis

data Split m a where
- Split :: (Maybe (a, m a) -> b) -> m a -> Split m b

Documentation

data Split m a where Source #

An effect for spliting a nondeterministic computation into its head and tail.

Split is typically used as a primitive effect. If you define a Carrier that relies on a novel non-trivial monad transformer, then you need to make a ThreadsEff instance for that monad transformer to lift Split (if possible).

The following threading constraints accept Split:

Constructors

Split :: (Maybe (a, m a) -> b) -> m a -> Split m b

Instances

Monoid s => ThreadsEff (WriterT s) Split Source #
Instance details Defined in Control.Effect.Type.Split Methods threadEff :: Monad m => (forall x. Split m x -> m x) -> Split (WriterT s m) a -> WriterT s m a Source #
ThreadsEff (StateT s) Split Source #
Instance details Defined in Control.Effect.Type.Split Methods threadEff :: Monad m => (forall x. Split m x -> m x) -> Split (StateT s m) a -> StateT s m a Source #
ThreadsEff (ReaderT s) Split Source #
Instance details Defined in Control.Effect.Type.Split Methods threadEff :: Monad m => (forall x. Split m x -> m x) -> Split (ReaderT s m) a -> ReaderT s m a Source #
ThreadsEff (StateT s) Split Source #
Instance details Defined in Control.Effect.Type.Split Methods threadEff :: Monad m => (forall x. Split m x -> m x) -> Split (StateT s m) a -> StateT s m a Source #
Monoid s => ThreadsEff (WriterT s) Split Source #
Instance details Defined in Control.Effect.Type.Split Methods threadEff :: Monad m => (forall x. Split m x -> m x) -> Split (WriterT s m) a -> WriterT s m a Source #
Monoid s => ThreadsEff (WriterT s) Split Source #
Instance details Defined in Control.Effect.Type.Split Methods threadEff :: Monad m => (forall x. Split m x -> m x) -> Split (WriterT s m) a -> WriterT s m a Source #