Control.Carrier.Error.Either

A carrier for an Error effect.

Since: 1.0.0.0

Error carrier

runError :: ErrorC exc m a -> m (Either exc a)

Run an Error effect, returning uncaught errors in Left and successful computations’ values in Right.

runError (pure a) = pure (Right a)

runError (throwError e) = pure (Left e)

runError (throwError e `catchError` pure) = pure (Right e)

Since: 0.1.0.0

newtype ErrorC e (m :: Type -> Type) a

Since: 0.1.0.0

Constructors

ErrorC (ExceptT e m a)

Instances

MonadTrans (ErrorC e)

Defined in Control.Carrier.Error.Either

Methods

lift :: Monad m => m a -> ErrorC e m a

(Alternative m, Monad m) => Alternative (ErrorC e m)

ErrorC passes Alternative operations along to the underlying monad m, rather than combining errors à la ExceptT.

Defined in Control.Carrier.Error.Either

Methods

empty :: ErrorC e m a

(<|>) :: ErrorC e m a -> ErrorC e m a -> ErrorC e m a

some :: ErrorC e m a -> ErrorC e m [a]

many :: ErrorC e m a -> ErrorC e m [a]

Monad m => Applicative (ErrorC e m)

Defined in Control.Carrier.Error.Either

Methods

pure :: a -> ErrorC e m a

(<*>) :: ErrorC e m (a -> b) -> ErrorC e m a -> ErrorC e m b

liftA2 :: (a -> b -> c) -> ErrorC e m a -> ErrorC e m b -> ErrorC e m c

(*>) :: ErrorC e m a -> ErrorC e m b -> ErrorC e m b

(<*) :: ErrorC e m a -> ErrorC e m b -> ErrorC e m a

Functor m => Functor (ErrorC e m)

Defined in Control.Carrier.Error.Either

Methods

fmap :: (a -> b) -> ErrorC e m a -> ErrorC e m b

(<$) :: a -> ErrorC e m b -> ErrorC e m a

Monad m => Monad (ErrorC e m)

Defined in Control.Carrier.Error.Either

Methods

(>>=) :: ErrorC e m a -> (a -> ErrorC e m b) -> ErrorC e m b

(>>) :: ErrorC e m a -> ErrorC e m b -> ErrorC e m b

return :: a -> ErrorC e m a

(Alternative m, Monad m) => MonadPlus (ErrorC e m)

ErrorC passes MonadPlus operations along to the underlying monad m, rather than combining errors à la ExceptT.

Defined in Control.Carrier.Error.Either

Methods

mzero :: ErrorC e m a

mplus :: ErrorC e m a -> ErrorC e m a -> ErrorC e m a

MonadFail m => MonadFail (ErrorC e m)

Defined in Control.Carrier.Error.Either

Methods

fail :: String -> ErrorC e m a

MonadFix m => MonadFix (ErrorC e m)

Defined in Control.Carrier.Error.Either

Methods

mfix :: (a -> ErrorC e m a) -> ErrorC e m a

MonadIO m => MonadIO (ErrorC e m)

Defined in Control.Carrier.Error.Either

Methods

liftIO :: IO a -> ErrorC e m a

Algebra sig m => Algebra (Error e :+: sig) (ErrorC e m)

Defined in Control.Carrier.Error.Either

Methods

alg :: forall ctx (n :: Type -> Type) a. Functor ctx => Handler ctx n (ErrorC e m) -> (Error e :+: sig) n a -> ctx () -> ErrorC e m (ctx a)

Error effect

module Control.Effect.Error