Safe Haskell	None
Language	Haskell2010

Control.Carrier.Error.Either

Contents

Error carrier
Error effect

Description

A carrier for an Error effect.

Since: 1.0.0.0

Synopsis

runError :: ErrorC exc m a -> m (Either exc a)
newtype ErrorC e m a = ErrorC (ExceptT e m a)
module Control.Effect.Error

Error carrier

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

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 a Source #

Since: 0.1.0.0

Constructors

ErrorC (ExceptT e m a)

Instances

Instances details

MonadTrans (ErrorC e) Source #
Instance details Defined in Control.Carrier.Error.Either Methods lift :: Monad m => m a -> ErrorC e m a #
Monad m => Monad (ErrorC e m) Source #
Instance details 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 #
Functor m => Functor (ErrorC e m) Source #
Instance details 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 #
MonadFix m => MonadFix (ErrorC e m) Source #
Instance details Defined in Control.Carrier.Error.Either Methods mfix :: (a -> ErrorC e m a) -> ErrorC e m a #
MonadFail m => MonadFail (ErrorC e m) Source #
Instance details Defined in Control.Carrier.Error.Either Methods fail :: String -> ErrorC e m a #
Monad m => Applicative (ErrorC e m) Source #
Instance details 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 #
MonadIO m => MonadIO (ErrorC e m) Source #
Instance details Defined in Control.Carrier.Error.Either Methods liftIO :: IO a -> ErrorC e m a #
(Alternative m, Monad m) => Alternative (ErrorC e m) Source #	`ErrorC` passes `Alternative` operations along to the underlying monad `m`, rather than combining errors à la `ExceptT`.
Instance details 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] #
(Alternative m, Monad m) => MonadPlus (ErrorC e m) Source #	`ErrorC` passes `MonadPlus` operations along to the underlying monad `m`, rather than combining errors à la `ExceptT`.
Instance details 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 #
Algebra sig m => Algebra (Error e :+: sig) (ErrorC e m) Source #
Instance details 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) Source #

Error effect

module Control.Effect.Error