Safe Haskell	None
Language	Haskell2010

Control.Carrier.Error.Church

Contents

Error carrier
Error effect

Description

A church-encoded carrier for Error.

Since: 1.1.0.0

Synopsis

runError :: (e -> m b) -> (a -> m b) -> ErrorC e m a -> m b
newtype ErrorC e m a = ErrorC {
- runErrorC :: forall b. (e -> m b) -> (a -> m b) -> m b
}
module Control.Effect.Error

Error carrier

runError :: (e -> m b) -> (a -> m b) -> ErrorC e m a -> m b Source #

Run an Error effect, applying the first continuation to uncaught errors and the second continuation to successful computations’ results.

runError j k (pure a) = k a

runError j k (throwError e) = j e

runError j k (throwError e `catchError` pure) = k e

Since: 1.1.0.0

newtype ErrorC e m a Source #

Since: 1.1.0.0

Constructors

ErrorC
Fields runErrorC :: forall b. (e -> m b) -> (a -> m b) -> m b

Instances

Instances details

MonadTrans (ErrorC e) Source #
Instance details Defined in Control.Carrier.Error.Church Methods lift :: Monad m => m a -> ErrorC e m a #
Monad (ErrorC e m) Source #
Instance details Defined in Control.Carrier.Error.Church 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 (ErrorC e m) Source #
Instance details Defined in Control.Carrier.Error.Church 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.Church 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.Church Methods fail :: String -> ErrorC e m a #
Applicative (ErrorC e m) Source #
Instance details Defined in Control.Carrier.Error.Church 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.Church Methods liftIO :: IO a -> ErrorC e m a #
Alternative m => Alternative (ErrorC e m) Source #
Instance details Defined in Control.Carrier.Error.Church 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 #
Instance details Defined in Control.Carrier.Error.Church 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.Church 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