Copyright	(c) Owen Shepherd 2021
License	MIT
Maintainer	owen@owen.cafe
Stability	stable
Portability	portable
Safe Haskell	None
Language	Haskell2010

Control.Applicative.MultiExcept

Description

Synopsis

data MultiExcept err a
fromEither :: Either err a -> MultiExcept err a
fromEitherPoly :: Either (NonEmptyDList err) a -> MultiExcept err a
join :: MultiExcept err (MultiExcept err a) -> MultiExcept err a
runMultiExcept :: MultiExcept err a -> Either (NonEmptyDList err) a
succeed :: forall err a. a -> MultiExcept err a
throwError :: forall a err. err -> MultiExcept err a
throwErrors :: forall a err. NonEmptyDList err -> MultiExcept err a

Documentation

data MultiExcept err a Source #

A MultiExcept is a success value, or one or more errors.

Instances

Instances details

Bifunctor MultiExcept Source #
Instance details Defined in Control.Applicative.MultiExcept Methods bimap :: (a -> b) -> (c -> d) -> MultiExcept a c -> MultiExcept b d # first :: (a -> b) -> MultiExcept a c -> MultiExcept b c # second :: (b -> c) -> MultiExcept a b -> MultiExcept a c #
Functor (MultiExcept err) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods fmap :: (a -> b) -> MultiExcept err a -> MultiExcept err b # (<$) :: a -> MultiExcept err b -> MultiExcept err a #
Applicative (MultiExcept err) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods pure :: a -> MultiExcept err a # (<>) :: MultiExcept err (a -> b) -> MultiExcept err a -> MultiExcept err b # liftA2 :: (a -> b -> c) -> MultiExcept err a -> MultiExcept err b -> MultiExcept err c # (>) :: MultiExcept err a -> MultiExcept err b -> MultiExcept err b # (<*) :: MultiExcept err a -> MultiExcept err b -> MultiExcept err a #
Foldable (MultiExcept err) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods fold :: Monoid m => MultiExcept err m -> m # foldMap :: Monoid m => (a -> m) -> MultiExcept err a -> m # foldMap' :: Monoid m => (a -> m) -> MultiExcept err a -> m # foldr :: (a -> b -> b) -> b -> MultiExcept err a -> b # foldr' :: (a -> b -> b) -> b -> MultiExcept err a -> b # foldl :: (b -> a -> b) -> b -> MultiExcept err a -> b # foldl' :: (b -> a -> b) -> b -> MultiExcept err a -> b # foldr1 :: (a -> a -> a) -> MultiExcept err a -> a # foldl1 :: (a -> a -> a) -> MultiExcept err a -> a # toList :: MultiExcept err a -> [a] # null :: MultiExcept err a -> Bool # length :: MultiExcept err a -> Int # elem :: Eq a => a -> MultiExcept err a -> Bool # maximum :: Ord a => MultiExcept err a -> a # minimum :: Ord a => MultiExcept err a -> a # sum :: Num a => MultiExcept err a -> a # product :: Num a => MultiExcept err a -> a #
Traversable (MultiExcept err) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods traverse :: Applicative f => (a -> f b) -> MultiExcept err a -> f (MultiExcept err b) # sequenceA :: Applicative f => MultiExcept err (f a) -> f (MultiExcept err a) # mapM :: Monad m => (a -> m b) -> MultiExcept err a -> m (MultiExcept err b) # sequence :: Monad m => MultiExcept err (m a) -> m (MultiExcept err a) #
Alt (MultiExcept err) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods (<!>) :: MultiExcept err a -> MultiExcept err a -> MultiExcept err a # some :: Applicative (MultiExcept err) => MultiExcept err a -> MultiExcept err [a] # many :: Applicative (MultiExcept err) => MultiExcept err a -> MultiExcept err [a] #
(Eq a, Eq err) => Eq (MultiExcept err a) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods (==) :: MultiExcept err a -> MultiExcept err a -> Bool # (/=) :: MultiExcept err a -> MultiExcept err a -> Bool #
(Ord a, Ord err) => Ord (MultiExcept err a) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods compare :: MultiExcept err a -> MultiExcept err a -> Ordering # (<) :: MultiExcept err a -> MultiExcept err a -> Bool # (<=) :: MultiExcept err a -> MultiExcept err a -> Bool # (>) :: MultiExcept err a -> MultiExcept err a -> Bool # (>=) :: MultiExcept err a -> MultiExcept err a -> Bool # max :: MultiExcept err a -> MultiExcept err a -> MultiExcept err a # min :: MultiExcept err a -> MultiExcept err a -> MultiExcept err a #
(Read a, Read err) => Read (MultiExcept err a) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods readsPrec :: Int -> ReadS (MultiExcept err a) # readList :: ReadS [MultiExcept err a] # readPrec :: ReadPrec (MultiExcept err a) # readListPrec :: ReadPrec [MultiExcept err a] #
(Show a, Show err) => Show (MultiExcept err a) Source #
Instance details Defined in Control.Applicative.MultiExcept Methods showsPrec :: Int -> MultiExcept err a -> ShowS # show :: MultiExcept err a -> String # showList :: [MultiExcept err a] -> ShowS #

fromEither :: Either err a -> MultiExcept err a Source #

Convert an Either to a MultiExcept.

fromEitherPoly :: Either (NonEmptyDList err) a -> MultiExcept err a Source #

Convert a multi-error Either to a MultiExcept.

join :: MultiExcept err (MultiExcept err a) -> MultiExcept err a Source #

Join nested MultiExcepts with the same error type. Note that this doesn't imply a useful Monad instance. The instance defined in terms of join discards errors on the RHS of >>=.

runMultiExcept :: MultiExcept err a -> Either (NonEmptyDList err) a Source #

Run the computation.

succeed :: forall err a. a -> MultiExcept err a Source #

Embeds a value into a MultiExcept context.

throwError :: forall a err. err -> MultiExcept err a Source #

Throw a single error.

throwErrors :: forall a err. NonEmptyDList err -> MultiExcept err a Source #

Throw one or more errors.