either-4.4.1.1: An either monad transformer

Copyright(c) 2014 Chris Allen, Edward Kmett
LicenseBSD-style
Maintainerekmett@gmail.com
Stabilityprovisional
Portabilityportable
Safe HaskellSafe
LanguageHaskell98

Data.Either.Validation

Description

Monoidal Validation sibling to Either.

Synopsis

Documentation

data Validation e a Source #

Validation is Either with a Left that is a Monoid

Constructors

Failure e 
Success a 

Instances

Bifunctor Validation Source # 

Methods

bimap :: (a -> b) -> (c -> d) -> Validation a c -> Validation b d #

first :: (a -> b) -> Validation a c -> Validation b c #

second :: (b -> c) -> Validation a b -> Validation a c #

Bifoldable Validation Source # 

Methods

bifold :: Monoid m => Validation m m -> m

bifoldMap :: Monoid m => (a -> m) -> (b -> m) -> Validation a b -> m

bifoldr :: (a -> c -> c) -> (b -> c -> c) -> c -> Validation a b -> c

bifoldl :: (c -> a -> c) -> (c -> b -> c) -> c -> Validation a b -> c

Bitraversable Validation Source # 

Methods

bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> Validation a b -> f (Validation c d)

Functor (Validation e) Source # 

Methods

fmap :: (a -> b) -> Validation e a -> Validation e b #

(<$) :: a -> Validation e b -> Validation e a #

Semigroup e => Applicative (Validation e) Source # 

Methods

pure :: a -> Validation e a #

(<*>) :: Validation e (a -> b) -> Validation e a -> Validation e b #

(*>) :: Validation e a -> Validation e b -> Validation e b #

(<*) :: Validation e a -> Validation e b -> Validation e a #

Foldable (Validation e) Source # 

Methods

fold :: Monoid m => Validation e m -> m #

foldMap :: Monoid m => (a -> m) -> Validation e a -> m #

foldr :: (a -> b -> b) -> b -> Validation e a -> b #

foldr' :: (a -> b -> b) -> b -> Validation e a -> b #

foldl :: (b -> a -> b) -> b -> Validation e a -> b #

foldl' :: (b -> a -> b) -> b -> Validation e a -> b #

foldr1 :: (a -> a -> a) -> Validation e a -> a #

foldl1 :: (a -> a -> a) -> Validation e a -> a #

toList :: Validation e a -> [a] #

null :: Validation e a -> Bool #

length :: Validation e a -> Int #

elem :: Eq a => a -> Validation e a -> Bool #

maximum :: Ord a => Validation e a -> a #

minimum :: Ord a => Validation e a -> a #

sum :: Num a => Validation e a -> a #

product :: Num a => Validation e a -> a #

Traversable (Validation e) Source # 

Methods

traverse :: Applicative f => (a -> f b) -> Validation e a -> f (Validation e b) #

sequenceA :: Applicative f => Validation e (f a) -> f (Validation e a) #

mapM :: Monad m => (a -> m b) -> Validation e a -> m (Validation e b) #

sequence :: Monad m => Validation e (m a) -> m (Validation e a) #

(Semigroup e, Monoid e) => Alternative (Validation e) Source # 

Methods

empty :: Validation e a #

(<|>) :: Validation e a -> Validation e a -> Validation e a #

some :: Validation e a -> Validation e [a] #

many :: Validation e a -> Validation e [a] #

Alt (Validation e) Source # 

Methods

(<!>) :: Validation e a -> Validation e a -> Validation e a

some :: Applicative (Validation e) => Validation e a -> Validation e [a]

many :: Applicative (Validation e) => Validation e a -> Validation e [a]

(Eq e, Eq a) => Eq (Validation e a) Source # 

Methods

(==) :: Validation e a -> Validation e a -> Bool #

(/=) :: Validation e a -> Validation e a -> Bool #

(Ord e, Ord a) => Ord (Validation e a) Source # 

Methods

compare :: Validation e a -> Validation e a -> Ordering #

(<) :: Validation e a -> Validation e a -> Bool #

(<=) :: Validation e a -> Validation e a -> Bool #

(>) :: Validation e a -> Validation e a -> Bool #

(>=) :: Validation e a -> Validation e a -> Bool #

max :: Validation e a -> Validation e a -> Validation e a #

min :: Validation e a -> Validation e a -> Validation e a #

(Show e, Show a) => Show (Validation e a) Source # 

Methods

showsPrec :: Int -> Validation e a -> ShowS #

show :: Validation e a -> String #

showList :: [Validation e a] -> ShowS #

Semigroup e => Semigroup (Validation e a) Source # 

Methods

(<>) :: Validation e a -> Validation e a -> Validation e a #

sconcat :: NonEmpty (Validation e a) -> Validation e a #

stimes :: Integral b => b -> Validation e a -> Validation e a #

Monoid e => Monoid (Validation e a) Source # 

Methods

mempty :: Validation e a #

mappend :: Validation e a -> Validation e a -> Validation e a #

mconcat :: [Validation e a] -> Validation e a #

_Success :: Prism (Validation c a) (Validation c b) a b Source #

_Failure :: Prism (Validation a c) (Validation b c) a b Source #

_Validation :: Iso (Validation e a) (Validation g b) (Either e a) (Either g b) Source #

Validation is isomorphic to Either