Data.Strict.Either

The strict variant of the standard Haskell Either type and the corresponding variants of the functions from Data.Either.

Note that the strict Either type is not an applicative functor, and therefore also no monad. The reasons are the same as the ones for the strict Maybe type, which are explained in Data.Maybe.Strict.

Documentation

data Either a b

The strict choice type.

Constructors

Left !a

Right !b

Instances

Bifunctor Either

Defined in Data.Strict.Either

Methods

bimap :: (a -> b) -> (c -> d) -> Either a c -> Either b d

first :: (a -> b) -> Either a c -> Either b c

second :: (b -> c) -> Either a b -> Either a c

Swap Either

Defined in Data.Strict.Either

Methods

swap :: Either a b -> Either b a

Assoc Either

Defined in Data.Strict.Either

Methods

assoc :: Either (Either a b) c -> Either a (Either b c)

unassoc :: Either a (Either b c) -> Either (Either a b) c

Bitraversable Either

Defined in Data.Strict.Either

Methods

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

Bifoldable Either

Defined in Data.Strict.Either

Methods

bifold :: Monoid m => Either m m -> m

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

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

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

Eq2 Either

Defined in Data.Strict.Either

Methods

liftEq2 :: (a -> b -> Bool) -> (c -> d -> Bool) -> Either a c -> Either b d -> Bool

Ord2 Either

Defined in Data.Strict.Either

Methods

liftCompare2 :: (a -> b -> Ordering) -> (c -> d -> Ordering) -> Either a c -> Either b d -> Ordering

Read2 Either

Defined in Data.Strict.Either

Methods

liftReadsPrec2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> Int -> ReadS (Either a b)

liftReadList2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> ReadS [Either a b]

liftReadPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec (Either a b)

liftReadListPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec [Either a b]

Show2 Either

Defined in Data.Strict.Either

Methods

liftShowsPrec2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> Int -> Either a b -> ShowS

liftShowList2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> [Either a b] -> ShowS

NFData2 Either

Defined in Data.Strict.Either

Methods

liftRnf2 :: (a -> ()) -> (b -> ()) -> Either a b -> ()

Hashable2 Either

Defined in Data.Strict.Either

Methods

liftHashWithSalt2 :: (Int -> a -> Int) -> (Int -> b -> Int) -> Int -> Either a b -> Int

Functor (Either a)

Defined in Data.Strict.Either

Methods

fmap :: (a0 -> b) -> Either a a0 -> Either a b

(<$) :: a0 -> Either a b -> Either a a0

Foldable (Either e)

Defined in Data.Strict.Either

Methods

fold :: Monoid m => Either e m -> m

foldMap :: Monoid m => (a -> m) -> Either e a -> m

foldMap' :: Monoid m => (a -> m) -> Either e a -> m

foldr :: (a -> b -> b) -> b -> Either e a -> b

foldr' :: (a -> b -> b) -> b -> Either e a -> b

foldl :: (b -> a -> b) -> b -> Either e a -> b

foldl' :: (b -> a -> b) -> b -> Either e a -> b

foldr1 :: (a -> a -> a) -> Either e a -> a

foldl1 :: (a -> a -> a) -> Either e a -> a

toList :: Either e a -> [a]

null :: Either e a -> Bool

length :: Either e a -> Int

elem :: Eq a => a -> Either e a -> Bool

maximum :: Ord a => Either e a -> a

minimum :: Ord a => Either e a -> a

sum :: Num a => Either e a -> a

product :: Num a => Either e a -> a

Traversable (Either e)

Defined in Data.Strict.Either

Methods

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

sequenceA :: Applicative f => Either e (f a) -> f (Either e a)

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

sequence :: Monad m => Either e (m a) -> m (Either e a)

Eq a => Eq1 (Either a)

Defined in Data.Strict.Either

Methods

liftEq :: (a0 -> b -> Bool) -> Either a a0 -> Either a b -> Bool

Ord a => Ord1 (Either a)

Defined in Data.Strict.Either

Methods

liftCompare :: (a0 -> b -> Ordering) -> Either a a0 -> Either a b -> Ordering

Read a => Read1 (Either a)

Defined in Data.Strict.Either

Methods

liftReadsPrec :: (Int -> ReadS a0) -> ReadS [a0] -> Int -> ReadS (Either a a0)

liftReadList :: (Int -> ReadS a0) -> ReadS [a0] -> ReadS [Either a a0]

liftReadPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec (Either a a0)

liftReadListPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec [Either a a0]

Show a => Show1 (Either a)

Defined in Data.Strict.Either

Methods

liftShowsPrec :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> Int -> Either a a0 -> ShowS

liftShowList :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> [Either a a0] -> ShowS

NFData a => NFData1 (Either a)

Defined in Data.Strict.Either

Methods

liftRnf :: (a0 -> ()) -> Either a a0 -> ()

Hashable a => Hashable1 (Either a)

Defined in Data.Strict.Either

Methods

liftHashWithSalt :: (Int -> a0 -> Int) -> Int -> Either a a0 -> Int

Generic1 (Either a :: Type -> Type)

Defined in Data.Strict.Either

Associated Types

type Rep1 (Either a) :: k -> Type

Methods

from1 :: forall (a0 :: k). Either a a0 -> Rep1 (Either a) a0

to1 :: forall (a0 :: k). Rep1 (Either a) a0 -> Either a a0

(Eq a, Eq b) => Eq (Either a b)

Defined in Data.Strict.Either

Methods

(==) :: Either a b -> Either a b -> Bool

(/=) :: Either a b -> Either a b -> Bool

(Data a, Data b) => Data (Either a b)

Defined in Data.Strict.Either

Methods

gfoldl :: (forall d b0. Data d => c (d -> b0) -> d -> c b0) -> (forall g. g -> c g) -> Either a b -> c (Either a b)

gunfold :: (forall b0 r. Data b0 => c (b0 -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Either a b)

toConstr :: Either a b -> Constr

dataTypeOf :: Either a b -> DataType

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Either a b))

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Either a b))

gmapT :: (forall b0. Data b0 => b0 -> b0) -> Either a b -> Either a b

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Either a b -> r

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Either a b -> r

gmapQ :: (forall d. Data d => d -> u) -> Either a b -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> Either a b -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b)

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b)

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b)

(Ord a, Ord b) => Ord (Either a b)

Defined in Data.Strict.Either

Methods

compare :: Either a b -> Either a b -> Ordering

(<) :: Either a b -> Either a b -> Bool

(<=) :: Either a b -> Either a b -> Bool

(>) :: Either a b -> Either a b -> Bool

(>=) :: Either a b -> Either a b -> Bool

max :: Either a b -> Either a b -> Either a b

min :: Either a b -> Either a b -> Either a b

(Read a, Read b) => Read (Either a b)

Defined in Data.Strict.Either

Methods

readsPrec :: Int -> ReadS (Either a b)

readList :: ReadS [Either a b]

readPrec :: ReadPrec (Either a b)

readListPrec :: ReadPrec [Either a b]

(Show a, Show b) => Show (Either a b)

Defined in Data.Strict.Either

Methods

showsPrec :: Int -> Either a b -> ShowS

show :: Either a b -> String

showList :: [Either a b] -> ShowS

Generic (Either a b)

Defined in Data.Strict.Either

Associated Types

type Rep (Either a b) :: Type -> Type

Methods

from :: Either a b -> Rep (Either a b) x

to :: Rep (Either a b) x -> Either a b

Semigroup (Either a b)

Defined in Data.Strict.Either

Methods

(<>) :: Either a b -> Either a b -> Either a b

sconcat :: NonEmpty (Either a b) -> Either a b

stimes :: Integral b0 => b0 -> Either a b -> Either a b

(Binary a, Binary b) => Binary (Either a b)

Defined in Data.Strict.Either

Methods

put :: Either a b -> Put

get :: Get (Either a b)

putList :: [Either a b] -> Put

(NFData a, NFData b) => NFData (Either a b)

Defined in Data.Strict.Either

Methods

rnf :: Either a b -> ()

(Hashable a, Hashable b) => Hashable (Either a b)

Defined in Data.Strict.Either

Methods

hashWithSalt :: Int -> Either a b -> Int

hash :: Either a b -> Int

Strict (Either a b) (Either a b)

Defined in Data.Strict.Classes

Methods

toStrict :: Either0 a b -> Either a b

toLazy :: Either a b -> Either0 a b

type Rep1 (Either a :: Type -> Type)

Defined in Data.Strict.Either

type Rep1 (Either a :: Type -> Type) = D1 ('MetaData "Either" "Data.Strict.Either" "strict-0.4.0.1-4K2DPtw797H2vluacZeYr9" 'False) (C1 ('MetaCons "Left" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 a)) :+: C1 ('MetaCons "Right" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) Par1))

type Rep (Either a b)

Defined in Data.Strict.Either

type Rep (Either a b) = D1 ('MetaData "Either" "Data.Strict.Either" "strict-0.4.0.1-4K2DPtw797H2vluacZeYr9" 'False) (C1 ('MetaCons "Left" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 a)) :+: C1 ('MetaCons "Right" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 b)))

either :: (a -> c) -> (b -> c) -> Either a b -> c

Case analysis: if the value is Left a, apply the first function to a; if it is Right b, apply the second function to b.

isLeft :: Either a b -> Bool

Yields True iff the argument is of the form Left _.

isRight :: Either a b -> Bool

Yields True iff the argument is of the form Right _.

fromLeft :: Either a b -> a

Extracts the element out of a Left and throws an error if the argument is a Right.

fromRight :: Either a b -> b

Extracts the element out of a Right and throws an error if the argument is a Left.

lefts :: [Either a b] -> [a]

Analogous to lefts in Data.Either.

rights :: [Either a b] -> [b]

Analogous to rights in Data.Either.

partitionEithers :: [Either a b] -> ([a], [b])

Analogous to partitionEithers in Data.Either.