shithub: MicroHs

ref: a5ca009ee1a1edac5a5c70a163ae1f1d6a269bd9
dir: /lib/Data/Either.hs/

View raw version 
-- Copyright 2023 Lennart Augustsson
-- See LICENSE file for full license.
module Data.Either(module Data.Either) where
import Primitives
import Data.Bool
import Data.Eq

data Either a b = Left a | Right b

instance forall a b . (Eq a, Eq b) => Eq (Either a b) where
  Left  a == Left  a'  =  a == a'
  Right b == Right b'  =  b == b'
  _       == _         =  False

either :: forall a b r . (a -> r) -> (b -> r) -> Either a b -> r
either f _ (Left  a) = f a
either _ f (Right b) = f b