shithub: MicroHs

ref: b993c2b768d19487579fecc2dd202a337b4f2945
dir: /lib/Data/Functor/Identity.hs/

View raw version 
-- Copyright 2023 Lennart Augustsson
-- See LICENSE file for full license.
module Data.Functor.Identity(Identity(..), runIdentity) where
import Primitives
import Control.Applicative
import Control.Monad
import Data.Bool
import Data.Eq
import Data.Function
import Data.Functor
import Data.Int
import Data.Ord
import Text.Show

newtype Identity a = Identity a
  deriving (Eq, Ord, Show)

runIdentity :: forall a . Identity a -> a
runIdentity (Identity a) = a

instance Functor Identity where
  fmap f (Identity a) = Identity (f a)

instance Applicative Identity where
  pure a = Identity a
  Identity f <*> Identity a = Identity (f a)

instance Monad Identity where
  Identity a >>= f = f a