Created
February 14, 2015 07:01
-
-
Save aavogt/f64db5678181307bebb9 to your computer and use it in GitHub Desktop.
CanMap
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
{-# LANGUAGE OverlappingInstances #-} | |
{-# LANGUAGE FunctionalDependencies #-} | |
{-# LANGUAGE FlexibleInstances #-} | |
{-# LANGUAGE MultiParamTypeClasses #-} | |
{-# LANGUAGE TypeFamilies #-} | |
module Main where | |
import Prelude hiding (map) | |
import qualified Data.Text as T | |
import qualified Data.Vector.Unboxed as U | |
import Data.Char as C | |
import Control.Monad (Functor) | |
class CanMap ca cb a b | ca -> a, cb -> b, cb a -> ca, ca b -> cb where | |
map :: (a -> b) -> ca -> cb | |
instance CanMap T.Text T.Text Char Char where | |
map = T.map | |
instance Functor f => CanMap (f a) (f b) a b where | |
map = fmap | |
instance (U.Unbox a, U.Unbox b) => CanMap (U.Vector a) (U.Vector b) a b where | |
map = U.map | |
main = do | |
let l = [1,2,3] :: [Int] | |
let m = Just 5 | |
let t = (T.pack "Hello") | |
v = U.fromList [1,2,3] | |
print $ map (*2) l | |
print $ map (*2) m | |
print $ map C.toUpper t | |
print $ map (fromIntegral :: Int -> Double) v | |
return () |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment