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comparison similer.hs @ 1:878d1e271709

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Force Implement mu
author Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp>
date Sun, 31 Aug 2014 18:35:10 +0900
parents 7a82a5e50499
children a5210ec1e41b
comparison
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0:7a82a5e50499 1:878d1e271709
1 {-# LANGUAGE FlexibleContexts #-}
1 data Similer a f b = Similer a (a -> b) b 2 data Similer a f b = Similer a (a -> b) b
2 3
3 instance Functor (Similer a f) where 4 instance Functor (Similer a f) where
4 fmap g (Similer a f b) = Similer a (g . f) $ g b 5 fmap g (Similer a f b) = Similer a (g . f) $ g b
5 6
6 eta :: a -> Similer a (a -> a) a 7 eta :: a -> Similer a (a -> a) a
7 eta a = Similer a id a 8 eta a = Similer a id a
8 9
9 --mu :: (Eq a, Eq b, Eq c) => Similer a (a -> b) (Similer b (b -> c) c) -> Similer b (b -> c) c 10 --mu :: (Eq (Similer b (b -> c) c)) => Similer a (a -> (Similer b (b -> c) c)) (Similer b (b -> c) c) -> Similer b (b -> c) c
10 --mu (Similer a f (Similer b g c)) = if ((f a) == b) then Similer b g c else undefined 11 mu :: (Eq (Similer b (b -> c) c)) => Similer a (a -> (Similer b (b -> c) c)) (Similer b (b -> c) c) -> Similer b (b -> c) c
11 --mu (Similer a f (Similer b g c)) = if ((f a) == b) then Similer b g c else undefined 12 mu (Similer a f b) = if ((f a) == b) then b else undefined