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changeset 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
files similer.hs
diffstat 1 files changed, 4 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/similer.hs	Sun Aug 31 16:48:45 2014 +0900
+++ b/similer.hs	Sun Aug 31 18:35:10 2014 +0900
@@ -1,3 +1,4 @@
+{-# LANGUAGE FlexibleContexts #-}
 data Similer a f b = Similer a (a -> b) b
 
 instance Functor (Similer a f) where
@@ -6,6 +7,6 @@
 eta :: a -> Similer a (a -> a) a
 eta a = Similer a id a
 
---mu :: (Eq a, Eq b, Eq c) => Similer a (a -> b) (Similer b (b -> c) c) -> Similer b (b -> c) c
---mu (Similer a f (Similer b g c)) = if ((f a) == b) then Similer b g c else undefined
---mu (Similer a f (Similer b g c)) = if ((f a) == b) then Similer b g c else undefined
+--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
+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
+mu (Similer a f b) = if ((f a) == b) then b else undefined