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changeset 0:7a82a5e50499

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Initial commit. define to Functor for Similer
author Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp>
date Sun, 31 Aug 2014 16:48:45 +0900
parents
children 878d1e271709
files similer.hs
diffstat 1 files changed, 11 insertions(+), 0 deletions(-) [+]
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line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/similer.hs	Sun Aug 31 16:48:45 2014 +0900
@@ -0,0 +1,11 @@
+data Similer a f b = Similer a (a -> b) b
+
+instance Functor (Similer a f) where
+  fmap g (Similer a f b) = Similer a (g . f) $ g b
+
+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