### changeset 12:158ae705cd16

Rename Similer -> Similar
author Yasutaka Higa Tue, 02 Sep 2014 16:59:52 +0900 e8a5df54480e 88d6897c391a similar.hs similer.hs 2 files changed, 55 insertions(+), 54 deletions(-) [+]
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```--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/similar.hs	Tue Sep 02 16:59:52 2014 +0900
@@ -0,0 +1,55 @@
+
+data Similar a = (Eq a) => Similar a (a -> a) a
+
+instance (Eq a) => Eq (Similar a) where
+  s == ss = same s == same ss
+
+same :: (Eq a) => Similar a -> a
+same (Similar x f y) = if (f x) == y then y else undefined
+
+mu :: (Eq a) => Similar (Similar a) -> Similar a
+mu (Similar a f b) = if ((f a) == b) then b else undefined
+
+class EqFunctor f where
+  eqmap :: (Eq a, Eq b) => (a -> b) -> f a -> f b
+
+instance EqFunctor Similar where
+  eqmap f s = Similar fs id fs
+    where fs = f \$ same s
+
+  (>>=) :: (Eq a, Eq b) => m a -> (a -> m b) -> m b
+  return ::(Eq a) =>  a -> m a
+
+  return x = Similar x id x
+  s >>= f  = mu (eqmap f s)
+
+similar :: (Eq a) => (a -> a) -> (a -> a) -> a -> a
+similar f g x = same \$ Similar x g (f x)
+
+
+
+double :: Int -> Int
+double x = (2 * x)
+
+twicePlus :: Int -> Int
+twicePlus x = x + x
+
+plusTwo :: Int -> Int
+plusTwo x = x + 2
+
+-- samples
+
+{-
+*Main> same \$ Main.return 100 Main.>>= (\x -> Similar x twicePlus  \$ double x)
+200
+
+*Main> same \$ Main.return 2 Main.>>= (\x -> Similar x plusTwo \$ double x)
+4
+
+*Main> same \$ Main.return 100 Main.>>= (\x -> Similar x plusTwo \$ double x)
+*** Exception: Prelude.undefined
+-}
+```
```--- a/similer.hs	Tue Sep 02 16:25:53 2014 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,54 +0,0 @@
-
-data Similer a = (Eq a) => Similer a (a -> a) a
-
-instance (Eq a) => Eq (Similer a) where
-  s == ss = same s == same ss
-
-same :: (Eq a) => Similer a -> a
-same (Similer x f y) = if (f x) == y then y else undefined
-
-mu :: (Eq a) => Similer (Similer a) -> Similer a
-mu (Similer a f b) = if ((f a) == b) then b else undefined
-
-class EqFunctor f where
-  eqmap :: (Eq a, Eq b) => (a -> b) -> f a -> f b
-
-instance EqFunctor Similer where
-  eqmap f s = Similer fs id fs
-    where fs = f \$ same s
-
-  (>>=) :: (Eq a, Eq b) => m a -> (a -> m b) -> m b
-  return ::(Eq a) =>  a -> m a
-
-  return x = Similer x id x
-  s >>= f  = mu (eqmap f s)
-
-similer :: (Eq a) => (a -> a) -> (a -> a) -> a -> a
-similer f g x = same \$ Similer x g (f x)
-
-
-
-double :: Int -> Int
-double x = (2 * x)
-
-twicePlus :: Int -> Int
-twicePlus x = x + x
-
-plusTwo :: Int -> Int
-plusTwo x = x + 2
-
--- samples
-
-{-
-*Main> same \$ Main.return 100 Main.>>= (\x -> Similer x twicePlus  \$ double x)
-200
-
-*Main> same \$ Main.return 2 Main.>>= (\x -> Similer x plusTwo \$ double x)
-4
-
-*Main> same \$ Main.return 100 Main.>>= (\x -> Similer x plusTwo \$ double x)
-*** Exception: Prelude.undefined
--}```