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annotate similer.hs @ 11:e8a5df54480e

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Define sample for Monad style
author Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp>
date Tue, 02 Sep 2014 16:25:53 +0900
parents 7c7efee7891f
children
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e8a5df54480e Define sample for Monad style
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1 {-# LANGUAGE GADTs #-}
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3 data Similer a = (Eq a) => Similer a (a -> a) a
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5 instance (Eq a) => Eq (Similer a) where
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6 s == ss = same s == same ss
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7
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8 same :: (Eq a) => Similer a -> a
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9 same (Similer x f y) = if (f x) == y then y else undefined
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11 mu :: (Eq a) => Similer (Similer a) -> Similer a
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12 mu (Similer a f b) = if ((f a) == b) then b else undefined
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14 class EqFunctor f where
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15 eqmap :: (Eq a, Eq b) => (a -> b) -> f a -> f b
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17 instance EqFunctor Similer where
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18 eqmap f s = Similer fs id fs
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19 where fs = f $ same s
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21 class EqMonad m where
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22 (>>=) :: (Eq a, Eq b) => m a -> (a -> m b) -> m b
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23 return ::(Eq a) => a -> m a
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25 instance EqMonad Similer where
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26 return x = Similer x id x
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27 s >>= f = mu (eqmap f s)
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29 similer :: (Eq a) => (a -> a) -> (a -> a) -> a -> a
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30 similer f g x = same $ Similer x g (f x)
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34 double :: Int -> Int
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35 double x = (2 * x)
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37 twicePlus :: Int -> Int
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38 twicePlus x = x + x
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40 plusTwo :: Int -> Int
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41 plusTwo x = x + 2
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43 -- samples
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45 {-
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46 *Main> same $ Main.return 100 Main.>>= (\x -> Similer x twicePlus $ double x)
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47 200
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49 *Main> same $ Main.return 2 Main.>>= (\x -> Similer x plusTwo $ double x)
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50 4
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52 *Main> same $ Main.return 100 Main.>>= (\x -> Similer x plusTwo $ double x)
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53 *** Exception: Prelude.undefined
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54 -}