acme-miscorder (empty) → 0.1.0.0

raw patch · 4 files changed

+197/−0 lines, 4 filesdep +basedep +randomsetup-changed

Dependencies added: base, random

Files

• Acme/MiscOrder.hs +53/−0
• LICENSE +121/−0
• Setup.hs +2/−0
• acme-miscorder.cabal +21/−0

@@ -0,0 +1,53 @@+{-|+This module contains a collection of orderings of dubious utility, inspired by <http://haskell.1045720.n5.nabble.com/A-Down-newtype-in-Data-Ord-td5005373.html this> discussion on the haskell-cafe mailing-list.+-}++module Acme.MiscOrder (+      Contrarian(..),+      LuckySortOrder(..),+      Perverse(..),+      Fiendish(..)+) where++import Control.Monad+import System.Random+import System.IO.Unsafe(unsafePerformIO)++reverseOrdering :: Ordering -> Ordering+reverseOrdering LT = GT+reverseOrdering EQ = EQ+reverseOrdering GT = LT++-- | This newtype inverts the result of the (==) function.+newtype Contrarian a = Contrarian a++instance Eq a => Eq (Contrarian a) where+    (==) (Contrarian x) (Contrarian y) = (/=) x y++-- | This newtype is perfect to transform any sorting algorithm into a lucky sort!+newtype LuckySortOrder a = LuckySortOrder a deriving (Eq)++instance Ord a => Ord (LuckySortOrder a) where+    (<=) (LuckySortOrder x) (LuckySortOrder y) = True++{-| +This newtype gives a random result for any two inequal values.+A warning though: given that I didn't manage to memoize a polymorphic function for use as a typeclass instance, its Ord instance can give different results on different calls with the same arguments.+-}+newtype Fiendish a = Fiendish a deriving (Eq, Show)++instance Eq a => Ord (Fiendish a) where+    compare x y+      | x == y = EQ+      | unsafePerformIO randomIO = LT+      | otherwise = GT+++-- | This newtype does respects the equality relation laws…by treating any two values as equal+newtype Perverse a = Perverse a++instance Eq (Perverse a) where+    (==) _ _ = True++instance Ord (Perverse a) where+    compare _ _ = EQ

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@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,21 @@+name:                acme-miscorder+version:             0.1.0.0+synopsis:            Miscellaneous newtypes for orderings of discutable use.+description:         A collection of newtypes with Ord and Eq instances with peculiar behaviours.+license:             PublicDomain+license-file:        LICENSE+author:              ARJANEN Loïc Jean David+maintainer:          arjanen.loic@gmail.com+copyright:           © 2015 ARJANEN Loïc Jean David+category:            Acme+build-type:          Simple+cabal-version:       >=1.10++library+  exposed-modules:     Acme.MiscOrder+  build-depends:       base >=4.7 && <4.8, random+  default-language:    Haskell98++Source-Repository head+  Type:     darcs+  Location: http://hub.darcs.net/Azel/acme-miscorder