From c3641121d9fd1d091882002a908f0661221b39b2 Mon Sep 17 00:00:00 2001
From: Spencer Janssen <sjanssen@cse.unl.edu>
Date: Thu, 20 Sep 2007 22:57:11 +0200
Subject: Use derived Show and Read instances for Mirror

darcs-hash:20070920205711-a5988-822fbb9bc11937cccbc74252d6be2452cebedcd4
---
 Operations.hs | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/Operations.hs b/Operations.hs
index 1cb0201..d18bd99 100644
--- a/Operations.hs
+++ b/Operations.hs
@@ -375,13 +375,7 @@ mirrorRect :: Rectangle -> Rectangle
 mirrorRect (Rectangle rx ry rw rh) = (Rectangle ry rx rh rw)
 
 -- | Mirror a layout, compute its 90 degree rotated form.
-data Mirror l a = Layout l a => Mirror (l a)
-instance Layout l a => Show (Mirror l a) where
-    show (Mirror l) = "Mirror "++show l
-instance Layout l a => Read (Mirror l a) where
-    readsPrec _ s = case take (length "Mirror ") s of
-                      "Mirror " -> map (\ (l,s') -> (Mirror l,s')) $ reads $ drop (length "Mirror ") s
-                      _ -> []
+data Mirror l a = Mirror (l a) deriving (Show, Read)
 
 instance Layout l a => Layout (Mirror l) a where
     doLayout (Mirror l) r s = do (wrs, ml') <- doLayout l (mirrorRect r) s
-- 
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