[project @ 2001-07-03 14:13:32 by simonmar]

[ghc-base.git] / Data / Either.hs

diff --git a/Data/Either.hs b/Data/Either.hs
index f3cd106..20dfe47 100644 (file)
--- a/Data/Either.hs
+++ b/Data/Either.hs
@@ -7,9 +7,9 @@
 -- 
 -- Maintainer  :  libraries@haskell.org
 -- Stability   :  experimental
--- Portability :  non-portable
+-- Portability :  portable
 --
--- $Id: Either.hs,v 1.1 2001/06/28 14:15:02 simonmar Exp $
+-- $Id: Either.hs,v 1.3 2001/07/03 14:13:32 simonmar Exp $
 --
 -- The Either type, and associated operations.
 --
@@ -21,5 +21,11 @@ module Data.Either (
  ) where
 
 #ifdef __GLASGOW_HASKELL__
-import GHC.Maybe
+import GHC.Base
 #endif
+
+data  Either a b  =  Left a | Right b  deriving (Eq, Ord )
+
+either                  :: (a -> c) -> (b -> c) -> Either a b -> c
+either f _ (Left x)     =  f x
+either _ g (Right y)    =  g y