projects
/
ghc-base.git
/ blobdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
|
commitdiff
|
tree
raw
|
inline
| side by side
add GHC.HetMet.{hetmet_kappa,hetmet_kappa_app}
[ghc-base.git]
/
Data
/
Either.hs
diff --git
a/Data/Either.hs
b/Data/Either.hs
index
d22e91c
..
6ffc607
100644
(file)
--- a/
Data/Either.hs
+++ b/
Data/Either.hs
@@
-1,4
+1,8
@@
-{-# OPTIONS_GHC -XNoImplicitPrelude #-}
+{-# LANGUAGE CPP, NoImplicitPrelude #-}
+#ifdef __GLASGOW_HASKELL__
+{-# LANGUAGE DeriveDataTypeable, DeriveGeneric, StandaloneDeriving #-}
+#endif
+
-----------------------------------------------------------------------------
-- |
-- Module : Data.Either
-----------------------------------------------------------------------------
-- |
-- Module : Data.Either
@@
-21,11
+25,18
@@
module Data.Either (
partitionEithers, -- :: [Either a b] -> ([a],[b])
) where
partitionEithers, -- :: [Either a b] -> ([a],[b])
) where
-import Data.Tuple
+#include "Typeable.h"
#ifdef __GLASGOW_HASKELL__
import GHC.Base
#ifdef __GLASGOW_HASKELL__
import GHC.Base
+import GHC.Show
+import GHC.Read
+#endif
+
+import Data.Typeable
+import GHC.Generics (Generic)
+#ifdef __GLASGOW_HASKELL__
{-
-- just for testing
import Test.QuickCheck
{-
-- just for testing
import Test.QuickCheck
@@
-41,7
+52,8
@@
either correct or an error; by convention, the 'Left' constructor is
used to hold an error value and the 'Right' constructor is used to
hold a correct value (mnemonic: \"right\" also means \"correct\").
-}
used to hold an error value and the 'Right' constructor is used to
hold a correct value (mnemonic: \"right\" also means \"correct\").
-}
-data Either a b = Left a | Right b deriving (Eq, Ord )
+data Either a b = Left a | Right b
+ deriving (Eq, Ord, Read, Show, Generic)
-- | Case analysis for the 'Either' type.
-- If the value is @'Left' a@, apply the first function to @a@;
-- | Case analysis for the 'Either' type.
-- If the value is @'Left' a@, apply the first function to @a@;
@@
-51,6
+63,8
@@
either f _ (Left x) = f x
either _ g (Right y) = g y
#endif /* __GLASGOW_HASKELL__ */
either _ g (Right y) = g y
#endif /* __GLASGOW_HASKELL__ */
+INSTANCE_TYPEABLE2(Either,eitherTc,"Either")
+
-- | Extracts from a list of 'Either' all the 'Left' elements
-- All the 'Left' elements are extracted in order.
-- | Extracts from a list of 'Either' all the 'Left' elements
-- All the 'Left' elements are extracted in order.
@@
-71,8
+85,8
@@
rights x = [a | Right a <- x]
partitionEithers :: [Either a b] -> ([a],[b])
partitionEithers = foldr (either left right) ([],[])
where
partitionEithers :: [Either a b] -> ([a],[b])
partitionEithers = foldr (either left right) ([],[])
where
- left a (l, r) = (a:l, r)
- right a (l, r) = (l, a:r)
+ left a ~(l, r) = (a:l, r)
+ right a ~(l, r) = (l, a:r)
{-
{--------------------------------------------------------------------
{-
{--------------------------------------------------------------------