-{-# OPTIONS -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
-----------------------------------------------------------------------------
-- |
-- Module : Data.Tuple
default () -- Double isn't available yet
-#if !defined(__HUGS__) && !defined(__NHC__)
+#ifdef __GLASGOW_HASKELL__
data (,) a b = (,) a b deriving (Eq, Ord)
data (,,) a b c = (,,) a b c deriving (Eq, Ord)
data (,,,) a b c d = (,,,) a b c d deriving (Eq, Ord)
data (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t u v w x y z a_ b_ c_ d_ e_ f_ g_ h_ i_ j_ k_ l_ m_ n_ o_ p_ q_ r_ s_ t_ u_ v_ w_ x_ y_ z_ a__ b__ c__ d__ e__ f__ g__ h__ i__ j__ k__ l__ m__ n__ o__ p__ q__ r__ s__ t__ u__ v__ w__ x__ y__ z__ a___ b___ c___ d___ e___ f___ g___ h___ i___ j___ k___ l___ m___ n___ o___ p___ q___ r___ s___ t___ u___ v___
= (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t u v w x y z a_ b_ c_ d_ e_ f_ g_ h_ i_ j_ k_ l_ m_ n_ o_ p_ q_ r_ s_ t_ u_ v_ w_ x_ y_ z_ a__ b__ c__ d__ e__ f__ g__ h__ i__ j__ k__ l__ m__ n__ o__ p__ q__ r__ s__ t__ u__ v__ w__ x__ y__ z__ a___ b___ c___ d___ e___ f___ g___ h___ i___ j___ k___ l___ m___ n___ o___ p___ q___ r___ s___ t___ u___ v___
-}
-#endif /* neither __HUGS__ nor __NHC__ */
+#endif /* __GLASGOW_HASKELL__ */
-- ---------------------------------------------------------------------------
-- Standard functions over tuples
#if !defined(__HUGS__) && !defined(__NHC__)
+-- | Extract the first component of a pair.
fst :: (a,b) -> a
fst (x,_) = x
+-- | Extract the second component of a pair.
snd :: (a,b) -> b
snd (_,y) = y
--- curry converts an uncurried function to a curried function;
--- uncurry converts a curried function to a function on pairs.
+-- | 'curry' converts an uncurried function to a curried function.
curry :: ((a, b) -> c) -> a -> b -> c
curry f x y = f (x, y)
+-- | 'uncurry' converts a curried function to a function on pairs.
uncurry :: (a -> b -> c) -> ((a, b) -> c)
uncurry f p = f (fst p) (snd p)
#endif /* neither __HUGS__ nor __NHC__ */