Here's the latest version of my DeepSeq module.
Dean
DeepSeq.lhs -- deep strict evaluation support
The `DeepSeq` class provides a method `deepSeq` that is similar to `seq` except that it forces deep evaluation of its first argument before returning its second argument.
Instances of `DeepSeq` are provided for Prelude types. Other instances must be supplied by users of this module.
$Id: DeepSeq.lhs,v 1.5 2002/04/01 20:58:24 heringto Exp $
module DeepSeq where
class DeepSeq a where deepSeq :: a -> b -> b
infixr 0 `deepSeq`, $!!
($!!) :: (DeepSeq a) => (a -> b) -> a -> b f $!! x = x `deepSeq` f x
instance DeepSeq () where deepSeq = seq
instance DeepSeq Bool where deepSeq = seq instance DeepSeq Char where deepSeq = seq
instance (DeepSeq a) => DeepSeq (Maybe a) where deepSeq Nothing y = y deepSeq (Just x) y = deepSeq x y
instance (DeepSeq a, DeepSeq b) => DeepSeq (Either a b) where deepSeq (Left a) y = deepSeq a y deepSeq (Right b) y = deepSeq b y
instance DeepSeq Ordering where deepSeq = seq
instance DeepSeq Int where deepSeq = seq instance DeepSeq Integer where deepSeq = seq instance DeepSeq Float where deepSeq = seq instance DeepSeq Double where deepSeq = seq
instance DeepSeq (a -> b) where deepSeq = seq
instance DeepSeq (IO a) where deepSeq = seq
instance (DeepSeq a) => DeepSeq [a] where deepSeq [] y = y deepSeq (x:xs) y = deepSeq x $ deepSeq xs y
instance (DeepSeq a,DeepSeq b) => DeepSeq (a,b) where
deepSeq (a,b) y = deepSeq a $ deepSeq b y
instance (DeepSeq a,DeepSeq b,DeepSeq c) => DeepSeq (a,b,c) where
deepSeq (a,b,c) y = deepSeq a $ deepSeq b $ deepSeq c y
instance (DeepSeq a,DeepSeq b,DeepSeq c,DeepSeq d) => DeepSeq (a,b,c,d) where
deepSeq (a,b,c,d) y = deepSeq a $ deepSeq b $ deepSeq c $ deepSeq d y
instance (DeepSeq a,DeepSeq b,DeepSeq c,DeepSeq d,DeepSeq e) => DeepSeq (a,b,c,d,e) where
deepSeq (a,b,c,d,e) y = deepSeq a $ deepSeq b $ deepSeq c $ deepSeq d $ deepSeq e y
instance (DeepSeq a,DeepSeq b,DeepSeq c,DeepSeq d,DeepSeq e,DeepSeq f) => DeepSeq (a,b,c,d,e,f) where
deepSeq (a,b,c,d,e,f) y = deepSeq a $ deepSeq b $ deepSeq c $ deepSeq d $ deepSeq e $ deepSeq f y
instance (DeepSeq a,DeepSeq b,DeepSeq c,DeepSeq d,DeepSeq e,DeepSeq f,DeepSeq g) => DeepSeq (a,b,c,d,e,f,g) where
deepSeq (a,b,c,d,e,f,g) y = deepSeq a $ deepSeq b $ deepSeq c $ deepSeq d $ deepSeq e $ deepSeq f $ deepSeq g y
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