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Add strict liftM #23

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Nov 17, 2016
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Add strict liftM #23

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9 changes: 8 additions & 1 deletion Control/DeepSeq.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@
--
-- @since 1.1.0.0
module Control.DeepSeq (
deepseq, ($!!), force,
deepseq, ($!!), force, (<$!!>),
NFData(..),
) where

Expand Down Expand Up @@ -209,6 +209,13 @@ f $!! x = x `deepseq` f x
force :: (NFData a) => a -> a
force x = x `deepseq` x

-- | Deeply strict version of 'Control.Applicative.<$>'.
--
-- @since 1.4.3.0
(<$!!>) :: (Monad m, NFData b) => (a -> b) -> m a -> m b
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This doesn't appear to be exported from Control.DeepSeq:

Control/DeepSeq.hs:216:3: warning: [-Wunused-top-binds]
    Defined but not used: ‘<$!!>’

f <$!!> m = m >>= \x -> return $!! f x
infixl 4 <$!!>

-- | A class of types that can be fully evaluated.
--
-- @since 1.1.0.0
Expand Down