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Jul 22, 2019
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Add parFmap function #53

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9 changes: 9 additions & 0 deletions Control/Parallel/Strategies.hs
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Expand Up @@ -62,6 +62,7 @@ module Control.Parallel.Strategies (
-- * Strategies for traversable data types
, evalTraversable -- :: Traversable t => Strategy a -> Strategy (t a)
, parTraversable
, parFmap

-- * Strategies for lists
, evalList -- :: Strategy a -> Strategy [a]
Expand Down Expand Up @@ -615,6 +616,14 @@ chunk n xs = as : chunk n bs where (as,bs) = splitAt n xs
parMap :: Strategy b -> (a -> b) -> [a] -> [b]
parMap strat f = (`using` parList strat) . map f


-- | A generalisation of 'parMap' using 'parTraversable' and `fmap`:
--
-- > parFmap strat g = withStrategy (parTraversable strat) . fmap f
--
parFmap :: Traversable t => Strategy b -> (a -> b) -> t a -> t b
parFmap strat f = (`using` parTraversable strat) . fmap f

-- --------------------------------------------------------------------------
-- Strategies for lazy lists

Expand Down