Add parFmap function by Boarders · Pull Request #53 · haskell/parallel

Boarders · 2019-07-19T15:02:11Z

Control.Parallel.Strategies defines:

parMap :: Strategy b -> (a -> b) -> [a] -> [b]
parMap strat f = (`using` parList strat) . map f

However parList is defined in terms of parTraversable:

parList :: Strategy a -> Strategy [a]
parList = parTraversable

This pull request generalises parMap to:

parFmap :: Traversable t => Strategy b -> (a -> b) -> t b -> t b
parFmap strat g = (`using` parTraversable strat) . fmap f

The old definition is still left in place.

Add parFmap function

56d4444

simonmar merged commit 2e1e6ac into haskell:master Jul 22, 2019

konsumlamm mentioned this pull request May 10, 2022

Generalise parMap #52

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