Difference between revisions of "Implicit parameters"
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− | {{GHCUsersGuide|glasgow_exts|implicit-parameters|Implicit Parameters section}} |
+ | {{GHCUsersGuide|glasgow_exts|implicit-parameters|an Implicit Parameters section}} |
Working example: |
Working example: |
Revision as of 00:28, 14 November 2016
The GHC Users Guide has an Implicit Parameters section.
Working example:
{-# LANGUAGE ImplicitParams #-} import Data.List (sortBy) sortBy' :: (?cmp :: a -> a -> Ordering) => [a] -> [a] sortBy' = sortBy ?cmp
sort :: Ord a => [a] -> [a] sort = let ?cmp = compare in sortBy' main = putStrLn (show (sort [3,1,2]))