Difference between revisions of "Implicit parameters"

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m (Fix link to GHC doc)
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The GHC manual on implicit parameters: [http://www.haskell.org/ghc/docs/latest/html/users_guide/other-type-extensions.html#implicit-parameters].
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The GHC manual on implicit parameters: [https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts.html#implicit-parameters].
   
 
Working example:
 
Working example:

Revision as of 14:03, 9 July 2016

The GHC manual on implicit parameters: [1].

Working example:

{-# LANGUAGE ImplicitParams #-}

import Data.List (sortBy)

sort   :: (?cmp :: a -> a -> Ordering) => [a] -> [a]
sort    = sortBy ?cmp

main = let ?cmp = compare in putStrLn (show (sort [3,1,2]))