Re: [Haskell-cafe] Make Show instance

The documentation for the Show typeclass has this very example: http://hackage.haskell.org/packages/archive/base/latest/doc/html/Prelude.htm... The summary? you need to define either showPrec or show, the latter of which is simpler, it is just a -> String. So: instance Show (Tree Int Int) where show (Tree (Node (k,v)) left right) = ... On Jul 21, 2011, at 10:55 AM, Александр wrote:

Hello, thank you for reply. I know that i can derive this. But i want to know how can i make it by hand.

Thank you. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe