Re: [Haskell-cafe] How to "Show" an Operation?

On Friday 04 June 2010 17:37:16, Martin Drautzburg wrote:

Dear all,

If I have a problem where I have to select from a set of operations, how would I print the result?

Example: If I can chose from (x+y), (x*y), (x^2+y)... and I feed them all into my problem solver and it finds that "(x*y) is right", how can I print that string?

You'd have to pass the description string to the problem solver too. If it was previously solver :: Num a => Whatever -> [a -> a -> a] -> Result it would become for example solver :: Num a => Whatever -> [(a -> a -> a, String)] -> Result