--- Brian Hulley wrote:
def myeval(x, y, op) x.send op, y end
This could be done in Haskell by
myeval :: a->b->(a -> b -> c) -> c myeval x y op = op x y
eg myeval (+) 1 2
Though the following program does indeed work: myeval :: (Int -> Int -> Int) -> Int -> Int -> Int myeval op x y = op x y main :: IO () main = do putStrLn $ show (myeval (+) 2 3) I can't hardwire (+) because the operator is unknown at compile time; it is input to the program at run time as a string ("+" in this example). My problem is how to convert the string "+" to the operator (+) at run time. Well, I could do it with a lookup table: mycvt :: String -> (Int -> Int -> Int) mycvt "+" = (+) mycvt "-" = (-) mycvt "*" = (*) but that is what I'm trying to avoid (I was naively hoping that the read function could magically do it somehow :-). /-\ Send instant messages to your online friends http://au.messenger.yahoo.com