Hi,
I'm trying to do something like the following:
class Foo a where
doit :: (String - IO ()) - a - IO ()
instance Foo Int where
doit f = f . show
instance Foo Char where
doit f = f . (:[])
So now I have a doit function for Ints and Chars, that takes a function
and does the IO
Hello,
I'm learning haskell and I'm having some trouble with type classes. I
understand them conceptually, but when I try to create an instance I run
into problems. As a simple example, I create a class called ToInt:
class ToCh a where
int :: a - Int
Then I create an
At 2001-10-04 08:31, Russo, Tom wrote:
Main int 5
ERROR - Unresolved overloading
*** Type : (Num a, ToInt a) = Int
*** Expression : int 5
Can someone explain what the problem is, and how to interpret the error
message I'm getting?
Oh, 5 isn't necessarily an Int. It's of type Num a = a,
