Class Question

23 Jan 2003

      Hi all,

I have yet another question.  I think I have too much time on my hands.

I have two functions:
...
rf     :: (RealFloat a, Integral b) => [a] -> b -> Complex a
rf x k = ...
...
cf     :: (RealFloat a, Integral b) => [Complex a] -> b -> Complex a
cf x k = ...
I would like to add these to the class system so I can create an
overloaded version, f.
...
From my understanding of the Report, the following should work, but I
get an error, which I really don't understand.
...
class (Fractional a) => Floating a where
    f :: (Integral b) => [a] -> b -> a
...
instance (RealFloat a) => Floating a where
    f x k = rf x k
...
instance (RealFloat a) => Floating (Complex a) where
    f x k = cf x k
hugs98 spits out

	ERROR "f.lhs":59 - Syntax error in instance head (constructor
expected)  

where line 59 is the first instance declaration.  Can anyone give me
some guidance, or hints, here?

Thanks a million.

-- 
Matthew Donadio (m.p.donadio@ieee.org)