On Monday 05 July 2010 15:22:43, Simon Courtenage wrote:
Hi,
I am porting a C++ program to Haskell. My current task is to take a class hierarchy and produce something equivalent in Haskell, but I don't seem to be able to get a grip on how type classes and instances contribute to the solution. Can anyone enlighten me?
Roughly, the class hierarchy in C++ is of the form
class A { public: virtual int do_x(int,int) = 0; };
class B { public: int do_x(int x,int y) { ...} };
class C { public: int do_x(int x,int y) { ...} };
Any help would be greatly appreciated.
If there's not more to it, class A where do_x :: Int -> Int -> Int instance A B where do_x = whatever instance A C where do_x = somethingElse would solve it.
Thanks
Simon courtenage@gmail.com