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 > courten...@gmail.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe