> On 22 November 2010 07:48, Magicloud Magiclouds > <[email protected] <mailto:[email protected]>> > wrote: > > Hi, > For example, I have a data A defined. Then I want to add (+) and (-) > operators to it, as a sugar (compared to addA/minusA). But * or other > stuff defined in class Num is meanless to A. So I just do: > (+) :: A -> A -> A > (+) a b = > A (elem1 a + elem1 b) (elem2 a + elem2 b) -- I got errors here, for > the (+) is ambiguous. > > So, just wondering, does this way work in Haskell?
(*) and (+) are in separate type classes in Numeric-Prelude. _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
