Check out the awesome prelude, used to define ESDLs: http://tom.lokhorst.eu/2010/02/awesomeprelude-presentation-video On 22 November 2010 07:48, Magicloud Magiclouds < magicloud.magiclouds@gmail.com> 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? -- 竹密岂妨流水过 山高哪阻野云飞 _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe