[Haskell-cafe] Wondering if this could be done.

[Christopher Done]

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 at 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
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