On 11/28/06, Bulat Ziganshin <[EMAIL PROTECTED]> wrote:
Hello Slavomir,
Tuesday, November 28, 2006, 3:46:13 PM, you wrote:
> Last question: Does haskell have something like C++ templates? For
> example, some time in the future I may need types like int2, short3,
> etc., that behave just like float2, float3, but use different types
> for their components. I really, really wouldn't like to copy-paste the
> definitions of floatn and manually change their types to intn
> respectfully.
yes, it's named parameterized types:
data Vec2 a = Vec2 !a !a
instance (Num a) => Num (Vec2 a) where
(Vec2 a1 a2) + (Vec2 b1 b2) = Vec2 (a1+b1) (a2+b2)
....
type Float2 = Vec2 Float
I wasn't aware of parameterized types, they are sweet. Thank you very much.
What about my other questions? Do you have any suggestions? I know
that this is very library specific. All I am asking is for some
Haskell common sense. What would you do, if you were writing this kind
of library?
Cheers.
--
Slavomir Kaslev
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