Re: [Haskell-cafe] How to organize code

28 Jan 2008


      On 1/27/08, L.Guo  wrote:
...
Hi,
How do you organize code ?
Here is a sample.
Acturally, I am thinking about using this plan.
Any suggestions ?
...
-- BasicalType.hs
type Position = (Int,Int)
data Box = Box { pos :: Position }
data Chain = Chain { pos :: [Position] }
...
-- Object.hs
import BasicalType
class Object o where
  pos :: o -> [Position]
...
-- Type.hs
import BasicalType
import Object
instance Object Box where
  pos = return . BasicalType.pos
instance Object Chain where
  pos = BasicalType.pos
...
-- Main.hs
import Type
...
Be careful not to confuse Haskell's type class system with the idea of
a "class" in object-oriented programming. I suggest you read this
article:
http://trevion.blogspot.com/2007/02/snowball-chance.html

Cheers,
Tim

-- 
Tim Chevalier * http://cs.pdx.edu/~tjc * Often in error, never in doubt
"...It's a thin line between amateur and professional, a line mostly
emphasized by insecure professionals." -- Bob Franke