21 Nov
2005
21 Nov
'05
5:30 a.m.
Am Montag, 21. November 2005 08:31 schrieb Bulat Ziganshin:
Hello Wolfgang,
Sunday, November 20, 2005, 6:21:05 PM, you wrote:
data Coord = { x,y :: Double } data Point : Coord = { c :: Color }
A point is not a special coordinate pair. Instead it has a coordinate paar as one of its properties. So the above-mentioned problem would be better handled this way:
data Coord { x, y :: Double } data Point = Point {coord :: Coord, c :: Color }
because this allows a large number of procedures written to work with Coord, to automatically work with Point. iy just a matter of usability. currently, my program is full of double-dereferncing, like this:
[...]
You should never use bad design to increase usability, I'd say.
[...]
Best wishes, Wolfgang