Hello Wolfgang, Sunday, November 20, 2005, 6:21:05 PM, you wrote:
>> data Coord = { x,y :: Double } >> data Point : Coord = { c :: Color } WJ> A point is not a special coordinate pair. Instead it has a coordinate paar as WJ> one of its properties. So the above-mentioned problem would be better WJ> handled this way: WJ> data Coord { x, y :: Double } WJ> 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: if (fiTime (cfFileInfo arcfile) >= fiTime (cfFileInfo diskfile)) maximum (last_time' : map (fiTime.cfFileInfo) dir) let size = fiSize (cfFileInfo cfile') bytes = sum$ map (fiSize.cfFileInfo) directory let keyFunc = fiStoredName . cfFileInfo -- Best regards, Bulat mailto:[EMAIL PROTECTED] _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe