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]
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