Hi Denis,
Denis Bueno wrote:
where the rCompare field would be a function that is based on the
flags passed to the command-line problem. But this has an ugly
asymmetry. Does anyone have any other ideas?
Here's a solution that is more symmetrical but not necessarily prettier:
newtype Wrap = Wrap { unwrap :: Record }
instance Ord Wrap where
... your compare function here ...
But I don't think there's anything wrong with your original solution.
You can write your own sortBy and hide (not export) the CompareRecord type:
sortBy :: (a -> a -> Ord) -> [a] -> IO [a]
sortBy cmp = map unCR . sort . map (CompareRecord cmp)
HTH,
Martijn.
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