John Meacham writes: : | another useful thing would be | endOfTime and beginningOfTime constants, representing the minimum and | maximum values representable by ClockTime. : | _______________________________________________ | Haskell mailing list | Haskell@haskell.org | http://www.haskell.org/mailman/listinfo/haskell If you plan to use endOfTime and beginningOfTime mainly as sentinels, and are happy to treat them as +infinity and -infinity for arithmetic, a separate wrapper type may help. I've found the following (abridged) useful for 'closing off' data types which were otherwise open-ended:
data Close a = Lo | Mid a | Hi deriving (Eq, Ord, Show)
instance Bounded (Close a) where minBound = Lo maxBound = Hi
instance Num a => Num (Close a) where ... instance Real a => Real (Close a) where ... instance Enum a => Enum (Close a) where ... instance Integral a => Integral (Close a) where ...
Regards, Tom