Very pretty, Keean, though to get it to work in Hugs Nov 2002 I had to
type the following uglier but equivalent syntax
> myInterval = Interval {
> isin = (\r ->
> if r == 0.6 then True else
> if r > 0.7 && r < 1.0 then True else
> False )
> }
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Keean Schupke
Sent: Wednesday, October 27, 2004 3:53 AM
To: Stijn De Saeger
Cc: [EMAIL PROTECTED]
Subject: Re: [Haskell-cafe] Set of reals...?
I think someone else mentioned using functions earlier, rather than a
datatype why not define:
data Interval = Interval { isin :: Float -> Bool }
Then each range becomes a function definition, for example:
myInterval = Interval {
isin r
| r == 0.6 = True
| r > 0.7 && r < 1.0 = True
| otherwise = False
}
Then you can test with:
(isin myInterval 0.6)
Keean
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