[Haskell-cafe] instance Enum Double considerednotentirelygreat?
cdsmith at gmail.com
Tue Sep 27 20:12:57 CEST 2011
On Tue, 2011-09-27 at 09:23 -0700, Donn Cave wrote:
> I think it's more than reasonable to expect
> [0.1,0.2..0.5] == [0.1,0.2,0.3,0.4,0.5]
> and that would make everyone happy, wouldn't it?
But what's the justification for that? It *only* makes sense because
you used short decimal literals. If the example were:
let a = someComplicatedCalculation
b = otherComplicatedCalculation
c = thirdComplicatedCalculation
in [a, b .. c]
then it would be far less reasonable to expect the notation to fudge the
numbers in favor of obtaining short decimal representations, which is
essentially what you're asking for.
More information about the Haskell-Cafe