[Haskell-cafe] instance Enum Double considered not entirely great?
allbery.b at gmail.com
Wed Sep 21 03:15:14 CEST 2011
On Tue, Sep 20, 2011 at 17:56, Evan Laforge <qdunkan at gmail.com> wrote:
> > I actually think the brokenness of Ord for floating point values is
> > worse in many ways, as demonstrated by the ability to insert a value
> > into a Data.Set.Set and have other values "disappear" from the set as
> Whoah, that's scary. What are some examples of this happening? Does
> this mean it's unsafe to store Doubles in a Map?
It's unsafe to use them as a key ((Set a) being effectively (Map a ())), but
that should be pretty obvious anyway given that (==) isn't reliable for
brandon s allbery allbery.b at gmail.com
wandering unix systems administrator (available) (412) 475-9364 vm/sms
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