Agree, it's broken... in java...
Has it has been broken in the past in several architectures...
I understand your frustration but this is not something new. It's been a
problem for at least 30 years.
It is kind of a basic programming issue:
- Never compare floats with different representations.
- Never mix different representations in computations
- Convert representations as early as possible to a common format
These are the rules to follow to avoid running into trouble.
Now if you think you can overcome this persistent (ah ! ah !) problem with some
David Copperfield trick, fine.
But that's a trick nothing else. The problem will resurface in some form in
another. Better cope with reality...
Luc P.
> On Jan 23, 2015, at 1:33 AM, Immo Heikkinen <immo.heikki...@gmail.com> wrote:
> >
> > I actually ran into this while comparing nested data structures from two
> > different sources and spent a good part of my day figuring out what's
> > happening. While it is a good advice to avoid mixing floats and doubles, it
> > is inevitable that Clojure users will get bitten by this once in a while
> > and hours will be wasted.
> >
> > It is also very disturbing to realise that "(= a b)" doesn't always imply
> > "(= (hash a) (hash b))" or "(= #{a} #{b})" as you would think.
>
> (inc)
>
> This is fundamentally broken behavior. Telling people to just learn to avoid
> it is not good, IMO. If the hashes must be unequal, then = should return
> false.
>
> As for backwards compatibility, note that if such a change were made to =, it
> wouldn't affect anyone who was already following Andy's advice to avoid
> mixing doubles and floats. IOW, it should only affect those who are doing
> something you're not "supposed" to do anyway.
>
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Luc Prefontaine<lprefonta...@softaddicts.ca> sent by ibisMail!
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