Re: Was it decided to add these functions to core?

[Stephen C. Gilardi]

On Jun 23, 2009, at 6:41 PM, Chouser wrote:

On Tue, Jun 23, 2009 at 5:15 PM, Stephen C. Gilardi<squee...@mac.com> wrote:

http://groups.google.com/group/clojure/browse_frm/thread/5e665ce7a318f44a/158419414f9150a0?lnk=gst&q=%3Ainfinity#158419414f9150a0

Gah, I stole your idea!  And your name was better, too.

Sorry about that,
--Chouser

Thanks, but I wasn't offended even a little. :-)







        (in-ns 'clojure.core)
        (def +infinity Double/POSITIVE_INFINITY)
        (def -infinity Double/NEGATIVE_INFINITY)

...

        user=> +infinity
        Infinity
        user=> (- +infinity)
        -Infinity
        user=> (< 2 +infinity)
        true
        user=> (> 2 +infinity)
        false
        user=>(- (- +infinity) -infinity)
        NaN



Cheers,

--Steve

I was happy to see it discussed again and thought my previous post could be useful for that. I looked at what it would take to implement :infinity support in range and it seems it could be efficient and not too ugly. Joshua's suggestion of a clojure.core name for Double/ POSITIVE_INFINITY sounds possibly generally useful and could be made efficient in range by using it as a marker rather than for every comparison with end. There may be potential pitfalls, but so far I thing these would useful additions to Clojure's support for numbers.

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