Making count return a correct long or BigInt value in such cases would be a
significant change, given that Java's int is used for the return value for
many count() and countFrom() methods sprinkled around Clojure's source code.
I've created a ticket CLJ-1229 and attached a patch that causes count to
throw an ArithmeticException if the sequence contains more than
Integer/MAX_VALUE elements. I don't know if such a patch is acceptable to
the Clojure/core team or not, but we may find out.
http://dev.clojure.org/jira/browse/CLJ-1229
Andy
On Sun, Jul 7, 2013 at 5:13 PM, John Jacobsen <eigenhom...@gmail.com> wrote:
> Was unsure whether to post to clojure or clojure-dev, but here goes.
>
> I was surprised to learn today that count silently overflows to negative
> numbers:
>
> jenome.core> (time (count (range (*' 1000 1000 1000 3))))
> "Elapsed time: 375225.663 msecs"
> -1294967296
> jenome.core>
>
> I can easily get around this with my own (non-overflowing) count function,
> but would it make sense for count throw an ArithmeticException on overflow,
> with *unchecked-math* set to false (as it is in my case)?
>
> Curiously,
> John
>
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