Cool, thanks guys :)

Jim


On 25/03/13 15:34, David Powell wrote:


On Mon, Mar 25, 2013 at 3:24 PM, Jim foo.bar <jimpil1...@gmail.com <mailto:jimpil1...@gmail.com>> wrote:

    On 25/03/13 15:22, Ben Wolfson wrote:

        The 94th fibonacci number is greater than Long/MAX_VALUE, so it
        overflows. It is using longs.


    I see....shouldn't Clojure auto-promote it to a BigInt then?


It doesn't by default.

There are two options:

a) artithmetic is polymorphic, and given a bigint argument, will use bigint arithmetic, so use 0N as suggested.

b) use the auto-promoting arithmentic forms: +'  -'  *'  inc'  etc.

Clojure used to do auto-promotion, but it is off by default now as it has a significant performance impact. In Java, a slot can either be a primitive or an object, so the auto-promoting forms are forced to box primitive objects in java.lang.Long wrappers.


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