On Dec 15, 10:05 am, Ken Wesson <kwess...@gmail.com> wrote:
> On Wed, Dec 15, 2010 at 12:52 PM, Mike Meyer
>
> <mwm-keyword-googlegroups.620...@mired.org> wrote:
> > One of the things those of us on your side *begged* for (and
> > apparently also didn't get) was that the versions with correct
> > behavior not have second-class names. That we didn't get them means
> > we'll have to provide them ourselves, but it's easy. Since we're
> > having to fix code anyway, just use a file containing something like:
>
> > (def add +')
> > (def sub -')
> > (def mul *')
> > (def add1 inc')
> > (def sub1 dec')
>
> I'd much rather exclude +, -, etc. when importing core and then (def +
> +'), etc. and (def unchecked-+ clojure.core/+) etc.
>
> Of course that adds enough boilerplate to the code to make me want to
> write a my-ns macro that passes most of its arguments through to ns
> but does all of the above as well.
>
> And still leaves me no way to get the old unchecked-+ speed and
> behavior (wrap on overflow rather than compare-and-branch then throw).
> I can only hope the branch prediction in modern CPUs will mostly
> prevent the speed loss from this change.
This was one of the stated features of the new release:
user=> *clojure-version*
{:major 1, :minor 3, :incremental 0, :qualifier "alpha4"}
user=> (doc *unchecked-math*)
-------------------------
clojure.core/*unchecked-math*
While bound to true, compilations of +, -, *, inc, dec and the
coercions will be done without overflow checks. Default: false.
-Jason
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