On 2008-04-18 13:53:20 David MacIver wrote:
> On Fri, Apr 18, 2008 at 1:28 PM, David MacIver
> <
david.maciver@...> wrote:
> > > Non-local returns are implemented via exceptions, so they are
> > > not really efficient. I think any move away from iterators is
> > > likely to imply a performance loss.
> >
> > I disagree. Exceptions are extremely fast on the JVM and have been
> > for years. They basically compile to gotos. It's just stack trace
> > generation which is slow, which you can surpress in your
> > implementation of Throwable (which I assume Scala's non-local
> > returns do. If not, I'd consider that a bug. I'll check later).
>
> Looks like it doesn't. I've filed a bug:
>
https://lampsvn.epfl.ch/trac/scala/ticket/775There's a reason: if a closure escapes its defining method then the
exception will propagated as normal. This would be a pain to track down
without a stack trace.
/J
