On Sun, Sep 13, 2009 at 17:40:33 +0200, Jürg Billeter wrote:
> This should be `yield return i;'. We do not use/need `yield return' for
> async methods, and I'm planning to add support for `yield return' for
> generators in Vala the same way as it's used in C#. I don't see a
> conflict here.
Ok. You are right. It's a bit ugly syntax from C# but that does not matter.
> > This has nothing to do with asynchronous at all.
> >
> > I understand this is would be complicated to implement, but please at least
> > don't use any of that syntax in an incompatible way.
> >
> > Virtual machines actually have it pretty easy to implement. They just stash
> > away the running function state and than resume it. Vala can't easily do
> > that, but I see two options for it:
> >
> > - Generate the function in a special way so it is restartable. This would
> > mean to generate an anonymous class. All arguments and variables would be
> > converted to members of that class. Plus one extra member would remember
> > which point the function last returned at. Than if the function contained
> > no block-local variables, it should be possible to wrap it in a big case
> > (similar to what Duff's device uses) to jump to the correct point to
> > continue.
>
> That's roughly what we already do for async methods, and the
> implementation will be very similar for generators.
I see now. Nice, indeed.
--
Jan 'Bulb' Hudec <[email protected]>
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