Re: Threaded In-Line Code (was Re: Typed Intermediate Language)

[Graham Barr]

On Tue, Aug 15, 2000 at 11:17:17AM -0400, Dan Sugalski wrote:
> At 11:23 AM 8/15/00 +0100, Graham Barr wrote:
> >On Tue, Aug 15, 2000 at 02:03:12PM +1000, Jeremy Howard wrote:
> > > The PDL team are now examining how to incorporate these kinds of features
> > > into perl 6. I'm also interested in seeing how to implement things like
> > > (from RFC 82)
> > >
> > > <quote>
> > >   @b = (1,2,3);
> > >   @c = (2,4,6);
> > >   @d = (-2,-4,-6);
> > >   $sum = reduce ^_+^_, @b * @c + @d;
> >
> >Well if operators were made to return iterators in a list context
> >then I can see that that would work. For example
> >
> >   @b * @c would create an iterator which would return the
> >product of the elements in turn. <iter> + @d would
> >be an iterator that return the sum of the next value from
> ><iter> and the next from @d. This final iterator is
> >what is passed to reduce. redice calls <iter>->next to
> >get the next value.
> 
> I was actually thinking that @b * @c would boil down to a single vtable 
> call--we'd just hit the multiply function for variable @b, and pass it a 
> pointer to @c, and let it Do The Right Thing.

Sure, I am just saying that function would return an iterator

Graham.