Re: idea: __iter generic-for metamethod

["Stuart P. Bentley" <stuart@...>]

> > Note that I'm not the king of generic for iteration, and if this  
> > appears to
> > change the semantics of generic for iterators, that is unintentional.  
> > The
> > goal was to show the logic flow for selecting an iterator with  
> > metamethods.
> > (It also assumes generic_for_iterate only proceeds after the code  
> > inside the
> > loop has been evaluated, of course.)
> >
> > [1] http://lua-users.org/lists/lua-l/2010-05/msg00581.html
>
> Correct me if I'm wrong - I'm having just a little trouble following
> the code - but is this executed for every iteration? I posted an
> example a few minutes ago that translates to the current definitions
> of the generic and numeric for - so it's really a mapping from pure
> syntax to one of the two for's - but I'm not sure where this one fits.
In terms of section 2.4.5 of the Lua 5.1.4 manual, this would be roughly  
analogous to the lines between "while true do" and "block". It's not  
perfect, though- as I said, I'm not great with generic for iterators,  
though I've been boning up in the last 15 minutes or so, and I think I  
could rewrite this to be a bit more clear.

> I'm not sure I see where the loop body is getting executed either, but
> again, I might just not be following it right.
It's not explicitly written- it would be somewhere between the call and  
the execution. (Like I said, the example is far from perfect.)

> ~Jonathan