Re: Abolishing the numeric-for
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- Subject: Re: Abolishing the numeric-for
- From: Jonathan Castello <twisolar@...>
- Date: 2010年5月24日 15:03:55 -0700
On Mon, May 24, 2010 at 2:57 PM, M Joonas Pihlaja
<jpihlaja@cc.helsinki.fi> wrote:
> I'm slightly wary of your proposal because it 1) adds even more
> implicit magic to the language
No more magical than metatables in general, in my opinion, but okay.
> 2) breaks the current iterator protocol
Hrm, I tried to make sure it didn't do that. What about it does this?
It takes the first item on the right and first tries its __iter, then
tries to call it. All current uses I can reasonably think of should
still work unchanged.
> 3) is likely to have significant overhead in the loop setup
> compared to explicit numeric for loops.
Fair enough.
~Jonathan