Re: 5.1
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- Subject: Re: 5.1
- From: Glenn Maynard <glenn@...>
- Date: 2005年10月18日 02:24:24 -0400
On Mon, Oct 17, 2005 at 11:42:01PM -0500, Rici Lake wrote:
> function f(...) for x,y in ... do print(x) end end
> t = { 1, 2, 3 }
> f( pairs(t) )
(I pruned the fixed version from my reply for brevity, but if people
really needed it, there they go. :)
> There's no problem with multiple-results here; you simply haven't
> provide for multiple arguments.
The problem is that design of the language, in this area, is unintuitive
and unnatural to me. The multiple-results documentation in PiL reads like
a checklist of special cases to be memorized. I'm not saying it's something
that should or could be changed; it just feels forced.
> Clearly, run-time warnings are a non-starter. At run-time, you either
> get an error or a strange result or it works. (In the case of the C
> problem, writing = for ==, you tend to get strange results.)
It's a reasonable approach, just not a good one for Lua's minimalistic
design, especially if it could be done at compile time instead. In any
case, I hope that if language features are deprecated in the future,
something better than an obscure documentation note might be found.
--
Glenn Maynard