Re: unpack in lua5.1

[Rici Lake <lua@...>]

On 28-Nov-06, at 10:48 PM, al_lea wrote:

> hi,
>
> I'd just port some code from lua5.0 to 5.1 and found that unpack(arg) 
> doesn't
> work as expected.
>
> code sample:
> g_load_new =
> {
>   [1] = "arcaves.lua",
>   [4] = 1,
>   n = 4,
>  }
>
> function foo(...)
>  print(unpack(arg))
>  print(arg.n)
> end
>
> foo(unpack(g_load_new))
> -- end --
> in 5.0 the output is:
> arcaves.lua nil nil 1
> 4
>
> in 5.1 the output is:
> arcaves.lua
> 1
>
> Is there some way to make the unpack works well with nil holes?

Try:
  unpack(g_load_new, 1, g_load_new.n)

I don't quite understand why you're packing an array in order to unpack 
it in order to send it to a varargs function. If you want to find out 
how many arguments you received, use:
  select('#', ...)

If you want to convert ... to an array with explicit length, use:
  {n = select('#', ...), ...}

(which is essentially 5.0 compatibility)