Re: [ANN] Haxe Lua : compile Lua/LuaJIT script from Haxe 3.3

["Soni L." <fakedme@...>]

On 31/05/16 02:00 PM, Justin Donaldson wrote:
> On Tue, May 31, 2016 at 10:19 AM, Javier Guerra Giraldez 
> <javier@guerrag.com <mailto:javier@guerrag.com>> wrote:
>
>     On 31 May 2016 at 05:42, Justin Donaldson <jdonaldson@gmail.com
>     <mailto:jdonaldson@gmail.com>> wrote:
>     > it needs to track its length in order to accommodate nil values
>
>
>     The usual approach to store nil values in a table is to use your own
>     'pseudo nil' value.
>
>
> Consider creating an array [1,2,3], and then setting the index 100 to 
> 4.  The indexes 4-99 will still be nil. The length of that array 
> reported by maxn/# would still be indeterminate.  How do I resolve that?
With a little help from C, it's possible to create a very efficient 
coroutine-based nil-safe array. Just need a function exchange(index, 
value, ...) -> ... (that's a varargs and a varret, respectively), which 
changes the value in `...` at index `index` with `value` and returns the 
result. Everything else can be done from Lua. It works better as a 
stack, however.

Length operation is select('#', ...), push is `val, ...` and pop is 
`select(2, ...)`. See http://sprunge.us/CGCT

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