Re: Create a new table based on an already existed table (through Lua or C API)?

[孙世龙 sunshilong <sunshilong369@...>]

>I think it's a difficult since I could not acquire the name which
>passes to registered C function.
It seems that I find a solution just now.

Comparing the pointer of the table (the one passed to foo_func) with
the `value`(which is contained in the aforementioned table) pointed
to.

On Thu, Jan 21, 2021 at 7:51 PM 孙世龙 sunshilong <sunshilong369@gmail.com> wrote:
>
> I see. Thank you.
> I remembered it(i.e _G['_G' == _G]).
>
> Where and when should I use the recursive tables?
> I think _G is a good answer to this question. :) Am I missing something?
>
> More importantly, how to find out the table is a  recursive table or
> not through C API?
> I think it's a difficult since I could not acquire the name which
> passes to registered C function.
>
> For example, I register int foo_func(struct lua_State* L) to Lua
> through lua_register().
> I could not know the argument passed to foo_func() is a recursive
> table or not when encountering `foo_func(_G)` in Lua script.
>
> On Thu, Jan 21, 2021 at 7:30 PM Sudipto Mallick <smallick.dev@gmail.com> wrote:
> >
> > Example:
> >
> >         local t = {}
> >         t.t = t
> >         assert((t == t.t) and (t.t == t.t.t) and (t.t.t == t.t.t.t))
> > -- and so on
> >
> > You remember _G, don't you?
> >
> >         assert(_G['_G'] == _G)
> >
> > --Sudipto Mallick