Re: Identifiers of tables on Stack from C/C++

[Marc Balmer <marc@...>]

Am 30.05.2011 14:53, schrieb Joerg Walter:
> Tables are objects in the LUA world. I'm looking for an identifier for the C world. If I wanted to write a table traverser in LUA I would put the table itself as a key into another table to remember that this table has been visited.
> I'm looking for the c/c++ equivalent: Putting the table id into an std::set.
>
> My ideas:
>
> 1. Using the registry mechanism. But I don't know how this behaves with references on tables.
>
> 2. Simply using lua_topointer(): Same question

You can always get the reference of an object in a table using luaL_ref. 
 When I have to do similar things as you want to accomplish, I keep the 
tuple reference of the object/reference of the table the object is part of.

> -------- Original-Nachricht --------
> > Datum: Mon, 30 May 2011 09:20:10 -0300
> > Von: "Ignacio Burgueño"<ignaciob@inconcertcc.com>
> > An: Lua mailing list<lua-l@lists.lua.org>
> > Betreff: Re: Identifiers of tables on Stack from C/C++
>
> > On Mon, May 30, 2011 at 4:05 AM, Joerg Walter<joerg-walter@gmx.de>  wrote:
> >
> > > Hi
> > >
> > > I'd like to cylce through a table variable from a C function. Since
> > tables
> > > can contain references on tables and since this can result in cyclic
> > > structures I need to know somehow that I'm am stuck in a cycle at some
> > > point. I have save remember which table I already have visited. What is
> > an
> > > appropriate identifier of a table and how can I retrieve it from C?
> > Can't you use the table itself as the key?