Re: lua_getupvalue question

[Philipp Janda <siffiejoe@...>]

Am 03.12.2013 02:00 schröbte Andrew Starks:
> On Monday, December 2, 2013, Sean Conner wrote:
>
> > It was thus said that the Great Andrew Starks once stated:
> > > Given the following:
> > >
> > > ```
> > > int iter(lua_State *L){
> > >    ///what to do here?
> > >      lua_pushinteger(L, (lua_Integer) luaL_checkint(L,
> > > lua_upvalueindex(1)) + 1); //I can get the upvalue...
> > >      // how do I set it?
> > >      //lua_getupvalue (lua_State *L, int funcindex, int n); //doesn't
> > > seem like the correct function because iter is not on the stack, at
> > > this point.
> > > }
> > >
> > > int factory(lua_State *L){
> > >    lua_pushnumber(L, 0);
> > >    lua_pushcclosure(L, iter, 1);
> > >    return 1;
> > > }
> > >
> > > ```
> >
> >    You want to call ua_upvalueindex().  That will return an index you can
> > pass to other Lua functions that take an index.  It's described in section
> > 3.4 of Lua 5.1 and section 4.4 of Lua 5.2.
> >
> >    -spc
> I messed up. It's setupvalue not get.

That may be true, but given your description you probably wanted 
`lua_replace(L, lua_upvalueindex(1))` anyway as Sean suggested (sort of) ...

> -Andrew

Philipp