RE: [ANNOUNCE] Lua 5.0 (beta) now available

[Ignacio Castaño <castanyo@...>]

Benoit Germain wrote: 
> Another solution, much more straightforward, would be that LUA had
> something
> equivalent to lua_pushupvalues() in its API, but instead of reading the
> upvalues of the current call frame, being able to get the upvalues of a
> cclosure at a given stack index.

Some time ago I posted:

LUA_API void lua_getupvalue (lua_State *L, int index, int upvalue) {
  StkId o;
  lua_lock(L);
  o = luaA_indexAcceptable(L, index);
  if( o==NULL || !iscfunction(o) )
    setnilvalue(L->top);
  else {
    Closure *cl = clvalue(o);
    if( upvalue<0 || upvalue >= cl->c.nupvalues )
      setnilvalue(L->top);
 else
      setobj(L->top, &cl->c.upvalue[upvalue]);
  }
  api_incr_top(L);
  lua_unlock(L);
}


Ignacio Castaño
castanyo@yahoo.es


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