Re: Clearing tables

[Wim Couwenberg <w.couwenberg@...>]

> However this 'non-defined index' problem begins to worry me. What kind of
> index is this, and how do you prevent it? Moreover, would it be possible to
> port Adam D. Moss' version to C?

Don't worry about the non-defined index problem (if it can
be called a problem at all.)  It is rather subtle and
probably of no consequence under normal circumstances.  The
ADM version can be rewritten as follows: 

/* suppose that the table is at stack index "table" */

void zap_table(lua_State *L, int table)
{
     lua_pushnil(L);

     while (lua_next(L, table))
     {
           lua_pop(L, 1);  /* pop value */
           lua_pushvalue(L, -1);  /* duplicate the key */
           lua_pushnil(L);
           lua_settable(L, table);  /* zap the key */
     }
}


Bye,
Wim