Re: Inheritance

[Christoph Schreiber <luky0711@...>]

>> Also, please do not post your questions as 
>> follow-ups to unrelated mailing list threads.

Oops. Sorry.

Here is the full function. I don't understand how lua knows which base class to call. I return only the method name. I always thougt the return value (1 in this case) tells lua how many values I return on the stack.

int ChildClass::index(lua_State* L)
{
    // searches for the method in child's metatable
    const char* key = luaL_checkstring(L, 2);
    lua_getmetatable(L, 1);
    lua_getfield(L, -1, key);

    // if it doesn't find the method it calls 
    // the method of the base class
    if(lua_isnil(L, -1))
    {
        luaL_getmetatable(L, BaseClass::classId);
        lua_getfield(L, -1, key);
    }
    return 1;
}

--- Florian Weimer <fw@deneb.enyo.de> schrieb am So, 9.5.2010:

> Von: Florian Weimer <fw@deneb.enyo.de>
> Betreff: Re: Inheritance
> An: lua@bazar2.conectiva.com.br
> Datum: Sonntag, 9. Mai, 2010 20:18 Uhr
> * Christoph Schreiber:
> 
> > The following code works. But I don't understand why.
> That drives me nuts.
> >
> > int ChildClass::index(lua_State* L)
> > {
> >     const char* key =
> luaL_checkstring(L, 2);
> >     lua_getmetatable(L, 1);
> >     lua_getfield(L, -1, key);
> >     if(lua_isnil(L, -1))
> >     {
> >     
>    luaL_getmetatable(L, Base::classId);
> >         lua_getfield(L,
> -1, key);
> >     return 1;
> > }
> 
> A closing brace is missing in that snippet.  Perhaps
> you did not copy
> the full function?  And you shold really tell us what
> is so surprising
> to you.
> 
> Also, please do not post your questions as follow-ups to
> unrelated
> mailing list threads.
>