c++ 調用lua 可傳兩個參數的 重載方法

int LuaEngine::executeGlobalFunction(const char* functionName, int numArgs)
{
    lua_State *luaState = LuaEngine::getInstance()->getLuaStack()->getLuaState();
    
    lua_getglobal(luaState, functionName);       /* query function by name, stack: function */
    if (lua_isfunction(luaState, -1))
    {
        if (numArgs > 0)
        {
            lua_insert(luaState, -(numArgs + 1));                        /* stack: ... func arg1 arg2 ... */
        }
        
        int traceback = 0;
        lua_getglobal(luaState, "__G__TRACKBACK__");                     /* stack: ... func arg1 arg2 ... G */
        if (!lua_isfunction(luaState, -1))
        {
            lua_pop(luaState, 1);                                        /* stack: ... func arg1 arg2 ... */
        }
        else
        {
            traceback = -(numArgs + 2);
            lua_insert(luaState, traceback);                             /* stack: ... G func arg1 arg2 ... */
        }
        
        int error = 0;
        error = lua_pcall(luaState, numArgs, 1, traceback);              /* stack: ... ret */
        if (error)
        {
            if (traceback == 0)
            {
                CCLOG("[LUA ERROR] %s", lua_tostring(luaState, - 1));    /* stack: ... error */
                lua_pop(luaState, 1); // remove error message from stack
            }
            return 0;
        }
        
        // get return value
        int ret = 0;
        if (lua_isnumber(luaState, -1))
        {
            ret = lua_tointeger(luaState, -1);
        }
        else if (lua_isboolean(luaState, -1))
        {
            ret = lua_toboolean(luaState, -1);
        }
        
        lua_pop(luaState, 1); // remove return value from stack
        return ret;
    }
    else
    {
        CCLOG("[LUA ERROR] name '%s' does not represent a Lua function", functionName);
        lua_pop(luaState, 1);
        lua_pop(luaState, numArgs); // remove args from stack
        return 0;
    }
    
}