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struct EventListItem
    {
        EventListItem  *prev;
        EventListItem  *next;
        abstract_event *event;

        EventListItem() = default;

        EventListItem(abstract_event *event) : event(event) { }
    };

    struct EventList
    {
        EventListItem *terminator;

        EventList() {
            terminator = new EventListItem();
            terminator->prev = terminator;
            terminator->next = terminator;
        }

        ~EventList() {
            while (!this->empty()){
                this->pop_front();
            }
            delete terminator;
        }

        void push_back(EventListItem *item) {
            item->next             = this->terminator->prev;
            this->terminator->prev = item;
        }

        EventListItem *front() {
            return terminator->next;
        }

        void pop_front() {
            if (!empty()) {
                EventListItem *tmp = this->terminator->next;
                this->terminator->next = tmp->next;
                delete tmp;
            }
        }

        inline bool empty() {
            return this->terminator->prev == this->terminator->next;
        }
    };