双向链表删除C++中的偶数

我正在尝试从双向链表中删除所有偶数。

我考虑过这些情况：

1. 空列表
2. 开头为偶数，
3. 末尾的偶数
4. 列表中间的偶数
5. 偶数不在列表中

我下面的代码无法正常工作：

void DoublyList::deleteEvens()
{
    if (first == NULL) {
        cerr << "Empty List" << endl;
    }

    else {
        Node *current = first;
        bool found = false;
        while (current != NULL && (!found)) {
            Node *tCurrent = current;
            if (current->getNextLink() == NULL) {
                if (current->getData() % 2 == 0) {
                    first = NULL;
                    last = NULL;
                    delete current;
                    current = NULL;
                    count = 0;
                }
                else {
                    cerr << "Not in the list" << endl;
                    found = true;
                }
            }
            else if (current == first && current->getData() % 2 == 0) {
                first = first -> getNextLink();
                first->setPreviousLink(NULL);
                current = current->getNextLink();
                delete tCurrent;
                tCurrent = NULL;
                -- count;
            }
            else if (current == last && current->getData() % 2 == 0) {
                last = last->getPreviousLink();
                last->setNextLink(NULL);
                delete current;
                current = NULL;
                -- count;
            }
            else if (current->getData() % 2 == 0) {
                current->getPreviousLink()->setNextLink(current->getNextLink());
                current->getNextLink()->setPreviousLink(current->getPreviousLink());
                current = current->getNextLink();
                delete tCurrent;
                tCurrent = NULL;
            }
            else {
                current = current->getNextLink();
            }
        }
    }
}