c++ - 复制队列导致段错误

Question

我有一个函数可以追溯到导致段错误，但我似乎找不到我做错了什么。我正在尝试使用打印语句来查找 seg 错误发生的位置，但显然该函数运行没有问题 THEN seg 错误。这是功能：

//note all of the cout statements are executed
template<class Type>
void linkedQueue<Type>::copyQueue(const linkedQueue<Type>& otherQueue)
{
    //if the queue is in use, delete its contents
    if(!isQueueEmpty())
        initializeQueue();
    if(otherQueue.isQueueEmpty()) {
        queueFront = NULL;
        queueRear = NULL;
        count = 0;
    } else {
        queueNodeType<Type> *current, *newNode, *last;
        current = otherQueue.queueFront;

        queueFront = new queueNodeType<Type>;
        queueFront->info = current->info;
        queueFront->link = NULL;

        last = queueFront;
        current = current->link;
        while(current != NULL) {
            newNode = new queueNodeType<Type>;

            newNode->info = current->info;
            newNode->link = NULL;
            queueRear = newNode;
            last->link = newNode;
            last = newNode;
            cout << current->info << endl;
            current = current->link;
        }
        cout << "here?\n";
        count = otherQueue.count;
    }
    cout << "ended\n";
}

此函数在 main 中调用：

linkedQueue<int> queue4(queue3);

seg 错误在这条线被调用后直接发生，我可能做错了什么？

ps 复制构造函数只是将 queueFront 设置为 NULL 并调用复制函数。