c++中重载复制运算符报错

在C++ primer plus 第六版中，程序清单12.10 queue.h，在Queue类的私有域中重载了赋值运算符，在编译时报错，我将这个赋值运算符函数注释后，编译通过。附上我手敲的代码

12.10_queue.h

#ifndef QUEUE_H_
#define QUEUE_H_

class Customer
{
private:
    long arrive;
    int processtime;
public:
    Customer(){arrive = processtime = 0;}

    void set(long when);
    long when() const {return arrive;}
    int ptime() const {return processtime;}
};

typedef Customer Item;

class Queue
{
private:
    struct Node { Item item; struct Node *next;};
    enum {Q_SIZE = 10};

    Node *front;
    Node *rear;
    int items;
    const int qsize;

    Queue(const Queue &q) : qsize(0)
    {
    }
    Queue& opetator=(const Queue &q)
    { 
        return *this;
    }

public:
    Queue(int qs = Q_SIZE);
    ~Queue();
    bool isempty() const;
    bool isfull() const;
    int queuecount() const;
    bool enqueue(const Item &item);
    bool dequeue(Item &item);
};

#endif

12.11_queue.cpp

#include "12.10_queue.h"
#include <iostream>

Queue::Queue(int qs) : qsize(qs)
{
    front = rear = 0;
    items = 0;
}

Queue::~Queue()
{
    Node *temp;
    while(front != NULL)
    {
        temp = front;
        front = front->next;
        delete temp;
    }
}

bool Queue::isempty() const
{
    return items == 0;
}

bool Queue::isfull() const
{
    return items == qsize;
}

int Queue::queuecount() const
{
    return items;
}

bool Queue::enqueue(const Item &item)
{
    if(isfull())
    {
        return false;
    }
    Node *add = new Node;
    add->item = item;
    add->next = NULL;
    items++;
    if(front == NULL)
    {
        front = add;
    }
    else
    {
        rear->next = add;
    }
    rear = add;
    return true;
}

bool Queue::dequeue(Item &item)
{
    if(front == NULL)
    {
        return false;
    }
    item = front->item;
    items--;
    Node *temp = front;
    front = front->next;
    delete temp;
    if(items == 0)
    {
        rear = NULL;
    }
    return true;
}

void Customer::set(long when)
{
    processtime = std::rand() % 3 + 1;
    arrive = when;
}

12.12_bank.cpp

#include <iostream>
#include <cstdlib>
#include <ctime>
#include "12.10_queue.h"

const int MIN_PER_HR = 60;

bool newcustomer(double x);

int main()
{
    using std::cin;
    using std::cout;
    using std::endl;
    using std::ios_base;
    
    std::srand(std::time(0));

    cout << "hello world" << endl;
    return 0;
}

编译命令 g++ 12.10_queue.h 12.11_queue.cpp 12.12_bank.cpp -o queue -std=c++11
编译出错提示如下：

希望有先生能帮忙解答，不胜感激

我想知道的是重载赋值运算符函数为什么这样子写会出错，谢谢啦

在vscode中他提示我这些信息

先把operator拼对再找找别的问题?