// 存放类对象的数据 vector
#include <bits/stdc++.h>

using namespace std;

class Student
{
    friend ostream &operator<<(ostream &out, const Student &stu);

private:
    string name;
    int age;

public:
    Student(const string &name, int age)
    {
        this->name = name;
        this->age = age;
    }
};

ostream &operator<<(ostream &out, const Student &stu)
{
    out << "name: " << stu.name << ", age: " << stu.age;
    return out;
}

int main()
{
    vector<Student> v;
    v.push_back(Student("zhangsan", 20));
    v.push_back(Student("lisi", 21));
    v.push_back(Student("wangwu", 22));
    v.push_back(Student("zhaoliu", 23));

    v.pop_back(); // 删除最后一个元素

    // 创建迭代器
    vector<Student>::iterator it = v.end();
    while (it != v.begin())
    {
        cout << *(--it) << endl; // 重载了<<运算符
    }

    return 0;
}