循环（for语句）输出中，it->m_Name前面的左移运算符为什么会报错，请放到编译器中调试

#include<iostream>
#include <set>
#include <string>
using namespace std;
//set容器排序 存放自定义数据类型
class Person
{
public:
    Person(string name, int age)
    {
        this->m_Name = name;
        this->m_Age = age;
    }
    string m_Name;
    int m_Age;
};
class comparePerson
{
public:
    bool operator()(const Person& p1, const Person& p2)
    {
        //按照年龄进行降序
        return p1.m_Age > p2.m_Age;
    }
};
void test01()
{
    set<Person,comparePerson> s;
    //创建Person对象
    Person p1("刘备", 24);
    Person p2("关羽", 28);
    Person p3("张飞", 25);
    Person p4("赵云", 21);

    s.insert(p1);
    s.insert(p2);
    s.insert(p3);
    s.insert(p4);

    for (set<Person,comparePerson>::iterator it = s.begin();it != s.end();it++)
    {
        cout < "姓名： " << it->m_Name << "年龄： " << it->m_Age;
    }

}

int main()
{
    test01();
}

![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/885162669626154.png)