关于重载==运算符的问题

Question

如下代码所示，不理解我定义的Person类里的==重载函数为什么这么写？ bool operator==(const Person &p)中的this->m_Age和o.m_Age搞糊涂了

#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
using namespace std;

//自定义数据类型
class Person
{
public:
    Person(string name, int age)
    {
        this->m_Name = name;
        this->m_Age = age;
    }
                //不理解下面这个重载函数，希望各位大佬帮我看看
    bool operator==(const Person &p)
    {
        //cout << "p.m_Age：" << p.m_Age << "\t this->m_Age：" << this->m_Age << endl;
        if (p.m_Age == this->m_Age)
        {
            return true;
        }

        else
        {
            return false;
        }
    }

    string m_Name;
    int m_Age;
};

class myPrint2
{
public:

    void operator()(const Person & p)
    {
        cout << "姓名：" << p.m_Name << "\t年龄：" << p.m_Age << endl;
    }
};

void test02()
{
    Person p1("aa", 10);
    Person p2("bb", 30);
    Person p3("cc", 20);
    Person p4("dd", 10);
    Person p5("ee", 40);
    Person p6("ff", 10);
    vector<Person>v;
    v.push_back(p1);
    v.push_back(p2);
    v.push_back(p3);
    v.push_back(p4);
    v.push_back(p5);
    v.push_back(p6);
    //将所有10替换为1000
    Person pOld("aa", 10);
    Person pNew("aa", 1000);
    cout << "替换前：" << endl;
    for_each(v.begin(), v.end(), myPrint2());
    cout << "\n替换后：" << endl;
    replace(v.begin(), v.end(), pOld, pNew);
    
    for_each(v.begin(), v.end(), myPrint2());
}

int main()
{
    //test01();
    test02();

    system("pause");
    return 0;
}

Answer 1

对着呢呀，比较两个人是否相等的时候，就是比较他们的年龄。p是传进来的对象，this是当前对象