c++左移运算符重载<<

c++左移运算符重载<<

作用：可以输出自定义类型数据　　只能通过全局函数来实现不能通过类成员函数来实现无法使cout在左侧

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



class Persion
{
public:
    friend ostream& operator<<(ostream& cout, Persion& p1);//保证operator<<()函数能访问到private和proteced权限的成员
    
    Persion(string name, int Age,string Sex)
    {
        m_Name = name;
        m_Age = Age;
        m_Sex = Sex;
    }
private:
    string m_Name;//姓名
    int m_Age;//年龄
    string m_Sex;
};
//链式编程思想
 ostream & operator<<(ostream &cout,Persion &p1)//只能通过全局函数实现左移操作符重载，
{                                                                    
     cout << p1.m_Name << "  " << p1.m_Age << "  " << p1.m_Sex;
     return cout;//返回cout 才能保证cout始终在左边
}

int main()
{

    Persion p1("张三", 45,"男");
    cout << p1;    //cout << p1  相当于operator<<(cout,p1);
    cout<< endl;

    system("pause");
    return 0;
}