c++ 运算符重载 (cin cout << >>)

// <<  >> 运算符重载 写成全局函数

// cin cout 对应类型 istream ostream
// cout << classA << endl; 

#include <iostream>

using namespace std;

class myClass
{
public:
    int m_c;
    int m_d;
    myClass(int a, int b):m_a(a), m_b(b) {};
    void set_number(int a, int b){ this->m_c = a; this->m_d = b;}

    // friend ostream& operator<<(ostream& out, myClass my); // 友元函数 访问私有成员

private:
        int m_a;
        int m_b;
};

ostream& operator<<(ostream& out, myClass my)
{
    out << "c:" << my.m_c << "  d:" << my.m_d << endl;
    // out << "a:" << my.m_a << "d:" << my.m_b << endl; // 私有成员 函数要作为友元函数
    return out;
}

istream& operator>>(istream& in, myClass& my) // 需要修改my的内容 引用传参
{
    in >> my.m_c >> my.m_d;
    return in;
}

int main()
{
    myClass my(1,1);
    my.set_number(12,34);

    cin >> my;

    cout << my << endl;

    return 0;
}