33_类与对象_运算符重载_03.cpp

#include <iostream>
using namespace std;

// 递增运算符重载
// 可以由此实现自己的整型数据（本课案例）

class MyInteger
{
    friend ostream &operator<<(ostream &cout, MyInteger myint);

public:
    MyInteger()
    {
        m_Num = 0;
    }

    // 重载前置++运算符
    MyInteger &operator++()
    {
        m_Num++;
        return *this;
    }

    // 重载后置++运算符
    MyInteger operator++(int) // int 为占位参数，可以用于区分前置和后置递增
    {
        MyInteger temp = *this;
        m_Num++;
        return temp;
    }

private:
    int m_Num;
};

// 重载 << 运算符
ostream &operator<<(ostream &cout, MyInteger myint)
{
    cout << myint.m_Num;
    return cout;
}

void test01()
{
    MyInteger myint;
    cout << ++myint << endl;
}

void test02()
{
    MyInteger myint;
    cout << myint++ << endl;
    cout << myint << endl;
}

int main()
{
    // test01();
    test02();
    return 0;
}