C++递增运算符的重载

#include 
using namespace std;

//自定义整型
class MyInteger 
{
   friend ostream& operator << (ostream& cout, MyInteger myint);
public:
    MyInteger()
    {
        m_Num = 0;
    }
    //重载前置++运算符,返回引用是为了一直对一个数据进行递增操作
    MyInteger& operator++()
    {
        //先进行++运算
        m_Num++;
        //再将自身做返回
        return *this;
    }

    //重载后置++运算符
    //int代表的是占位参数，用于区分前置后置递增
    MyInteger operator++(int)
    {
        //先记录当时结果
        MyInteger temp = *this;
       
        //后递增
        m_Num++;
        //最后将记录的结果返回
        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;
    cout << myint << endl;
}

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

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

输出结果为2，2，0，1