C++//递增运算符重载

 1 #include <iostream>
 2 #include <string>
 3 using namespace std;
 4
 5 //重载递增运算符
 6
 7 //自定义整形
 8 class MyInteger
 9 {
10   friend    ostream& operator<<(ostream& cout, MyInteger myint);
11 public:
12     MyInteger()
13     {
14         m_Num = 0;
15     }
16
17     //重载 前置++运算符   返回引用为了对一个数据进行++
18     //返回引用
19     MyInteger& operator++()
20     {
21
22         //先进行 ++运算
23         m_Num++;
24
25         //再将自身作为返回
26         return *this;
27     }
28
29
30     //重载后置++运算符
31     //void operator++(int)   int 代表占位参数，可以用于区分前置喝后置递增
32     //返回值
33     MyInteger operator++(int)
34     {
35         //先记录当时结果
36         MyInteger temp = *this;
37
38         //后 递增
39         m_Num++;
40         //最后将结果返回
41         return temp;
42     }
43
44
45 private:
46     int m_Num;
47 };
48
49 //重载 <<运算符
50 ostream& operator<<(ostream& cout, MyInteger myint)
51 {
52     cout << myint.m_Num;
53     return cout;
54 }
55
56
57 void test01()
58 {
59     MyInteger myint;
60
61     cout << ++(++myint) << endl;    //2
62     cout << myint << endl;          //2
63 }
64
65 void test02()
66 {
67     MyInteger myint;
68
69     cout << myint++ << endl;  //0
70
71     cout << myint<< endl;     //1
72
73 }
74
75
76 int main()
77 {
78     test01();
79     test02();
80 }