c++递增运算符重载

C++递增运算符++重载
作用:实现自定义类型的++操作。
　　operator++(){}

 1 #include<iostream>
 2 using namespace std;
 3 class Myinterge
 4 {
 5 public:
 6     friend ostream& operator<<(ostream& cout, Myinterge& p1);//友元
 7     Myinterge() 
 8     {
 9         m_A = 0;
10     }
11     Myinterge(int a)
12     {
13 
14         m_A = a;
15     }
16 
17     //重载前置++
18     Myinterge & operator++()//++运算符重载返回operator++(){}
19                            //引用是保证始终在同一个内存地址中进行+1操作
20     {
21         m_A++;
22         return *this;//返回自身
23     }
24     //重载后置++
25     Myinterge operator++(int)//int代表占位参数，用于区分前置++和后置++重载
26     {
27         Myinterge tem = *this;//先记录当前值
28         m_A++;
29         return tem;//返回+1之前的值
30     }
31 
32 private:
33     int m_A;
34 };
35 
36 ostream & operator<<(ostream& cout, Myinterge& p1)//全局左移运算符重载operator<<(){}
37 {
38     cout << p1.m_A;
39     return cout;
40 }
41 
42 
43 
44 int main()
45 {
46 
47     Myinterge p1(10);
48     cout << ++p1 << endl;
49 }

总结：前置++返回引用，后置++返回值，

posted @ 2021-02-17 22:28  两天阿来  阅读(65)  评论(0)    收藏  举报