后++，赋值操作符重载，构造函数调用才会产生对象 

 #include<iostream>
 2 using namespace std;
 3 class test{
 4 int mvalue;
 5 public:
 6         test(int i){
 7                 cout << "test(int i)=" << i << endl;
 8                 mvalue = i;
 9         }
10         int value(){
11                 return mvalue;
12         }
13         test& operator++(){
14                 ++mvalue;
15                 return *this;
16         }
17         //后++
18         test operator++(int){
19                 cout << "test operator++" << endl;
20                 test ret(mvalue);
21                 mvalue++;
22                 cout << "mvalue=" << mvalue << endl;
23                 return ret;
24         }
25 };
26 int main(){
27         test t(0);         //test(int i)=0
28         test tt = t++;     //test operator ++; test(int i)=0
29         cout << tt.value() << endl;
30         cout << t.value() << endl;
31         return 0;
32 //运行结果
33 test(int i)=0
34 test operator++
35 test(int i)=0
36 0
37 1

 

posted @ 2019-11-18 21:35  刘大侠GG_B  阅读(129)  评论(0)    收藏  举报