1 #include <iostream>
2 using namespace std;
3
4 class Good
5 {
6 public:
7 int member;
8 Good(int a): member(a)
9 {
10 cout << "调用构造" << endl;
11 }
12 void show()
13 {
14 cout << member << endl;
15 }
16 Good operator+(const Good& obj)
17 {
18 return Good(member - obj.member);
19 }
20
21 friend ostream& operator<<(ostream& os, Good& obj)
22 {
23 os << obj.member << "运算符重载" << endl;
24
25 return os; //这句话关键，便于重复调用
26 }
27 };
28
29 int main(int argc, char *argv[])
30 {
31 Good a(10), b(20);
32 Good c = a + b;
33 cout << c;
34 c.show();
35 return 0;
36 }
