赋值运算符=重载

 1 #include<iostream>
 2 using namespace std;
 3 class Persion
 4 {
 5 public:
 6     Persion(int a)
 7     {
 8         m_A = new int(a);//在堆区开辟空间
 9     }
10     ~Persion()
11     {
12         if (m_A != NULL)
13         {
14             delete this->m_A;
15             m_A = NULL;
16         }
17     }
18     Persion& operator=(Persion &p)//赋值符=重载
19     {
20         if (m_A != NULL)
21         {
22             delete this->m_A;
23             p.m_A - NULL;
24         }
25         m_A = new int(*p.m_A);
26         return *this;
27     }
28     int *m_A;
29 };
30 ostream& operator<<(ostream &cout,Persion &p1) //
31 {
32     cout << *p1.m_A;
33     return cout;
34 
35 }
36 int main()
37 {
38     Persion p1(10);
39     Persion p2(20);
40     Persion p3(30);
41     p3 = p2 = p1;
42     cout << p1 << endl;
43     cout << p2 << endl;
44     cout << p3 << endl;
45     system("pause");
46     return 0;
47  }