加号运算符重载（1）

 1 #include <iostream>
 2 using namespace std;
 3 
 4 class Person
 5 {
 6 public:
 7 
 8     //1.成员函数重载加号运算符
 9     /*Person operator+(Person &p)
10     {
11         Person temp;
12         temp.m_A = this->m_A + p.m_A;
13         temp.m_B = this->m_B + p.m_B;
14         return temp;
15     }*/
16 
17     int m_A;
18     int m_B;
19 
20 };
21 
22 //2.全局函数重载加号运算符
23 Person operator+(Person &p1,Person &p2)
24 {
25     Person temp;
26     temp.m_A = p1.m_A + p2.m_A;
27     temp.m_B = p1.m_B + p2.m_B;
28     return temp;
29 }
30 
31 //函数重载的版本
32 Person operator+(Person &p1, int num)
33 {
34     Person temp;
35     temp.m_A = p1.m_A + num;
36     temp.m_B = p1.m_B + num;
37     return temp;
38 }
39 
41 void test_01(void)
42 {
43     Person p1;
44     p1.m_A = 11;
45     p1.m_B = 11;
46 
47     Person p2;
48     p2.m_A = 10;
49     p2.m_B = 10;
50 
51     //成员函数重载本质调用
52     //Person p3 = p1.operator+(p2);
53 
54     //全局函数重载本质调用
55     //Person p3 = operator+(p1, p2);
56 
57     Person p3 = p1 + p2;//从这里开始构造加号运算符重载函数，返回值为对象，传入一个引用对象就可以了
58 
59     //运算符重载，也可以发生函数重载
60     Person p4 = p1 + 100;
61 
62 
63     cout << p3.m_A << endl;
64     cout << p3.m_B << endl;
65 
66     cout << p4.m_A << endl;
67     cout << p4.m_B << endl;
68 }
69 
70 int main(void)
71 {
72     test_01();
73 
74     system("pause");
75     return 0;
76 }