运算符重载
运算符重载概念：对已有的运算符重新进行定义，赋予其另一种功能，以适应不同的数据类型
4.5.1 加号运算符重载
作用：实现两个自定义数据类型相加的运算
成员函数加法重载运算
1 #include <iostream>
2 using namespace std;
3 int a = 10;
4 int b = 10;
5 int c = a + b;
6 class person
7 {
8 public:
9 int m_a;
10 int m_b;
11 person operator+ (person& p)
12 {
13 person tempt;
14 tempt.m_a = m_a + p.m_a;
15 tempt.m_b = m_b + p.m_b;
16 return tempt;
17 }
18 };
19 int main()
20 {
21 person p1;
22 p1.m_a = 10;
23 p1.m_b = 10;
24 person p2;
25 p2.m_a = 10;
26 p2.m_b = 10;
27 person p3 = p1 + p2; //本质上是 ：p1.operaor+(p2)
28 cout <<"p1.m_a +p2.m_a = " << p3.m_a << endl 29 << "p1.m_b +p2.m_b = " << p3.m_b << endl; 30 }
全局函数加法重载运算
1 #include <iostream>
2 using namespace std;
3 int a = 10;
4 int b = 10;
5 int c = a + b;
6 class person
7 {
8 public:
9 int m_a;
10 int m_b;
11 };
12 person operator+ (person& p1, person& p2)
13 {
14 person tempt;
15 tempt.m_a = p1.m_a + p2.m_a;
16 tempt.m_b = p1.m_b + p2.m_b;
17 return tempt;
18 }
19 int main()
20 {
21 person p1;
22 p1.m_a = 10;
23 p1.m_b = 10;
24 person p2;
25 p2.m_a = 10;
26 p2.m_b = 10;
27 person p3 = p1 + p2 ;//本质上是operator+(p1,p2)
28 cout <<"p1.m_a +p2.m_a = " << p3.m_a << endl 29 << "p1.m_b +p2.m_b = " << p3.m_b << endl; 30 }
运算符的函数重载
1 #include <iostream>
2 using namespace std;
3 int a = 10;
4 int b = 10;
5 int c = a + b;
6 class person
7 {
8 public:
9 int m_a;
10 int m_b;
11 };
12 person operator+ (person& p1, int num )
13 {
14 person tempt;
15 tempt.m_a = p1.m_a + num ;
16 tempt.m_b = p1.m_b + num;
17 return tempt;
18 }
19 int main()
20 {
21 person p1;
22 p1.m_a = 10;
23 p1.m_b = 10;
24 person p3 = p1 + 10;
25 cout <<"p1.m_a +num = " << p3.m_a << endl
26 << "p1.m_b +num = " << p3.m_b << endl;
27 }
总结1：对于内置的数据类型（比如int类型）的表达式的的运算符是不可能改变的
标签：p2,10,p1,person,int,运算符,对象,tempt,重载 From： https://www.cnblogs.com/zaiyewujiang/p/16651656.html总结2：不要滥用运算符重载（比如加法写成减法等等，会让人看不懂）