C++加号运算符重载

运算符重载概念：
对已有的运算符重新定义，赋予其另一种功能，以适应不同的数据类型

加号运算符重载：
1.成员函数重载加号：

#include <iostream>
using namespace std;//加号运算符重载//1.成员函数重载+号class Person {public://1.成员函数重载+号Person operator+(Person &p) {Person temp;temp.m_A = this->m_A + p.m_A;temp.m_B = this->m_B + p.m_B;return temp;}int m_A;int m_B;
};void test01() {Person p1;p1.m_A = 10;p1.m_B = 10;Person p2;p2.m_A = 10;p2.m_B = 10;Person p3 = p1 + p2;cout << "p3.m_A = " << p3.m_A << endl;cout << "p3.m_B = " << p3.m_B << endl;}int main() {test01();return 0;
}

成员函数重载本质调用：
Person p3 = p1.operator+(p2);

2.全局函数重载加号：

#include <iostream>
using namespace std;//加号运算符重载class Person {public:int m_A;int m_B;
};//2.全局函数重载+号
Person operator+(Person &p1, Person &p2) {Person temp;temp.m_A = p1.m_A + p2.m_A;temp.m_B = p1.m_B + p2.m_B;return temp;
}void test01() {Person p1;p1.m_A = 10;p1.m_B = 10;Person p2;p2.m_A = 10;p2.m_B = 10;Person p3 = p1 + p2;cout << "p3.m_A = " << p3.m_A << endl;cout << "p3.m_B = " << p3.m_B << endl;}int main() {test01();return 0;
}

全局函数重载本质调用：
Person p3 = operator+(p1,p2);

运算符重载也可以发生函数重载
代码如下：

#include <iostream>
using namespace std;//加号运算符重载class Person {public:int m_A;int m_B;
};//2.全局函数重载+号
Person operator+(Person &p1, Person &p2) {Person temp;temp.m_A = p1.m_A + p2.m_A;temp.m_B = p1.m_B + p2.m_B;return temp;
}//函数重载的版本
Person operator+(Person &p1, int num) {Person temp;temp.m_A = p1.m_A + num;temp.m_B = p1.m_B + num;return temp;
}void test01() {Person p1;p1.m_A = 10;p1.m_B = 10;Person p2;p2.m_A = 10;p2.m_B = 10;Person p3 = p1 + p2;Person p4 = p1 + 100;cout << "p3.m_A = " << p3.m_A << endl;cout << "p3.m_B = " << p3.m_B << endl;cout << "p4.m_A = " << p4.m_A << endl;cout << "p3.m_B = " << p4.m_B << endl;}int main() {test01();return 0;
}