运算符重载(加号)

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

  • 方法: 返回值 operator +（形参列表）

    （1）通过成员函数重载 + 号

    （2）全局函数重载 + 号

示例：

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#include<iostream>
using namespace std;
class Person {
public:
	int m_a;
	int m_b;
	Person() {
	}
	Person(int a, int b):m_a(a),m_b(b){}
	//通过成员函数重载 + 号
	Person operator + (Person &p1) {
		Person temp;
		temp.m_a = this->m_a + p1.m_a;
		temp.m_b = this->m_b + p1.m_b;
		return temp;
	}
};
//全局函数重载
//Person operator + (Person& p1, Person& p2) {
//	Person temp;
//	temp.m_a = p1.m_a + p1.m_a;
//	temp.m_b = p2.m_b + p1.m_b;
//	return temp;
//}
void test01() {
	Person p1(10,10);
	Person p2(10,10);
	Person p3 = p1 + p2;
	//成员函数调用本质：Person p3 = p1.operator+(p2);
	cout << p3.m_a << " " << p3.m_b << endl;
	Person p4 = p1 + p2;
	//全局函数本质调用：Person p4 = operator+(p1,p2);
	cout << p3.m_a << " " << p3.m_b << endl;
}
int main() {
	test01();
	return 0;
}
  • 运算符重载也可以实现函数重载
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Person operator + (Person& p1, Person& p2) {
}
Person operator + (Person& p1, int a){
}