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
1.成员函数实现 号运算符重载
代码语言：javascript复制class Person
{
public:
Person() {};
Person(int a, int b)
{
this->m_A = a;
this->m_B = b;
}
//1.成员函数实现 号运算符重载
Person operator (const Person& p) {
Person temp;
temp.m_A = this->m_A p.m_A;
temp.m_B = this->m_B p.m_B;
return temp;
}
public:
int m_A;
int m_B;
};
void test() {
Person p1(10, 10);
Person p2(20, 20);
//1.成员函数方式
Person p3 = p2 p1; //相当于 p2.operaor (p1)
cout << "mA:" << p3.m_A << " mB:" << p3.m_B << endl;
}
int main() {
test();
system("pause");
return 0;
}2.全局函数实现 号运算符重载
代码语言：javascript复制class Person
{
public:
Person() {};
Person(int a, int b)
{
this->m_A = a;
this->m_B = b;
}
public:
int m_A;
int m_B;
};
//2.全局函数实现 号运算符重载
Person operator (const Person& p1, const 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 test() {
Person p1(10, 10);
Person p2(20, 20);
//2.全局函数方式
Person p3 = p2 p1; //相当于 operaor (p1,p2)
cout << "mA:" << p3.m_A << " mB:" << p3.m_B << endl;
}
int main() {
test();
system("pause");
return 0;
}3.运算符重载 可以发生函数重载
代码语言：javascript复制class Person
{
public:
Person() {};
Person(int a, int b)
{
this->m_A = a;
this->m_B = b;
}
public:
int m_A;
int m_B;
};
//3.运算符重载 可以发生函数重载
Person operator (const Person& p2, int val) //注意全局函数的运算重载的函数名是编译器给的。
{
Person temp;
temp.m_A = p2.m_A val;
temp.m_B = p2.m_B val;
return temp;
}
void test() {
Person p1(10, 10);
Person p2(20, 20);
//3.运算符重载也可以发生函数重载，如下person int
Person p4 = p3 10; //相当于 operator (p3,10)
cout << "mA:" << p4.m_A << " mB:" << p4.m_B << endl;
}
int main() {
test();
system("pause");
return 0;
}总结1：对于内置的数据类型的表达式的的运算符是不可能改变的，即1 1=2不可变，不会为3.
总结2：不要滥用运算符重载，即你写的函数名是加法，可是函数的实现是减法，可以运行但是这叫滥用。
