C++一元运算符重载“++”前置与后置详解

#include <iostream>
using namespace std;

class Point{
public:
// 构造函数
Point() {
x = 0;
y = 0;
}

Point(double xx, double yy) {
x = xx;
y = yy;
}

// 输出坐标
void print() {
cout << "(" << x << ", " << y << ")" << endl;
}

// 前置重载，无参数，返回对象的引用
Point& operator++() {
++x;
++y;
return *this;
}

// 后置重载，整数型参数,返回对象
Point operator++(int) {
Point temp(x, y);
x++;
y++;
return temp;
}

private:
double x;
double y;
};

int main()
{
// 定义对象
Point p(12, 19);

p.print();
++p;
p.print();
p++;
p.print();

return 0;
}

运行结果:
(12, 19)
(13, 20)
(14, 21)