1 先上代码
#include <iostream>
#include <string.h>
#include <unistd.h>
using namespace std;
class Point {
private:
int x;
int y;
public:
Point()
{
cout<<"Point()"<<endl;
}
Point(int x, int y) : x(x), y(y)
{
cout<<"Point(x,y)"<<endl;
}
Point(const Point &per)
{
cout<<"Point(copy)"<<endl;
x = per.x;
y = per.y;
}
~Point()
{
cout<<"~Point()"<<endl;
}
int getX(){ return x; }
int getY(){ return y; }
void setX(int x){ this->x = x; }
void setY(int y){ this->y = y; }
void printInfo()
{
cout<<"("<<x<<", "<<y<<")"<<endl;
}
/*+加法*/
Point operator+(Point &a)
{
Point n;
n.x = this->x+a.x;
n.y = this->y+a.y;
cout<<"operator+(Point &a)"<<endl;
return n;
}
Point operator++(int b)
{
Point n;
n.x = this->x++;
n.y = this->y++;
cout<<"p++"<<endl;
return n;
}
Point& operator++(void)
{
this->x++;
this->y++;
cout<<"++p"<<endl;
return *this;
}
friend ostream& operator<<(ostream& cout, Point &a);
};
/*这里是<<*/
ostream& operator<<(ostream& cout, Point &a)
{
cout<<"("<<a.x<<", "<<a.y<<")";
return cout;
}
int main(int argc, char **argv)
{
cout<<"*******************"<<endl;
Point p1(1, 2);
Point p2(2, 3);
cout<<"*******************"<<endl;
Point m1 = p1+p2;
Point m2 = p1++;
Point m3 = ++p1;
cout<<"*******************"<<endl;
cout <<"Port = "<<p1<<endl;
return 0;
}
自己看
