【C++】类的静态函数和拷贝构造函数

#include <iostream>
using namespace std;
class Point{
private:
    int x,y;
    static int count;
public:
    Point(int x = 0,int y = 0):x(x),y(y){
        count++;
    }

    Point(Point &p){ //复制构造函数
        x = p.x;
        y = p.y;
        count++;
    }

    ~Point(){ count--; }

    int getX() {return x;}
    int getY() {return y;}

    void showCount(){ //输出静态数据成员
        cout << " Object count = " << count << endl;
    }

    static void showCount1(){ //静态函数成员
        cout << " Object count = " << count << endl;
    }
};

int Point::count = 0; //静态数据成员定义和初始化，使用类名限定
int main(){
    Point a(4,5); //定义对象a，其构造函数会使count增1
    cout << "Point A: " << a.getX() << "," << a.getY() << endl;
    a.showCount();

    Point c = a;
    cout << "Point C: " << c.getX() << "," << c.getY() << endl;
    c.showCount1();

    Point b; //定义对象b，其构造函数会使count增1
    cout << "Point B: " << b.getX() << "," << b.getY() << endl;
    Point::showCount1();

    return 0;
}