复制构造函数实例

#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<cstdlib>
#include<ctime>
#include<fstream>
#include<climits>
using namespace std;

class Point
{
public:
	Point(double x, double y){};
	Point(Point &p);
private:
	double x, y;
};

Point::Point(Point &p):x(p.x), y(p.y)
{
	cout<<"calling copy gouzao of point"<<endl;
}

class Line
{
public:
	Line(Point p1, Point p2);
	Line(Line &l);
private:
	Point p1, p2;
};
//Point有形参，所以只能用初始化列表初始化
//需要用初始化列表初始化：1.内嵌对象有参数表 2.常成员，需要绑定一个对象
Line::Line(Point mp1, Point mp2):p1(mp1), p2(mp2)
{
	cout<<"calling gouzao of line"<<endl;
}

Line::Line(Line &l):p1(l.p1), p2(l.p2)
{
	cout<<"calling copy gouzao of line"<<endl;
}

int main()
{
	Point myp1(3, 5), myp2(3, 6);
	Line myl(myp1, myp2);
	Line myl2(myl);
	return 0;
}