/* class constructor && desctructor */
/* 新建一个对象， 使用老的对象赋值，实际上是调用的拷贝构造函数 */
#include <iostream>
using namespace std;
class Line {
private :
int *ptr;
public:
/* constructor */
Line(int len);
Line(const Line &old);
/* destructor */
~Line(void);
void setLength(int len);
int getLength();
};
Line::Line(int len)
{
ptr = new int;
*ptr = len;
}
Line::~Line()
{
cout << "Destructor!" << endl;
delete ptr;
}
Line::Line(const Line &old)
{
ptr = new int;
*ptr = *old.ptr;
}
void Line::setLength(int len)
{
*ptr = len;
}
int Line::getLength()
{
return *ptr;
}
int main()
{
/* old obj */
Line l(10);
cout << "Line:" << l.getLength() << endl;
/* copy construct1 */
Line l2(l);
cout << "Line2 :" << l2.getLength() << endl;
/* copy construct2 */
/* Line l3 = l2; < == > Line 3(l2); */
Line l3 = l2;
cout << "Line3 :" << l3.getLength() << endl;
return 0;
}
