链表只记住最近添加的对象

我有一个任务，要求我将对象添加到链表中。所讨论的对象是形状。

我的问题是我可以向列表中添加对象，但是当我尝试打印它们时，只有最后添加的对象被打印出来，其余的只是垃圾值。

我的代码是这样的:

Source.cpp:

#include "ShapeList.h"
#include <iostream>
using namespace std;
int main()
{
    ShapeList list;
    list.add(Rectangle(0,0,2,5));
    list.print();
}

我不允许改变这个代码。例如，我不允许发送指向新矩形的指针，我应该"深度复制"它。(我希望我用对了那个词。)

我的ShapeList.h是这样的:

#ifndef SHAPELIST_H
#define SHAPELIST_H
#include "Shape.h"
#include "Rectangle.h"
class ShapeList
{
private:
    Shape *conductor; //this will point to each node as it traverses the list
    Shape *root; //the unchanging first node
public:
    ShapeList();
    void print();
    void add(const Shape &s);
};
#endif

和标题看起来像:

#include "ShapeList.h"
#include <iostream>
using namespace std;
ShapeList::ShapeList()
{
    cout << "ShapeList created" << endl;
    root = new Shape; //now root points to a node class
    root->next = 0; //the node root points to has its next  pointer set to equal a null pointer
    conductor = root; //the conductor points to the first node
}
void ShapeList::add(const Shape &s)
{
    cout << "Shapelist's add function called" << endl;
    conductor->next = new Shape; //creates node at the end of the list
    conductor = conductor->next; //goes to next node
    Shape *pShape = s.clone(); //get a pointer to s
    conductor->current = pShape; //points current to pShape point
    conductor->next = 0; //prevents loops from going out of bounds
}
void ShapeList::print()
{
    conductor = root; //the conductor points to the start of the linked list
    if(conductor != 0)
    {
        while(conductor->next != 0)
        {
            conductor = conductor->next;
            cout << conductor->current->width << endl;
        }
        //cout << conductor->current->width << endl;
    }
}

clone函数在所有形状中都是重载的，在本例中是矩形的:

Rectangle * Rectangle::clone() const
{
    cout << "Rectangle's clone function called" << endl;
    Rectangle copiedRect(this);
    Rectangle * pCopiedRect = &copiedRect;
    return pCopiedRect;
}
Rectangle::Rectangle(const Rectangle *ref)
{
    cout << "Rectangle's copy constructor called" << endl;
    this->x = ref->x;
    this->y = ref->y;
    this->width = ref->width;
    this->height = ref->height;
}

我知道要读很多，我很抱歉。不需要的东西我可以去掉。如果你愿意，我也可以添加更多。

我读过Alex Allain关于链表的教程*，以及其他一些文章。如果有人有其他文章，或者类似的东西，我洗耳恭听。

• http://www.cprogramming.com/tutorial/c/lesson15.html