程序中，用基类类型指针，可以生成一个连接不同派生类对象的动态链表，

即每个节点指针可以指向类层次中不同的派生类对象。

这种节点类型不相同的链表称为异质链表。

如：任务管理器，管理不同的进程

 

 

#include "dialog.h"#include 
     
      #include 
      
       #include 
       
        class Base{public:    virtual void show() = 0;    virtual ~Base(){}};class Node{public:    Node *next;    Base *data;};class YiZhiLinkList{public:    YiZhiLinkList()    {        head = nullptr;    }    ~YiZhiLinkList()    {        if(head != nullptr) {            delete head->data;            head = head->next;        }    }    Node* add(Base *base)    {        if (head == nullptr){            head = new Node();            head->data = base;            head->next = nullptr;        }        else {            Node *tmp = head;            Node *n = new Node();            n->data = base;            n->next = nullptr;            while(tmp->next != nullptr) {                tmp = tmp->next;            }            tmp->next = n;        }        return head;    }    void show()    {        while (head != nullptr) {            head->data->show();            head = head->next;        }    }private:    Node *head;};class MyLable:public Base{private:    QLabel label;public:    MyLable(){    }    ~MyLable(){    }    void show()    {        label.setText("This is label");        label.show();    }};class MyButton:public Base{private:    QPushButton button;public:    MyButton(){    }    ~MyButton(){    }    void show()    {        button.setText("This is button");        button.show();    }};class MyDialog:public Base{private:    Dialog w;public:    MyDialog(){    }    ~MyDialog(){    }    void show()    {        w.show();    }};int main(int argc, char *argv[]){    QApplication a(argc, argv);    Base *l = new MyLable();    Base *b = new MyButton();    Base *d = new MyDialog();    YiZhiLinkList Yi;    Yi.add(l);    Yi.add(b);    Yi.add(d);    Yi.show();    return a.exec();}