异质链表

/* 异质链表 */

#include<iostream>
#include<QLabel>
#include<QPushButton>
using namespace std;

class base;

class linknode
{
public:
    base *p;
    linknode *pNext;

};

class base
{
public:
    virtual void showit() = 0;

};

class mywindow:public base
{
public:
    MainWindow *p;
    mywindow()
    {
        p = new MainWindow;
    }

    void showit()
    {
        p->show();
    }
};


class mylabel:public base
{
public:
    QLabel *p;
    mylabel()
    {
        p = new QLabel;
    }

    void showit()
    {
        p->show();
    }
};

class mybutton:public base
{
public:
    QPushButton *p;
    mybutton()
    {
        p = new QPushButton;
    }

    void showit()
    {
        p->show();
    }
};



int main(int argc,char *argv[])
{
    QApplication a(argc,argv);

    mywindow my1;
    mylabel my2;
    mybutton my3;
    
    linknode l1;
    linknode l2;
    linknode l3;
    l1.p = &my1;
    l2.p = &my2;
    l3.p = &my3;
    l1.pNext = &l2;
    l2.pNext = &l3;
    l3.pNext = NULL;

    linknode *p = &l1;
    while (p!=NULL)
    {
        p->p->showit();
        p = p->pNext;
    }

    cin.get();
}