99.重载[] * -> ->*

#include "mainwindow.h"
#include <QApplication>
#include <QPushButton>>

//重载的三种形式,成员函数重载
//友元函数重载,可以使用私有变量以及保护变量
//一般函数重载都是公有变量

class buttons
{
    QPushButton *p;
    int n;

public:
    buttons():n(10)
    {
        p = new QPushButton[10];
        for(int i=0;i<10;i++)
        {
            p[i].resize(100,100);
            p[i].move(i*100,i*100);
            p[i].show();
        }
    }
    ~buttons()
    {
        delete[] p;
    }

    //重载[]
    QPushButton *operator [](int i)
    {
        if(i>=0 && i<=n-1)
        {
            return this->p+i;
        }
    }

    //重载*
    QPushButton *operator *()
    {
         return this->p;
    }

    //重载->
    QPushButton *operator ->()
    {
         return this->p+5;
    }

    //重载->*
    QPushButton *operator ->*(int i)
    {
         return this->p+i;
    }
};


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

    buttons bs;
   // bs[3]->hide();
   // (*bs+2)->hide();
    //bs->hide();
   // bs->*hide();
    (bs->*1)->hide();
    return a.exec();
}