#include <iostream>
#include "pointer.h"
#include  "base.h"
#include "derived.h"
#include "derived2.h"

pointer::pointer(){
    bp = NULL;
}

pointer::~pointer(){
    delete bp;
}

void pointer::set_up(int type) {
    switch(type) {
       case 0: 
          bp = new base();
          break;
       case 1: 
          bp = new derived();
          break;
       case 2:
          bp = new derived2();
          break;
    }
}

void pointer::a(){
     if (bp != NULL) {
        bp->a();
     }
}

void pointer::b(){
     if (bp != NULL) {
        bp->b();
     }
}

void pointer::c(){
     if (bp != NULL) {
        bp->c();
     }
}