counted.h

这是介绍C++非常经典的一本书,无论是初学者还是对C++有一定了解的人都值得看的一本书.

//: C05:Counted.h
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// An object that keeps track of itself
#ifndef COUNTED_H
#define COUNTED_H
#include <vector>
#include <iostream>

class Counted {
  static int count;
  char* ident;
public:
  Counted(char* id) : ident(id) { count++; }
  ~Counted() { 
    std::cout << ident << " count = " 
      << --count << std::endl;
  }
};

int Counted::count = 0;

class CountedVector : 
  public std::vector<Counted*> {
public:
  CountedVector(char* id) {
    for(int i = 0; i < 5; i++)
      push_back(new Counted(id));
  }
};
#endif // COUNTED_H ///:~