counted.h

来自「Thinking in C++ 2nd edition source code 」· C头文件 代码 · 共 33 行

//: C21:Counted.h
// From Thinking in C++, 2nd Edition
// at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// An object that keeps track of itself
#ifndef COUNTED_H
#define COUNTED_H
#include <vector>

class Counted {
  static int count;
  char * id;
public:
  Counted(char * ID) : id(ID) { count++; }
  ~Counted() { 
    std::cout << id << " 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 ///:~