counted.h

来自「Thinking in C++(Second Editon)」· C头文件 代码 · 共 31 行

//: C06:Counted.h
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// 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;
  }
};

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 ///:~