4508l2

Listing 2. Creating an Accessory Class and a Static Member Function

class Threaded {
public:
  Threaded() {};
  virtual ~Threaded() {};
  static void *entry (void *ptr);
  virtual void *run ()=0;
};

void *Threaded::entry(void *ptr){
  return reinterpret_cast<Threaded*>(ptr)->run();
}

class CountPrimes : public Threaded {
public:
  CountPrimes(long start_, long stop_);
  long total();
  void *run();
private:      
  long start;
  long stop;
  long count;
  bool counted;
  bool is_prime (long candidate);
};

void *CountPrimes::run(){
  long *return_val=new long(total());
  return reinterpret_cast<void*>(return_val);
}