Class Counter

src/include/counter.h:22–55

template <typename T>
class Counter {
public:
  Counter() {
    _count()++;
    _increments()++;
  }
  Counter(const Counter &rhs) {
    _count()++;
    _increments()++;
  }
  Counter(Counter &&rhs) {}
  ~Counter() {
    _count()--;
  }
  static uint64_t count() {
    return _count();
  }
  static uint64_t increments() {
    return _increments();
  }
  static uint64_t decrements() {
    return increments()-count();
  }

private:
  static std::atomic<uint64_t> &_count() {
    static std::atomic<uint64_t> c;
    return c;
  }
  static std::atomic<uint64_t> &_increments() {
    static std::atomic<uint64_t> i;
    return i;
  }
};

#endif