class LogicalTime {
  public:
      LogicalTime();
      LogicalTime(Timestamp);
      
      LogicalTime(const LogicalTime&) = default;
      LogicalTime(LogicalTime&&) = default;
  
      LogicalTime& operator=(const LogicalTime&) = default;
      LogicalTime& operator=(LogicalTime&&) = default;

      Timestamp asTimestamp() const;
 
      // increments the clock
      void addTicks(unsigned ticks); 
      std::string toString() const;

  private:
     uint64_t _time{0};
  };