/**
   * @fn DFRobot_VL53L0X
   * @brief DFRobot_VL53L0X abstract class constructor.
   */
  DFRobot_VL53L0X();
  ~DFRobot_VL53L0X();
  /**
   * @fn begin
   * @brief Init sensor and set I2C sub-device address.
   * @param addr 7 bits I2C address: 1~127
   * @return NONE
   */
  void begin(uint8_t addr = VL53L0X_DEF_I2C_ADDR);	
  /**
   * @fn setMode
   * @brief Set operational mode to VL53L0X sensor.
   * @param mode Work mode settings
   * @n     eSingle      Single mode
   * @n     eContinuous  Back-to-back mode
   * @param precision Set measurement precision
   * @n     eHigh  High precision(0.25mm)
   * @n     eLow   Low precision(1mm)
   * @return NONE
   */
  void setMode(eModeState mode, ePrecisionState precision);
  /**
   * @fn start
   * @brief Start measuring distance.
   */
  void start();
  /**
   * @fn stop
   * @brief Stop measurement.
   */
  void stop();
  /**
   * @fn getDistance
   * @brief This function returns the distance measured by the sensor in mm.
   * @return The detailed distance
   */
  float getDistance();
  /**
   * @fn getAmbientCount
   * @brief Get ambient count.
   * @return Ambient count.
   */
  uint16_t getAmbientCount();
  /**
   * @fn getSignalCount
   * @brief Get signal count.
   * @return Signal count.
   */
  uint16_t getSignalCount();
  /**
   * @fn getStatus
   * @brief Get Status flag.
   * @return Status flag.
   */
  uint8_t getStatus();