The OrderRecord Class

class OrderRecord
{
  public:
  // constructors...
  double CalcRecordPrice() const noexcept;
  bool CheckDate(const Date& start, const Date& end) const noexcept;
  private:
  Date mDate;
  std::string mCouponCode;
  double mUnitPrice{ 0.0 };
  double mDiscount{ 0.0 }; // 0... 1.0
  unsigned int mQuantity{ 0 };
};