Class MedicalRecordNumber

06.04-equalComparOfMRN2/main.cpp:6–52

#include <cstdint>

class MedicalRecordNumber {
public:
  MedicalRecordNumber() = default;
  explicit MedicalRecordNumber(uint64_t mrn)
  : mMRN{mrn}
  {}

  // #A The initial member functions
  bool operator==(const MedicalRecordNumber& other) const
  {
    return mMRN == other.mMRN;
  }

  bool operator!=(const MedicalRecordNumber& other) const
  {
    return !(*this == other);
  }

  // #B The additional overloads for uint64_t
  friend bool operator==(const MedicalRecordNumber& rec,
                         const uint64_t&            num)
  {
    return rec.mMRN == num;
  }

  friend bool operator!=(const MedicalRecordNumber& rec,
                         const uint64_t&            num)
  {
    return !(rec == num);
  }

  // #C The additional overloads with swapped arguments for  uint64_t
  friend bool operator==(const uint64_t&            num,
                         const MedicalRecordNumber& rec)
  {
    return (rec == num);
  }

  friend bool operator!=(const uint64_t&            num,
                         const MedicalRecordNumber& rec)
  {
    return !(rec == num);
  }

private:
  uint64_t mMRN;
};

int main()
{