text: // % copyleft %
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  //    of conditions and the following disclaimer in the documentation and/or other
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  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
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  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #pragma once
  
  #include "serialization/keyvalue_serialization.h"
  #include <boost/serialization/serialization.hpp>
  #include <boost/serialization/version.hpp>
  #include <ostream>
  
  namespace cryptonote
  {
    struct subaddress_index
    {
      uint32_t major;
      uint32_t minor;
      bool operator==(const subaddress_index& rhs) const { return !memcmp(this, &rhs, sizeof(subaddress_index)); }
      bool operator!=(const subaddress_index& rhs) const { return !(*this == rhs); }
      bool is_zero() const { return major == 0 && minor == 0; }
  
      BEGIN_SERIALIZE_OBJECT()
        FIELD(major)
        FIELD(minor)
      END_SERIALIZE()
  
      BEGIN_KV_SERIALIZE_MAP()
        KV_SERIALIZE(major)
        KV_SERIALIZE(minor)
      END_KV_SERIALIZE_MAP()
    };
  }
  
  namespace cryptonote {
    inline std::ostream& operator<<(std::ostream& out, const cryptonote::subaddress_index& subaddr_index)
    {
      return out << subaddr_index.major << '/' << subaddr_index.minor;
    }
  }
  
  namespace std
  {
    template <>
    struct hash<cryptonote::subaddress_index>
    {
      size_t operator()(const cryptonote::subaddress_index& index ) const
      {
        size_t res;
        if (sizeof(size_t) == 8)
        {
          res = ((uint64_t)index.major << 32) | index.minor;
        }
        else
        {
          // https://stackoverflow.com/a/17017281
          res = 17;
          res = res * 31 + hash<uint32_t>()(index.major);
          res = res * 31 + hash<uint32_t>()(index.minor);
        }
        return res;
      }
    };
  }
  
  BOOST_CLASS_VERSION(cryptonote::subaddress_index, 0)
  
  namespace boost
  {
    namespace serialization
    {
      template <class Archive>
      inline void serialize(Archive &a, cryptonote::subaddress_index &x, const boost::serialization::version_type ver)
      {
        a & x.major;
        a & x.minor;
      }
    }
  }
  