# Pastebin dpsNQFd8
```
  POD_CLASS ec_point {
    char data[32];
  };

  POD_CLASS ec_scalar {
    char data[32];
  };

  POD_CLASS public_key: ec_point {
    friend class crypto_ops;
  };

  using secret_key = epee::mlocked<tools::scrubbed<ec_scalar>>;
  using public_key_memsafe = epee::mlocked<tools::scrubbed<public_key>>;

  // works
  std::unordered_map<secret_key, int> works;
  // doesn't work
  std::unordered_map<public_key_memsafe, int> fails;
```