: where(where), crc(crc32_z(0, nullptr, 0)) {}

      : where(where), crc(crc32(0, nullptr, 0)) {}

    crc =
        crc32_z(crc, static_cast<const Bytef *>(static_cast<const void *>(&x)),

    crc = crc32(crc, static_cast<const Bytef *>(static_cast<const void *>(&x)),