Method copy

src/msg/async/dpdk/Packet.h:117–128

    }

    static std::unique_ptr<impl> copy(impl* old, size_t nr) {
      auto n = allocate(nr);
      n->_deleter = std::move(old->_deleter);
      n->_len = old->_len;
      n->_nr_frags = old->_nr_frags;
      n->headroom = old->headroom;
      n->_offload_info = old->_offload_info;
      n->rss_hash = old->rss_hash;
      std::copy(old->frags, old->frags + old->_nr_frags, n->frags);
      old->copy_internal_fragment_to(n.get());
      return n;
    }

    static std::unique_ptr<impl> copy(impl* old) {
      return copy(old, old->_nr_frags);