[ns] ns2 recverror

[etudiant etudiant]

Hi,
someone can indicate what meaning of the test "if (!rt->pc_empty())"
thanks

         if (!rt->pc_empty()) {
                 nre->unreachable_dst[nre->DestCount] = rt->rt_dst;
                 nre->unreachable_dst_seqno[nre->DestCount] = rt->rt_seqno;
                 nre->DestCount += 1;
                 rt->pc_delete();
         }