Function OcTreeVolumeSortPredicate

octomap/src/testing/test_iterators.cpp:112–119

for unique comparing, need to sort the lists:

// for unique comparing, need to sort the lists:
bool OcTreeVolumeSortPredicate(const OcTreeVolume& lhs, const OcTreeVolume& rhs)
{
  return ( lhs.second < rhs.second
      ||  (lhs.second == rhs.second &&
          lhs.first.x() < rhs.first.x()
          &&  lhs.first.y() < rhs.first.y()
          &&  lhs.first.z() < rhs.first.z()));
}


double timediff(const timeval& start, const timeval& stop){