Примеры ошибок, обнаруженных с помощью диагностики V758

V758. Reference was invalidated because of destruction of the temporary object returned by the function.

OpenCV

V758 The 'graph' reference becomes invalid when smart pointer returned by a function is destroyed. utils.cpp 391

template<typename T>
struct Ptr : public std::shared_ptr<T>;
// ....
Ptr<FlannNeighborhoodGraph> FlannNeighborhoodGraph::create(....)
{
    return makePtr<FlannNeighborhoodGraphImpl>(....);
}

void Utils::densitySort (const Mat &points, int knn,
                         Mat &sorted_points, std::vector<int> &sorted_mask)
{
  // ....
  // get neighbors
  FlannNeighborhoodGraph &graph =                                  // <=
    *FlannNeighborhoodGraph::create(....);

  std::vector<double> sum_knn_distances (points_size, 0);
  for (int p = 0; p < points_size; p++) {
    const std::vector<double> &dists = graph.getNeighborsDistances(p);
    for (int k = 0; k < knn; k++)
      sum_knn_distances[p] += dists[k];
  }
  // ....
}