Parameters should have been passed by reference

modules/calib3d/src/circlesgrid.cpp

@@ -66,7 +66,7 @@ void drawPoints(const std::vector<Point2f> &points, Mat &outImage, int radius =
 }
 #endif
 
-void CirclesGridClusterFinder::hierarchicalClustering(const std::vector<Point2f> points, const Size &patternSz, std::vector<Point2f> &patternPoints)
+void CirclesGridClusterFinder::hierarchicalClustering(const std::vector<Point2f> &points, const Size &patternSz, std::vector<Point2f> &patternPoints)
 {
 #ifdef HAVE_TEGRA_OPTIMIZATION
     if(tegra::hierarchicalClustering(points, patternSz, patternPoints))
@@ -135,7 +135,7 @@ void CirclesGridClusterFinder::hierarchicalClustering(const std::vector<Point2f>
     }
 }
 
-void CirclesGridClusterFinder::findGrid(const std::vector<cv::Point2f> points, cv::Size _patternSize, std::vector<Point2f>& centers)
+void CirclesGridClusterFinder::findGrid(const std::vector<cv::Point2f> &points, cv::Size _patternSize, std::vector<Point2f>& centers)
 {
   patternSize = _patternSize;
   centers.clear();

modules/calib3d/src/circlesgrid.hpp

@@ -62,10 +62,10 @@ public:
     squareSize = 1.0f;
     maxRectifiedDistance = (float)(squareSize / 2.0);
   }
-  void findGrid(const std::vector<cv::Point2f> points, cv::Size patternSize, std::vector<cv::Point2f>& centers);
+  void findGrid(const std::vector<cv::Point2f> &points, cv::Size patternSize, std::vector<cv::Point2f>& centers);
 
   //cluster 2d points by geometric coordinates
-  void hierarchicalClustering(const std::vector<cv::Point2f> points, const cv::Size &patternSize, std::vector<cv::Point2f> &patternPoints);
+  void hierarchicalClustering(const std::vector<cv::Point2f> &points, const cv::Size &patternSize, std::vector<cv::Point2f> &patternPoints);
 private:
   void findCorners(const std::vector<cv::Point2f> &hull2f, std::vector<cv::Point2f> &corners);
   void findOutsideCorners(const std::vector<cv::Point2f> &corners, std::vector<cv::Point2f> &outsideCorners);