(3.4) backport: Fixed warnings produced by clang-9.0.0

modules/cvv/src/impl/call.hpp

@@ -101,9 +101,6 @@ class Call
 	Call(const Call &) = default;
 	Call(Call &&) = default;
 
-	Call &operator=(const Call &) = default;
-	Call &operator=(Call &&) = default;
-
 	impl::CallMetaData metaData_;
 	size_t id;
 	QString calltype;

modules/face/src/facemarkLBF.cpp

@@ -666,7 +666,7 @@ Mat FacemarkLBFImpl::BBox::project(const Mat &shape) const {
         res(i, 0) = (shape_(i, 0) - x_center) / x_scale;
         res(i, 1) = (shape_(i, 1) - y_center) / y_scale;
     }
-    return res;
+    return CV_CXX_MOVE(res);
 }
 
 // Project relative shape to absolute shape binding to this bbox
@@ -677,7 +677,7 @@ Mat FacemarkLBFImpl::BBox::reproject(const Mat &shape) const {
         res(i, 0) = shape_(i, 0)*x_scale + x_center;
         res(i, 1) = shape_(i, 1)*y_scale + y_center;
     }
-    return res;
+    return CV_CXX_MOVE(res);
 }
 
 Mat FacemarkLBFImpl::getMeanShape(std::vector<Mat> &gt_shapes, std::vector<BBox> &bboxes) {
@@ -1038,7 +1038,7 @@ Mat FacemarkLBFImpl::RandomForest::generateLBF(Mat &img, Mat &current_shape, BBo
             lbf_feat(i*trees_n + j) = (i*trees_n + j)*base + code;
         }
     }
-    return lbf_feat;
+    return CV_CXX_MOVE(lbf_feat);
 }
 
 void FacemarkLBFImpl::RandomForest::write(FileStorage fs, int k) {
@@ -1380,7 +1380,7 @@ Mat FacemarkLBFImpl::Regressor::globalRegressionPredict(const Mat &lbf, int stag
         for (int j = 0; j < lbf.cols; j++) y += w_ptr[lbf_ptr[j]];
         delta_shape(i, 1) = y;
     }
-    return delta_shape;
+    return CV_CXX_MOVE(delta_shape);
 } // Regressor::globalRegressionPredict
 
 Mat FacemarkLBFImpl::Regressor::predict(Mat &img, BBox &bbox) {

modules/face/src/mace.cpp

@@ -106,7 +106,7 @@ struct MACEImpl CV_FINAL : MACE {
         complexInput.copyTo(dftImg(Rect(0,0,IMGSIZE,IMGSIZE)));
 
         dft(dftImg, dftImg);
-        return dftImg;
+        return CV_CXX_MOVE(dftImg);
     }
 
 

modules/optflow/src/optical_flow_io.cpp

@@ -55,12 +55,12 @@ CV_EXPORTS_W Mat readOpticalFlow( const String& path )
     Mat_<Point2f> flow;
     std::ifstream file(path.c_str(), std::ios_base::binary);
     if ( !file.good() )
-        return flow; // no file - return empty matrix
+        return CV_CXX_MOVE(flow); // no file - return empty matrix
 
     float tag;
     file.read((char*) &tag, sizeof(float));
     if ( tag != FLOW_TAG_FLOAT )
-        return flow;
+        return CV_CXX_MOVE(flow);
 
     int width, height;
 
@@ -79,14 +79,14 @@ CV_EXPORTS_W Mat readOpticalFlow( const String& path )
             if ( !file.good() )
             {
                 flow.release();
-                return flow;
+                return CV_CXX_MOVE(flow);
             }
 
             flow(i, j) = u;
         }
     }
     file.close();
-    return flow;
+    return CV_CXX_MOVE(flow);
 }
 CV_EXPORTS_W bool writeOpticalFlow( const String& path, InputArray flow )
 {

modules/ovis/src/ovis.cpp

@@ -604,7 +604,7 @@ class WindowSceneImpl : public WindowScene
         node.setScale(value[0], value[1], value[2]);
     }
 
-    void getEntityProperty(const String& name, int prop, OutputArray value)
+    void getEntityProperty(const String& name, int prop, OutputArray value) CV_OVERRIDE
     {
         SceneNode& node = _getSceneNode(sceneMgr, name);
         switch(prop)

modules/sfm/src/numeric.cpp

@@ -140,7 +140,7 @@ skewMat( const Mat_<T> &x )
           x(2),    0 , -x(0),
          -x(1),  x(0),    0;
 
-  return skew;
+  return CV_CXX_MOVE(skew);
 }
 
 Mat

modules/ximgproc/test/test_sparse_match_interpolator.cpp

@@ -20,12 +20,12 @@ Mat readOpticalFlow( const String& path )
     Mat_<Point2f> flow;
     std::ifstream file(path.c_str(), std::ios_base::binary);
     if ( !file.good() )
-        return flow; // no file - return empty matrix
+        return CV_CXX_MOVE(flow); // no file - return empty matrix
 
     float tag;
     file.read((char*) &tag, sizeof(float));
     if ( tag != FLOW_TAG_FLOAT )
-        return flow;
+        return CV_CXX_MOVE(flow);
 
     int width, height;
 
@@ -44,14 +44,14 @@ Mat readOpticalFlow( const String& path )
             if ( !file.good() )
             {
                 flow.release();
-                return flow;
+                return CV_CXX_MOVE(flow);
             }
 
             flow(i, j) = u;
         }
     }
     file.close();
-    return flow;
+    return CV_CXX_MOVE(flow);
 }
 
 CV_ENUM(GuideTypes, CV_8UC1, CV_8UC3)