Several type of formal refactoring:

1. someMatrix.data -> someMatrix.prt()
2. someMatrix.data + someMatrix.step * lineIndex -> someMatrix.ptr( lineIndex )
3. (SomeType*) someMatrix.data -> someMatrix.ptr<SomeType>()
4. someMatrix.data -> !someMatrix.empty() ( or !someMatrix.data -> someMatrix.empty() ) in logical expressions

samples/cpp/tutorial_code/Histograms_Matching/EqualizeHist_Demo.cpp

@@ -26,7 +26,7 @@ int main( int, char** argv )
   /// Load image
   src = imread( argv[1], 1 );
 
-  if( !src.data )
+  if( src.empty() )
     { cout<<"Usage: ./Histogram_Demo <path_to_image>"<<endl;
       return -1;
     }

samples/cpp/tutorial_code/Histograms_Matching/calcHist_Demo.cpp

@@ -23,7 +23,7 @@ int main( int, char** argv )
   /// Load image
   src = imread( argv[1], 1 );
 
-  if( !src.data )
+  if( src.empty() )
     { return -1; }
 
   /// Separate the image in 3 places ( B, G and R )