iterator_category 2753 modules/core/include/opencv2/core/mat.hpp     typedef std::random_access_iterator_tag iterator_category;
iterator_category 2820 modules/core/include/opencv2/core/mat.hpp     typedef std::random_access_iterator_tag iterator_category;
iterator_category 2873 modules/core/include/opencv2/core/mat.hpp     typedef std::random_access_iterator_tag iterator_category;
iterator_category 3009 modules/core/include/opencv2/core/mat.hpp     typedef std::forward_iterator_tag iterator_category;
iterator_category 3045 modules/core/include/opencv2/core/mat.hpp     typedef std::forward_iterator_tag iterator_category;