c++ - Macro or inline function to iterate over OpenCV matrices -

does opencv provide macro or function iterate on matrices without knowing channel depth?

eventually implemented myself, wonder whether available somewhere within opencv source, or if there better way achieve same result?

#define cv_eval(src,i,j,c,dst)                                                                                                   \     if(src.depth() == cv_8u) {                                                                                                       \         dst = ((uchar*)(src.data))[ i*src.step1()+ j*src.channels() + c];         }                                                                                                                                                            \   else if(src.depth() == cv_8s) {                                                                                              \         dst = ((schar*)(src.data))[ i*src.step1()+ j*src.channels() + c];         }                                                                                                                                                            \   else if(src.depth() == cv_16u) {                                                                                           \         dst = ((ushort*)(src.data))[ i*src.step1()+ j*src.channels() + c];        }                                                                                                                                                            \   else if(src.depth() == cv_16s) {                                                                                           \         dst = ((short*)(src.data))[ i*src.step1()+ j*src.channels() + c];         }                                                                                                                                                            \   else if(src.depth() == cv_32s) {                                                                                           \         dst = ((int*)(src.data))[ i*src.step1()+ j*src.channels() + c];         }                                                                                                                                                            \   else if(src.depth() == cv_32f) {                                                                                           \         dst = ((float*)(src.data))[ i*src.step1()+ j*src.channels() + c];         }                                                                                                                                                            \   else if(src.depth() == cv_64f) {                                                                                           \         dst = ((double*)(src.data))[ i*src.step1()+ j*src.channels() + c];           \     }                                                                                                                                                            \   else {                                                                                                                                                 \     cv_assert(false);                                                                                                                        \     }