Opencv note (1) Naming rules for data structures (cvmat ,...)

I checked a lot on the Internet and found that it is better to check the source code for information.

Classes starting with CV do not contain specific data (only store pointers)

Cvmat

typedef struct CvMat{    int type;    int step;    /* for internal use only */    int* refcount;    int hdr_refcount;    union    {        uchar* ptr;        short* s;        int* i;        float* fl;        double* db;    } data;<pre name="code" class="cpp">

# Ifdef _ cplusplus Union {int rows; int height ;}; Union {int Cols; int width ;};# else int rows; int Cols; # endif} cvmat;

<pre name="code" class="cpp">CV_INLINE CvMat cvMat( int rows, int cols, int type, void* data CV_DEFAULT(NULL)){    CvMat m;    assert( (unsigned)CV_MAT_DEPTH(type) <= CV_64F );    type = CV_MAT_TYPE(type);    m.type = CV_MAT_MAGIC_VAL | CV_MAT_CONT_FLAG | type;    m.cols = cols;    m.rows = rows;    m.step = m.cols*CV_ELEM_SIZE(type);    m.data.ptr = (uchar*)data;    m.refcount = NULL;    m.hdr_refcount = 0;    return m;}

Cv_inline double cvmget (const cvmat * mat, int row, int col) {// inefficient access! Int type; type = cv_mat_type (mat-> type); Assert (unsigned) Row <(unsigned) mat-> rows & (unsigned) COL <(unsigned) mat-> Cols); If (type = cv_32fc1) Return (float *) (void *) (mat-> data. PTR + (size_t) mat-> step * row) [col]; else {assert (type = cv_64fc1); Return (double *) (void *) (mat-> data. PTR + (size_t) mat-> step * row) [col] ;}} cv_inline void cvmset (cvmat * mat, int row, int Col, double value) {int type; type = cv_mat_type (mat-> type); Assert (unsigned) Row <(unsigned) mat-> rows & (unsigned) COL <(unsigned) mat-> Cols ); if (type = cv_32fc1) (float *) (void *) (mat-> data. PTR + (size_t) mat-> step * row) [col] = (float) value; else {assert (type = cv_64fc1); (double *) (void *) (mat-> data. PTR + (size_t) mat-> step * row) [col] = (double) value ;}}

typedef struct CvMatND{    int type;    int dims;    int* refcount;    int hdr_refcount;    union    {        uchar* ptr;        float* fl;        double* db;        int* i;        short* s;    } data;    struct    {        int size;        int step;    }    dim[CV_MAX_DIM];}CvMatND;

/* Basic element of the file storage - scalar or collection: */typedef struct CvFileNode{    int tag;    struct CvTypeInfo* info; /* type information            (only for user-defined object, for others it is 0) */    union    {        double f; /* scalar floating-point number */        int i;    /* scalar integer number */        CvString str; /* text string */        CvSeq* seq; /* sequence (ordered collection of file nodes) */        CvFileNodeHash* map; /* map (collection of named file nodes) */    } data;}CvFileNode;

Opencv note (1) Naming rules for data structures (cvmat ,...)