enum mtf_type type;
int sequence;
- struct variable **by; /* List of BY variables for this file. */
+ const struct variable **by; /* List of BY variables for this file. */
struct mtf_variable *vars; /* Variables to copy to output. */
size_t var_cnt; /* Number of other variables. */
struct ccase buffered_case; /* Case ready for output except that we don't
know the value for the LAST variable yet. */
struct ccase prev_BY_case; /* Case with values of last set of BY vars. */
- struct variable **prev_BY; /* Last set of BY variables. */
+ const struct variable **prev_BY; /* Last set of BY variables. */
};
static void mtf_free (struct mtf_proc *);