bool mv_is_empty (const struct missing_values *);
int mv_get_width (const struct missing_values *);
/* Inspecting discrete values. */
int mv_n_values (const struct missing_values *);
bool mv_has_value (const struct missing_values *);
bool mv_is_empty (const struct missing_values *);
int mv_get_width (const struct missing_values *);
/* Inspecting discrete values. */
int mv_n_values (const struct missing_values *);
bool mv_has_value (const struct missing_values *);