struct casewriter *exclude; /* Writer that gets filtered cases, or NULL. */
};
-static struct casereader_class casereader_filter_class;
+static const struct casereader_class casereader_filter_class;
/* Creates and returns a casereader whose content is a filtered
version of the data in SUBREADER. Only the cases for which
}
/* Filtering casereader class. */
-static struct casereader_class casereader_filter_class =
+static const struct casereader_class casereader_filter_class =
{
casereader_filter_read,
casereader_filter_destroy,
struct variable **vars; /* Variables whose values to filter. */
size_t var_cnt; /* Number of variables. */
enum mv_class class; /* Types of missing values to filter. */
+ casenumber *n_missing;
};
static bool casereader_filter_missing_include (const struct ccase *, void *);
read or, if that never occurs, until the filtering casereader
is destroyed.
+ If N_MISSING is non-null, then after reading, it will be filled
+ with the totla number of dropped cases.
+
After this function is called, READER must not ever again
be referenced directly. It will be destroyed automatically
when the filtering casereader is destroyed. */
casereader_create_filter_missing (struct casereader *reader,
const struct variable **vars, size_t var_cnt,
enum mv_class class,
+ casenumber *n_missing,
struct casewriter *exclude)
{
if (var_cnt > 0 && class != MV_NEVER)
cfm->vars = xmemdup (vars, sizeof *vars * var_cnt);
cfm->var_cnt = var_cnt;
cfm->class = class;
+ cfm->n_missing = n_missing;
+ if (n_missing) *n_missing = 0;
return casereader_create_filter_func (reader,
casereader_filter_missing_include,
casereader_filter_missing_destroy,
struct variable *var = cfm->vars[i];
const union value *value = case_data (c, var);
if (var_is_value_missing (var, value, cfm->class))
- return false;
+ {
+ if ( cfm->n_missing )
+ (*cfm->n_missing)++;
+ return false;
+ }
}
return true;
}