+#include "libpspp/str.h"
+#include "output/chart.h"
+#include "language/stats/freq.h"
+
+struct piechart
+ {
+ struct chart chart;
+ struct slice *slices;
+ int n_slices;
+ };
+
+struct slice
+ {
+ struct string label;
+ double magnitude;
+ };
+
+struct variable;
+
+struct chart *piechart_create (const struct variable *var,
+ const struct freq *, int n_slices);
+\f
+/* This boilerplate for piechart, a subclass of chart, was
+ autogenerated by mk-class-boilerplate. */
+
+#include <assert.h>
+#include "libpspp/cast.h"
+
+extern const struct chart_class piechart_class;
+
+/* Returns true if SUPER is a piechart, otherwise false. */
+static inline bool
+is_piechart (const struct chart *super)
+{
+ return super->class == &piechart_class;
+}
+
+/* Returns SUPER converted to piechart. SUPER must be a piechart, as
+ reported by is_piechart. */
+static inline struct piechart *
+to_piechart (const struct chart *super)
+{
+ assert (is_piechart (super));
+ return UP_CAST (super, struct piechart, chart);
+}
+
+/* Returns INSTANCE converted to chart. */
+static inline struct chart *
+piechart_super (const struct piechart *instance)
+{
+ return CONST_CAST (struct chart *, &instance->chart);
+}
+
+/* Increments INSTANCE's reference count and returns INSTANCE. */
+static inline struct piechart *
+piechart_ref (const struct piechart *instance)
+{
+ return to_piechart (chart_ref (&instance->chart));
+}