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