-GtkBitmask * _gtk_bitmask_new (void);
-GtkBitmask * _gtk_bitmask_copy (const GtkBitmask *mask);
-void _gtk_bitmask_free (GtkBitmask *mask);
+static inline GtkBitmask * _gtk_bitmask_intersect (GtkBitmask *mask,
+ const GtkBitmask *other) G_GNUC_WARN_UNUSED_RESULT;
+static inline GtkBitmask * _gtk_bitmask_union (GtkBitmask *mask,
+ const GtkBitmask *other) G_GNUC_WARN_UNUSED_RESULT;
+static inline GtkBitmask * _gtk_bitmask_subtract (GtkBitmask *mask,
+ const GtkBitmask *other) G_GNUC_WARN_UNUSED_RESULT;