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-rw-r--r--gtk/gtkradiotoolbutton.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/gtk/gtkradiotoolbutton.h b/gtk/gtkradiotoolbutton.h
index 93bc97b1bd..e6068ea526 100644
--- a/gtk/gtkradiotoolbutton.h
+++ b/gtk/gtkradiotoolbutton.h
@@ -43,6 +43,12 @@ struct _GtkRadioToolButton
struct _GtkRadioToolButtonClass
{
GtkToggleToolButtonClass parent_class;
+
+ /* Padding for future expansion */
+ void (* _gtk_reserved1) (void);
+ void (* _gtk_reserved2) (void);
+ void (* _gtk_reserved3) (void);
+ void (* _gtk_reserved4) (void);
};
GType gtk_radio_tool_button_get_type (void) G_GNUC_CONST;