[gtk+] GtkRadioButtonAccessible: add a private struct

[Matthias Clasen <matthiasc src gnome org>]

commit 8b6e9628111efd3af73760bd56c7081f28c573be
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Oct 14 20:18:57 2012 -0400

    GtkRadioButtonAccessible: add a private struct
    
    Move instance fields to a private struct, in preparation
    for installing a11y headers.

 gtk/a11y/gtkradiobuttonaccessible.c |   15 ++++++++++++---
 gtk/a11y/gtkradiobuttonaccessible.h |    7 ++++---
 2 files changed, 16 insertions(+), 6 deletions(-)
---
diff --git a/gtk/a11y/gtkradiobuttonaccessible.c b/gtk/a11y/gtkradiobuttonaccessible.c
index 74b5d85..96cc9c7 100644
--- a/gtk/a11y/gtkradiobuttonaccessible.c
+++ b/gtk/a11y/gtkradiobuttonaccessible.c
@@ -20,6 +20,11 @@
 #include <gtk/gtk.h>
 #include "gtkradiobuttonaccessible.h"
 
+struct _GtkRadioButtonAccessiblePrivate
+{
+  GSList *old_group;
+};
+
 
 G_DEFINE_TYPE (GtkRadioButtonAccessible, _gtk_radio_button_accessible, GTK_TYPE_TOGGLE_BUTTON_ACCESSIBLE)
 
@@ -51,7 +56,7 @@ gtk_radio_button_accessible_ref_relation_set (AtkObject *obj)
   /* If the radio button'group has changed remove the relation */
   list = gtk_radio_button_get_group (GTK_RADIO_BUTTON (widget));
 
-  if (radio_button->old_group != list)
+  if (radio_button->priv->old_group != list)
     {
       AtkRelation *relation;
 
@@ -64,7 +69,7 @@ gtk_radio_button_accessible_ref_relation_set (AtkObject *obj)
     /*
      * Get the members of the button group
      */
-    radio_button->old_group = list;
+    radio_button->priv->old_group = list;
     if (list)
       {
         AtkObject **accessible_array;
@@ -104,10 +109,14 @@ _gtk_radio_button_accessible_class_init (GtkRadioButtonAccessibleClass *klass)
 
   class->initialize = gtk_radio_button_accessible_initialize;
   class->ref_relation_set = gtk_radio_button_accessible_ref_relation_set;
+
+  g_type_class_add_private (klass, sizeof (GtkRadioButtonAccessiblePrivate));
 }
 
 static void
 _gtk_radio_button_accessible_init (GtkRadioButtonAccessible *radio_button)
 {
-  radio_button->old_group = NULL;
+  radio_button->priv = G_TYPE_INSTANCE_GET_PRIVATE (radio_button,
+                                                    GTK_TYPE_RADIO_BUTTON_ACCESSIBLE,
+                                                    GtkRadioButtonAccessiblePrivate);
 }
diff --git a/gtk/a11y/gtkradiobuttonaccessible.h b/gtk/a11y/gtkradiobuttonaccessible.h
index 8d33c3b..a2603f1 100644
--- a/gtk/a11y/gtkradiobuttonaccessible.h
+++ b/gtk/a11y/gtkradiobuttonaccessible.h
@@ -29,14 +29,15 @@ G_BEGIN_DECLS
 #define GTK_IS_RADIO_BUTTON_ACCESSIBLE_CLASS(klass)    (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_RADIO_BUTTON_ACCESSIBLE))
 #define GTK_RADIO_BUTTON_ACCESSIBLE_GET_CLASS(obj)     (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_RADIO_BUTTON_ACCESSIBLE, GtkRadioButtonAccessibleClass))
 
-typedef struct _GtkRadioButtonAccessible      GtkRadioButtonAccessible;
-typedef struct _GtkRadioButtonAccessibleClass GtkRadioButtonAccessibleClass;
+typedef struct _GtkRadioButtonAccessible        GtkRadioButtonAccessible;
+typedef struct _GtkRadioButtonAccessibleClass   GtkRadioButtonAccessibleClass;
+typedef struct _GtkRadioButtonAccessiblePrivate GtkRadioButtonAccessiblePrivate;
 
 struct _GtkRadioButtonAccessible
 {
   GtkToggleButtonAccessible parent;
 
-  GSList *old_group;
+  GtkRadioButtonAccessiblePrivate *priv;
 };
 
 struct _GtkRadioButtonAccessibleClass