aClass->get_role = getRoleCB;
classInitCB(AtkObjectClass *aClass){    GObjectClass *gobject_class = G_OBJECT_CLASS(aClass);    parent_class = g_type_class_peek_parent(aClass);    aClass->get_name = getNameCB;    aClass->get_description = getDescriptionCB;    aClass->get_parent = getParentCB;    aClass->get_n_children = getChildCountCB;    aClass->ref_child = refChildCB;    aClass->get_index_in_parent = getIndexInParentCB;    aClass->initialize = initializeCB;    gobject_class->finalize = finalizeCB;}