static void dialog_button_callback( ui::Widget widget, gpointer data ){
int *loop, *ret;
auto parent = widget.window();
loop = (int*)g_object_get_data( G_OBJECT( parent ), "loop" );
ret = (int*)g_object_get_data( G_OBJECT( parent ), "ret" );
*loop = 0;
*ret = gpointer_to_int( data );
}
/**
* @brief function for close button to destroy the toplevel widget
*/
static void close_window( ui::Widget widget, gpointer data ){
widget.window().destroy();
}