func (v *TreeIter) Copy() (*TreeIter, error) {
	c := C.gtk_tree_iter_copy(v.native())
	if c == nil {
		return nil, nilPtrErr
	}
	t := &TreeIter{*c}
	runtime.SetFinalizer(t, (*TreeIter).free)
	return t, nil
}
func (v *TreeIter) Copy() (*TreeIter, error) {
	c := C.gtk_tree_iter_copy(v.native())
	if c == nil {
		return nil, nilPtrErr
	}
	t := &TreeIter{*c}
	runtime.SetFinalizer(t, (*TreeIter).free)
	return t, nil
}
// Copy() is a wrapper around gtk_tree_iter_copy().