gtk/print.go
func (ps *PaperSize) Copy() (*PaperSize, error) {
	c := C.gtk_paper_size_copy(ps.native())
	if c == nil {
		return nil, nilPtrErr
	}
	t := &PaperSize{c}
	runtime.SetFinalizer(t, (*PaperSize).free)
	return t, nil
}
func (ps *PaperSize) Copy() (*PaperSize, error) {
	c := C.gtk_paper_size_copy(ps.native())
	if c == nil {
		return nil, nilPtrErr
	}
	t := &PaperSize{c}
	runtime.SetFinalizer(t, (*PaperSize).free)
	return t, nil
}
// Copy() is a wrapper around gtk_paper_size_copy().