code: func PaperSizeNew(name string) (*PaperSize, error) {
  	cstr := C.CString(name)
  	defer C.free(unsafe.Pointer(cstr))
  	var gName *C.gchar
  
  	if name == "" {
  		gName = nil
  	} else {
  		gName = (*C.gchar)(cstr)
  	}
  
  	c := C.gtk_paper_size_new(gName)
  	if c == nil {
  		return nil, nilPtrErr
  	}
  
  	t := &PaperSize{c}
  	runtime.SetFinalizer(t, (*PaperSize).free)
  	return t, nil
  }
docs: // PaperSizeNew() is a wrapper around gtk_paper_size_new().