code: func LayoutNew(hadjustment, vadjustment *Adjustment) (*Layout, error) {
  	c := C.gtk_layout_new(hadjustment.native(), vadjustment.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	obj := glib.Take(unsafe.Pointer(c))
  	return wrapLayout(obj), nil
  }
docs: // LayoutNew is a wrapper around gtk_layout_new().