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The `signature()` getter can just return a reference to the private vector member variable, and let the caller make a copy if needed. Since the return type is const qualified, this was likely the original intention. Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>