const std::shared_ptr<GeomAPI_XYZ> added(const std::shared_ptr<GeomAPI_XYZ>& theArg);
/// result is difference between coordinates of this and the given argument
const std::shared_ptr<GeomAPI_XYZ> added(const std::shared_ptr<GeomAPI_XYZ>& theArg);
/// result is difference between coordinates of this and the given argument