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Signature Description Parameters 
template<typename ... Ts>
void
void self_rotate(std::size_t periods, shift_policy sp);
It rotates all the columns in self up, down, left, or right based on shift_policy.
The index column remains unchanged.
If user rotates with periods that is larger than the column length, the behavior is undefined.
 Ts: The list of types for all columns. A type should be specified only once.
periods: Number of periods to rotate
shift_policy: Specifies the direction (i.e. up/down) to rotate 
template<typename ... Ts>
StdDataFrame<I>
void rotate(std::size_t periods, shift_policy sp);
It is exactly the same as self_rotate, but it leaves self unchanged and returns a new DataFrame with columns rotated. 
static void test_rotating_up_down()  {

    std::cout << "\nTesting Rotating Up/Down ..." << std::endl;

    std::vector<unsigned long>  idx =
        { 123450, 123451, 123452, 123453, 123454, 123455, 123456, 123457, 123458, 123459, 123460, 123461, 123462, 123466 };
    std::vector<double>         d1 = { 15, 16, 15, 18, 19, 16, 21, 0.34, 1.56, 0.34, 2.3, 0.34, 19.0 };
    std::vector<int>            i1 = { 22, 23, 24, 25, 99 };
    std::vector<std::string>    s1 =
        { "qqqq", "wwww", "eeee", "rrrr", "tttt", "yyyy", "uuuu", "iiii", "oooo", "pppp", "2222", "aaaa", "dddd", "ffff" };
    MyDataFrame                 df;

    df.load_data(std::move(idx),
                 std::make_pair("dbl_col", d1),
                 std::make_pair("int_col", i1),
                 std::make_pair("str_col", s1));

    std::cout << "Original DF:" << std::endl;
    df.write<std::ostream, double, int, std::string>(std::cout);

    auto    rudf = df.rotate<double, int, std::string>(3, shift_policy::up);

    std::cout << "Rotated Up DF:" << std::endl;
    rudf.write<std::ostream, double, int, std::string>(std::cout);

    auto    rddf = df.rotate<double, int, std::string>(3, shift_policy::down);

    std::cout << "Rotated Down DF:" << std::endl;
    rddf.write<std::ostream, double, int, std::string>(std::cout);
}

C++ DataFrame