std::valarray<T>:: shift

Returns a new valarray of the same size with elements whose positions are shifted by count elements. The new position of each element is i−count where i is the previous position. The value of shifted in elements is T ( ) .

Parameters

Return value

The resulting valarray with shifted elements.

Notes

The function can be implemented with the return type different from std::valarray . In this case, the replacement type has the following properties:

• All const member functions of std::valarray are provided.
• std::valarray , std::slice_array , std::gslice_array , std::mask_array and std::indirect_array can be constructed from the replacement type.
• For every function taking a const std:: valarray < T > & except begin() and end() (since C++11) , identical functions taking the replacement types shall be added;
• For every function taking two const std:: valarray < T > & arguments, identical functions taking every combination of const std:: valarray < T > & and replacement types shall be added.
• The return type does not add more than two levels of template nesting over the most deeply-nested argument type.

Example

#include <iostream>
#include <valarray>
 
int main()
{
    std::valarray<int> v{1, 2, 3, 4, 5, 6, 7, 8};
 
    for (auto const& val : v)
        std::cout << val << ' ';
    std::cout << '\n';
 
    std::valarray<int> v2 = v.shift(2);
 
    for (auto const& val : v2)
        std::cout << val << ' ';
    std::cout << '\n';
}

1 2 3 4 5 6 7 8 
3 4 5 6 7 8 0 0

See also