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
• For every function taking a const std::valarray <T> & except begin() and end() (since C++11)
• For every function taking two const std::valarray <T> & arguments, identical functions taking every combination of const std::valarray <T> &
• 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