W3cubDocs

/C++

std::valarray::cshift

valarray<T> cshift( int count ) const;

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

Parameters

count - number of positions to shift the elements by

Return value

The resulting valarray with circularly 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:

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.cshift(2);
 
    for (auto const& val : v2) {
        std::cout << val << " ";
    }
    std::cout << "\n";
}

Output:

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

See also

zero-filling shift the elements of the valarray
(public member function)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/numeric/valarray/cshift