NAME

std::valarray::shift - std::valarray::shift

Synopsis

valarray<T> shift( int count ) const;

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

count - number of positions to shift the elements by

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.
* All functions accepting an argument of type const std::valarray&
except begin() and end()
(since C++11) should also accept the replacement type.
* All functions accepting two arguments of type const std::valarray&
should accept every combination of const std::valarray& and the
replacement type.
* The return type does not add more than two levels of template nesting
over the most deeply-nested argument type.

Example

// Run this code

#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";
}

Output:

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