std::valarray<T>::shift
From cppreference.com
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
constmember 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 ofconst 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.
- All
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
See also
| circular shift of the elements of the valarray (public member function) |