table of contents
std::valarray::shift(3) | C++ Standard Libary | std::valarray::shift(3) |
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
See also¶
cshift circular shift of the elements of the valarray
(public member function)
2022.07.31 | http://cppreference.com |