std::valarray<T>::shift
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std::valarray
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().
Contents
[edit] Parameters
count
-
number of positions to shift the elements by
[edit] Return value
The resulting valarray with shifted elements.
[edit] 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.
- 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 of const 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.
[edit] 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
[edit] See also
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