std::valarray::cshift - cppreference.com (original) (raw)
| valarray<T> cshift( int count ) const; | | | | --------------------------------------- | | |
Returns a new valarray of the same size with elements whose positions are shifted circularly by count elements.
A non-negative value of count shifts the elements circularly left count places and a negative value of count shifts the elements circularly right -count places.
[edit] Parameters
| count | - | number of positions to shift the elements by |
|---|
[edit] Return value
The resulting valarray with circularly 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
Output:
1 2 3 4 5 6 7 8 3 4 5 6 7 8 1 2
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 618 | C++98 | the expression of the shifted elementscontains zero-division if size() is 0 | describes the new positionswithout using expressions |
[edit] See also
| | zero-filling shift the elements of the valarray (public member function) [edit] | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |