std::valarray<T>::cshift

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valarray<T> cshift(int count)const;

Returns a new valarray of the same size with elements whose positions are shifted circularly bycount elements.

A non-negative value ofcount shifts the elements circularly leftcount places and a negative value ofcount 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 fromstd::valarray. In this case, the replacement type has the following properties:

Allconst member functions ofstd::valarray are provided.
std::valarray,std::slice_array,std::gslice_array,std::mask_array andstd::indirect_array can be constructed from the replacement type.
For every function taking aconststd::valarray<T>&exceptbegin() andend()(since C++11), identical functions taking the replacement types shall be added;
For every function taking twoconststd::valarray<T>& arguments, identical functions taking every combination ofconststd::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(autoconst& val: v)std::cout<< val<<' ';std::cout<<'\n'; std::valarray<int> v2= v.cshift(2); for(autoconst& val: v2)std::cout<< val<<' ';std::cout<<'\n';}