std::valarray<T>::shift (3) - Linux Man Pages

std::valarray<T>::shift: std::valarray<T>::shift

NAME

std::valarray<T>::shift - std::valarray<T>::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‚ąícount 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


       circular shift of the elements of the valarray
cshift (public member function)