C++ Standard Library C++ STL Library

C++ <valarray> - shift() Function



The C++ valarray::shift function returns a new valarray of the same size with elements shifted left n spaces (or right if n is negative), with the new elements value-initialized. The new position of each element is (i − n), where i is the previous position.

Syntax

valarray shift (int n) const;

Parameters

n Specify number of elements to shift. If positive, it is shifted left. If negative, it is shifted right.

Return Value

Returns valarray with shifted elements.

Time Complexity

Depends on library implementation.

Example:

The example below shows the usage of valarray::shift function.

#include <iostream>
#include <valarray>
using namespace std;
 
int main (){
  valarray<int> varr = {10, 20, 30, 40, 50};

  cout<<"varr contains: ";
  for(int i = 0; i < varr.size(); i++)
    cout<<varr[i]<<" "; 

  valarray<int> result1 = varr.shift(2);
  cout<<"\nvarr.shift(2) returns: ";
  for(int i = 0; i < result1.size(); i++)
    cout<<result1[i]<<" "; 

  valarray<int> result2 = varr.shift(-2);
  cout<<"\nvarr.shift(-2) returns: ";
  for(int i = 0; i < result2.size(); i++)
    cout<<result2[i]<<" "; 

  return 0;
}

The output of the above code will be:

varr contains: 10 20 30 40 50 
varr.shift(2) returns: 30 40 50 0 0 
varr.shift(-2) returns: 0 0 10 20 30 

❮ C++ <valarray> Library

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