Swapping of subranges from different containers in C++

Last Updated : 11 Nov, 2018

A container is a holder object that holds a collection of other objects. They are implemented as class templates, which allows a great flexibility in the types supported as elements.

Given some elements in vector and list, swap some of their elements.

// C++ program to swap subranges from different containers 
#include <algorithm> 
#include <iostream> 
#include <list> 
#include <vector> 
using namespace std; 
  
int main() 
{ 
    vector<int> v =  { -10, -15, -30, 20, 500 }; 
    list<int> lt = { 10, 50, 30, 100, 50 }; 
      
    /* swap_ranges() swaps the values starting from the beginning  
       to 3rd last values as per the parameters. 
       Hence (-10, -15, -30) are swapped with (10, 50, 30). */
    swap_ranges(v.begin(), v.begin() + 3, lt.begin()); 
  
    for (int n : v) 
        cout << n << ' '; 
    cout << '\n'; 
  
    for (int n : lt) 
        cout << n << ' '; 
    cout << endl; 
} 

Output:

10 50 30 20 500 
-10 -15 -30 100 50

We can also swap ranges in two vectors.

// C++ program to swap subranges from different containers 
#include <algorithm> 
#include <iostream> 
#include <vector> 
using namespace std; 
  
int main() 
{ 
    vector<int> v1 = { -10, -15, -30, 20, 500 }; 
    vector<int> v2 = { 10, 50, 30, 100, 50 }; 
      
    /* swap_ranges() swaps the values starting from the beginning  
       to 3rd last values as per the parameters. 
       Hence (-10, -15, -30) are swapped with (10, 50, 30). */
    swap_ranges(v1.begin(), v1.begin() + 3, v2.begin()); 
  
    for (int n : v1) 
        cout << n << ' '; 
    cout << '\n'; 
  
    for (int n : v2) 
        cout << n << ' '; 
    cout << endl; 
} 