C++ Vector swap() function

C++ Vector swap() function tutorial for beginners and professionals with examples on assign(), at(), back(), begin(), capacity(), cbegin(), cend(), clear(), crbegin(), crend(), data(), emplace(), end(), front(), rbegin(), resize(), size(), swap() etc.

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C++ Vector swap()

This function is used to exchange the elements specified in two vectors.

Syntax

Consider two vectors v1 and v2. Syntax would be:

v1.swap(v2);

Parameter

v2: v2 is a vector, whose value is to be swapped with another vector.

Return value

It does not return any value.

Example 1

Let's see a simple example.

#include<iostream>
#include<vector>
using namespace std;
int main()
{
vector<int>  v1={1,2,3,4,5};
vector<int>  v2={6,7,8,9,10};
cout<<"Before swapping,elements of v1 are :";
for (int i=0;i<v1.size();i++)
cout<<v1[i]<<" ";
cout<<'\n';
cout<<"Before swapping,elements of v2 are :";
for(int i=0;i<v2.size();i++)
cout<<v2[i]<<" ";
cout<<'\n';
v1.swap(v2);
cout<<"After swapping,elements of v1 are  :";
for(int i=0;i<v1.size();i++)
cout<<v1[i]<<" ";
cout<<'\n';
cout<<"After swapping,elements of v2 are:";
for(int i=0;i<v2.size();i++)
cout<<v2[i]<<" ";
return 0;
}

Output:

Before swapping,elements of v1 are :1 2 3 4 5 
Before swapping,elements of v2 are :6 7 8 9 10 
After swapping,elements of v1 are  :6 7 8 9 10 
After swapping,elements of v2 are :1 2 3 4 5

In this example, swap() function exchanges the elements of vector v1 with the vector v2.

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