C++ vector swap() usage and example

C++ Vector (Container)

This function is used to swap the specified elements in two vectors (vector).

Syntax

two vectors (vector) v1and v2. Syntax is:

v1.swap(v2);

Parameter

v2: v2is a vector (vector) whose values will be swapped with another vector (vector).

Return value

It does not return any value.

Example1

Let's look at a simple example.

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, v"1The element is : ";"
for (int i = 0; i < v1.size();i++)
cout << v1[i] << "  ";
cout << '\n';
cout << "Before swapping, v"2The element is : ";"
for(int i = 0; i < v2.size();i++)
cout << v2[i] << "  ";
cout << '\n';
v1.swap(v2);
cout << "After swapping, v1The elements are:"
for(int i = 0; i < v1.size();i++)
cout << v1[i] << "  ";
cout << '\n';
cout << "After swapping, v2The elements are:"
for(int i = 0; i < v2.size();i++)
cout << v2[i] << "  ";
return 0;
}

Output:

Before swapping, v1The elements are:1　2　3　4　5　
Before swapping, v2The elements are:6　7　8　9　10　
After swapping, v1The elements are:6　7　8　9　10　
After swapping, v2The elements are:1　2　3　4　5

In this example, the swap() function will swap the elements of vector (vector) v1The elements with vector (vector) v2Swap.

C++ Vector (Container)