C++ priority_queue swap()

C++ priority_queue swap() function is used to swap the contents of one priority queue with another priority queue of same type and size.

Syntax

Consider priority_queue 'pq' as a priority_queue object.

Parameter

pq1: It is a priority_queue whose contents are to be swapped.

Return value

None

Example 1

#include <iostream>
#include <queue>
using namespace std;
int main()
{
int sum = 0;
priority_queue<int> pqueue,mqueue;
//pushing value in pqueue.
pqueue.push(8);
pqueue.push(6);
pqueue.push(3);
pqueue.push(2);
pqueue.push(1);
  //pushing value in mqueue.
mqueue.push(10);
mqueue.push(60);
mqueue.push(30);
mqueue.push(20);
mqueue.push(10);
  //appllyingswap() method
pqueue.swap(mqueue);
cout<< "elements in pqueue : ";
while (!pqueue.empty())
    {
cout<<pqueue.top() <<' ';
pqueue.pop();
    }
cout<< '\n';
cout<< "elements in mqueue : ";
while (!mqueue.empty())
    {
cout<<mqueue.top() << ' ';
mqueue.pop();
    }
return 0;
}

Output:

elements in pqueue : 60 30 20 10 10 
elements in mqueue : 8 6 3 2 1

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