C++ priority_queue pop()

pq.pop ();

#include <iostream>
#include <queue>
using namespace std;
int main()
{
  priority_queue<int> mp;
mp.push(10);
mp.push(25);
mp.push(30);
mp.push(35);
mp.push(40);
cout<< "poping element ";
while(!mp.empty())
{
cout<< ' ' <<mp.top();
mp.pop();
}
return 0;
}

poping element  40 35 30 25 10