The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <iostream>
#include <queue>
#include <string>
using namespace std;
int main()
{
queue<string> q;
// insert three elements into the queue
q.push("These ");
q.push("are ");
q.push("more than ");
// read and print two elements from the queue
cout << q.front();
q.pop();
cout << q.front();
q.pop();
// insert two new elements
q.push("four ");
q.push("words!");
// skip one element
q.pop();
// read and print two elements
cout << q.front();
q.pop();
cout << q.front() << endl;
q.pop();
// print number of elements in the queue
cout << "number of elements in the queue: " << q.size()
<< endl;
}