//que9.cpp --- CopyLeft by tsaiwn@csie.nctu.edu.tw
#include<iostream>
#include<queue>
// see  /usr/local/include/g++/queue
// .. and ..  /usr/local/include/g++/stl_queue.h
using namespace std;
template <class T>
class myqueue: public queue<T>{
    public:
       void enqueue(T x){ queue<T>::push(x); }
       void dequeue(void){ queue<T>::pop(); }
       T head(void){ return queue<T>::front(); }
       bool isempty() { return queue<T>::empty(); }
       // size_t size() { return queue<T>::size(); }
};
int main()
{
   myqueue<char> x;
   x.enqueue(53);
   x.enqueue(0x33);
   x.enqueue('7');
   x.enqueue(55);
   x.enqueue(48);
   x.push(56);
   x.push(56);
   x.enqueue(48);
   cout << "Size of the queue = " << x.size() << endl;
   while(! x.isempty())
   {
      cout << x.head() << " ";
      x.dequeue();
   }
   std::cout << endl;
}