#pragma once
#include <iostream>
#include <iomanip>

using namespace std;

template<class T>
class Queue
{
  struct Node
  {
    T a;
    Node *next;
  };

public:
  Queue();
  void push(T b);
  void pop();
  int getlength();
  virtual void print();

  private:
  Node *head;
  Node *rear;
};

template<class T>
void Queue<T>::push(T b)
{
  Node *p1 = new Node;
  p1->a = b;
  p1->next = NULL;
  rear->next = p1;
  rear = p1;
  head->a++;
  cout << setw(2) << b << setw(2) << "进入队列" << endl;
}

template<class T>
void Queue<T>::pop()
{
  Node *p;
  p = head->next;
  cout << " " << setw(2) << p->a << setw(2) << "出队" << endl;
  head->next = p->next;
  delete p;
  head->a--;
}

template<class T>
int Queue<T>::getlength()
{
  return head->a;
}

template<class T>
void Queue<T>::print()
{
  Node *p;
  p = head->next;
  cout << "队列中的元素" << endl;
  while (p)
  {
    cout << p->a << "->";
    p = p->next;
  }
  cout << "NULL" << endl;
}

template<class T>
Queue<T>::Queue()
{
  rear = head = new Node();
}

 

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