//File queue.h

#ifndef QUEUEH
#define QUEUEH

#include "concglob.h"

typedef int itemtype;

class node {
  friend class queue;
  private:
    itemtype item;
    node* next;
};

class queue {
  public:
    queue();
    ~queue();
    boolean empty() const;
    void insert(itemtype item);
    itemtype remove();
    itemtype front() const;
    void see() const;
    int length();
    void clear();

  private:
    //node* que;
    int size;
    node* head;
    node* tail;
    enum queueError {UNDERFLOW, EMPTY};
    void err(queueError err) const;
};

#endif