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queue.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-13-0/common/queue.h $
 * $Id: queue.h 35651 2009-01-01 17:05:05Z fingolfin $
 */

#ifndef COMMON_QUEUE_H
#define COMMON_QUEUE_H

#include "common/scummsys.h"
#include "common/list.h"

namespace Common {

/**
 * Variable size Queue class, implemented using our List class.
 */
template<class T>
00037 class Queue {
public:
      typedef T value_type;

public:
      Queue<T>() : _impl() {}
      Queue<T>(const Queue<T> &queue) : _impl(queue._impl) {}

      Queue<T> &operator=(const Queue<T> &queue) {
            _impl = queue._impl;
            return *this;
      }

      bool empty() const {
            return _impl.empty();
      }

      void clear() {
            _impl.clear();
      }

      void push(const T &x) {
            _impl.push_back(x);
      }

      T &front() {
            return *_impl.begin();
      }

      const T &front() const {
            return *_impl.begin();
      }

      T &back() {
            return *_impl.reverse_begin();
      }

      const T &back() const {
            return *_impl.reverse_begin();
      }

      T pop() {
            T tmp = front();
            _impl.pop_front();
            return tmp;
      }

      int size() const {
            return _impl.size();
      }

private:
      List<T>     _impl;
};

} // End of namespace Common

#endif

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