MCQueue.h

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#ifndef MCQUEUE_H
#define MCQUEUE_H

#include "MercuryVector.h"

template<typename T>
class MCQueue
{
public:
    MCQueue(unsigned long size)
        :m_tail(0), m_head(0)
    {
        m_queue.resize(size);
    };

    bool push_back(const T& x)
    {
        if (!isFull())
        {
            //write then move
            m_queue[m_tail].data = x;
            m_queue[m_tail].valid = true;
            m_tail = nextItem(m_tail);
            return true;
        }
        return false;
    }

    T& front()
    {
        return m_queue[m_head].data;
    }

    bool pop_front()
    {
        if (!isEmpty())
        {
            m_queue[nextItem(m_head)].valid = false;
            m_head = nextItem(m_head);
        }
        return false;
    }

    inline bool isFull() { return (m_tail == m_head)&&m_queue[nextItem(m_head)].valid; }
    inline bool isEmpty() { return (m_tail == m_head)&&(!m_queue[nextItem(m_head)].valid); }
private:
    struct status
    {
        status()
            :valid(false)
        {}
        T data;
        bool valid;
    };
    inline unsigned long nextItem(unsigned long i) { return ++i%m_queue.size(); }
    unsigned long m_tail;
    unsigned long m_head;
    MVector< status > m_queue;
};

#endif

/* 
 * Copyright (c) 2007 Joshua Allen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *  -   Redistributions of source code must retain the above
 *      copyright notice, this list of conditions and the following disclaimer.
 *  -   Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in
 *      the documentation and/or other materials provided with the distribution.
 *  -   Neither the name of the Mercury Engine nor the names of its
 *      contributors may be used to endorse or promote products derived from
 *      this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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