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91 lines
1.3 KiB
91 lines
1.3 KiB
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/*************************************************
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* queue.cpp *
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* *
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* Copyright (C) 1995-1999 Microsoft Inc. *
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* *
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*************************************************/
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#include "stdafx.h"
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#include "queue.h"
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CQueue::CQueue(int nSize)
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{
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m_pQueue = new int[nSize+1];
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m_nSize = nSize+1;
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m_nFront = 0;
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m_nRear = 0;
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}
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CQueue::~CQueue()
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{
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delete[] m_pQueue;
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}
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int CQueue::Peek()
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{
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if (m_nFront == m_nRear)
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return -1;
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else
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return m_pQueue[m_nRear];
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}
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int CQueue::Get()
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{
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if (m_nFront == m_nRear)
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return -1;
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else
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{
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int nTmp = m_pQueue[m_nRear];
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m_nRear = Inc(m_nRear);
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return nTmp;
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}
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}
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BOOL CQueue::Add(int data)
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{
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if (Inc(m_nFront) == m_nRear)
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return FALSE;
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else
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{
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m_pQueue[m_nFront] = data;
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m_nFront = Inc(m_nFront);
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return TRUE;
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}
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}
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int CQueue::Inc(int x)
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{
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if ((x+1) < m_nSize)
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x++;
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else
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x = 0;
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return x;
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}
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int CQueue::Dec(int x)
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{
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if ((x-1) >= 0)
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x--;
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else
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x = m_nSize - 1;
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return x;
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}
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BOOL CQueue::IsEmpty()
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{
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return m_nRear == m_nFront;
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}
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void CQueue::Dump()
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{
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int pf = m_nFront;
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int pr = m_nRear;
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if (pf == pr) return;
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for (; pf != pr; )
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{
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TRACE("[%d]%d,",pr,m_pQueue[pr]);
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pr = Inc(pr);
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}
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}
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