watchlst.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
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 * This file, and the files included with this file, is distributed and made 
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 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
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 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
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 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
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 * ***** END LICENSE BLOCK ***** */ 

#include "watchlst.h"

#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE		
static const char HX_THIS_FILE[] = __FILE__;
#endif

WListElem::WListElem()
{
    prev = next = this;
}

WatchList::WatchList()
{
    head = new WListElem;
    head->data = 0;
}

WatchList::~WatchList()
{
    WListElem* tmp = head->next;
    while (tmp != head)
    {
	head->next = tmp->next;
	delete tmp;
	tmp = head->next;
    }
    delete head;
}

void
WatchList::insert(WListElem* elem)
{
    elem->next = head;
    elem->prev = head->prev;
    head->prev->next = elem;
    head->prev = elem;
}
 
void WatchList::removeElem(WListElem* elem)
{
    WListElem* lpp;
    WListElem* lp;

    for (lpp = head; (lp = lpp->next) != head; lpp = lpp->next)
    {
	if (lp == elem)
	{
	    lpp->next = lp->next;
	    lp->next->prev = lpp;
	    lp->prev = lp->next = lp;
	    break;
	}
    }
}