watchlst.h

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 
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 * 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 
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 * contents of the file.  
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
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 * ***** END LICENSE BLOCK ***** */ 

#ifndef _WATCHLIST_H_
#define _WATCHLIST_H_

class WListElem 
{
public:
		WListElem();
		~WListElem();

    WListElem*	prev;
    WListElem*	next;
    void*	data;
};

class WatchList 
{
public:
    WatchList();
    ~WatchList();
    
    void	insert(WListElem*);
    void	removeElem(WListElem*);
    int		empty();
    WListElem*	head;
};

inline
WListElem::~WListElem()
{
}

inline int
WatchList::empty()
{
    return (head->prev == head->next && head->next == head);
}

class	WatchList_iterator
{
public:
			WatchList_iterator(WatchList*);
    WListElem*		operator*();
    WListElem*		operator++();
private:
    WListElem*		_h;
    WListElem*		_e;
    WListElem*		_n;
};

inline
WatchList_iterator::WatchList_iterator(WatchList* l)
{
   _h = l->head; 
   _e = l->head->next;
   _n = l->head->next->next;
}

inline WListElem*
WatchList_iterator::operator*()
{
    return (_e != _h) ? _e : 0;
}

inline WListElem*
WatchList_iterator::operator++()
{
    _e = _n;
    _n = _n->next;
    return _e;
}
#endif /* _WATCHLIST_H_ */