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Imported MaNGOS revision 6767 from http://mangos.svn.sourceforge.net/svnroot/mangos/trunk/

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TheLuda 2008-10-14 00:29:20 +02:00
parent d767495d5b
commit 800ee76535
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src/framework/Utilities/LinkedReference/Reference.h Normal file
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/*
* Copyright (C) 2005-2008 MaNGOS <http://getmangos.com/>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _REFERENCE_H
#define _REFERENCE_H
#include "Utilities/LinkedList.h"
//=====================================================
template <class TO, class FROM> class Reference : public LinkedListElement
{
private:
TO* iRefTo;
FROM* iRefFrom;
protected:
// Tell our refTo (target) object that we have a link
virtual void targetObjectBuildLink() = 0;
// Tell our refTo (taget) object, that the link is cut
virtual void targetObjectDestroyLink() = 0;
// Tell our refFrom (source) object, that the link is cut (Target destroyed)
virtual void sourceObjectDestroyLink() = 0;
public:
Reference() { iRefTo = NULL; iRefFrom = NULL; }
virtual ~Reference() {}
// Create new link
inline void link(TO* toObj, FROM* fromObj)
{
assert(fromObj); // fromObj MUST not be NULL
if(isValid())
unlink();
if(toObj != NULL)
{
iRefTo = toObj;
iRefFrom = fromObj;
targetObjectBuildLink();
}
}
// We don't need the reference anymore. Call comes from the refFrom object
// Tell our refTo object, that the link is cut
inline void unlink() { targetObjectDestroyLink(); delink(); iRefTo = NULL; iRefFrom = NULL; }
// Link is invalid due to destruction of referenced target object. Call comes from the refTo object
// Tell our refFrom object, that the link is cut
inline void invalidate() // the iRefFrom MUST remain!!
{
sourceObjectDestroyLink(); delink(); iRefTo = NULL;
}
inline bool isValid() const // Only check the iRefTo
{
return iRefTo != NULL;
}
Reference<TO,FROM>* next() { return((Reference<TO,FROM>*)LinkedListElement::next()); }
Reference<TO,FROM>* prev() { return((Reference<TO,FROM>*)LinkedListElement::prev()); }
inline TO* operator ->() const { return iRefTo; }
inline TO* getTarget() const { return iRefTo; }
inline FROM* getSource() const { return iRefFrom; }
};
//=====================================================
#endif