95 lines
3.8 KiB
C++
95 lines
3.8 KiB
C++
/*
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* Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
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*
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* Copyright (C) 2008-2010 Trinity <http://www.trinitycore.org/>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _REFERENCE_H
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#define _REFERENCE_H
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#include "Utilities/LinkedList.h"
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//=====================================================
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template <class TO, class FROM> class Reference : public LinkedListElement
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{
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private:
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TO* iRefTo;
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FROM* iRefFrom;
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protected:
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// Tell our refTo (target) object that we have a link
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virtual void targetObjectBuildLink() = 0;
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// Tell our refTo (taget) object, that the link is cut
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virtual void targetObjectDestroyLink() = 0;
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// Tell our refFrom (source) object, that the link is cut (Target destroyed)
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virtual void sourceObjectDestroyLink() = 0;
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public:
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Reference() { iRefTo = NULL; iRefFrom = NULL; }
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virtual ~Reference() {}
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// Create new link
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void link(TO* toObj, FROM* fromObj)
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{
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assert(fromObj); // fromObj MUST not be NULL
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if(isValid())
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unlink();
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if(toObj != NULL)
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{
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iRefTo = toObj;
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iRefFrom = fromObj;
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targetObjectBuildLink();
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}
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}
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// We don't need the reference anymore. Call comes from the refFrom object
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// Tell our refTo object, that the link is cut
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void unlink() { targetObjectDestroyLink(); delink(); iRefTo = NULL; iRefFrom = NULL; }
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// Link is invalid due to destruction of referenced target object. Call comes from the refTo object
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// Tell our refFrom object, that the link is cut
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void invalidate() // the iRefFrom MUST remain!!
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{
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sourceObjectDestroyLink(); delink(); iRefTo = NULL;
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}
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bool isValid() const // Only check the iRefTo
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{
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return iRefTo != NULL;
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}
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Reference<TO,FROM> * next() { return((Reference<TO,FROM> *) LinkedListElement::next()); }
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Reference<TO,FROM> const * next() const { return((Reference<TO,FROM> const *) LinkedListElement::next()); }
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Reference<TO,FROM> * prev() { return((Reference<TO,FROM> *) LinkedListElement::prev()); }
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Reference<TO,FROM> const * prev() const { return((Reference<TO,FROM> const *) LinkedListElement::prev()); }
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Reference<TO,FROM> * nocheck_next() { return((Reference<TO,FROM> *) LinkedListElement::nocheck_next()); }
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Reference<TO,FROM> const * nocheck_next() const { return((Reference<TO,FROM> const *) LinkedListElement::nocheck_next()); }
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Reference<TO,FROM> * nocheck_prev() { return((Reference<TO,FROM> *) LinkedListElement::nocheck_prev()); }
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Reference<TO,FROM> const * nocheck_prev() const { return((Reference<TO,FROM> const *) LinkedListElement::nocheck_prev()); }
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TO* operator ->() const { return iRefTo; }
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TO* getTarget() const { return iRefTo; }
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FROM* getSource() const { return iRefFrom; }
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};
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//=====================================================
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#endif
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