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/*
* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
* Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
* Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
*/
#ifndef _REFERENCE_H
#define _REFERENCE_H
#include "Dynamic/LinkedList.h"
#include "Errors.h" // for ASSERT
//=====================================================
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 = nullptr; iRefFrom = nullptr; }
virtual ~Reference() = default;
// Create new link
void link(TO* toObj, FROM* fromObj)
{
ASSERT(fromObj); // fromObj MUST not be nullptr
if (isValid())
{
unlink();
}
if (toObj != nullptr)
{
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
void unlink()
{
targetObjectDestroyLink();
delink();
iRefTo = nullptr;
iRefFrom = nullptr;
}
// 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
void invalidate() // the iRefFrom MUST remain!!
{
sourceObjectDestroyLink();
delink();
iRefTo = nullptr;
}
[[nodiscard]] bool isValid() const // Only check the iRefTo
{
return iRefTo != nullptr;
}
Reference<TO, FROM>* next() { return ((Reference<TO, FROM>*) LinkedListElement::next()); }
[[nodiscard]] Reference<TO, FROM> const* next() const { return ((Reference<TO, FROM> const*) LinkedListElement::next()); }
Reference<TO, FROM>* prev() { return ((Reference<TO, FROM>*) LinkedListElement::prev()); }
[[nodiscard]] Reference<TO, FROM> const* prev() const { return ((Reference<TO, FROM> const*) LinkedListElement::prev()); }
Reference<TO, FROM>* nocheck_next() { return ((Reference<TO, FROM>*) LinkedListElement::nocheck_next()); }
[[nodiscard]] Reference<TO, FROM> const* nocheck_next() const { return ((Reference<TO, FROM> const*) LinkedListElement::nocheck_next()); }
Reference<TO, FROM>* nocheck_prev() { return ((Reference<TO, FROM>*) LinkedListElement::nocheck_prev()); }
[[nodiscard]] Reference<TO, FROM> const* nocheck_prev() const { return ((Reference<TO, FROM> const*) LinkedListElement::nocheck_prev()); }
TO* operator ->() const { return iRefTo; }
[[nodiscard]] TO* getTarget() const { return iRefTo; }
[[nodiscard]] FROM* GetSource() const { return iRefFrom; }
};
//=====================================================
#endif
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