//**************************************************************************************
// Filename:	AStdNew.h
//				Part of Contextual Menu Workshop by Abracode Inc.
//				http://free.abracode.com/cmworkshop/
// Copyright © 2003 Abracode, Inc.  All rights reserved.
//
// Description:	Extension to David Catmull's ACCELA Mac toolbox C++ wrapper library
//**************************************************************************************

#pragma once

#include "AMemoryCommon.h"
#include "CThrownResult.h"


template <class T>
class AStdNew
{
public:
		AStdNew()
			: mObject(NULL), mIsOwner(kMemObj_NotOwned) {}

		AStdNew(T *inObj, EMemObjOwnershipType inIsOwner = kMemObj_Owned)
			: mObject(inObj), mIsOwner(inIsOwner) { }
		
		//copy constructor - only shallow copy is allowed here
		//the object is detached from the original
		AStdNew(const AStdNew& inOrig)
			: mObject(NULL), mIsOwner(kMemObj_NotOwned)
		{
			EMemObjOwnershipType isOwner = inOrig.mIsOwner;
			Reset(inOrig.Detach(), isOwner );
		}

	virtual
		~AStdNew() { Dispose(); }

		//object assignment as a shallow copy with ownership change
	AStdNew&
		operator=(
				const AStdNew& inObj)
		{
			EMemObjOwnershipType isOwner = inObj.mIsOwner;
			Reset(inObj.Detach(), isOwner );
			return *this;
		}

		//plain pointer assignment with ownership taking, no copy
		//inObj must be allocated with "new"
	AStdNew&
		operator=(
				const T* inObj)
		{
			Reset(inObj, kMemObj_Owned);
			return *this;
		}

	T *
		Get() const
		{
			return mObject;
		}

		operator T*() const
		{
			return mObject;
		}
		
	T&
		operator * () const
		{
			return *mObject;
		}

	T*
		operator -> () const
		{
			return mObject;
		}

	T *
		Detach() const
		{
			mIsOwner = kMemObj_NotOwned;
			return mObject;
		}

	void
		Reset(
				T *inObject,
				EMemObjOwnershipType inIsOwner = kMemObj_Owned)
		{
			if ((mIsOwner == kMemObj_Owned) && (mObject != NULL) && (inObject != mObject)) DisposeSelf();
			mObject = inObject;
			mIsOwner = inIsOwner;
		}

	void
		Dispose()
		{
			if (mObject != NULL)
			{
				if(mIsOwner == kMemObj_Owned) DisposeSelf();
				mObject = NULL;
			}
			mIsOwner = kMemObj_NotOwned;
		}

	static void
		DisposeProc(void *inObj)
		{
			if(inObj != NULL)
			{
				T** objPtr = reinterpret_cast<T **>(inObj);
				delete *objPtr;
				*objPtr = NULL;
			}
		}

protected:

	void
		DisposeSelf()
		{
			delete mObject;
		}

protected:
	T *mObject;
	mutable EMemObjOwnershipType mIsOwner;
};