// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// e32\euser\us_ref.cpp

// 

//

#include "us_std.h"

/**

Frees the memory holding the contained object.

*/

EXPORT_C void RRefBase::Free()

	{

	if (iPtr)

		{

		if (--iPtr[-1]==0)

			User::Free(iPtr-1);

		iPtr=NULL;

		}

	}

/**

Creates a copy of an object, which is to be contained by

this reference object.

@param aPtr  A pointer to memory holding a copy of the object.

@param aSize The size of the memory required to hold the object.

*/

EXPORT_C void RRefBase::DoAlloc(const TAny *aPtr,TInt aSize)

	{

	__ASSERT_ALWAYS(aSize>=0,Panic(ERefAllocSizeNegative));

	Free();

	iPtr=(TInt *)User::Alloc(aSize+sizeof(TInt));

	if (iPtr!=NULL)

		{

		iPtr++;

		iPtr[-1]=1;

		Mem::Copy(iPtr,aPtr,aSize);

		}

	}

/**

Creates a copy of an object, which is to be contained by

this reference object, and leaves on error.

@param aPtr  A pointer to memory holding a copy of the object.

@param aSize The size of the memory required to hold the object.

*/

EXPORT_C void RRefBase::DoAllocL(const TAny *aPtr,TInt aSize)

	{

	DoAlloc(aPtr,aSize);

	User::LeaveIfNull(iPtr);

	}

/**

Provides an implementation for the RRef class copy

constructor and assignment operator.

@param aRef The reference object to be copied.

@see RRef

*/

EXPORT_C void RRefBase::Copy(const RRefBase &aRef)

	{

	if (this!=(&aRef))

		{

		Free();

		iPtr=aRef.iPtr;

		iPtr[-1]++;

		}

	}