// 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]++;

 		}

 	}