sl@0: // Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // e32\euser\us_ref.cpp
sl@0: // 
sl@0: //
sl@0: 
sl@0: #include "us_std.h"
sl@0: 
sl@0: 
sl@0: 
sl@0: /**
sl@0: Frees the memory holding the contained object.
sl@0: */
sl@0: EXPORT_C void RRefBase::Free()
sl@0: 	{
sl@0: 
sl@0: 	if (iPtr)
sl@0: 		{
sl@0: 		if (--iPtr[-1]==0)
sl@0: 			User::Free(iPtr-1);
sl@0: 		iPtr=NULL;
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: /**
sl@0: Creates a copy of an object, which is to be contained by
sl@0: this reference object.
sl@0: 
sl@0: @param aPtr  A pointer to memory holding a copy of the object.
sl@0: @param aSize The size of the memory required to hold the object.
sl@0: */
sl@0: EXPORT_C void RRefBase::DoAlloc(const TAny *aPtr,TInt aSize)
sl@0: 	{
sl@0: 
sl@0: 	__ASSERT_ALWAYS(aSize>=0,Panic(ERefAllocSizeNegative));
sl@0: 	Free();
sl@0: 	iPtr=(TInt *)User::Alloc(aSize+sizeof(TInt));
sl@0: 	if (iPtr!=NULL)
sl@0: 		{
sl@0: 		iPtr++;
sl@0: 		iPtr[-1]=1;
sl@0: 		Mem::Copy(iPtr,aPtr,aSize);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: /**
sl@0: Creates a copy of an object, which is to be contained by
sl@0: this reference object, and leaves on error.
sl@0: 
sl@0: @param aPtr  A pointer to memory holding a copy of the object.
sl@0: @param aSize The size of the memory required to hold the object.
sl@0: */
sl@0: EXPORT_C void RRefBase::DoAllocL(const TAny *aPtr,TInt aSize)
sl@0: 	{
sl@0: 
sl@0: 	DoAlloc(aPtr,aSize);
sl@0: 	User::LeaveIfNull(iPtr);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: /**
sl@0: Provides an implementation for the RRef class copy
sl@0: constructor and assignment operator.
sl@0: 
sl@0: @param aRef The reference object to be copied.
sl@0: 
sl@0: @see RRef
sl@0: */
sl@0: EXPORT_C void RRefBase::Copy(const RRefBase &aRef)
sl@0: 	{
sl@0: 
sl@0: 	if (this!=(&aRef))
sl@0: 		{
sl@0: 		Free();
sl@0: 		iPtr=aRef.iPtr;
sl@0: 		iPtr[-1]++;
sl@0: 		}
sl@0: 	}
sl@0: