commsfwsupport/commselements/virtualconstructors/inc/vc.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 15 Jul 2010 20:01:43 +0300
branchRCL_3
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// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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/**
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 @file
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 @internalTechnology
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*/
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#ifndef SYMBIAN_VC_H
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#define SYMBIAN_VC_H
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#include <e32base.h>
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#include <e32std.h>
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#include <ecom/implementationproxy.h>	// for TImplementationProxy
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//VIP == "virtual-ctor in place"
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#define DECLARE_MVIP_CTR(class_name)				\
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	static class_name* PlacementNew(TDes8& aBuff);	
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#define DEFINE_MVIP_CTR(class_name)					\
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class_name* class_name::PlacementNew(TDes8& aBuff)	\
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	{												\
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	return new(aBuff) class_name;					\
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	}
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#define MVIP_CTR_ENTRY(aInterfaceUid, aMessageClass)  {{aInterfaceUid},(TProxyNewLPtr)(aMessageClass::PlacementNew)}
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namespace Meta
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{
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	struct STypeId;
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}
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namespace VC
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{
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class CVirtualCtorBase : public CBase
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	{
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public:
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	IMPORT_C CVirtualCtorBase();
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	IMPORT_C ~CVirtualCtorBase();
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	IMPORT_C void RegisterInterfaceL(TUid aInterfaceId, TInt aNumCtors, const TImplementationProxy* aCtorTable);
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	IMPORT_C void DeregisterInterface(TUid aInterfaceId);
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	IMPORT_C TBool IsInterfaceRegistered(TUid aInterfaceId) const;
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protected:
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	IMPORT_C TProxyNewLPtr FindRawCtor(const Meta::STypeId& aType) const;
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private:
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	class TCtorTable
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		{
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	public:
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		TCtorTable(TUid aInterfaceId, TInt aNumCtors, const TImplementationProxy* aCtorTable)
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		: iInterfaceId(aInterfaceId), 
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		  iNumCtors(aNumCtors), 
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		  iRegisteredCount(1),
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		  iCtorTable(aCtorTable)
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			{
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			}
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	public:
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		TUid iInterfaceId;
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		TInt iNumCtors;		
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		mutable TInt iRegisteredCount;
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		const TImplementationProxy* iCtorTable;		
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		};
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	typedef RArray<TCtorTable> TCtorTableList;
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	TCtorTableList iCtorTableList;
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private:
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	const TCtorTable* FindCtorTable(TUid aInterfaceId, TInt& aIndex) const;
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	};
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typedef TAny* (*TInPlaceNewPtr)(TDes8& aBuff);
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class CVirtualCtorInPlace : public CVirtualCtorBase
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	{
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public:
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	//Constructs only from the type
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	IMPORT_C TAny* New(const Meta::STypeId& aType, TDes8& aBuff) const;
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	inline const TInPlaceNewPtr FindCtor(const Meta::STypeId& aType) const
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		{
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		return reinterpret_cast<const TInPlaceNewPtr>(FindRawCtor(aType));
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		}
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	};
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} //namespace VC
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#endif
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//SYMBIAN_VC_H
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