// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of "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:

 //

 #ifndef ISBASEOF_H

 #define ISBASEOF_H

 // Provisional implementation of a construct that allows to determine

 // at compile time whether a class type is derived from another class

 // type

 // To be redefined using std::tr1:is_base_of when a TR1 implementation

 // becomes available for use with Symbian OS.

 // Implementation construct - do not use

 template<typename B, typename D>

 class TIsBaseOf

 	{

   private:

 	typedef TUint8 TIsDerived;

 	class TIsNotDerived

 		{

 		TUint8 iPadding[2];

 		};

 	static TIsDerived ReturnType(B*);

 	static TIsNotDerived ReturnType(...);

   public:

 	enum

 	{

 		EValue = sizeof(ReturnType(static_cast<D*>(0))) == sizeof(TIsDerived) ? 1 : 0

 	};

 	};

 #define IS_BASE_OF(BaseType, DerivedType) TIsBaseOf<BaseType, DerivedType>::EValue

 #endif //! ISBASEOF_H