// 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