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

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 

    17 #ifndef ISBASEOF_H

    18 #define ISBASEOF_H

    19 

    20 

    21 // Provisional implementation of a construct that allows to determine

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

    23 // type

    24 

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

    26 // becomes available for use with Symbian OS.

    27 

    28 

    29 // Implementation construct - do not use

    30 template<typename B, typename D>

    31 class TIsBaseOf

    32 	{

    33   private:

    34 	typedef TUint8 TIsDerived;

    35 

    36 	class TIsNotDerived

    37 		{

    38 		TUint8 iPadding[2];

    39 		};

    40 

    41 

    42 	static TIsDerived ReturnType(B*);

    43 	static TIsNotDerived ReturnType(...);

    44 

    45   public:

    46 

    47 	enum

    48 	{

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

    50 	};

    51 	};

    52 

    53 

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

    55 

    56 

    57 #endif //! ISBASEOF_H

    58