1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/ossrv/lowlevellibsandfws/genericusabilitylib/inc/isbaseof.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,58 @@
     1.4 +// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +//
    1.18 +
    1.19 +
    1.20 +#ifndef ISBASEOF_H
    1.21 +#define ISBASEOF_H
    1.22 +
    1.23 +
    1.24 +// Provisional implementation of a construct that allows to determine
    1.25 +// at compile time whether a class type is derived from another class
    1.26 +// type
    1.27 +
    1.28 +// To be redefined using std::tr1:is_base_of when a TR1 implementation
    1.29 +// becomes available for use with Symbian OS.
    1.30 +
    1.31 +
    1.32 +// Implementation construct - do not use
    1.33 +template<typename B, typename D>
    1.34 +class TIsBaseOf
    1.35 +	{
    1.36 +  private:
    1.37 +	typedef TUint8 TIsDerived;
    1.38 +
    1.39 +	class TIsNotDerived
    1.40 +		{
    1.41 +		TUint8 iPadding[2];
    1.42 +		};
    1.43 +
    1.44 +
    1.45 +	static TIsDerived ReturnType(B*);
    1.46 +	static TIsNotDerived ReturnType(...);
    1.47 +
    1.48 +  public:
    1.49 +
    1.50 +	enum
    1.51 +	{
    1.52 +		EValue = sizeof(ReturnType(static_cast<D*>(0))) == sizeof(TIsDerived) ? 1 : 0
    1.53 +	};
    1.54 +	};
    1.55 +
    1.56 +
    1.57 +#define IS_BASE_OF(BaseType, DerivedType) TIsBaseOf<BaseType, DerivedType>::EValue
    1.58 +
    1.59 +
    1.60 +#endif //! ISBASEOF_H
    1.61 +