--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lowlevellibsandfws/genericusabilitylib/inc/isbaseof.h	Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,58 @@
+// 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
+