--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/networksecurity/ipsec/ipsec6/inc/circular.h	Tue Jan 26 15:23:49 2010 +0200
@@ -0,0 +1,83 @@
+// Copyright (c) 2005-2009 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:
+// circular.h - Basic circluar list for IPSEC
+// @internalComponent	for IPSEC
+//
+
+
+
+/**
+ @internalComponent
+*/
+#ifndef __CIRCULAR_H__
+#define __CIRCULAR_H__
+
+#include <e32def.h>
+
+class RCircularList
+	/**
+	* Circular list.
+	*
+	* This is a double linked list without a specific "head".
+	* An element may be alone in it's list (both links point
+	* to self). The list is never empty, it always includes
+	* the object itself.
+	*/
+	{
+public:
+	RCircularList();
+	~RCircularList();
+	RCircularList(RCircularList &aList);
+	void Attach(RCircularList &aList);
+	void Detach();
+	inline TBool IsDetached() const
+		/**
+		* Return ETrue if this is the only item in the list.
+		*/
+		{
+		return iNext == this;
+		}
+	RCircularList *iPrev;	//< Previous in the ring (never NULL)
+	RCircularList *iNext;	//< Next in the rign (never NULL)
+	};
+
+class TCircularListIter
+	/**
+	* Iterate over the objects in the list.
+	*
+	* The initial element in construction of the iterator is treated
+	* as a traditional list head. The iterator gives the other objects
+	* in the list (if any).
+	*
+	* If the initial element is alone in the ciruclar list, the
+	* first application of ++ returns NULL (e.g. the list contains
+	* the only the "head", which is never returned by this iterator).
+	*/
+	{
+public:
+	inline TCircularListIter(const RCircularList &aList) : iMark(aList), iNext(aList.iNext)
+		/**
+		* Construct iterator.
+		*
+		* @param aList	The head element.
+		*/
+		{}
+	RCircularList* operator++(TInt);
+private:
+	const RCircularList &iMark;	//< The designated list "head" element.
+	RCircularList *iNext; 		//< The next element to return with ++ (or "head", if at end of list).
+	};
+
+#endif
+