--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-F765C7EB-A8C6-50C0-B350-85BE04C8984F.dita	Wed Mar 31 11:11:55 2010 +0100
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"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: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-F765C7EB-A8C6-50C0-B350-85BE04C8984F" xml:lang="en"><title>Doubly
+linked lists</title><shortdesc>This document is a introduction to doubly linked lists.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>A doubly linked list is one where each element has pointers forwards to
+the next element and backwards to the previous element. The list is circular
+- the last element points forwards to an anchor point, and the anchor point
+points back to the last element. </p>
+<p>Anchor points are always referred to as <i>headers</i>.</p>
+<p>A doubly linked list is useful for maintaining a circular queue of items.</p>
+<fig id="GUID-1D25A6C6-B294-554E-9EDD-20F8BA05FB07">
+<image href="GUID-B0391618-0681-5E4E-94BE-C0E24B862AEF_d0e217308_href.png" placement="inline"/>
+</fig>
+<p>Doubly linked lists involve the creation and use of the classes:</p>
+<ul>
+<li id="GUID-68B5EDB3-EE3B-5186-9F79-CE1F307B8DA1"><p><codeph>TDblQueLink</codeph> </p> </li>
+<li id="GUID-5F281C65-DD6E-5862-A465-C11D8A515CFA"><p><codeph>TDblQue&lt;class
+T&gt;</codeph> </p> </li>
+<li id="GUID-7A9DD0CC-4F91-5C24-85FE-D91696257A5C"><p><codeph>TDblQueIter&lt;class
+T</codeph> </p> </li>
+</ul>
+<p>In practice, these classes are almost always used as components of other
+classes.</p>
+</conbody></concept>
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