<?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-2364CAB0-E19E-5EBB-837F-F6484642C2E4" xml:lang="en"><title>Headers</title><shortdesc>A header forms the anchor point for a singly linked list.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>A header forms the anchor point for a singly linked list. In common with
the elements of the list, the header includes <i>link</i> objects as components.</p>
<p>The header includes the following functionality:</p>
<ul>
<li id="GUID-813BAAF4-F526-5E08-8165-5361D641A097"><p>allows elements to be
added to the start and end of a singly linked list, but <i>not</i> to the
middle.</p> </li>
<li id="GUID-5001CEBA-CCBE-5F6C-B0CD-A15DF0BDB8B9"><p>tests if an element
is at the start or end of a list.</p> </li>
<li id="GUID-7E459E1C-2BA8-54D6-9C1C-02AA13C8A77A"><p>returns pointers to
elements at the start or the end of a list.</p> </li>
<li id="GUID-01A424E1-AFA9-55D1-B61E-DA1DE372F9D0"><p>removes elements from
the list.</p> </li>
</ul>
<p>A header is an instance of the templated class <codeph>TSglQue&lt;class
T&gt;</codeph>.</p>
</conbody></concept>