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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-591552AB-D708-5CB5-9597-A0AF3D303178" xml:lang="en"><title>Headers</title><shortdesc>This document describes the concept of headers as regards to doubly

linked lists.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>A header forms the anchor point for a doubly linked list. In common with

the elements of the list, the header includes a <i>link</i> object as a component.</p>

<p>The header includes the following functionality:</p>

<ul>

<li id="GUID-A713D790-2003-5788-889F-E3B3D9669B0D"><p>allows elements to be

added to the start and end of a doubly linked list, but <i>not</i> to the

middle.</p> </li>

<li id="GUID-84EB986A-7501-57FF-BFD0-DB67182A3050"><p>tests if an element

is at the start or end of a list.</p> </li>

<li id="GUID-94683FD4-C576-520D-8CEC-D1D7A8978D0C"><p>returns pointers to

elements at the start or the end of a list.</p> </li>

</ul>

<p>A header is an instance of the templated class <codeph>TDblQue&lt;class

        T&gt;</codeph>.</p>

</conbody></concept>