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<b>Data Structures and Algorithms
with Object-Oriented Design Patterns in C++</b><br>
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<H3><A NAME="SECTION008125000000000000000">Positions of Items in a List</A></H3>
<P>
Program <A HREF="page182.html#proglist5h" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page182.html#proglist5h"><IMG ALIGN=BOTTOM ALT="gif" SRC="cross_ref_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cross_ref_motif.gif"></A> gives the definition of a the
<tt>ListAsLinkedList::Pos</tt> class,
the purpose of which is to record the position of an item
in an ordered list implemented as a linked list.
<P>
<P><A NAME="10557"> </A><A NAME="proglist5h"> </A> <IMG WIDTH=575 HEIGHT=161 ALIGN=BOTTOM ALT="program10216" SRC="img807.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img807.gif" ><BR>
<STRONG>Program:</STRONG> <tt>ListAsLinkedList::Pos</tt> Class Definition<BR>
<P>
<P>
The <tt>ListAsLinkedList::Pos</tt> class has two member variables--<tt>list</tt> and <tt>element</tt>.
The first is a reference to the ordered list
which contains the item of interest;
the second is a pointer to the linked-list element in which the item appears.
Notice that the implementation of the <tt>ListAsLinkedList::Pos</tt>
class is fundamentally different from the array version,
<tt>ListAsArray::Pos</tt>.
In the array version, the position was specified by an offset,
i.e, by an <em>ordinal number</em><A NAME=10230> </A>
that shows the position of the item in the ordered sequence.
In the linked-list version,
the position is specified by a pointer to the element of the linked list
in which the item is stored.
Regardless of the implementation,
both kinds of position provide exactly the same functionality--their public interfaces are identical.
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