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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="SECTION0013412000000000000000">Constructors and Destructor</A></H3>
<P>
Program <A HREF="page408.html#progpartition1c" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page408.html#progpartition1c"><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 code for the <tt>PartitionTree</tt> constructor.
The constructor creates a tree comprised of a single node.
It takes an argument which specifies the element of the
universal set that the node is to represent.
The <tt>parent</tt> field is set to zero to indicate that the node has no parent.
Consequently, the node is a root node.
Finally, the <tt>rank</tt> field is initialized to zero.
The running time of the constructor is <I>O</I>(1).
<P>
<P><A NAME="29331"> </A><A NAME="progpartition1c"> </A> <IMG WIDTH=575 HEIGHT=410 ALIGN=BOTTOM ALT="program29241" SRC="img1675.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img1675.gif" ><BR>
<STRONG>Program:</STRONG> <tt>PartitionTree</tt> and <tt>PartitionAsForest</tt> Class Constructor and Destructor Definitions<BR>
<P>
<P>
Program <A HREF="page408.html#progpartition1c" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page408.html#progpartition1c"><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> also shows the constructor and destructor for
the <tt>PartitionAsForest</tt> class.
The constructor takes a single argument <I>N</I>
which specifies that the universe shall be <IMG WIDTH=150 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline67278" SRC="img1605.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img1605.gif" >.
It creates an initial partition of the universe consisting of <I>N</I> parts.
Each part contains one element of the universal set
and, therefore, comprises a one-node tree.
The <tt>PartitionAsForest</tt> is a container
and the <tt>PartitionTree</tt> instances that the constructor creates
are the contained objects.
<P>
The destructor is responsible for deleting the objects in the container.
I.e., it deletes all the <tt>PartitionTree</tt> instances that were
created in the constructor.
Both the constructor and destructor run in <I>O</I>(<I>N</I>) time,
where <I>N</I> is the number of elements in the universe.
<P>
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