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<TITLE>Constructor, Destructor and Purge Member Functions</TITLE>
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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="SECTION0012222000000000000000">Constructor, Destructor and <tt>Purge</tt> Member Functions</A></H3>
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Program <A HREF="page359.html#progbinheap1c" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page359.html#progbinheap1c"><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> defines the <tt>BinaryHeap</tt> class constructor.
The constructor takes a single argument of type <tt>unsigned int</tt> which
specifies the maximum capacity of the binary heap.
The argument passed on to the constructor for the <tt>array</tt> member variable.
Notice too that the array is initialized so that its positions are
numbered starting from subscript 1 rather than the default of zero.
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<P><A NAME="24930"> </A><A NAME="progbinheap1c"> </A> <IMG WIDTH=575 HEIGHT=317 ALIGN=BOTTOM ALT="program24875" SRC="img1462.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img1462.gif" ><BR>
<STRONG>Program:</STRONG> <tt>BinaryHeap</tt> Class Constructor, Destructor and <tt>Purge</tt> Member Function Definitions<BR>
<P>
<P>
The purpose of the <tt>Purge</tt> member function
of the <tt>BinaryHeap</tt> class is to delete from the priority queue
all contained and owned objects.
Pointers to the contained objects are found in the
first <IMG WIDTH=72 HEIGHT=9 ALIGN=BOTTOM ALT="tex2html_wrap_inline61308" SRC="img709.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img709.gif" > array positions.
Clearly the worst-case running time for the <tt>Purge</tt> function is
<P> <IMG WIDTH=314 HEIGHT=17 ALIGN=BOTTOM ALT="displaymath66376" SRC="img1463.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img1463.gif" ><P>
where <IMG WIDTH=65 HEIGHT=26 ALIGN=MIDDLE ALT="tex2html_wrap_inline66380" SRC="img1464.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img1464.gif" > is the worst-case time required to delete an object instance.
<P>
The implementation of the destructor for the <tt>BinaryHeap</tt> class
is trivial as it simply calls <tt>Purge</tt> to do its work.
Consequently, the destructor has the same running time as above.
<P>
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