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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="SECTION0010635000000000000000"><tt>AttachSubtree</tt> and <tt>DetachSubtree</tt> Member Functions</A></H3>
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Program <A HREF="page280.html#proggentree2c" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page280.html#proggentree2c"><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 defines two functions for
manipulating the subtrees of a general tree.
The purpose of the <tt>AttachSubtree</tt> member function is to
add the specified subtree to the root of a given tree.
This function takes as its lone argument
a reference to a <tt>GeneralTree</tt> instance which is to be attached.
The <tt>AttachSubtree</tt> routine
simply appends to the linked list a pointer to the tree to be attached
and then adds one the <tt>degree</tt> variable.
The running time for <tt>AttachSubtree</tt> is <I>O</I>(1).
<P>
Similarly, the <tt>DetachSubtree</tt> member function
removes the specified subtree from the given tree.
This function takes as its lone argument
a reference to a <tt>GeneralTree</tt> instance which is to be removed.
It removes the appropriate pointer from the linked list
and then subtracts one from the <tt>degree</tt> variable.
The running time for <tt>DetachSubtree</tt> is <I>O</I>(<I>d</I>) in the worst case,
where <IMG WIDTH=80 HEIGHT=23 ALIGN=MIDDLE ALT="tex2html_wrap_inline63952" SRC="img1176.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img1176.gif" >.
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