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<b>Data Structures and Algorithms 
with Object-Oriented Design Patterns in C++</b><br>
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<H2><A NAME="SECTION0010610000000000000000">Tree Traversals</A></H2>
<A NAME="sectreesimpltrav">&#160;</A>
<P>
The abstract <tt>Tree</tt> class provides default implementations
for both the <tt>DepthFirstTraversal</tt>
and <tt>BreadthFirstTraversal</tt> member functions.
Both of these implementations call pure virtual member functions
such as <tt>Key</tt> and <tt>Subtree</tt>.
In effect, they are <em>abstract algorithms</em><A NAME=16186>&#160;</A>.
An abstract algorithm describes behavior in the absence of implementation!
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