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An STL like Tree Class

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Introduction

For more than a year and a half I have had to use some kind of multi-node tree to do something. However, all I found from the Internet are binary trees or equivalents. I therefore decided to write my own. Because I had to finish it pretty fast, I spent only two days for it, so it may be buggy.

In the project, it has three classes working like in STL container-iterator style.
Collapse Copy Code
      
        template
      
      
        <
      
      
        class
      
       Key, 
      
        class
      
       T
      
        >
      
      
        class
      
       Tree

      
        template
      
      
        <
      
      
        class
      
       Key, 
      
        class
      
       T
      
        >
      
      
        class
      
       Tree_iterator

      
        template
      
      
        <
      
      
        class
      
       Key, 
      
        class
      
       T
      
        >
      
      
        class
      
       TreeNode
    

A tree contains many tree nodes, while tree nodes contain data. Tree nodes of a tree are called children. In the design each node is assigned a level and the root node is of level 1. Tree_iterator is for navigation within the tree. Two tree-walk styles are defined. One walks down from the root node, while the other one use post-style to walk through all children of the tree. For each walk action, a tree_iterator is returned, so the user can use the iterator to reference the tree node and get the data.

I wrapped all the classes under the namespace Tiffany. For example, declaration of the tree with key type of wstring , and node data type of string, and add two levels of element is like:

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      Tiffany::Tree
      
        <
      
      wstring, 
      
        string
      
      
        >
      
       x(L
      
        "
      
      
        Node 1"
      
      , 
      
        "
      
      
        Root"
      
      );

px = x.AddChild(L
      
        "
      
      
        Key1"
      
      ,
      
        "
      
      
        A"
      
      );
px1 = x.AddChild(px, L
      
        "
      
      
        Key2"
      
      , 
      
        "
      
      
        1"
      
      );

    

For a walk down action, you can limit it to a part of a tree ("sub-tree") by using the function SetSubTreePivot(px) , and you can set the pivot to point back to the root node by calling SetWalkDownRootPivot. Try it out!. You can even delete part of the tree by calling DelSubTree() .

Unfortunately I didn't have much time to prepare this document, but it should be obvious how to the classes.

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An STL like Tree Class


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