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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.
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:
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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About the Author
