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Balanced Binary Trees

<!-- ##### SECTION Short_Description ##### -->
a sorted collection of key/value pairs optimized for searching
and traversing in order.

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<para>
The #GTree structure and its associated functions provide a sorted collection
of key/value pairs optimized for searching and traversing in order.
</para>
<para>
To create a new #GTree use g_tree_new().
</para>
<para>
To insert a key/value pair into a #GTree use g_tree_insert().
</para>
<para>
To lookup the value corresponding to a given key, use g_tree_lookup() and
g_tree_lookup_extended().
</para>
<para>
To find out the number of nodes in a #GTree, use g_tree_nnodes().
To get the height of a #GTree, use g_tree_height().
</para>
<para>
To traverse a #GTree, calling a function for each node visited in the
traversal, use g_tree_foreach().
</para>
<para>
To remove a key/value pair use g_tree_remove().
</para>
<para>
To destroy a #GTree, use g_tree_destroy().
</para>

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<para>

</para>

<!-- ##### STRUCT GTree ##### -->
<para>
The <structname>GTree</structname> struct is an opaque data structure representing a
<link linkend="glib-Balanced-Binary-Trees">Balanced Binary Tree</link>.
It should be accessed only by using the following functions.
</para>


<!-- ##### FUNCTION g_tree_new ##### -->
<para>

</para>

@key_compare_func: 
@Returns: 


<!-- ##### FUNCTION g_tree_new_with_data ##### -->
<para>

</para>

@key_compare_func: 
@key_compare_data: 
@Returns: 


<!-- ##### FUNCTION g_tree_new_full ##### -->
<para>

</para>

@key_compare_func: 
@key_compare_data: 
@key_destroy_func: 
@value_destroy_func: 
@Returns: 


<!-- ##### FUNCTION g_tree_insert ##### -->
<para>

</para>

@tree: 
@key: 
@value: 


<!-- ##### FUNCTION g_tree_replace ##### -->
<para>

</para>

@tree: 
@key: 
@value: 


<!-- ##### FUNCTION g_tree_nnodes ##### -->
<para>

</para>

@tree: 
@Returns: 


<!-- ##### FUNCTION g_tree_height ##### -->
<para>

</para>

@tree: 
@Returns: 


<!-- ##### FUNCTION g_tree_lookup ##### -->
<para>

</para>

@tree: 
@key: 
@Returns: 


<!-- ##### FUNCTION g_tree_lookup_extended ##### -->


@tree: 
@lookup_key: 
@orig_key: 
@value: 
@Returns: 


<!-- ##### FUNCTION g_tree_foreach ##### -->
<para>

</para>

@tree: 
@func: 
@user_data: 


<!-- ##### FUNCTION g_tree_traverse ##### -->
<para>

</para>

@tree: 
@traverse_func: 
@traverse_type: 
@user_data: 


<!-- ##### USER_FUNCTION GTraverseFunc ##### -->
<para>
Specifies the type of function passed to g_tree_traverse().
It is passed the key and value of each node, together with
the @user_data parameter passed to g_tree_traverse().
If the function returns %TRUE, the traversal is stopped.
</para>

@key: a key of a #GTree node.
@value: the value corresponding to the key.
@data: user data passed to g_tree_traverse().
@Returns: %TRUE to stop the traversal.


<!-- ##### ENUM GTraverseType ##### -->
<para>
Specifies the type of traveral performed by g_tree_traverse(),
g_node_traverse() and g_node_find().
</para>

@G_IN_ORDER: vists a node's left child first, then the node itself, then its
  right child. This is the one to use if you want the output sorted according
  to the compare function.
@G_PRE_ORDER: visits a node, then its children.
@G_POST_ORDER: visits the node's children, then the node itself.
@G_LEVEL_ORDER: is not implemented for
  <link linkend="glib-Balanced-Binary-Trees">Balanced Binary Trees</link>.
  For <link linkend="glib-N-ary-Trees">N-ary Trees</link>, it vists the root
  node first, then its children, then its grandchildren, and so on. Note that
  this is less efficient than the other orders.

<!-- ##### FUNCTION g_tree_search ##### -->
<para>

</para>

@tree: 
@search_func: 
@user_data: 
@Returns: 


<!-- ##### FUNCTION g_tree_remove ##### -->
<para>

</para>

@tree: 
@key: 


<!-- ##### FUNCTION g_tree_steal ##### -->
<para>

</para>

@tree: 
@key: 


<!-- ##### FUNCTION g_tree_destroy ##### -->
<para>

</para>

@tree: