99 lines
2.6 KiB
Text
99 lines
2.6 KiB
Text
Red-Black Tree
|
|
--------------
|
|
|
|
Macros
|
|
~~~~~~
|
|
|
|
`RB_RED`::
|
|
`RB_BLACK`::
|
|
Used to mark the color of a `rbnode`.
|
|
|
|
`RBTREE_INIT`::
|
|
Initialize a `rbtree` structure. +
|
|
should only be used with the declaration like:
|
|
+
|
|
----
|
|
rbtree tree = RBTREE_INIT(...);
|
|
----
|
|
+
|
|
the arguments are pointers to callback functions, in order: `delete_fn`, `update_fn`, `cmp_fn`
|
|
|
|
Data structures
|
|
~~~~~~~~~~~~~~~
|
|
|
|
* `rbnode`
|
|
|
|
The binary tree node.
|
|
|
|
`key`::
|
|
The key of this node
|
|
|
|
`data`::
|
|
pointer to the data associated with the key
|
|
|
|
`child`::
|
|
pointers to the left and right child to this node
|
|
|
|
`color`::
|
|
the color, should be a value of `RB_BLACK` or `RB_RED`
|
|
|
|
++++
|
|
++++
|
|
|
|
* `rbtree`
|
|
|
|
Structure that holds a tree of nodes
|
|
|
|
`root`::
|
|
Pointer to the node that is the root of the tree.
|
|
|
|
`delete_fn`::
|
|
Pointer to the function that should handle the delete routines for the `rbnode->data` pointer.
|
|
|
|
`update_fn`::
|
|
Pointer to the function that is called when the implementation performs an update of an `rbnode->data` pointer. +
|
|
The function gets the following information passed in order: old pointer, new pointer.
|
|
|
|
NOTE: You may only need this if you store the data in another structure and has to keep it synchronized with the RB-tree.
|
|
|
|
`cmp_fn`::
|
|
Pointer to the function that is used to compare `rbnode->data` pointers. +
|
|
Shall return a value greater than zero if 'ptr1' > 'ptr2', a value less than zero if 'ptr1' < 'ptr2' and zero if 'ptr1' == 'ptr2'.
|
|
|
|
Functions
|
|
~~~~~~~~~
|
|
|
|
`rbtree_insert()`::
|
|
|
|
Creates and inserts a new node in the tree. +
|
|
If provided, calls `rbtree->update_fn` and `rbtree->delete_fn` if a node should be updated. +
|
|
Returns a nonzero value if a new node was inserted, zero if 'key' already existed and that node was updated.
|
|
|
|
NOTE: The memory pointed to by the 'data' pointer is *not* copied so you must ensure that it has a infinite lifetime.
|
|
|
|
`rbtree_delete()`::
|
|
|
|
Deletes a node from the tree. if provided, calls `rbtree->delete_fn` for the node. +
|
|
Returns non zero if a node was removed. zero otherwise.
|
|
|
|
`rbtree_free()`::
|
|
|
|
Deletes the whole tree. if provided, calls `rbtree->delete_fn` for every node.
|
|
|
|
`rbtree_walk()`::
|
|
|
|
Walks the tree in in-order and calls the 'action' callback function for every node.
|
|
|
|
`rbtree_search()`::
|
|
|
|
Searches the tree for 'key'. +
|
|
Returns a pointer to the node if found else `NULL`.
|
|
|
|
`rbtree_cmp_search()`::
|
|
|
|
Searches the tree by compareing 'cmpdata' and `rbnode->data` to find a match. +
|
|
Returns the node if found, `NULL` otherwise.
|
|
|
|
`rbtree_is_empty()`::
|
|
|
|
Checks if a tree is empty, retruns zero if the tree is empty, nonzero otherwise.
|