Red-Black tree

These functions provide Red-Black tree management. More...

Data Structures
struct	_Eina_Rbtree

Macros
#define	EINA_RBTREE   Eina_Rbtree __rbtree
	recommended way to declare the inlined Eina_Rbtree in your type. More...
#define	EINA_RBTREE_GET(Rbtree)   (&((Rbtree)->__rbtree))
	access the inlined node if it was created with EINA_RBTREE.
#define	EINA_RBTREE_CONTAINER_GET(Ptr, Type)   ((Type *)((char *)Ptr - offsetof(Type, __rbtree)))
	find back the container of a red black tree.
#define	EINA_RBTREE_CMP_NODE_CB(Function)   ((Eina_Rbtree_Cmp_Node_Cb)Function)
	Cast using Eina_Rbtree_Cmp_Node_Cb.
#define	EINA_RBTREE_CMP_KEY_CB(Function)   ((Eina_Rbtree_Cmp_Key_Cb)Function)
	Cast using Eina_Rbtree_Cmp_Key_Cb.
#define	EINA_RBTREE_FREE_CB(Function)   ((Eina_Rbtree_Free_Cb)Function)
	Cast using Eina_Rbtree_Free_Cb.

Typedefs
typedef struct _Eina_Rbtree	Eina_Rbtree
	Type for a Red-Black tree node. More...
typedef Eina_Rbtree_Direction(*	Eina_Rbtree_Cmp_Node_Cb) (const Eina_Rbtree *left, const Eina_Rbtree *right, void *data)
	Function used to compare two nodes and see which direction to navigate.
typedef int(*	Eina_Rbtree_Cmp_Key_Cb) (const Eina_Rbtree *node, const void *key, int length, void *data)
	Function used compare node with a given key of specified length.
typedef void(*	Eina_Rbtree_Free_Cb) (Eina_Rbtree *node, void *data)
	Function used to free a node.

Enumerations
enum	Eina_Rbtree_Color {   EINA_RBTREE_RED,   EINA_RBTREE_BLACK }
	node color.
enum	Eina_Rbtree_Direction {   EINA_RBTREE_LEFT = 0,   EINA_RBTREE_RIGHT = 1 }
	walk direction.

Functions
static Eina_Rbtree *	eina_rbtree_inline_lookup (const Eina_Rbtree *root, const void *key, int length, Eina_Rbtree_Cmp_Key_Cb cmp, const void *data)
Eina_Rbtree *	eina_rbtree_inline_insert (Eina_Rbtree *root, Eina_Rbtree *node, Eina_Rbtree_Cmp_Node_Cb cmp, const void *data)
	Inserts a new node inside an existing red black tree. More...
Eina_Rbtree *	eina_rbtree_inline_remove (Eina_Rbtree *root, Eina_Rbtree *node, Eina_Rbtree_Cmp_Node_Cb cmp, const void *data)
	Removes a node from an existing red black tree. More...
void	eina_rbtree_delete (Eina_Rbtree *root, Eina_Rbtree_Free_Cb func, void *data)
	Deletes all nodes from a valid red black tree. More...
Eina_Iterator *	eina_rbtree_iterator_prefix (const Eina_Rbtree *root)
	Returns a new prefix iterator associated with a rbtree. More...
Eina_Iterator *	eina_rbtree_iterator_infix (const Eina_Rbtree *root)
	Returns a new prefix iterator associated with a rbtree. More...
Eina_Iterator *	eina_rbtree_iterator_postfix (const Eina_Rbtree *root)
	Returns a new prefix iterator associated with a rbtree. More...

Detailed Description

These functions provide Red-Black tree management.

For a brief description look at http://en.wikipedia.org/wiki/Red-black_tree . This code is largely inspired from a tutorial written by Julienne Walker at : http://eternallyconfuzzled.com/tuts/datastructures/jsw_tut_rbtree.aspx . The main difference is that this set of functions never allocate any data, making them particularly useful for memory management.

Macro Definition Documentation

EINA_RBTREE

#define EINA_RBTREE   Eina_Rbtree __rbtree

recommended way to declare the inlined Eina_Rbtree in your type.

struct my_type {
   EINA_RBTREE;
   int my_value;
   char *my_name;
};

See also

EINA_RBTREE_GET()

Typedef Documentation

Eina_Rbtree

Eina_Rbtree

Type for a Red-Black tree node.

It should be inlined into user's type.

Function Documentation

eina_rbtree_inline_insert()

Eina_Rbtree* eina_rbtree_inline_insert	(	Eina_Rbtree *	root,
		Eina_Rbtree *	node,
		Eina_Rbtree_Cmp_Node_Cb	cmp,
		const void *	data
	)

Inserts a new node inside an existing red black tree.

Parameters

[in,out]	root	The root of an existing valid red black tree.
[in]	node	The new node to insert.
[in]	cmp	The callback that is able to compare two nodes.
[in]	data	Private data to help the compare function.

Returns

The new root of the red black tree.

This function inserts a new node in a valid red black tree. NULL is an empty valid red black tree. The resulting new tree is a valid red black tree. This function doesn't allocate any data.

References EINA_SAFETY_ON_NULL_RETURN_VAL.

Referenced by edje_box_layout_register().

eina_rbtree_inline_remove()

Eina_Rbtree* eina_rbtree_inline_remove	(	Eina_Rbtree *	root,
		Eina_Rbtree *	node,
		Eina_Rbtree_Cmp_Node_Cb	cmp,
		const void *	data
	)

Removes a node from an existing red black tree.

Parameters

[in,out]	root	The root of a valid red black tree.
[in]	node	The node to remove from the tree.
[in]	cmp	The callback that is able to compare two nodes.
[in]	data	Private data to help the compare function.

Returns

The new root of the red black tree.

This function removes a new node in a valid red black tree that should contain the node that you are removing. This function will return NULL when the red black tree got empty. This function doesn't free any data.

References EINA_SAFETY_ON_NULL_RETURN_VAL.

Referenced by edje_box_layout_register().

eina_rbtree_delete()

void eina_rbtree_delete	(	Eina_Rbtree *	root,
		Eina_Rbtree_Free_Cb	func,
		void *	data
	)

Deletes all nodes from a valid red black tree.

Parameters

[in,out]	root	The root of a valid red black tree.
[in]	func	The callback that will free each node.
[in]	data	Private data to help the compare function.

References eina_rbtree_delete(), and EINA_SAFETY_ON_NULL_RETURN.

Referenced by eina_hash_free(), eina_hash_free_buckets(), and eina_rbtree_delete().

eina_rbtree_iterator_prefix()

Eina_Iterator* eina_rbtree_iterator_prefix

(

const Eina_Rbtree *

root

)

Returns a new prefix iterator associated with a rbtree.

Parameters

[in]

root

The root of rbtree.

Returns

A new iterator.

This function returns a newly allocated iterator associated with root. It will iterate the tree using prefix walk. If root is NULL, this function still returns a valid iterator that will always return false on eina_iterator_next(), thus keeping API sane.

If the memory cannot be allocated, NULL is returned. Otherwise, a valid iterator is returned.

Warning

if the rbtree structure changes then the iterator becomes invalid! That is, if you add or remove nodes this iterator behavior is undefined and your program may crash!

eina_rbtree_iterator_infix()

Eina_Iterator* eina_rbtree_iterator_infix

(

const Eina_Rbtree *

root

)

Returns a new prefix iterator associated with a rbtree.

Parameters

[in]

root

The root of rbtree.

Returns

A new iterator.

This function returns a newly allocated iterator associated with root. It will iterate the tree using infix walk. If root is NULL, this function still returns a valid iterator that will always return false on eina_iterator_next(), thus keeping API sane.

If the memory cannot be allocated, NULL is returned. Otherwise, a valid iterator is returned.

Warning

if the rbtree structure changes then the iterator becomes invalid! That is, if you add or remove nodes this iterator behavior is undefined and your program may crash!

eina_rbtree_iterator_postfix()

Eina_Iterator* eina_rbtree_iterator_postfix

(

const Eina_Rbtree *

root

)

Returns a new prefix iterator associated with a rbtree.

Parameters

[in]

root

The root of rbtree.

Returns

A new iterator.

This function returns a newly allocated iterator associated with root. It will iterate the tree using postfix walk. If root is NULL, this function still returns a valid iterator that will always return false on eina_iterator_next(), thus keeping API sane.

If the memory cannot be allocated, NULL is returned. Otherwise, a valid iterator is returned.

Warning

if the rbtree structure changes then the iterator becomes invalid! That is, if you add or remove nodes this iterator behavior is undefined and your program may crash!