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Filename : rbtree.h
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/*
  +----------------------------------------------------------------------+
  | Swoole                                                               |
  +----------------------------------------------------------------------+
  | This source file is subject to version 2.0 of the Apache license,    |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.apache.org/licenses/LICENSE-2.0.html                      |
  | If you did not receive a copy of the Apache2.0 license and are unable|
  | to obtain it through the world-wide-web, please send a note to       |
  | license@swoole.com so we can mail you a copy immediately.            |
  +----------------------------------------------------------------------+
  | Author: Tianfeng Han  <mikan.tenny@gmail.com>                        |
  +----------------------------------------------------------------------+
*/

#ifndef _SW_RBTREE_H_INCLUDED_
#define _SW_RBTREE_H_INCLUDED_

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

typedef struct swRbtree_node_s swRbtree_node;

struct swRbtree_node_s
{
    uint32_t key;
    void *value;
    swRbtree_node *left;
    swRbtree_node *right;
    swRbtree_node *parent;
    char color;
};

typedef struct swRbtree_s swRbtree;

struct swRbtree_s
{
    swRbtree_node *root;
    swRbtree_node *sentinel;
};

swRbtree* swRbtree_new();
void swRbtree_free(swRbtree*);
void swRbtree_insert(swRbtree *tree, uint32_t key, void *value);
int swRbtree_delete(swRbtree *tree, uint32_t key);
void* swRbtree_find(swRbtree *tree, uint32_t key);

#define swRbtree_red(node)               ((node)->color = 1)
#define swRbtree_black(node)             ((node)->color = 0)
#define swRbtree_is_red(node)            ((node)->color)
#define swRbtree_is_black(node)          (!swRbtree_is_red(node))
#define swRbtree_copy_color(n1, n2)      (n1->color = n2->color)

#define swRbtree_sentinel_init(node)      swRbtree_black(node)

static inline swRbtree_node *swRbtree_min(swRbtree_node *node, swRbtree_node *sentinel)
{
    while (node->left != sentinel)
    {
        node = node->left;
    }
    return node;
}

#ifdef __cplusplus
}
#endif

#endif