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/* -*- c -*- */
/*
* avl.h
*
* chpp
*
* Copyright (C) 1994-1998 Mark Probst
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __AVL_H__
#define __AVL_H__
typedef struct _avlNode
{
void *key;
int balance;
unsigned int rank;
struct _avlNode *up;
struct _avlNode *left;
struct _avlNode *right;
} avlNode;
typedef struct
{
avlNode *head;
unsigned int numElements;
int isSorted;
int (*compare) (void*, void*);
} avlTree;
#define AVL_LINK(a,N) (((a) == -1) ? (N)->left : (N)->right)
#define AVL_LINK_SET(s,P,V) ((((s) == -1) ? (P)->left : (P)->right) = (V))
int avlCompare (avlTree*, void*, unsigned int, avlNode*);
int avlBalance (avlNode*, int, avlNode**);
avlTree* avlNew (void);
avlTree* avlNewSorted (int (*) (void*, void*));
void avlInsert (avlTree*, void*, unsigned int);
void avlPut (avlTree*, void*);
avlNode* avlFirst (avlTree*, unsigned int);
avlNode* avlSearch (avlTree*, void*);
unsigned int avlGetPos (avlTree*, void*);
avlNode* avlNext (avlNode*);
avlNode* avlPrevious (avlNode*);
void avlDeleteNode (avlTree*, avlNode*, int);
void* avlDelete (avlTree*, unsigned int);
void* avlKey (avlNode*);
void* avlGet (avlTree*, unsigned int);
unsigned int avlNumElements (avlTree*);
int avlIsEmpty (avlTree*);
int avlBalanced (avlNode*, unsigned int*, unsigned int*);
#endif
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