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/*-------------------------------------------------------------------------
*
* rbtree.h
* interface for PostgreSQL generic Red-Black binary tree package
*
* Copyright (c) 1996-2009, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/include/utils/rbtree.h,v 1.2 2010/02/26 02:01:29 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef RBTREE_H
#define RBTREE_H
typedef struct RBTree RBTree;
typedef struct RBTreeIterator RBTreeIterator;
typedef int (*rb_comparator) (const void *a, const void *b, void *arg);
typedef void *(*rb_appendator) (void *current, void *new, void *arg);
typedef void (*rb_freefunc) (void *a);
extern RBTree *rb_create(rb_comparator comparator,
rb_appendator appendator,
rb_freefunc freefunc,
void *arg);
extern void *rb_find(RBTree *rb, void *data);
extern void *rb_insert(RBTree *rb, void *data);
extern void rb_delete(RBTree *rb, void *data);
extern void *rb_leftmost(RBTree *rb);
typedef enum RBOrderControl
{
LeftRightWalk,
RightLeftWalk,
DirectWalk,
InvertedWalk
} RBOrderControl;
extern RBTreeIterator *rb_begin_iterate(RBTree *rb, RBOrderControl ctrl);
extern void *rb_iterate(RBTreeIterator *iterator);
extern void rb_free_iterator(RBTreeIterator *iterator);
#endif
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