/*
 * Copyright (C) 1997-2000  Internet Software Consortium.
 * 
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/* $Id: heap.h,v 1.13 2000/06/22 21:57:35 tale Exp $ */

#ifndef ISC_HEAP_H
#define ISC_HEAP_H 1

#include <isc/lang.h>
#include <isc/types.h>

ISC_LANG_BEGINDECLS

/* 
 * The comparision function returns ISC_TRUE if the first argument has
 * higher priority than the second argument, and ISC_FALSE otherwise.
 */
typedef isc_boolean_t (*isc_heapcompare_t)(void *, void *);

typedef void (*isc_heapindex_t)(void *, unsigned int);
typedef void (*isc_heapaction_t)(void *, void *);

typedef struct isc_heap isc_heap_t;

isc_result_t	isc_heap_create(isc_mem_t *, isc_heapcompare_t,
				isc_heapindex_t, unsigned int, isc_heap_t **);
void		isc_heap_destroy(isc_heap_t **);
isc_result_t	isc_heap_insert(isc_heap_t *, void *);
void		isc_heap_delete(isc_heap_t *, unsigned int);
void		isc_heap_increased(isc_heap_t *, unsigned int);
void		isc_heap_decreased(isc_heap_t *, unsigned int);
void *		isc_heap_element(isc_heap_t *, unsigned int);
void		isc_heap_foreach(isc_heap_t *, isc_heapaction_t, void *);

ISC_LANG_ENDDECLS

#endif /* ISC_HEAP_H */
