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binary_heap.h

/*-
 * Copyright (c) 2006 Verdens Gang AS
 * Copyright (c) 2006 Linpro AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: binary_heap.h 1096 2006-09-20 07:50:27Z des $
 *
 * Binary Heap API (see: http://en.wikipedia.org/wiki/Binary_heap)
 *
 * XXX: doesn't scale back the array of pointers when items are deleted.
 */

/* Public Interface --------------------------------------------------*/

struct binheap;

typedef int binheap_cmp_t(void *priv, void *a, void *b);
      /*
       * Comparison function.
       * Should return true if item 'a' should be closer to the root
       * than item 'b'
       */

typedef void binheap_update_t(void *priv, void *a, unsigned newidx);
      /*
       * Update function (optional)
       * When items move in the tree, this function gets called to
       * notify the item of its new index.
       * Only needed if deleting non-root items.
       */

struct binheap *binheap_new(void *priv, binheap_cmp_t, binheap_update_t);
      /*
       * Create Binary tree
       * 'priv' is passed to cmp and update functions.
       */

void binheap_insert(struct binheap *, void *);
      /*
       * Insert an item
       */

void binheap_delete(struct binheap *, unsigned idx);
      /*
       * Delete an item
       * The root item has 'idx' zero
       */

void *binheap_root(struct binheap *);
      /*
       * Return the root item
       */


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