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/**
* A general unordered 2-int pair hash table ADT
*
* $Id$
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: none of this file.
*
* Contributor(s): Daniel Dunbar
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef BLI_EDGEHASH_H
#define BLI_EDGEHASH_H
struct EdgeHash;
struct EdgeHashIterator;
typedef struct EdgeHash EdgeHash;
typedef struct EdgeHashIterator EdgeHashIterator;
typedef void (*EdgeHashFreeFP)(void *key);
EdgeHash* BLI_edgehash_new (void);
void BLI_edgehash_free (EdgeHash *eh, EdgeHashFreeFP valfreefp);
/* Insert edge (v0,v1) into hash with given value, does
* not check for duplicates.
*/
void BLI_edgehash_insert (EdgeHash *eh, int v0, int v1, void *val);
/* Return value for given edge (v0,v1), or NULL if
* if key does not exist in hash. (If need exists
* to differentiate between key-value being NULL and
* lack of key then see BLI_edgehash_lookup_p().
*/
void* BLI_edgehash_lookup (EdgeHash *eh, int v0, int v1);
/* Return pointer to value for given edge (v0,v1),
* or NULL if key does not exist in hash.
*/
void** BLI_edgehash_lookup_p (EdgeHash *eh, int v0, int v1);
/* Return boolean true/false if edge (v0,v1) in hash. */
int BLI_edgehash_haskey (EdgeHash *eh, int v0, int v1);
/* Return number of keys in hash. */
int BLI_edgehash_size (EdgeHash *eh);
/* Remove all edges from hash. */
void BLI_edgehash_clear (EdgeHash *eh, EdgeHashFreeFP valfreefp);
/***/
/**
* Create a new EdgeHashIterator. The hash table must not be mutated
* while the iterator is in use, and the iterator will step exactly
* BLI_edgehash_size(gh) times before becoming done.
*/
EdgeHashIterator* BLI_edgehashIterator_new (EdgeHash *eh);
/* Free an EdgeHashIterator. */
void BLI_edgehashIterator_free (EdgeHashIterator *ehi);
/* Retrieve the key from an iterator. */
void BLI_edgehashIterator_getKey (EdgeHashIterator *ehi, int *v0_r, int *v1_r);
/* Retrieve the value from an iterator. */
void* BLI_edgehashIterator_getValue (EdgeHashIterator *ehi);
/* Set the value for an iterator. */
void BLI_edgehashIterator_setValue (EdgeHashIterator *ehi, void *val);
/* Steps the iterator to the next index. */
void BLI_edgehashIterator_step (EdgeHashIterator *ehi);
/* Determine if an iterator is done. */
int BLI_edgehashIterator_isDone (EdgeHashIterator *ehi);
#endif
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