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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2004 Red Hat, Inc.
* Copyright © 2005 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Red Hat, Inc.
*
* Contributor(s):
* Keith Packard <keithp@keithp.com>
* Graydon Hoare <graydon@redhat.com>
* Carl Worth <cworth@cworth.org>
*/
#ifndef CAIRO_HASH_PRIVATE_H
#define CAIRO_HASH_PRIVATE_H
/* XXX: I'd like this file to be self-contained in terms of
* includeability, but that's not really possible with the current
* monolithic cairoint.h. So, for now, just include cairoint.h instead
* if you want to include this file. */
typedef struct _cairo_hash_table cairo_hash_table_t;
/**
* cairo_hash_entry_t:
*
* A #cairo_hash_entry_t contains both a key and a value for
* cairo_hash_table_t. User-derived types for cairo_hash_entry_t must
* be type-compatible with this structure (eg. they must have an
* unsigned long as the first parameter. The easiest way to get this
* is to use:
*
* typedef _my_entry {
* cairo_hash_entry_t base;
* ... Remainder of key and value fields here ..
* } my_entry_t;
*
* which then allows a pointer to my_entry_t to be passed to any of
* the cairo_hash_table functions as follows without requiring a cast:
*
* _cairo_hash_table_insert (hash_table, &my_entry->base);
*
* IMPORTANT: The caller is reponsible for initializing
* my_entry->base.hash with a hash code derived from the key. The
* essential property of the hash code is that keys_equal must never
* return TRUE for two keys that have different hashes. The best hash
* code will reduce the frequency of two keys with the same code for
* which keys_equal returns FALSE.
*
* Which parts of the entry make up the "key" and which part make up
* the value are entirely up to the caller, (as determined by the
* computation going into base.hash as well as the keys_equal
* function). A few of the cairo_hash_table functions accept an entry
* which will be used exclusively as a "key", (indicated by a
* parameter name of key). In these cases, the value-related fields of
* the entry need not be initialized if so desired.
**/
typedef struct _cairo_hash_entry {
unsigned long hash;
} cairo_hash_entry_t;
typedef cairo_bool_t
(*cairo_hash_keys_equal_func_t) (void *key_a, void *key_b);
typedef cairo_bool_t
(*cairo_hash_predicate_func_t) (void *entry);
typedef void
(*cairo_hash_callback_func_t) (void *entry,
void *closure);
cairo_private cairo_hash_table_t *
_cairo_hash_table_create (cairo_hash_keys_equal_func_t keys_equal);
cairo_private void
_cairo_hash_table_destroy (cairo_hash_table_t *hash_table);
cairo_private cairo_bool_t
_cairo_hash_table_lookup (cairo_hash_table_t *hash_table,
cairo_hash_entry_t *key,
cairo_hash_entry_t **entry_return);
cairo_private void *
_cairo_hash_table_random_entry (cairo_hash_table_t *hash_table,
cairo_hash_predicate_func_t predicate);
cairo_private cairo_status_t
_cairo_hash_table_insert (cairo_hash_table_t *hash_table,
cairo_hash_entry_t *entry);
cairo_private void
_cairo_hash_table_remove (cairo_hash_table_t *hash_table,
cairo_hash_entry_t *key);
cairo_private void
_cairo_hash_table_foreach (cairo_hash_table_t *hash_table,
cairo_hash_callback_func_t hash_callback,
void *closure);
#endif
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