hash-table.h

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/*
 
Copyright (c) 2005-2008, Simon Howard
 
Permission to use, copy, modify, and/or 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 THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR 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.
 
 */
 
#ifndef ALGORITHM_HASH_TABLE_H
#define ALGORITHM_HASH_TABLE_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct _HashTable HashTable;
 
typedef struct _HashTableIterator HashTableIterator;
 
typedef struct _HashTableEntry HashTableEntry;
 
typedef void *HashTableKey;
 
typedef void *HashTableValue;
 
typedef struct _HashTablePair{
    HashTableKey key;
    HashTableValue value;
} HashTablePair;
 
struct _HashTableIterator {
    HashTable *hash_table;
    HashTableEntry *next_entry;
    unsigned int next_chain;
};
 
#define HASH_TABLE_NULL ((void *) 0)
 
typedef unsigned int (*HashTableHashFunc)(HashTableKey value);
 
typedef int (*HashTableEqualFunc)(HashTableKey value1, HashTableKey value2);
 
typedef void (*HashTableKeyFreeFunc)(HashTableKey value);
 
typedef void (*HashTableValueFreeFunc)(HashTableValue value);
 
HashTable *hash_table_new(HashTableHashFunc hash_func,
                          HashTableEqualFunc equal_func);
 
void hash_table_free(HashTable *hash_table);
 
void hash_table_register_free_functions(HashTable *hash_table,
                                        HashTableKeyFreeFunc key_free_func,
                                        HashTableValueFreeFunc value_free_func);
 
int hash_table_insert(HashTable *hash_table,
                      HashTableKey key,
                      HashTableValue value);
 
HashTableValue hash_table_lookup(HashTable *hash_table,
                                 HashTableKey key);
 
int hash_table_remove(HashTable *hash_table, HashTableKey key);
 
unsigned int hash_table_num_entries(HashTable *hash_table);
 
void hash_table_iterate(HashTable *hash_table, HashTableIterator *iter);
 
int hash_table_iter_has_more(HashTableIterator *iterator);
 
HashTablePair hash_table_iter_next(HashTableIterator *iterator);
 
#ifdef __cplusplus
}
#endif
 
#endif /* #ifndef ALGORITHM_HASH_TABLE_H */