| QBMAP.H(3) | libqb Programmer's Manual | QBMAP.H(3) |
qbmap.h - This provides a map interface to a Patricia trie, hashtable or skiplist.
#include <qb/qbmap.h>
Ordering
The hashtable is NOT ordered, but ptrie and skiplist are.
Iterating
Below is a simple example of how to iterate over a map.
const char *p;
void *data;
qb_map_iter_t *it = qb_map_iter_create(m);
for (p = qb_map_iter_next(it, &data); p; p = qb_map_iter_next(it, &data)) {
printf("%s > %s0, p, (char*) data);
}
qb_map_iter_free(it);
Deletion of items within the iterator is supported. But note do not free the item memory in the iterator. If you need to free the data items then register for a notifier and free the memory there. This is required as the items are reference counted.
qb_map_notify_add(m, NULL, my_map_free_handler,
QB_MAP_NOTIFY_FREE, NULL);
Notifications
These allow you to get callbacks when values are inserted/removed or replaced.
Prefix matching
The ptrie supports prefixes in the iterator:
it = qb_map_pref_iter_create(m, "aa");
while ((p = qb_map_iter_next(it, &data)) != NULL) {
printf("%s > %s0, p, (char*)data);
}
qb_map_iter_free(it);
The ptrie also supports prefixes in notifications: (remember to pass QB_MAP_NOTIFY_RECURSIVE into the notify_add.
qb_map_notify_add(m, "root", my_map_notification,
(QB_MAP_NOTIFY_INSERTED|
QB_MAP_NOTIFY_DELETED|
QB_MAP_NOTIFY_REPLACED|
QB_MAP_NOTIFY_RECURSIVE),
NULL);
hashtable only supports deletion and replacement notificatins. There is also a special global callback for freeing deleted and replaced values (QB_MAP_NOTIFY_FREE).
qb_trie_dump(3), qb_map_iter_create(3), qb_skiplist_create(3), qb_map_notify_del(3), qb_map_put(3), qb_map_count_get(3), qb_map_foreach(3), qb_map_pref_iter_create(3), qb_map_iter_next(3), qb_map_get(3), qb_map_destroy(3), qb_hashtable_create(3), qb_map_iter_free(3), qb_map_notify_add(3), qb_trie_create(3), qb_map_notify_del_2(3), qb_map_rm(3)
Copyright (C) 2010-2020 Red Hat, Inc.
| 2021-03-03 | LIBQB |