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/* Copyright (C) 2015-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
/**
* @file set.h
* @brief A set abstraction implemented on top of map.
*
* @note The API is based on map.h, see it for more examples.
*
* # Example usage:
*
* @code{.c}
* set_t set = set_make(NULL);
*
* // Insert keys
* if (set_add(&set, "princess") != 0 ||
* set_add(&set, "prince") != 0 ||
* set_add(&set, "leia") != 0) {
* fail();
* }
*
* // Test membership
* if (set_contains(&set, "leia")) {
* success();
* }
*
* // Prefix search
* int i = 0;
* int count(const char *s, void *n) { (*(int *)n)++; return 0; }
* if (set_walk_prefixed(set, "princ", count, &i) == 0) {
* printf("%d matches\n", i);
* }
*
* // Delete
* if (set_del(&set, "badkey") != 0) {
* fail(); // No such key
* }
*
* // Clear the set
* set_clear(&set);
* @endcode
*
* \addtogroup generics
* @{
*/
#pragma once
#include <stddef.h>
#include "map.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef map_t set_t;
typedef int (set_walk_cb)(const char *, void *);
/*! Creates an new, empty critbit set */
#define set_make \
map_make
/*! Returns non-zero if set contains str */
#define set_contains(set, str) \
map_contains((set), (str))
/*! Inserts str into set. Returns 0 if new, 1 if already present, or ENOMEM. */
#define set_add(set, str) \
map_set((set), (str), (void *)1)
/*! Deletes str from the set, returns 0 on suceess */
#define set_del(set, str) \
map_del((set), (str))
/*! Clears the given set */
#define set_clear(set) \
map_clear(set)
/*! Calls callback for all strings in map */
#define set_walk(set, callback, baton) \
map_walk_prefixed((set), "", (callback), (baton))
/*! Calls callback for all strings in set with the given prefix */
#define set_walk_prefixed(set, prefix, callback, baton) \
map_walk_prefixed((set), (prefix), (callback), (baton))
#ifdef __cplusplus
}
#endif
/** @} */
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