/*
 * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

/**
 * @file
 * @date    16.03.2007
 * @brief   a set of pointers with a custom compare function
 * @author  Matthias Braun
 * @version $Id: cpset.h 17143 2008-01-02 20:56:33Z beck $
 */
#ifndef FIRM_ADT_CPSET_H
#define FIRM_ADT_CPSET_H

/**
 * The type of a cpset compare function.
 *
 * @param p1   pointer to an element
 * @param p2   pointer to another element
 *
 * @return  1 if the elements are identically, zero else
 */
typedef int (*cpset_cmp_function) (const void *p1, const void *p2);

/**
 * The type of a cpset hash function.
 */
typedef unsigned (*cpset_hash_function) (const void *obj);

#define HashSet          cpset_t
#define HashSetIterator  cpset_iterator_t
#define HashSetEntry     cpset_hashset_entry_t
#define ValueType        void*
#define ADDITIONAL_DATA  cpset_cmp_function cmp_function; cpset_hash_function hash_function;
#include "hashset.h"
#undef ADDITIONAL_DATA
#undef ValueType
#undef HashSetEntry
#undef HashSetIterator
#undef HashSet

typedef struct cpset_t          cpset_t;
typedef struct cpset_iterator_t cpset_iterator_t;

/**
 * Initializes a cpset
 *
 * @param cpset        Pointer to allocated space for the cpset
 * @param cmp_function The compare function to use
 */
void cpset_init(cpset_t *cpset, cpset_hash_function hash_function,
                cpset_cmp_function cmp_function);

/**
 * Initializes a cpset
 *
 * @param cpset               Pointer to allocated space for the cpset
 * @param cmp_function        The compare function to use
 * @param expected_elements   Number of elements expected in the cpset (roughly)
 */
void cpset_init_size(cpset_t *cpset, cpset_hash_function hash_function,
                     cpset_cmp_function cmp_function,
                     size_t expected_elements);

/**
 * Destroys a cpset and frees the memory allocated for hashtable. The memory of
 * the cpset itself is not freed.
 *
 * @param cpset   Pointer to the cpset
 */
void cpset_destroy(cpset_t *cpset);

/**
 * Inserts an element into a cpset.
 *
 * @param cpset   Pointer to the cpset
 * @param obj     Element to insert into the cpset
 * @returns       The element itself or a pointer to an existing element
 */
void* cpset_insert(cpset_t *cpset, void *obj);

/**
 * Removes an element from a cpset. Does nothing if the cpset doesn't contain the
 * element.
 *
 * @param cpset   Pointer to the cpset
 * @param obj     Pointer to remove from the cpset
 */
void cpset_remove(cpset_t *cpset, const void *obj);

/**
 * Tests whether a cpset contains a pointer
 *
 * @param cpset   Pointer to the cpset
 * @param obj     The pointer to find
 * @returns       An equivalent object to @p obj or NULL
 */
void *cpset_find(const cpset_t *cpset, const void *obj);

/**
 * Returns the number of pointers contained in the cpset
 *
 * @param cpset   Pointer to the cpset
 * @returns       Number of pointers contained in the cpset
 */
size_t cpset_size(const cpset_t *cpset);

/**
 * Initializes a cpset iterator. Sets the iterator before the first element in
 * the cpset.
 *
 * @param iterator   Pointer to already allocated iterator memory
 * @param cpset       Pointer to the cpset
 */
void cpset_iterator_init(cpset_iterator_t *iterator, const cpset_t *cpset);

/**
 * Advances the iterator and returns the current element or NULL if all elements
 * in the cpset have been processed.
 * @attention It is not allowed to use cpset_insert or cpset_remove while
 *            iterating over a cpset.
 *
 * @param iterator  Pointer to the cpset iterator.
 * @returns         Next element in the cpset or NULL
 */
void *cpset_iterator_next(cpset_iterator_t *iterator);

/**
 * Removed the element the iterator currently points to
 *
 * @param cpset     Pointer to the cpset
 * @param iterator  Pointer to the cpset iterator.
 */
void cpset_remove_iterator(cpset_t *cpset, const cpset_iterator_t *iterator);

#endif /* FIRM_ADT_CPSET_H */
