123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/**
|
|
* @file iterator.h
|
|
*
|
|
* @brief Interface iterator_t.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2005 Jan Hutter, Martin Willi
|
|
* Hochschule fuer Technik Rapperswil
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*/
|
|
|
|
#ifndef ITERATOR_H_
|
|
#define ITERATOR_H_
|
|
|
|
typedef struct iterator_t iterator_t;
|
|
|
|
/**
|
|
* @brief Iterator interface, allows iteration over collections.
|
|
*
|
|
* iterator_t defines an interface for iterating over collections.
|
|
* It allows searching, deleting, updating and inserting.
|
|
*
|
|
* @ingroup utils
|
|
*/
|
|
struct iterator_t {
|
|
|
|
/**
|
|
* Moves to the next element, if available.
|
|
*
|
|
* @param this calling object
|
|
* @return
|
|
* - TRUE, if more elements are avaiable,
|
|
* - FALSE otherwise
|
|
*/
|
|
bool (*has_next) (iterator_t *this);
|
|
|
|
/**
|
|
* Returns the current value at the iterator position.
|
|
*
|
|
* @param this calling object
|
|
* @param [out]value value is set to the current value at iterator position
|
|
* @return
|
|
* - SUCCESS
|
|
* - FAILED if list is empty
|
|
*/
|
|
status_t (*current) (iterator_t *this, void **value);
|
|
|
|
/**
|
|
* Inserts a new item before the given iterator position.
|
|
*
|
|
* The iterator position is not changed after inserting
|
|
*
|
|
* @param this calling iterator
|
|
* @param [in]item value to insert in list
|
|
* @return
|
|
* - SUCCESS
|
|
* - FAILED
|
|
*/
|
|
status_t (*insert_before) (iterator_t *this, void *item);
|
|
|
|
/**
|
|
* Inserts a new item after the given iterator position.
|
|
*
|
|
* The iterator position is not changed after inserting.
|
|
*
|
|
* @param this calling iterator
|
|
* @param [in]item value to insert in list
|
|
* @return
|
|
* - SUCCESS
|
|
* - FAILED
|
|
*/
|
|
status_t (*insert_after) (iterator_t *this, void *item);
|
|
|
|
/**
|
|
* @brief removes an element from list at the given iterator position.
|
|
*
|
|
* The position of the iterator is set in the following order:
|
|
* - to the item before, if available
|
|
* - otherwise to the item after, if available
|
|
* - otherwise it gets reseted
|
|
*
|
|
* @param linked_list calling object
|
|
* @return
|
|
* - SUCCESS
|
|
* - FAILED
|
|
*/
|
|
status_t (*remove) (iterator_t *iterator);
|
|
|
|
/**
|
|
* @brief Resets the iterator position.
|
|
*
|
|
* After reset, the iterator stands NOT on an element.
|
|
* A call to has_next is necessary to do any other operations
|
|
* with the resetted iterator.
|
|
*
|
|
* @param this calling object
|
|
* @return SUCCESS in any case
|
|
*/
|
|
status_t (*reset) (iterator_t *this);
|
|
|
|
/**
|
|
* @brief Destroys an iterator.
|
|
*
|
|
* @param this iterator to destroy
|
|
* @return SUCCESS in any case
|
|
*
|
|
*/
|
|
status_t (*destroy) (iterator_t *this);
|
|
};
|
|
|
|
#endif /*ITERATOR_H_*/
|