126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
/* EINA - EFL data type library
|
|
* Copyright (C) 2008 Cedric Bail
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library;
|
|
* if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef EINA_ITERATOR_H__
|
|
#define EINA_ITERATOR_H__
|
|
|
|
#include "eina_config.h"
|
|
|
|
#include "eina_types.h"
|
|
#include "eina_magic.h"
|
|
|
|
/**
|
|
* @addtogroup Eina_Content_Access_Group Content Access
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @defgroup Eina_Iterator_Group Iterator Functions
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @typedef Eina_Iterator
|
|
* Type for iterators.
|
|
*/
|
|
typedef struct _Eina_Iterator Eina_Iterator;
|
|
|
|
typedef Eina_Bool (*Eina_Iterator_Next_Callback)(Eina_Iterator *it, void **data);
|
|
typedef void *(*Eina_Iterator_Get_Container_Callback)(Eina_Iterator *it);
|
|
typedef void (*Eina_Iterator_Free_Callback)(Eina_Iterator *it);
|
|
|
|
struct _Eina_Iterator
|
|
{
|
|
Eina_Iterator_Next_Callback next EINA_ARG_NONNULL(1, 2) EINA_WARN_UNUSED_RESULT;
|
|
Eina_Iterator_Get_Container_Callback get_container EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;
|
|
Eina_Iterator_Free_Callback free EINA_ARG_NONNULL(1);
|
|
|
|
#define EINA_MAGIC_ITERATOR 0x98761233
|
|
EINA_MAGIC
|
|
};
|
|
|
|
|
|
#define FUNC_ITERATOR_NEXT(Function) ((Eina_Iterator_Next_Callback)Function)
|
|
#define FUNC_ITERATOR_GET_CONTAINER(Function) ((Eina_Iterator_Get_Container_Callback)Function)
|
|
#define FUNC_ITERATOR_FREE(Function) ((Eina_Iterator_Free_Callback)Function)
|
|
|
|
EAPI void eina_iterator_free (Eina_Iterator *iterator) EINA_ARG_NONNULL(1);
|
|
|
|
EAPI void *eina_iterator_container_get (Eina_Iterator *iterator) EINA_ARG_NONNULL(1) EINA_PURE;
|
|
EAPI Eina_Bool eina_iterator_next (Eina_Iterator *iterator, void **data) EINA_ARG_NONNULL(1, 2) EINA_WARN_UNUSED_RESULT;
|
|
|
|
EAPI void eina_iterator_foreach (Eina_Iterator *iterator,
|
|
Eina_Each callback,
|
|
const void *fdata) EINA_ARG_NONNULL(1, 2);
|
|
|
|
/**
|
|
* @def EINA_ITERATOR_FOREACH
|
|
* @brief Macro to iterate over all elements easily.
|
|
*
|
|
* @param itr The iterator to use.
|
|
* @param data Where to store * data, must be a pointer support getting
|
|
* its address since * eina_iterator_next() requires a pointer
|
|
* to pointer!
|
|
*
|
|
* This macro is a convenient way to use iterators, very similar to
|
|
* EINA_LIST_FOREACH().
|
|
*
|
|
* This macro can be used for freeing the data of a list, like in the
|
|
* following example. It has the same goal as the one documented in
|
|
* EINA_LIST_FOREACH(), but using iterators:
|
|
*
|
|
* @code
|
|
* Eina_List *list;
|
|
* Eina_Iterator *itr;
|
|
* char *data;
|
|
*
|
|
* // list is already filled,
|
|
* // its elements are just duplicated strings
|
|
*
|
|
* itr = eina_list_iterator_new(list);
|
|
* EINA_ITERATOR_FOREACH(itr, data)
|
|
* free(data);
|
|
* eina_iterator_free(itr);
|
|
* eina_list_free(list);
|
|
* @endcode
|
|
*
|
|
* @note this example is not optimal algorithm to release a list since
|
|
* it will walk the list twice, but it serves as an example. For
|
|
* optimized version use EINA_LIST_FREE()
|
|
*
|
|
* @warning unless explicitly stated in functions returning iterators,
|
|
* do not modify the iterated object while you walk it, in this
|
|
* example using lists, do not remove list nodes or you might
|
|
* crash! This is not a limitiation of iterators themselves,
|
|
* rather in the iterators implementations to keep them as simple
|
|
* and fast as possible.
|
|
*/
|
|
#define EINA_ITERATOR_FOREACH(itr, data) while (eina_iterator_next((itr), (void **)&(data)))
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif
|