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efl/src/lib/eina/eina_list.h

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/* EINA - EFL data type library
* Copyright (C) 2002-2008 Carsten Haitzler, Vincent Torri, Jorge Luis Zapata Muga
*
* 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_LIST_H_
#define EINA_LIST_H_
#include <stdlib.h>
#include "eina_config.h"
#include "eina_types.h"
#include "eina_iterator.h"
#include "eina_accessor.h"
#include "eina_magic.h"
/**
* @page eina_list_01_example_page Adding elements to Eina_List
* @dontinclude eina_list_01.c
*
* Creating an @ref Eina_List and adding elements to it is very easy and can be
* understood from an example:
* First thing is always to include Eina.h, for this example we also
* include stdio.h so we can use printf.
* @skip #include
* @until Eina.h
*
* Just some boilerplate code, declaring some variable and initializing eina.
* @until eina_init
* Here we add a sequence of elements to our list. By using append we add
* elements to the end of the list, so the list will look like this:@n
* @htmlonly
* <img src="eina_list_example_01_a.png" style="max-width: 100%;" />
* <a href="eina_list_example_01_a.png">Full-size</a>
* @endhtmlonly
* @image rtf eina_list_example_01_a.png
* @image latex eina_list_example_01_a.eps width=\textwidth
* @until roslin
* There are a couple of interesting things happening here, first is that we are
* passing a NULL pointer to the first @ref eina_list_append() call, when this
* is done a list is created. The other @b very important detail to notice is
* that the return value is attributed to the @a list variable, this needs to
* be done every time we use a a function that alters the contents of the list.
*
* Now that we have a list with some elements in it we can look at it's contents.
* @until printf
*
* There are many ways of accessing elements in the list, including by it's
* index:
* @until nth
* @note It should be noted that the index starts at 0.
*
* @ref eina_list_append() is not the only way to add elements to a a list. A
* common requirement is to add an element in a specific position this can be
* accomplished using @ref eina_list_append_relative() and
* @ref eina_list_append_relative_list():
* @until zarek
* First @a "cain" is added after the second element(remember that indexes are
* 0 based) and then we add @a "zarek" after @a "cain".
*
* @ref Eina_List also has prepend analogs to append functions we have used so
* far:
* @until lampkin
* With this additions our list now looks like this:@n
* @htmlonly
* <img src="eina_list_example_01_b.png" style="max-width: 100%;" />
* <a href="eina_list_example_01_b.png">Full-size</a>
* @endhtmlonly
* @image rtf eina_list_example_01_b.png
* @image latex eina_list_example_01_b.eps width=\textwidth
*
* Once done using the list it needs to be freed, and since we are done with
* eina that also need to be shutdown:
* @until }
*
* The full source code can be found on the examples folder
* on the @ref eina_list_01_c "eina_list_01.c" file.
*/
/**
* @page eina_list_01_c Adding elements to Eina_List example
*
* @include eina_list_01.c
* @example eina_list_01.c
*/
/**
* @page eina_list_02_example_page Sorting Eina_List elements
* @dontinclude eina_list_02.c
*
* If you don't know how to create lists see
* @ref eina_list_01_example_page.
*
* @skip #include
* @until boomer
* This is the code we have already seen to create a list. Now if we need to
* search the list we can do it like this:
* @until return
*
* However if searching the list multiple times it probably is better to sort
* the list since the sorted_search functions are much faster:
* @until return
*
* Once the list is sorted it's not a good idea to use append/prepend functions
* since that would add the element in the wrong place, instead elements should
* be added with @ref eina_list_sorted_insert():
* @until sorted_insert
*
* A noteworthy use case is adding an element to a list only if it doesn't exist
* already, this can accomplished by searching for the element that is closest
* to what is being added, and if that doesn't match add:
* @until append
* @note @ref eina_list_search_sorted_near_list() will tell you not only the
* nearest node to what was searched for but how it compares to your term, this
* way it is easy to know if you have to add before or after that node.
*
* It is sometimes useful to get a portion of the list as another list, here we
* take every element that comes after "boomer" and split it into "other_list":
* @until split_list
*
* It is also possible to add entire lists of elements using
* @ref eina_list_sorted_merge():
* @until sorted_merge
*
* And as always release memory and shutdown eina before ending:
* @until }
*
* The full source code can be found on the examples folder
* on the @ref eina_list_02_c "eina_list_02.c" file.
*/
/**
* @page eina_list_02_c Sorting Eina_List elements example
*
* @include eina_list_02.c
* @example eina_list_02.c
*/
/**
* @page eina_list_03_example_page Reordering Eina_List elements
* @dontinclude eina_list_03.c
*
* If you don't know how to create lists see
* @ref eina_list_01_example_page.
*
* We start out with code that should be familiar by now:
* @skip #include
* @until gemenon
*
* You can move elements around in a list using @ref eina_list_move() or using
* @ref eina_list_promote_list() and @ref eina_list_demote_list() which move a
* list node to the head and end of the list respectevely:
* @until demote
*
* Removing elements from a list can be done with ease:
* @until sagitarius
*
* To replace an element in the list it is not necessary to remove it and then
* add with the new value, it is possible to just change the value of a node:
* @until aquarius
*
* We will now take a peek to see if the list still has the right number of
* elements:
* @until printf
*
* Now that the list is in alphabetical order let's create a copy of it in
* reverse order and print every element to see if worked as expected:
* @until iterator_free
* @note Always remember to free your iterators when done using them.
*
* And as always release memory and shutdown eina before ending:
* @until }
*
* The full source code can be found on the examples folder
* on the @ref eina_list_03_c "eina_list_03.c" file.
*/
/**
* @page eina_list_03_c Reordering Eina_List elements example
*
* @include eina_list_03.c
* @example eina_list_03.c
*/
/**
* @page eina_list_04_example_page Eina_List and memory allocation
* @dontinclude eina_list_04.c
*
* If you don't know how to create lists see
* @ref eina_list_01_example_page. In this example we also use
* @ref Eina_Stringshare_Group, however it should be possible to understand the code
* regardless of previous knowledge about it.
*
* Here we have the usual list creation code with a twist, now we are using as
* data for the list memory that has to be freed later on.
* @skip #include
* @until Sharon
*
* This time we are going to iterate over our list in a different way:
* @until printf
*
* And now we are going to iterate over the list backwards:
* @until printf
*
* And now we need to free up the memory allocated during creation of the list:
* @until stringshare_del
* @note We don't need to use eina_list_free() since @ref EINA_LIST_FREE takes
* care of that.
*
* And shut everything down:
* @until }
*
* The full source code can be found on the examples folder
* on the @ref eina_list_04_c "eina_list_04.c" file.
*/
/**
* @page eina_list_04_c Eina_List and memory allocation example
*
* @include eina_list_04.c
* @example eina_list_04.c
*/
/**
* @addtogroup Eina_List_Group List
*
* @brief These functions provide double linked list management.
*
* Eina_List is a doubly linked list. It can store data of any type in the
* form of void pointers. It has convenience functions to do all the common
* operations which means it should rarely if ever be necessary to directly
* access the struct's fields. Nevertheless it can be useful to understand the
* inner workings of the data structure being used.
*
* @ref Eina_List nodes keep references to the previous node, the next node, its
* data and to an accounting structure.
*
* @htmlonly
* <img src="eina_list.png" style="max-width: 100%;" />
* <a href="eina_list.png">Full-size</a>
* @endhtmlonly
* @image rtf eina_list.png
* @image latex eina_list.eps width=5cm
*
* @ref Eina_List_Accounting is used to improve the performance of some
* functions. It is private and <b>should not</b> be modified. It contains a
* reference to the end of the list and the number of elements in the list.
*
* @note Every function that modifies the contents of the list returns a pointer
* to the head of the list and it is essential that this be pointer be used in
* any future references to the list.
*
* Most functions have two versions that have the same effect but operate on
* different arguments, the @a plain functions operate over data(eg.:
* @ref eina_list_append_relative, @ref eina_list_remove,
* @ref eina_list_data_find), the @a list versions of these functions operate
* on @ref Eina_List nodes.
*
* @warning You must @b always use the pointer to the first element of the list
* as the list!
* @warning You must @b never use a pointer to an element in the middle of the
* list as the list!
*
* Here are some examples of @ref Eina_List usage:
* @li @ref eina_list_01_example_page
* @li @ref eina_list_02_example_page
* @li @ref eina_list_03_example_page
* @li @ref eina_list_04_example_page
*/
/**
* @addtogroup Eina_Data_Types_Group Data Types
*
* @{
*/
/**
* @addtogroup Eina_Containers_Group Containers
*
* @{
*/
/**
* @defgroup Eina_List_Group List
*
* @{
*/
/**
* @typedef Eina_List
* Type for a generic double linked list.
*/
typedef struct _Eina_List Eina_List;
/**
* @typedef Eina_List_Accounting
* Cache used to store the last element of a list and the number of
* elements, for fast access.
*/
typedef struct _Eina_List_Accounting Eina_List_Accounting;
/**
* @struct _Eina_List
* Type for a generic double linked list.
*/
struct _Eina_List
{
void *data; /**< Pointer to list element payload */
Eina_List *next; /**< Next member in the list */
Eina_List *prev; /**< Previous member in the list */
Eina_List_Accounting *accounting; /**< Private list accounting info - don't touch */
EINA_MAGIC
};
/**
* @struct _Eina_List_Accounting
* Cache used to store the last element of a list and the number of
* elements, for fast access. It is for private used and must not be
* touched.
*/
struct _Eina_List_Accounting
{
Eina_List *last; /**< Pointer to the last element of the list - don't touch */
unsigned int count; /**< Number of elements of the list - don't touch */
EINA_MAGIC
};
/**
* @brief Append the given data to the given linked list.
*
* @param list The given list.
* @param data The data to append.
* @return A list pointer.
*
* This function appends @p data to @p list. If @p list is @c NULL, a
* new list is returned. On success, a new list pointer that should be
* used in place of the one given to this function is
* returned. Otherwise, the old pointer is returned.
*
* The following example code demonstrates how to ensure that the
* given data has been successfully appended.
*
* @code
* Eina_List *list = NULL;
* extern void *my_data;
*
* list = eina_list_append(list, my_data);
* if (eina_error_get())
* {
* fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
* exit(-1);
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list(or NULL).
*/
EAPI Eina_List *eina_list_append(Eina_List *list, const void *data) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Prepends the given data to the given linked list.
*
* @param list The given list.
* @param data The data to prepend.
* @return A list pointer.
*
* This function prepends @p data to @p list. If @p list is @c NULL, a
* new list is returned. On success, a new list pointer that should be
* used in place of the one given to this function is
* returned. Otherwise, the old pointer is returned.
*
* The following example code demonstrates how to ensure that the
* given data has been successfully prepended.
*
* Example:
* @code
* Eina_List *list = NULL;
* extern void *my_data;
*
* list = eina_list_prepend(list, my_data);
* if (eina_error_get())
* {
* fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
* exit(-1);
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_prepend(Eina_List *list, const void *data) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Insert the given data into the given linked list after the specified data.
*
* @param list The given linked list.
* @param data The data to insert.
* @param relative The data to insert after.
* @return A list pointer.
*
* This function inserts @p data to @p list after @p relative. If
* @p relative is not in the list, @p data is appended to the end of
* the list. If @p list is @c NULL, a new list is returned. If there
* are multiple instances of @p relative in the list, @p data is
* inserted after the first instance.On success, a new list pointer
* that should be used in place of the one given to this function is
* returned. Otherwise, the old pointer is returned.
*
* The following example code demonstrates how to ensure that the
* given data has been successfully inserted.
*
* @code
* Eina_List *list = NULL;
* extern void *my_data;
* extern void *relative_member;
*
* list = eina_list_append(list, relative_member);
* if (eina_error_get())
* {
* fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
* exit(-1);
* }
* list = eina_list_append_relative(list, my_data, relative_member);
* if (eina_error_get())
* {
* fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
* exit(-1);
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_append_relative(Eina_List *list, const void *data, const void *relative) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Append a list node to a linked list after the specified member
*
* @param list The given linked list.
* @param data The data to insert.
* @param relative The list node to insert after.
* @return A list pointer.
*
* This function inserts @p data to @p list after the list node
* @p relative. If @p list or @p relative are @c NULL, @p data is just
* appended to @p list using eina_list_append(). If @p list is
* @c NULL, a new list is returned. If there are multiple instances
* of @p relative in the list, @p data is inserted after the first
* instance. On success, a new list pointer that should be used in
* place of the one given to this function is returned. Otherwise, the
* old pointer is returned.
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_append_relative_list(Eina_List *list, const void *data, Eina_List *relative) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Prepend a data pointer to a linked list before the specified member
*
* @param list The given linked list.
* @param data The data to insert.
* @param relative The data to insert before.
* @return A list pointer.
*
* This function inserts @p data to @p list before @p relative. If
* @p relative is not in the list, @p data is prepended to the list
* with eina_list_prepend(). If @p list is @c NULL, a new list is
* returned. If there are multiple instances of @p relative in the
* list, @p data is inserted before the first instance. On success, a
* new list pointer that should be used in place of the one given to
* this function is returned. Otherwise, the old pointer is returned.
*
* The following code example demonstrates how to ensure that the
* given data has been successfully inserted.
*
* @code
* Eina_List *list = NULL;
* extern void *my_data;
* extern void *relative_member;
*
* list = eina_list_append(list, relative_member);
* if (eina_error_get_error())
* {
* fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
* exit(-1);
* }
* list = eina_list_prepend_relative(list, my_data, relative_member);
* if (eina_error_get())
* {
* fprintf(stderr, "ERROR: Memory is low. List allocation failed.\n");
* exit(-1);
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_prepend_relative(Eina_List *list, const void *data, const void *relative) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Prepend a list node to a linked list before the specified member
*
* @param list The given linked list.
* @param data The data to insert.
* @param relative The list node to insert before.
* @return A list pointer.
*
* This function inserts @p data to @p list before the list node
* @p relative. If @p list or @p relative are @c NULL, @p data is just
* prepended to @p list using eina_list_prepend(). If @p list is
* @c NULL, a new list is returned. If there are multiple instances
* of @p relative in the list, @p data is inserted before the first
* instance. On success, a new list pointer that should be used in
* place of the one given to this function is returned. Otherwise, the
* old pointer is returned.
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_prepend_relative_list(Eina_List *list, const void *data, Eina_List *relative) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Insert a new node into a sorted list.
*
* @param list The given linked list, @b must be sorted.
* @param func The function called for the sort.
* @param data The data to insert sorted.
* @return A list pointer.
*
* This function inserts values into a linked list assuming it was
* sorted and the result will be sorted. If @p list is @c NULLL, a new
* list is returned. On success, a new list pointer that should be
* used in place of the one given to this function is
* returned. Otherwise, the old pointer is returned. See eina_error_get().
*
* @note O(log2(n)) comparisons (calls to @p func) average/worst case
* performance as it uses eina_list_search_sorted_near_list() and thus
* is bounded to that. As said in eina_list_search_sorted_near_list(),
* lists do not have O(1) access time, so walking to the correct node
* can be costly, consider worst case to be almost O(n) pointer
* dereference (list walk).
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_sorted_insert(Eina_List *list, Eina_Compare_Cb func, const void *data) EINA_ARG_NONNULL(2, 3) EINA_WARN_UNUSED_RESULT;
/**
* @brief Remove the first instance of the specified data from the given list.
*
* @param list The given list.
* @param data The specified data.
* @return A list pointer.
*
* This function removes the first instance of @p data from
* @p list. If the specified data is not in the given list (this
* includes the case where @p data is @c NULL), nothing is done and the
* specified @p list returned. If @p list is @c NULL, @c NULL is returned,
* otherwise a new list pointer that should be used in place of the one
* passed to this function.
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_remove(Eina_List *list, const void *data) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Remove the specified list node.
*
* @param list The given linked list.
* @param remove_list The list node which is to be removed.
* @return A list pointer.
*
* This function removes the list node @p remove_list from @p list and
* frees the list node structure @p remove_list. If @p list is
* @c NULL, this function returns @c NULL. If @p remove_list is
* @c NULL, it returns @p list, otherwise, a new list pointer that
* should be used in place of the one passed to this function.
*
* The following code gives an example (notice we use EINA_LIST_FOREACH
* instead of EINA_LIST_FOREACH_SAFE because we stop the loop after
* removing the current node).
*
* @code
* extern Eina_List *list;
* Eina_List *l;
* extern void *my_data;
* void *data
*
* EINA_LIST_FOREACH(list, l, data)
* {
* if (data == my_data)
* {
* list = eina_list_remove_list(list, l);
* break;
* }
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_remove_list(Eina_List *list, Eina_List *remove_list) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Move the specified data to the head of the list.
*
* @param list The list handle to move the data.
* @param move_list The list node to move.
* @return A new list handle to replace the old one
*
* This function move @p move_list to the front of @p list. If list is
* @c NULL, @c NULL is returned. If @p move_list is @c NULL,
* @p list is returned. Otherwise, a new list pointer that should be
* used in place of the one passed to this function.
*
* Example:
* @code
* extern Eina_List *list;
* Eina_List *l;
* extern void *my_data;
* void *data;
*
* EINA_LIST_FOREACH(list, l, data)
* {
* if (data == my_data)
* {
* list = eina_list_promote_list(list, l);
* break;
* }
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_promote_list(Eina_List *list, Eina_List *move_list) EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Move the specified data to the tail of the list.
*
* @param list The list handle to move the data.
* @param move_list The list node to move.
* @return A new list handle to replace the old one
*
* This function move @p move_list to the back of @p list. If list is
* @c NULL, @c NULL is returned. If @p move_list is @c NULL,
* @p list is returned. Otherwise, a new list pointer that should be
* used in place of the one passed to this function.
*
* Example:
* @code
* extern Eina_List *list;
* Eina_List *l;
* extern void *my_data;
* void *data;
*
* EINA_LIST_FOREACH(list, l, data)
* {
* if (data == my_data)
* {
* list = eina_list_demote_list(list, l);
* break;
* }
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_demote_list(Eina_List *list, Eina_List *move_list);
/**
* @brief Find a member of a list and return the member.
*
* @param list The list to search for a data.
* @param data The data pointer to find in the list.
* @return The found member data pointer if found, @c NULL otherwise.
*
* This function searches in @p list from beginning to end for the
* first member whose data pointer is @p data. If it is found, @p data
* will be returned, otherwise @c NULL will be returned.
*
* Example:
* @code
* extern Eina_List *list;
* extern void *my_data;
*
* if (eina_list_data_find(list, my_data) == my_data)
* {
* printf("Found member %p\n", my_data);
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI void *eina_list_data_find(const Eina_List *list, const void *data) EINA_PURE EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Find a member of a list and return the list node containing that member.
*
* @param list The list to search for data.
* @param data The data pointer to find in the list.
* @return The found members list node on success, @c NULL otherwise.
*
* This function searches in @p list from beginning to end for the
* first member whose data pointer is @p data. If it is found, the
* list node containing the specified member is returned, otherwise
* @c NULL is returned.
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_data_find_list(const Eina_List *list, const void *data) EINA_PURE EINA_ARG_NONNULL(2) EINA_WARN_UNUSED_RESULT;
/**
* @brief Move a data pointer from one list to another
*
* @param to The list to move the data to
* @param from The list to move from
* @param data The data to move
* @return #EINA_TRUE on success, else #EINA_FALSE
*
* This function is a shortcut for doing the following:
* to = eina_list_append(to, data);
* from = eina_list_remove(from, data);
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_Bool eina_list_move(Eina_List **to, Eina_List **from, void *data);
/**
* @brief Move a list node from one list to another
*
* @param to The list to move the data to
* @param from The list to move from
* @param data The list node containing the data to move
* @return #EINA_TRUE on success, else #EINA_FALSE
*
* This function is a shortcut for doing the following:
* to = eina_list_append(to, data->data);
* from = eina_list_remove_list(from, data);
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_Bool eina_list_move_list(Eina_List **to, Eina_List **from, Eina_List *data);
/**
* @brief Free an entire list and all the nodes, ignoring the data contained.
* @param list The list to free
* @return A @c NULL pointer
*
* This function frees all the nodes of @p list. It does not free the
* data of the nodes. To free them, use #EINA_LIST_FREE.
*/
EAPI Eina_List *eina_list_free(Eina_List *list);
/**
* @brief Get the nth member's data pointer in a list.
*
* @param list The list to get the specified member number from.
* @param n The number of the element (0 being the first).
* @return The data pointer stored in the specified element.
*
* This function returns the data pointer of element number @p n, in
* the @p list. The first element in the array is element number 0. If
* the element number @p n does not exist, @c NULL is
* returned. Otherwise, the data of the found element is returned.
*
* @note Worst case is O(n).
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI void *eina_list_nth(const Eina_List *list, unsigned int n) EINA_PURE EINA_WARN_UNUSED_RESULT;
/**
* @brief Get the nth member's list node in a list.
*
* @param list The list to get the specfied member number from.
* @param n The number of the element (0 being the first).
* @return The list node stored in the numbered element.
*
* This function returns the list node of element number @p n, in
* @p list. The first element in the array is element number 0. If the
* element number @p n does not exist or @p list is @c NULL or @p n is
* greater than the count of elements in @p list minus 1, @c NULL is
* returned. Otherwise the list node stored in the numbered element is
* returned.
*
* @note Worst case is O(n).
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_nth_list(const Eina_List *list, unsigned int n) EINA_PURE EINA_WARN_UNUSED_RESULT;
/**
* @brief Reverse all the elements in the list.
*
* @param list The list to reverse.
* @return The list head after it has been reversed.
*
* This function reverses the order of all elements in @p list, so the
* last member is now first, and so on. If @p list is @c NULL, this
* functon returns @c NULL.
*
* @note @b in-place: this will change the given list, so you should
* now point to the new list head that is returned by this function.
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_reverse_clone()
* @see eina_list_iterator_reversed_new()
*/
EAPI Eina_List *eina_list_reverse(Eina_List *list) EINA_WARN_UNUSED_RESULT;
/**
* @brief Clone (copy) all the elements in the list in reverse order.
*
* @param list The list to reverse.
* @return The new list that has been reversed.
*
* This function reverses the order of all elements in @p list, so the
* last member is now first, and so on. If @p list is @c NULL, this
* functon returns @c NULL. This returns a copy of the given list.
*
* @note @b copy: this will copy the list and you should then
* eina_list_free() when it is not required anymore.
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_reverse()
* @see eina_list_clone()
*/
EAPI Eina_List *eina_list_reverse_clone(const Eina_List *list) EINA_WARN_UNUSED_RESULT;
/**
* @brief Clone (copy) all the elements in the list in exactly same order.
*
* @param list The list to clone.
* @return The new list that has been cloned.
*
* This function clone in order of all elements in @p list. If @p list
* is @c NULL, this functon returns @c NULL. This returns a copy of
* the given list.
*
* @note @b copy: this will copy the list and you should then
* eina_list_free() when it is not required anymore.
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_reverse_clone()
*/
EAPI Eina_List *eina_list_clone(const Eina_List *list) EINA_WARN_UNUSED_RESULT;
/**
* @brief Sort a list according to the ordering func will return.
*
* @param list The list handle to sort.
* @param limit The maximum number of list elements to sort.
* @param func A function pointer that can handle comparing the list data
* nodes.
* @return the new head of list.
*
* This function sorts @p list. @p size if the number of the first
* element to sort. If @p limit is 0 or greater than the number of
* elements in @p list, all the elements are sorted. @p func is used to
* compare two elements of @p list. If @p func is @c NULL, this function returns
* @p list.
*
* @note @b in-place: this will change the given list, so you should
* now point to the new list head that is returned by this function.
*
* @note Worst case is O(n * log2(n)) comparisons (calls to func()).
* That means that for 1,000,000 list sort will do 20,000,000 comparisons.
*
* Example:
* @code
* int
* sort_cb(const void *d1, const void *d2)
* {
* const char *txt = d1;
* const char *txt2 = d2;
*
* if(!txt) return(1);
* if(!txt2) return(-1);
*
* return(strcmp(txt, txt2));
* }
* extern Eina_List *list;
*
* list = eina_list_sort(list, eina_list_count(list), sort_cb);
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_sort(Eina_List *list, unsigned int limit, Eina_Compare_Cb func) EINA_ARG_NONNULL(3) EINA_WARN_UNUSED_RESULT;
/**
* @brief Merge two list.
*
* @param left Head list to merge.
* @param right Tail list to merge.
* @return A new merged list.
*
* This function puts right at the end of left and returns the head.
*
* Both left and right do not exist anymore after the merge.
*
* @note merge cost is O(n), being @b n the size of the smallest
* list. This is due the need to fix accounting of that segment,
* making count and last access O(1).
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_merge(Eina_List *left, Eina_List *right) EINA_WARN_UNUSED_RESULT;
/**
* @brief Merge two sorted list according to the ordering func will return.
*
* @param left First list to merge.
* @param right Second list to merge.
* @param func A function pointer that can handle comparing the list data
* nodes.
* @return A new sorted list.
*
* This function compares the head of @p left and @p right, and choose the
* smallest one to be head of the returned list. It will continue this process
* for all entry of both list.
*
* Both left and right lists are not vailid anymore after the merge and should
* not be used. If @p func is @c NULL, it will return @c NULL.
*
* Example:
* @code
* int
* sort_cb(void *d1, void *d2)
* {
* const char *txt = NULL;
* const char *txt2 = NULL;
*
* if(!d1) return(1);
* if(!d2) return(-1);
*
* return(strcmp((const char*)d1, (const char*)d2));
* }
* extern Eina_List *sorted1;
* extern Eina_List *sorted2;
*
* list = eina_list_sorted_merge(sorted1, sorted2, sort_cb);
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_sorted_merge(Eina_List *left, Eina_List *right, Eina_Compare_Cb func) EINA_ARG_NONNULL(3) EINA_WARN_UNUSED_RESULT;
/**
* @brief Split a list into 2 lists.
*
* @param list List to split.
* @param relative The list will be split after @p relative.
* @param right The head of the new right list.
* @return The new left list
*
* This function splits @p list into two lists ( left and right ) after the node @p relative. @p Relative
* will become the last node of the left list. If @p list or @p right are @c NULL list is returns.
* If @p relative is NULL right is set to @p list and @c NULL is returns.
* If @p relative is the last node of @p list list is returns and @p right is set to @c NULL.
*
* list does not exist anymore after the split.
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_List *eina_list_split_list(Eina_List *list, Eina_List *relative, Eina_List **right) EINA_WARN_UNUSED_RESULT;
/**
* @brief Returns node nearest to data is in the sorted list.
*
* @param list The list to search for data, @b must be sorted.
* @param func A function pointer that can handle comparing the list data nodes.
* @param data reference value to search.
* @param result_cmp if provided returns the result of
* func(node->data, data) node being the last (returned) node. If node
* was found (exact match), then it is 0. If returned node is smaller
* than requested data, it is less than 0 and if it's bigger it's
* greater than 0. It is the last value returned by func().
* @return the nearest node, @c NULL if not found.
*
* This function searches for a node containing @p data as it's data in @p list,
* if such a node exists it will be returned and @p result_cmp will be @p 0. If
* the data of no node in @p list is equal to @p data, the node with the nearest
* value to that will be returned and @p result_cmp will be the return value of
* @p func with @p data and the returned node's data as arguments.
*
* This function is useful for inserting an element in the list only in case it
* isn't already present in the list, the naive way of doing this would be:
* @code
* void *ptr = eina_list_data_find(list, "my data");
* if (!ptr)
* eina_list_sorted_insert(list, "my data");
* @endcode
*
* However this has the downside of walking through the list twice, once to
* check if the data is already present and another to insert the element in the
* corret position. This can be done more eficiently:
* @code
* int cmp_result;
* l = eina_list_search_sorted_near_list(list, cmp_func, "my data",
* &cmp_result);
* if (cmp_result > 0)
* list = eina_list_prepend_relative_list(list, "my data", l);
* else if (cmp_result < 0)
* list = eina_list_append_relative_list(list, "my data", l);
* @endcode
*
* If @a cmp_result is 0 the element is already in the list and we need not
* insert it, if @a cmp_result is greater than zero @a "my @a data" needs to
* come after @a l(the nearest node present), if less than zero before.
*
* @note O(log2(n)) average/worst case performance, for 1,000,000
* elements it will do a maximum of 20 comparisons. This is much
* faster than the 1,000,000 comparisons made naively walking the list
* from head to tail, so depending on the number of searches and
* insertions, it may be worth to eina_list_sort() the list and do the
* searches later. As lists do not have O(1) access time, walking to
* the correct node can be costly, consider worst case to be almost
* O(n) pointer dereference (list walk).
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_search_sorted_list()
* @see eina_list_sort()
* @see eina_list_sorted_merge()
*/
EAPI Eina_List *eina_list_search_sorted_near_list(const Eina_List *list, Eina_Compare_Cb func, const void *data, int *result_cmp);
/**
* @brief Returns node if data is in the sorted list.
*
* @param list The list to search for data, @b must be sorted.
* @param func A function pointer that can handle comparing the list data nodes.
* @param data reference value to search.
* @return the node if func(node->data, data) == 0, @c NULL if not found.
*
* This can be used to check if some value is inside the list and get
* the container node in this case. It should be used when list is
* known to be sorted as it will do binary search for results.
*
* Example: imagine user gives a string, you check if it's in the list
* before duplicating its contents.
*
* @note O(log2(n)) average/worst case performance, for 1,000,000
* elements it will do a maximum of 20 comparisons. This is much
* faster than the 1,000,000 comparisons made by
* eina_list_search_unsorted_list(), so depending on the number of
* searches and insertions, it may be worth to eina_list_sort() the
* list and do the searches later. As said in
* eina_list_search_sorted_near_list(), lists do not have O(1) access
* time, so walking to the correct node can be costly, consider worst
* case to be almost O(n) pointer dereference (list walk).
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_search_sorted()
* @see eina_list_sort()
* @see eina_list_sorted_merge()
* @see eina_list_search_unsorted_list()
* @see eina_list_search_sorted_near_list()
*/
EAPI Eina_List *eina_list_search_sorted_list(const Eina_List *list, Eina_Compare_Cb func, const void *data);
/**
* @brief Returns node data if it is in the sorted list.
*
* @param list The list to search for data, @b must be sorted.
* @param func A function pointer that can handle comparing the list data nodes.
* @param data reference value to search.
* @return the node value (@c node->data) if func(node->data, data) == 0,
* NULL if not found.
*
* This can be used to check if some value is inside the list and get
* the existing instance in this case. It should be used when list is
* known to be sorted as it will do binary search for results.
*
* Example: imagine user gives a string, you check if it's in the list
* before duplicating its contents.
*
* @note O(log2(n)) average/worst case performance, for 1,000,000
* elements it will do a maximum of 20 comparisons. This is much
* faster than the 1,000,000 comparisons made by
* eina_list_search_unsorted(), so depending on the number of
* searches and insertions, it may be worth to eina_list_sort() the
* list and do the searches later. As said in
* eina_list_search_sorted_near_list(), lists do not have O(1) access
* time, so walking to the correct node can be costly, consider worst
* case to be almost O(n) pointer dereference (list walk).
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_search_sorted_list()
* @see eina_list_sort()
* @see eina_list_sorted_merge()
* @see eina_list_search_unsorted_list()
*/
EAPI void *eina_list_search_sorted(const Eina_List *list, Eina_Compare_Cb func, const void *data);
/**
* @brief Returns node if data is in the unsorted list.
*
* @param list The list to search for data, may be unsorted.
* @param func A function pointer that can handle comparing the list data nodes.
* @param data reference value to search.
* @return the node if func(node->data, data) == 0, @c NULL if not found.
*
* This can be used to check if some value is inside the list and get
* the container node in this case.
*
* Example: imagine user gives a string, you check if it's in the list
* before duplicating its contents.
*
* @note this is expensive and may walk the whole list, it's order-N,
* that is for 1,000,000 elements list it may walk and compare
* 1,000,000 nodes.
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_search_sorted_list()
* @see eina_list_search_unsorted()
*/
EAPI Eina_List *eina_list_search_unsorted_list(const Eina_List *list, Eina_Compare_Cb func, const void *data);
/**
* @brief Returns node data if it is in the unsorted list.
*
* @param list The list to search for data, may be unsorted.
* @param func A function pointer that can handle comparing the list data nodes.
* @param data reference value to search.
* @return the node value (@c node->data) if func(node->data, data) == 0,
* @c NULL if not found.
*
* This can be used to check if some value is inside the list and get
* the existing instance in this case.
*
* Example: imagine user gives a string, you check if it's in the list
* before duplicating its contents.
*
* @note this is expensive and may walk the whole list, it's order-N,
* that is for 1,000,000 elements list it may walk and compare
* 1,000,000 nodes.
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_search_sorted()
* @see eina_list_search_unsorted_list()
*/
EAPI void *eina_list_search_unsorted(const Eina_List *list, Eina_Compare_Cb func, const void *data);
/**
* @brief Get the last list node in the list.
*
* @param list The list to get the last list node from.
* @return The last list node in the list.
*
* This function returns the last list node in the list @p list. If
* @p list is @c NULL or empty, @c NULL is returned.
*
* This is a order-1 operation (it takes the same short time
* regardless of the length of the list).
*
* @warning @p list must be a pointer to the first element of the list.
*/
static inline Eina_List *eina_list_last(const Eina_List *list) EINA_PURE EINA_WARN_UNUSED_RESULT;
/**
* @brief Get the next list node after the specified list node.
*
* @param list The list node to get the next list node from
* @return The next list node on success, @c NULL otherwise.
*
* This function returns the next list node after the current one in
* @p list. It is equivalent to list->next. If @p list is @c NULL or
* if no next list node exists, it returns @c NULL.
*
* @warning @p list must be a pointer to the first element of the list.
*/
static inline Eina_List *eina_list_next(const Eina_List *list) EINA_PURE EINA_WARN_UNUSED_RESULT;
/**
* @brief Get the previous list node before the specified list node.
*
* @param list The list node to get the previous list node from.
* @return The previous list node o success, @c NULL otherwise.
* if no previous list node exists
*
* This function returns the previous list node before the current one
* in @p list. It is equivalent to list->prev. If @p list is @c NULL or
* if no previous list node exists, it returns @c NULL.
*
* @warning @p list must be a pointer to the first element of the list.
*/
static inline Eina_List *eina_list_prev(const Eina_List *list) EINA_PURE EINA_WARN_UNUSED_RESULT;
/**
* @brief Get the list node data member.
*
* @param list The list node to get the data member of.
* @return The data member from the list node.
*
* This function returns the data member of the specified list node @p
* list. It is equivalent to list->data. If @p list is @c NULL, this
* function returns @c NULL.
*
* @warning @p list must be a pointer to the first element of the list.
*/
static inline void *eina_list_data_get(const Eina_List *list) EINA_PURE EINA_WARN_UNUSED_RESULT;
/**
* @brief Set the list node data member.
*
* @param list The list node to get the data member of.
* @param data The data member to the list node.
* @return The previous data value.
*
* This function set the data member @p data of the specified list node
* @p list. It returns the previous data of the node. If @p list is
* @c NULL, this function returns @c NULL.
*
* @warning @p list must be a pointer to the first element of the list.
*/
static inline void *eina_list_data_set(Eina_List *list, const void *data);
/**
* @brief Get the count of the number of items in a list.
*
* @param list The list whose count to return.
* @return The number of members in the list.
*
* This function returns how many members @p list contains. If the
* list is @c NULL, @c 0 is returned.
*
* NB: This is an order-1 operation and takes the same time regardless
* of the length of the list.
*
* @warning @p list must be a pointer to the first element of the list.
*/
static inline unsigned int eina_list_count(const Eina_List *list) EINA_PURE;
/**
* @brief Returned a new iterator associated to a list.
*
* @param list The list.
* @return A new iterator.
*
* This function returns a newly allocated iterator associated to @p
* list. If @p list is @c NULL or the count member of @p list is less
* or equal than 0, this function still returns a valid iterator that
* will always return false on eina_iterator_next(), thus keeping API
* sane.
*
* If the memory can not be allocated, NULL is returned
* and #EINA_ERROR_OUT_OF_MEMORY is set. Otherwise, a valid iterator
* is returned.
*
* @warning @p list must be a pointer to the first element of the list.
*
* @warning if the list structure changes then the iterator becomes
* invalid! That is, if you add or remove nodes this iterator
* behavior is undefined and your program may crash!
*/
EAPI Eina_Iterator *eina_list_iterator_new(const Eina_List *list) EINA_MALLOC EINA_WARN_UNUSED_RESULT;
/**
* @brief Returned a new reversed iterator associated to a list.
*
* @param list The list.
* @return A new iterator.
*
* This function returns a newly allocated iterator associated to @p
* list. If @p list is @c NULL or the count member of @p list is less
* or equal than 0, this function still returns a valid iterator that
* will always return false on eina_iterator_next(), thus keeping API
* sane.
*
* Unlike eina_list_iterator_new(), this will walk the list backwards.
*
* If the memory can not be allocated, NULL is returned
* and #EINA_ERROR_OUT_OF_MEMORY is set. Otherwise, a valid iterator
* is returned.
*
* @warning @p list must be a pointer to the first element of the list.
*
* @warning if the list structure changes then the iterator becomes
* invalid! That is, if you add or remove nodes this iterator
* behavior is undefined and your program may crash!
*/
EAPI Eina_Iterator *eina_list_iterator_reversed_new(const Eina_List *list) EINA_MALLOC EINA_WARN_UNUSED_RESULT;
/**
* @brief Returned a new accessor associated to a list.
*
* @param list The list.
* @return A new accessor.
*
* This function returns a newly allocated accessor associated to
* @p list. If @p list is @c NULL or the count member of @p list is
* less or equal than 0, this function returns @c NULL. If the memory can
* not be allocated, @c NULL is returned and #EINA_ERROR_OUT_OF_MEMORY is
* set. Otherwise, a valid accessor is returned.
*
* @warning @p list must be a pointer to the first element of the list.
*/
EAPI Eina_Accessor *eina_list_accessor_new(const Eina_List *list) EINA_MALLOC EINA_WARN_UNUSED_RESULT;
/**
* @def EINA_LIST_FOREACH
* @brief Macro to iterate over a list.
*
* @param list The list to iterate over.
* @param l A list that is used as an iterator and points to the current node.
* @param data Current item's data.
*
* This macro iterates over @p list from the first element to
* the last. @p data is the data related to the current element.
* @p l is an #Eina_List used as the list iterator.
*
* The following diagram ilustrates this macro iterating over a list of four
* elements("one", "two", "three" and "four"):
* @htmlonly
* <img src="eina-list-foreach.png" style="max-width: 100%;" />
* <a href="eina-list-foreach.png">Full-size</a>
* @endhtmlonly
* @image latex eina-list-foreach.eps width=\textwidth
*
* It can be used to free list data, as in the following example:
*
* @code
* Eina_List *list;
* Eina_List *l;
* char *data;
*
* // list is already filled,
* // its elements are just duplicated strings,
* // EINA_LIST_FOREACH will be used to free those strings
*
* EINA_LIST_FOREACH(list, l, data)
* free(data);
* eina_list_free(list);
* @endcode
*
* @note This is not the optimal way to release memory allocated to
* a list, since it iterates over the list twice.
* For an optimized algorithm, use EINA_LIST_FREE().
*
* @warning @p list must be a pointer to the first element of the list.
*
* @warning Be careful when deleting list nodes.
* If you remove the current node and continue iterating,
* the code will fail because the macro will not be able
* to get the next node. Notice that it's OK to remove any
* node if you stop the loop after that.
* For destructive operations such as this, consider
* using EINA_LIST_FOREACH_SAFE().
*/
#define EINA_LIST_FOREACH(list, l, data) \
for (l = list, \
data = eina_list_data_get(l); \
l; \
l = eina_list_next(l), \
data = eina_list_data_get(l))
/**
* @def EINA_LIST_REVERSE_FOREACH
* @brief Macro to iterate over a list in the reverse order.
*
* @param list The list to iterate over.
* @param l A list that is used as an iterator and points to the current node.
* @param data Current item's data.
*
* This macro works like EINA_LIST_FOREACH, but iterates from the
* last element of a list to the first.
* @p data is the data related to the current element, while @p l
* is an #Eina_List that is used as the list iterator.
*
* The following diagram ilustrates this macro iterating over a list of four
* elements("one", "two", "three" and "four"):
* @htmlonly
* <img src="eina-list-reverse-foreach.png" style="max-width: 100%;" />
* <a href="eina-list-reverse-foreach.png">Full-size</a>
* @endhtmlonly
* @image latex eina-list-reverse-foreach.eps width=\textwidth
*
* It can be used to free list data, as in the following example:
*
* @code
* Eina_List *list;
* Eina_List *l;
* char *data;
*
* // list is already filled,
* // its elements are just duplicated strings,
* // EINA_LIST_REVERSE_FOREACH will be used to free those strings
*
* EINA_LIST_REVERSE_FOREACH(list, l, data)
* free(data);
* eina_list_free(list);
* @endcode
*
* @note This is not the optimal way to release memory allocated to
* a list, since it iterates over the list twice.
* For an optimized algorithm, use EINA_LIST_FREE().
*
* @warning @p list must be a pointer to the first element of the list.
*
* @warning Be careful when deleting list nodes.
* If you remove the current node and continue iterating,
* the code will fail because the macro will not be able
* to get the next node. Notice that it's OK to remove any
* node if you stop the loop after that.
* For destructive operations such as this, consider
* using EINA_LIST_REVERSE_FOREACH_SAFE().
*/
#define EINA_LIST_REVERSE_FOREACH(list, l, data) \
for (l = eina_list_last(list), \
data = eina_list_data_get(l); \
l; \
l = eina_list_prev(l), \
data = eina_list_data_get(l))
/**
* @def EINA_LIST_FOREACH_SAFE
* @brief Macro to iterate over a list with support for node deletion.
*
* @param list The list to iterate over.
* @param l A list that is used as an iterator and points to the current node.
* @param l_next A list that is used as an iterator and points to the next node.
* @param data Current item's data.
*
* This macro iterates over @p list from the first element to
* the last. @p data is the data related to the current element.
* @p l is an #Eina_List used as the list iterator.
*
* Since this macro stores a pointer to the next list node in @p l_next,
* deleting the current node and continuing looping is safe.
*
* The following diagram ilustrates this macro iterating over a list of four
* elements("one", "two", "three" and "four"):
* @htmlonly
* <img src="eina-list-foreach-safe.png" style="max-width: 100%;" />
* <a href="eina-list-foreach-safe.png">Full-size</a>
* @endhtmlonly
* @image latex eina-list-foreach-safe.eps width=\textwidth
*
* This macro can be used to free list nodes, as in the following example:
*
* @code
* Eina_List *list;
* Eina_List *l;
* Eina_List *l_next;
* char *data;
*
* // list is already filled,
* // its elements are just duplicated strings,
* // EINA_LIST_FOREACH_SAFE will be used to free elements that match "key".
*
* EINA_LIST_FOREACH_SAFE(list, l, l_next, data)
* if (strcmp(data, "key") == 0) {
* free(data);
* list = eina_list_remove_list(list, l);
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
#define EINA_LIST_FOREACH_SAFE(list, l, l_next, data) \
for (l = list, \
l_next = eina_list_next(l), \
data = eina_list_data_get(l); \
l; \
l = l_next, \
l_next = eina_list_next(l), \
data = eina_list_data_get(l))
/**
* @def EINA_LIST_REVERSE_FOREACH_SAFE
* @brief Macro to iterate over a list in the reverse order with support
* for deletion.
*
* @param list The list to iterate over.
* @param l A list that is used as an iterator and points to the current node.
* @param l_prev A list that is used as an iterator and points to the previous node.
* @param data Current item's data.
*
* This macro works like EINA_LIST_FOREACH_SAFE, but iterates from the
* last element of a list to the first.
* @p data is the data related to the current element, while @p l
* is an #Eina_List that is used as the list iterator.
*
* Since this macro stores a pointer to the previous list node in @p l_prev,
* deleting the current node and continuing looping is safe.
*
* The following diagram ilustrates this macro iterating over a list of four
* elements("one", "two", "three" and "four"):
* @htmlonly
* <img src="eina-list-reverse-foreach-safe.png" style="max-width: 100%;" />
* <a href="eina-list-reverse-foreach-safe.png">Full-size</a>
* @endhtmlonly
* @image latex eina-list-reverse-foreach-safe.eps width=\textwidth
*
* This macro can be used to free list nodes, as in the following example:
*
* @code
* Eina_List *list;
* Eina_List *l;
* Eina_List *l_prev;
* char *data;
*
* // list is already filled,
* // its elements are just duplicated strings,
* // EINA_LIST_REVERSE_FOREACH_SAFE will be used to free elements that match "key".
*
* EINA_LIST_REVERSE_FOREACH_SAFE(list, l, l_prev, data)
* if (strcmp(data, "key") == 0) {
* free(data);
* list = eina_list_remove_list(list, l);
* }
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*/
#define EINA_LIST_REVERSE_FOREACH_SAFE(list, l, l_prev, data) \
for (l = eina_list_last(list), \
l_prev = eina_list_prev(l), \
data = eina_list_data_get(l); \
l; \
l = l_prev, \
l_prev = eina_list_prev(l), \
data = eina_list_data_get(l))
/**
* @def EINA_LIST_FREE
* @brief Macro to remove each list node while having access to each node's data.
*
* @param list The list that will be cleared.
* @param data Current node's data.
*
* This macro will call #eina_list_remove_list for each list node, and store
* the data contained in the current node in @p data.
*
* The following diagram ilustrates this macro iterating over a list of four
* elements("one", "two", "three" and "four"):
* @htmlonly
* <img src="eina-list-free.png" style="max-width: 100%;" />
* <a href="eina-list-free.png">Full-size</a>
* @endhtmlonly
* @image latex eina-list-free.eps width=\textwidth
*
* If you do not need to release node data, it is easier to call #eina_list_free().
*
* @code
* Eina_List *list;
* char *data;
*
* // list is already filled,
* // its elements are just duplicated strings,
*
* EINA_LIST_FREE(list, data)
* free(data);
* @endcode
*
* @warning @p list must be a pointer to the first element of the list.
*
* @see eina_list_free()
*/
#define EINA_LIST_FREE(list, data) \
for (data = eina_list_data_get(list); \
list; \
list = eina_list_remove_list(list, list), \
data = eina_list_data_get(list))
/**
* @def EINA_LIST_LAST_DATA_GET
* @brief Macro to return the last list node's data
*
* @param list The list
* @return The node's data, or @c NULL on being passed a @c NULL pointer
*
* This macro is a shortcut for typing eina_list_data_get(eina_list_last())
* @since 1.8
*/
#define eina_list_last_data_get(list) \
eina_list_data_get(eina_list_last(list))
#include "eina_inline_list.x"
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
#endif /* EINA_LIST_H_ */
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