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-/* 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_ACCESSOR_H__
-#define EINA_ACCESSOR_H__
-
-#include "eina_config.h"
-
-#include "eina_types.h"
-#include "eina_magic.h"
-
-/**
- * @page eina_accessor_example_01_page Eina_Accessor usage
- * @dontinclude eina_accessor_01.c
- *
- * We start by including necessary headers, declaring variables and
- * initializing eina:
- * @skip #include
- * @until eina_init
- *
- * Next we populate our array and list:
- * @until }
- *
- * Now that we have two containers populated we can actually start the example
- * and create an accessor:
- * @until accessor_new
- *
- * Once having the accessor we can use it to access certain elements in the
- * container:
- * @until }
- * @note Unlike iterators accessors allow us non-linear access, which allows us
- * to print only the odd elements in the container.
- *
- * As with every other resource we allocate we need to free the accessor(and the
- * array):
- * @until array_free
- *
- * Now we create another accessor, this time for the list:
- * @until accessor_new
- *
- * And now the interesting bit, we use the same code we used above to print
- * parts of the array to print parts of the list:
- * @until }
- *
- * And to free the list we use a gimmick, instead of freeing @a list, we ask the
- * accessor for it's container and free that:
- * @until list_free
- *
- * Finally we shut eina down and leave:
- * @until }
- *
- * The full source code can be found on the examples folder
- * on the @ref eina_accessor_01_c "eina_accessor_01.c" file.
- */
-
-/**
- * @page eina_accessor_01_c Eina_Accessor usage example
- *
- * @include eina_accessor_01.c
- * @example eina_accessor_01.c
- */
-
-/**
- * @addtogroup Eina_Accessor_Group Accessor Functions
- *
- * @brief These functions manage accessor on containers.
- *
- * These functions allow to access elements of a container in a
- * generic way, without knowing which container is used (a bit like
- * iterators in the C++ STL). Accessors allows random access (that is, any
- * element in the container). For sequential access, see
- * @ref Eina_Iterator_Group.
- *
- * An accessor is created from container data types, so no creation
- * function is available here. An accessor is deleted with
- * eina_accessor_free(). To get the data of an element at a given
- * position, use eina_accessor_data_get(). To call a function on
- * chosen elements of a container, use eina_accessor_over().
- *
- * See an example @ref eina_accessor_example_01_page "here".
- */
-
-/**
- * @addtogroup Eina_Content_Access_Group Content Access
- *
- * @{
- */
-
-/**
- * @defgroup Eina_Accessor_Group Accessor Functions
- *
- * @{
- */
-
-/**
- * @typedef Eina_Accessor
- * Abstract type for accessors.
- */
-typedef struct _Eina_Accessor Eina_Accessor;
-
-/**
- * @typedef Eina_Accessor_Get_At_Callback
- * Type for a callback that returns the data of a container as the given index.
- */
-typedef Eina_Bool (*Eina_Accessor_Get_At_Callback)(Eina_Accessor *it,
-                                                   unsigned int   idx,
-                                                   void         **data);
-
-/**
- * @typedef Eina_Accessor_Get_Container_Callback
- * Type for a callback that returns the container.
- */
-typedef void *(*Eina_Accessor_Get_Container_Callback)(Eina_Accessor *it);
-
-/**
- * @typedef Eina_Accessor_Free_Callback
- * Type for a callback that frees the container.
- */
-typedef void (*Eina_Accessor_Free_Callback)(Eina_Accessor *it);
-
-/**
- * @typedef Eina_Accessor_Lock_Callback
- * Type for a callback that lock the container.
- */
-typedef Eina_Bool (*Eina_Accessor_Lock_Callback)(Eina_Accessor *it);
-
-/**
- * @struct _Eina_Accessor
- * Type to provide random access to data structures.
- */
-struct _Eina_Accessor
-{
-#define EINA_ACCESSOR_VERSION 1
-   int                                  version; /**< Version of the Accessor API. */
-
-   Eina_Accessor_Get_At_Callback        get_at        EINA_ARG_NONNULL(1, 3) EINA_WARN_UNUSED_RESULT; /**< Callback called when a data element is requested. */
-   Eina_Accessor_Get_Container_Callback get_container EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT; /**< Callback called when the container is requested. */
-   Eina_Accessor_Free_Callback          free          EINA_ARG_NONNULL(1); /**< Callback called when the container is freed. */
-
-   Eina_Accessor_Lock_Callback          lock          EINA_WARN_UNUSED_RESULT; /**< Callback called when the container is locked. */
-   Eina_Accessor_Lock_Callback          unlock        EINA_WARN_UNUSED_RESULT; /**< Callback called when the container is unlocked. */
-
-#define EINA_MAGIC_ACCESSOR 0x98761232
-   EINA_MAGIC
-};
-
-/**
- * @def FUNC_ACCESSOR_GET_AT(Function)
- * Helper macro to cast @p Function to a Eina_Accessor_Get_At_Callback.
- */
-#define FUNC_ACCESSOR_GET_AT(Function)        ((Eina_Accessor_Get_At_Callback)Function)
-
-/**
- * @def FUNC_ACCESSOR_GET_CONTAINER(Function)
- * Helper macro to cast @p Function to a Eina_Accessor_Get_Container_Callback.
- */
-#define FUNC_ACCESSOR_GET_CONTAINER(Function) ((Eina_Accessor_Get_Container_Callback)Function)
-
-/**
- * @def FUNC_ACCESSOR_FREE(Function)
- * Helper macro to cast @p Function to a Eina_Accessor_Free_Callback.
- */
-#define FUNC_ACCESSOR_FREE(Function)          ((Eina_Accessor_Free_Callback)Function)
-
-/**
- * @def FUNC_ACCESSOR_LOCK(Function)
- * Helper macro to cast @p Function to a Eina_Iterator_Lock_Callback.
- */
-#define FUNC_ACCESSOR_LOCK(Function)          ((Eina_Accessor_Lock_Callback)Function)
-
-
-/**
- * @brief Free an accessor.
- *
- * @param accessor The accessor to free.
- *
- * This function frees @p accessor if it is not @c NULL;
- */
-EAPI void      eina_accessor_free(Eina_Accessor *accessor) EINA_ARG_NONNULL(1);
-
-/**
- * @brief Retrieve the data of an accessor at a given position.
- *
- * @param accessor The accessor.
- * @param position The position of the element.
- * @param data The pointer that stores the data to retrieve.
- * @return #EINA_TRUE on success, #EINA_FALSE otherwise.
- *
- * This function retrieves the data of the element pointed by
- * @p accessor at the porition @p position, and stores it in
- * @p data. If @p accessor is @c NULL or if an error occurred,
- * #EINA_FALSE is returned, otherwise EINA_TRUE is returned.
- */
-EAPI Eina_Bool eina_accessor_data_get(Eina_Accessor *accessor,
-                                      unsigned int   position,
-                                      void         **data) EINA_ARG_NONNULL(1);
-
-/**
- * @brief Return the container of an accessor.
- *
- * @param accessor The accessor.
- * @return The container which created the accessor.
- *
- * This function returns the container which created @p accessor. If
- * @p accessor is @c NULL, this function returns @c NULL.
- */
-EAPI void *eina_accessor_container_get(Eina_Accessor *accessor) EINA_ARG_NONNULL(1) EINA_PURE;
-
-/**
- * @brief Iterate over the container and execute a callback on chosen elements.
- *
- * @param accessor The accessor.
- * @param cb The callback called on the chosen elements.
- * @param start The position of the first element.
- * @param end The position of the last element.
- * @param fdata The data passed to the callback.
- *
- * This function iterates over the elements pointed by @p accessor,
- * starting from the element at position @p start and ending to the
- * element at position @p end. For Each element, the callback
- * @p cb is called with the data @p fdata. If @p accessor is @c NULL
- * or if @p start is greter or equal than @p end, the function returns
- * immediately.
- */
-EAPI void  eina_accessor_over(Eina_Accessor *accessor,
-                              Eina_Each_Cb   cb,
-                              unsigned int   start,
-                              unsigned int   end,
-                              const void    *fdata) EINA_ARG_NONNULL(1, 2);
-
-/**
- * @brief Lock the container of the accessor.
- *
- * @param accessor The accessor.
- * @return #EINA_TRUE on success, #EINA_FALSE otherwise.
- *
- * If the container of the @p accessor permits it, it will be locked. When a
- * container is locked calling eina_accessor_over() on it will return
- * immediately. If @p accessor is @c NULL or if a problem occurred, #EINA_FALSE
- * is returned, otherwise #EINA_TRUE is returned. If the container isn't
- * lockable, it will return EINA_TRUE.
- *
- * @warning None of the existing eina data structures are lockable.
- */
-EAPI Eina_Bool eina_accessor_lock(Eina_Accessor *accessor) EINA_ARG_NONNULL(1);
-
-/**
- * @brief Unlock the container of the accessor.
- *
- * @param accessor The accessor.
- * @return #EINA_TRUE on success, #EINA_FALSE otherwise.
- *
- * If the container of the @p accessor permits it and was previously
- * locked, it will be unlocked. If @p accessor is @c NULL or if a
- * problem occurred, #EINA_FALSE is returned, otherwise #EINA_TRUE
- * is returned. If the container is not lockable, it will return
- * EINA_TRUE.
- *
- * @warning None of the existing eina data structures are lockable.
- */
-EAPI Eina_Bool eina_accessor_unlock(Eina_Accessor *accessor) EINA_ARG_NONNULL(1);
-
-/**
- * @def EINA_ACCESSOR_FOREACH
- * @brief Macro to iterate over all elements easily.
- *
- * @param accessor The accessor to use.
- * @param counter A counter used by eina_accessor_data_get() when
- * iterating over the container.
- * @param data Where to store * data, must be a pointer support getting
- * its address since * eina_accessor_data_get() requires a pointer to
- * pointer!
- *
- * This macro allows a convenient way to loop over all elements in an
- * accessor, 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 accessors:
- *
- * @code
- * Eina_List     *list;
- * Eina_Accessor *accessor;
- * unsigned int   i;
- * char          *data;
- *
- * // list is already filled,
- * // its elements are just duplicated strings
- *
- * accessor = eina_list_accessor_new(list);
- * EINA_ACCESSOR_FOREACH(accessor, i, data)
- *   free(data);
- * eina_accessor_free(accessor);
- * eina_list_free(list);
- * @endcode
- *
- * @note if the datatype provides both iterators and accessors prefer
- *    to use iterators to iterate over, as they're likely to be more
- *    optimized for such task.
- *
- * @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 accessors,
- *    do not modify the accessed 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 accessors themselves,
- *    rather in the accessors implementations to keep them as simple
- *    and fast as possible.
- */
-#define EINA_ACCESSOR_FOREACH(accessor, counter, data)                  \
-  for ((counter) = 0;                                                   \
-       eina_accessor_data_get((accessor), (counter), (void **)(void *)&(data)); \
-       (counter)++)
-
-/**
- * @}
- */
-
-/**
- * @}
- */
-
-#endif