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/* EINA - EFL data type library
 * Copyright (C) 2012 ProFUSION embedded systems
 *
 * 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_INARRAY_H_
#define EINA_INARRAY_H_

#include "eina_types.h"
#include "eina_iterator.h"
#include "eina_accessor.h"

/**
 * @page eina_inarray_example_01 Eina inline array usage
 * @dontinclude eina_inarray_01.c
 *
 * This example will create an inline array of chars, add some elements, print
 * it, re-purpose the array to store ints, add some elements and print that.
 *
 * We'll start with a function to compare ints we need this because the '>'
 * operator is not a function and can't be used where Eina_Compare_Cb is needed.
 * @skip int
 * @until }
 *
 * And then move on to the code we actually care about, starting with variable
 * declarations and eina initialization:
 * @until eina_init
 *
 * Creating an inline array is very simple, we just need to know what type we
 * want to store:
 * @until inarray_new
 * @note The second parameter(the step) is left at zero which means that eina
 * will choose an appropriate value, this should @b only be changed if it's
 * known, beforehand, how many elements the array will have.
 *
 * Once we have an array we can start adding elements to it. Because the
 * insertion function expect a memory address we have to put the value we want
 * to store in a variable(this should be no problem since in real world usage
 * that's usually where the value will be anyways):
 * @until push
 * @note Because the inline array copies the value given to it we can later
 * change @c ch, which we do, without affecting the contents of the array.
 *
 * So let's add some more elements:
 * @until push
 * @until push
 * @until push
 *
 * We will then iterate over our array and print every position of it. The thing
 * to note here is not so much the values which will be the expected 'a', 'b',
 * 'c' and 'd', but rather the memory address of these values, they are
 * sequential:
 * @until printf
 * @until printf
 *
 * We'll now use our array to store ints, so we need to first erase every member
 * currently on the array:
 * @until _flush
 *
 * And then to be able to store a different type on the same array we use the
 * eina_inarray_step_set() function, which is just like the eina_inarray_new()
 * function except it receives already allocated memory. This time we're going
 * to ask eina to use a step of size 4 because that's how many elements we'll be
 * putting on the array:
 * @until _step_set
 * @note Strictly speaking the reason to call eina_inarray_step_set() is not
 * because we're storing different type, but rather because our types have
 * different sizes. Eina inline arrays don't actually know anything about types,
 * they only deal in blocks of memory of a given size.
 * @note Since eina_inarray_step_set() receives already allocated memory you can(and
 * it is in fact good practice) use inline arrays not declared as pointers:
 * @code
 * Eina_Inarray arr;
 * eina_inarray_step_set(&arr, sizeof(arr), sizeof(int), 4);
 * @endcode
 *
 * And now to add our integer values to the array:
 * @until push
 * @until push
 * @until push
 *
 * Just to change things up a bit we've left out the 99 value, but will still
 * add it in such a way to keep the array ordered. There are many ways to do
 * this, we could use eina_inarray_insert_at(), or we could change the value
 * of the last member using eina_inarray_replace_at() and then append the values
 * in the right order, but for no particular reason we're going to use
 * eina_inarray_insert_sorted() instead:
 * @until insert_sorted
 *
 * We then print the size of our array, and the array itself, much like last
 * time the values are not surprising, and neither should it be that the memory
 * addresses are contiguous:
 * @until printf
 * @until printf
 *
 * Once done we free our array and shutdown eina:
 * @until }
 *
 * The source for this example: @ref eina_inarray_01_c
 */

/**
 * @page eina_inarray_01_c eina_inarray_01.c
 * @include eina_inarray_01.c
 * @example eina_inarray_01.c
 */

/**
 * @page eina_inarray_example_02 Eina inline array of strings
 * @dontinclude eina_inarray_02.c
 *
 * This example will create an inline array of strings, add some elements and
 * then print them. This example is based on @ref eina_array_01_example_page and
 * @ref eina_inarray_example_01.
 *
 * We start with some variable declarations and eina initialization:
 * @skip int
 * @until eina_init
 *
 * We then create the array much like we did on @ref eina_inarray_example_01 :
 * @until inarray_new
 *
 * The point were this example significantly differs from the first eina inline
 * array example. We'll not be adding the strings themselves to the array since
 * their size varies, we'll store pointer to the strings instead. We therefore
 * use @c char** to populate our inline array:
 * @until }
 *
 * The source for this example: @ref eina_inarray_02_c
 */

/**
 * @page eina_inarray_02_c eina_inarray_02.c
 * @include eina_inarray_02.c
 * @example eina_inarray_02.c
 */

/**
 * @addtogroup Eina_Data_Types_Group Data Types
 *
 * @since 1.2
 *
 * @{
 */

/**
 * @addtogroup Eina_Containers_Group Containers
 *
 * @{
 */

/**
 * @defgroup Eina_Inline_Array_Group Inline Array
 *
 * Inline array is a container that stores the data itself not pointers to data,
 * this means there is no memory fragmentation, also for small data types(such
 * as char, short, int, etc.) it's more memory efficient.
 *
 * Usage of the inline array is very similar to that of other
 * @ref Eina_Containers_Group, like all arrays adding elements to the beginning
 * of the array is a lot more costly than appending, so those operations should
 * be minimized.
 *
 * Examples:
 * @li @ref eina_inarray_example_01
 * @li @ref eina_inarray_example_02
 *
 * @{
 */


/**
 * @typedef Eina_Inarray
 * Inlined array type.
 *
 * @since 1.2
 */
typedef struct _Eina_Inarray Eina_Inarray;

/**
 * Inline array structure, use #Eina_Inarray typedef instead.
 *
 * Do not modify these fields directly, use eina_inarray_step_set() or
 * eina_inarray_new() instead.
 *
 * @since 1.2
 */
struct _Eina_Inarray
{
#define EINA_ARRAY_VERSION 1
   int          version; /**< Should match EINA_ARRAY_VERSION used when compiled your apps, provided for ABI compatibility */

   unsigned int member_size; /**< byte size of each entry in members */
   unsigned int len; /**< number of elements used in members */
   unsigned int max; /**< number of elements allocated in members */
   unsigned int step; /**< amount to grow number of members allocated */
   void *members; /**< actual array of elements */
   EINA_MAGIC
};

/**
 * @brief Create new inline array.
 *
 * @param member_size size of each member in the array.
 * @param step when resizing the array, do this using the following
 *        extra amount.
 * @return The new inline array table or @c NULL on failure.
 *
 * Create a new array where members are inlined in a sequence. Each
 * member has @a member_size bytes.
 *
 * If the @a step is 0, then a safe default is chosen.
 *
 * On failure, @c NULL is returned. If @a member_size is zero, then @c NULL
 * is returned.
 *
 * @see eina_inarray_free()
 *
 * @since 1.2
 */
EAPI Eina_Inarray *eina_inarray_new(unsigned int member_size,
                                    unsigned int step) EINA_MALLOC EINA_WARN_UNUSED_RESULT;

/**
 * @brief Free array and its members.
 * @param array array object
 *
 * @see eina_inarray_flush()
 *
 * @since 1.2
 */
EAPI void eina_inarray_free(Eina_Inarray *array) EINA_ARG_NONNULL(1);

/**
 * @brief Initialize inline array.
 * @param array array object to initialize.
 * @param member_size size of each member in the array.
 * @param step when resizing the array, do this using the following
 *        extra amount.
 *
 * Initialize array. If the @a step is @c 0, then a safe default is
 * chosen.
 *
 * This is useful for arrays inlined into other structures or
 * allocated at stack.
 *
 * @see eina_inarray_flush()
 *
 * @since 1.2
 */
EAPI void eina_inarray_step_set(Eina_Inarray *array,
                                unsigned int sizeof_eina_inarray,
                                unsigned int member_size,
                                unsigned int step) EINA_ARG_NONNULL(1);

/**
 * @brief Remove every member from array.
 * @param array array object
 *
 * @since 1.2
 */
EAPI void eina_inarray_flush(Eina_Inarray *array) EINA_ARG_NONNULL(1);

/**
 * @brief Copy the data as the last member of the array.
 * @param array array object
 * @param data data to be copied at the end
 * @return the index of the new member or -1 on errors.
 *
 * Copies the given pointer contents at the end of the array. The
 * pointer is not referenced, instead it's contents is copied to the
 * members array using the previously defined @c member_size.
 *
 * @see eina_inarray_insert_at().
 *
 * @since 1.2
 */
EAPI int eina_inarray_push(Eina_Inarray *array,
                           const void *data) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Allocate new item at the end of the array.
 * @param array array object
 * @param size number of new item to allocate
 *
 * The returned pointer is only valid until you use any other eina_inarray
 * function.
 *
 * @since 1.8
 */
EAPI void *eina_inarray_grow(Eina_Inarray *array, unsigned int size);

/**
 * @brief Copy the data to array at position found by comparison function
 * @param array array object
 * @param data data to be copied
 * @param compare compare function
 * @return the index of the new member or @c -1 on errors.
 *
 * Copies the given pointer contents at the array position defined by
 * given @a compare function. The pointer is not referenced, instead
 * it's contents is copied to the members array using the previously
 * defined @c member_size.
 *
 * The data given to @a compare function are the pointer to member
 * memory itself, do no change it.
 *
 * @see eina_inarray_insert_sorted()
 * @see eina_inarray_insert_at()
 * @see eina_inarray_push()
 *
 * @since 1.2
 */
EAPI int eina_inarray_insert(Eina_Inarray *array,
                             const void *data,
                             Eina_Compare_Cb compare) EINA_ARG_NONNULL(1, 2, 3);

/**
 * @brief Copy the data to array at position found by comparison function
 * @param array array object
 * @param data data to be copied
 * @param compare compare function
 * @return the index of the new member or @c -1 on errors.
 *
 * Copies the given pointer contents at the array position defined by
 * given @a compare function. The pointer is not referenced, instead
 * it's contents is copied to the members array using the previously
 * defined @c member_size.
 *
 * The data given to @a compare function are the pointer to member
 * memory itself, do no change it.
 *
 * This variation will optimize insertion position assuming the array
 * is already sorted by doing binary search.
 *
 * @see eina_inarray_sort()
 *
 * @since 1.2
 */
EAPI int eina_inarray_insert_sorted(Eina_Inarray *array,
                                    const void *data,
                                    Eina_Compare_Cb compare) EINA_ARG_NONNULL(1, 2, 3);

/**
 * @brief Find data and remove matching member
 * @param array array object
 * @param data data to be found and removed
 * @return the index of the removed member or @c -1 on errors.
 *
 * Find data in the array and remove it. Data may be an existing
 * member of array (then optimized) or the contents will be matched
 * using memcmp().
 *
 * @see eina_inarray_pop()
 * @see eina_inarray_remove_at()
 *
 * @since 1.2
 */
EAPI int eina_inarray_remove(Eina_Inarray *array,
                             const void *data) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Removes the last member of the array
 * @param array array object
 * @return the data poped out of the array.
 *
 * Note: The data could be considered valid only until any other operation touch the Inarray.
 *
 * @since 1.2
 */
EAPI void *eina_inarray_pop(Eina_Inarray *array) EINA_ARG_NONNULL(1);

/**
 * @brief Get the member at given position
 * @param array array object
 * @param position member position
 * @return pointer to current member memory.
 *
 * Gets the member given its position in the array. It is a pointer to
 * its current memory, then it can be invalidated with functions that
 * changes the array such as eina_inarray_push(),
 * eina_inarray_insert_at() or eina_inarray_remove_at() or variants.
 *
 * See also eina_inarray_lookup() and eina_inarray_lookup_sorted().
 *
 * @since 1.2
 */
EAPI void *eina_inarray_nth(const Eina_Inarray *array,
                            unsigned int position) EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;

/**
 * @brief Copy the data at given position in the array
 * @param array array object
 * @param position where to insert the member
 * @param data data to be copied at position
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * Copies the given pointer contents at the given @a position in the
 * array. The pointer is not referenced, instead it's contents is
 * copied to the members array using the previously defined
 * @c member_size.
 *
 * All the members from @a position to the end of the array are
 * shifted to the end.
 *
 * If @a position is equal to the end of the array (equals to
 * eina_inarray_count()), then the member is appended.
 *
 * If @a position is bigger than the array length, it will fail.
 *
 * @since 1.2
 */
EAPI Eina_Bool eina_inarray_insert_at(Eina_Inarray *array,
                                      unsigned int position,
                                      const void *data) EINA_ARG_NONNULL(1, 3);

/**
 * @brief Opens a space at given position, returning its pointer.
 * @param array array object
 * @param position where to insert first member (open/allocate space)
 * @param member_count how many times member_size bytes will be allocated.
 * @return pointer to first member memory allocated or @c NULL on errors.
 *
 * This is similar to eina_inarray_insert_at(), but useful if the
 * members contents are still unknown or unallocated. It will make
 * room for the required number of items and return the pointer to the
 * first item, similar to malloc(member_count * member_size), with the
 * guarantee all memory is within members array.
 *
 * The new member memory is undefined, it's not automatically zeroed.
 *
 * All the members from @a position to the end of the array are
 * shifted to the end.
 *
 * If @a position is equal to the end of the array (equals to
 * eina_inarray_count()), then the member is appended.
 *
 * If @a position is bigger than the array length, it will fail.
 *
 * @since 1.2
 */
EAPI void *eina_inarray_alloc_at(Eina_Inarray *array,
                                 unsigned int position,
                                 unsigned int member_count) EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;

/**
 * @brief Copy the data over the given position.
 * @param array array object
 * @param position where to replace the member
 * @param data data to be copied at position
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * Copies the given pointer contents at the given @a position in the
 * array. The pointer is not referenced, instead it's contents is
 * copied to the members array using the previously defined
 * @c member_size.
 *
 * If @a position does not exist, it will fail.
 *
 * @since 1.2
 */
EAPI Eina_Bool eina_inarray_replace_at(Eina_Inarray *array,
                                       unsigned int position,
                                       const void *data) EINA_ARG_NONNULL(1, 3);

/**
 * @brief Remove member at given position
 * @param array array object
 * @param position position to be removed
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * The member is removed from array and any members after it are moved
 * towards the array head.
 *
 * See also eina_inarray_pop() and eina_inarray_remove().
 *
 * @since 1.2
 */
EAPI Eina_Bool eina_inarray_remove_at(Eina_Inarray *array,
                                      unsigned int position) EINA_ARG_NONNULL(1);

/**
 * @brief Reverse members in the array.
 * @param array array object
 *
 * If you do not want to change the array, just walk its elements
 * backwards, then use EINA_INARRAY_REVERSE_FOREACH() macro.
 *
 * @see EINA_INARRAY_REVERSE_FOREACH()
 *
 * @since 1.2
 */
EAPI void eina_inarray_reverse(Eina_Inarray *array) EINA_ARG_NONNULL(1);

/**
 * @brief Applies quick sort to array
 * @param array array object
 * @param compare compare function
 *
 * Applies quick sort to the @a array.
 *
 * The data given to @a compare function are the pointer to member
 * memory itself, do no change it.
 *
 * @see eina_inarray_insert_sorted()
 *
 * @since 1.2
 */
EAPI void eina_inarray_sort(Eina_Inarray *array,
                            Eina_Compare_Cb compare) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Search member (linear walk)
 * @param array array object
 * @param data member to search using @a compare function.
 * @param compare compare function
 * @return the member index or -1 if not found.
 *
 * Walks array linearly looking for given data as compared by
 * @a compare function.
 *
 * The data given to @a compare function are the pointer to member
 * memory itself, do no change it.
 *
 * See also eina_inarray_lookup_sorted().
 *
 * @since 1.2
 */
EAPI int eina_inarray_search(const Eina_Inarray *array,
                             const void *data,
                             Eina_Compare_Cb compare) EINA_ARG_NONNULL(1, 2, 3);

/**
 * @brief Search member (binary search walk)
 * @param array array object
 * @param data member to search using @a compare function.
 * @param compare compare function
 * @return the member index or @c -1 if not found.
 *
 * Uses binary search for given data as compared by @a compare function.
 *
 * The data given to @a compare function are the pointer to member
 * memory itself, do no change it.
 *
 * @since 1.2
 */
EAPI int eina_inarray_search_sorted(const Eina_Inarray *array,
                                    const void *data,
                                    Eina_Compare_Cb compare) EINA_ARG_NONNULL(1, 2, 3);

/**
 * @brief Call function for each array member
 * @param array array object
 * @param function callback function
 * @param user_data user data given to callback @a function
 * @return #EINA_TRUE if it successfully iterate all items of the array.
 *
 * Call @a function for every given data in @a array.
 *
 * Safe way to iterate over an array. @p function should return #EINA_TRUE
 * as long as you want the function to continue iterating, by
 * returning #EINA_FALSE it will stop and return #EINA_FALSE as a result.
 *
 * The data given to @a function are the pointer to member memory
 * itself.
 *
 * @see EINA_INARRAY_FOREACH()
 *
 * @since 1.2
 */
EAPI Eina_Bool eina_inarray_foreach(const Eina_Inarray *array,
                                    Eina_Each_Cb function,
                                    const void *user_data) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Remove all members that matched.
 * @param array array object
 * @param match match function
 * @param user_data user data given to callback @a match.
 * @return number of removed entries or -1 on error.
 *
 * Remove all entries in the @a array where @a match function
 * returns #EINA_TRUE.
 *
 * @since 1.2
 */
EAPI int eina_inarray_foreach_remove(Eina_Inarray *array,
                                     Eina_Each_Cb match,
                                     const void *user_data) EINA_ARG_NONNULL(1, 2);

/**
 * @brief number of members in array.
 * @param array array object
 * @return number of members in array.
 *
 * @since 1.2
 */
EAPI unsigned int eina_inarray_count(const Eina_Inarray *array) EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;

/**
 * @brief Returned a new iterator associated to an array.
 * @param array array object
 * @return A new iterator.
 *
 * This function returns a newly allocated iterator associated to
 * @p array.
 *
 * If the memory can not be allocated, @c NULL is returned.
 * Otherwise, a valid iterator is returned.
 *
 * @warning if the array structure changes then the iterator becomes
 *          invalid! That is, if you add or remove members this
 *          iterator behavior is undefined and your program may crash!
 *
 * @since 1.2
 */
EAPI Eina_Iterator *eina_inarray_iterator_new(const Eina_Inarray *array) EINA_MALLOC EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);

/**
 * @brief Returned a new reversed iterator associated to an array.
 * @param array array object
 * @return A new iterator.
 *
 * This function returns a newly allocated iterator associated to
 * @p array.
 *
 * Unlike eina_inarray_iterator_new(), this will walk the array backwards.
 *
 * If the memory can not be allocated, @c NULL is returned
 * Otherwise, a valid iterator is returned.
 *
 * @warning if the array 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!
 *
 * @since 1.2
 */
EAPI Eina_Iterator *eina_inarray_iterator_reversed_new(const Eina_Inarray *array) EINA_MALLOC EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);

/**
 * @brief Returned a new accessor associated to an array.
 * @param array array object
 * @return A new accessor.
 *
 * This function returns a newly allocated accessor associated to
 * @p array.
 *
 * If the memory can not be allocated, @c NULL is returned.
 * Otherwise, a valid accessor is returned.
 *
 * @since 1.2
 */
EAPI Eina_Accessor *eina_inarray_accessor_new(const Eina_Inarray *array) EINA_MALLOC EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);

/**
 * @def EINA_INARRAY_FOREACH
 * @brief walks array linearly from head to tail
 * @param array array object
 * @param itr the iterator pointer
 *
 * @a itr must be a pointer with sizeof(itr*) == array->member_size.
 *
 * @warning This is fast as it does direct pointer access, but it will
 *          not check for @c NULL pointers or invalid array object!
 *          See eina_inarray_foreach() to do that.
 *
 * @warning Do not modify array as you walk it! If that is desired,
 *          then use eina_inarray_foreach_remove()
 *
 * @since 1.2
 */
#define EINA_INARRAY_FOREACH(array, itr)                                \
  for ((itr) = (array)->members;					\
       (itr) < (((__typeof__(*itr)*)(array)->members) + (array)->len);	\
       (itr)++)

/**
 * @def EINA_INARRAY_REVERSE_FOREACH
 * @brief walks array linearly from tail to head
 * @param array array object
 * @param itr the iterator pointer
 *
 * @a itr must be a pointer with sizeof(itr*) == array->member_size.
 *
 * @warning This is fast as it does direct pointer access, but it will
 *          not check for @c NULL pointers or invalid array object!
 *
 * @warning Do not modify array as you walk it! If that is desired,
 *          then use eina_inarray_foreach_remove()
 *
 * @since 1.2
 */
#define EINA_INARRAY_REVERSE_FOREACH(array, itr)                        \
  for ((itr) = ((((__typeof__(*(itr))*)(array)->members) + (array)->len) - 1); \
       (((itr) >= (__typeof__(*(itr))*)(array)->members)		\
	&& ((array)->members != NULL));					\
       (itr)--)

/**
 * @}
 */

/**
 * @}
 */

/**
 * @}
 */

#endif /*EINA_INARRAY_H_*/