wl_array(3)

NAME
wl_array

SYNOPSIS

#include <wayland-util.h>

  Public Member Functions
void wl_array_init (struct wl_array *array)
void wl_array_release (struct wl_array *array)
void * wl_array_add (struct wl_array *array, size_t size)
int wl_array_copy (struct wl_array *array, struct wl_array *source)

  Data Fields
size_t size
size_t alloc
void * data

  Related Symbols
(Note that these are not member symbols.)
#define wl_array_for_each(pos, array)

Detailed Description

Dynamic array

A wl_array is a dynamic array that can only grow until released. It is intended for relatively small allocations whose size is variable or not known in advance. While construction of a wl_array does not require all elements to be of the same size, wl_array_for_each() does require all elements to have the same type and size.

Member Function Documentation

  void * wl_array_add (struct wl_array * array, size_t size)
Increases the size of the array by size bytes.

Parameters
    array Array whose size is to be increased
    size Number of bytes to increase the size of the array by

Returns
    A pointer to the beginning of the newly appended space, or NULL when resizing fails.

  int wl_array_copy (struct wl_array * array, struct wl_array * source)
Copies the contents of source to array.

Parameters
    array Destination array to copy to
    source Source array to copy from

Returns
    0 on success, or -1 on failure

  void wl_array_init (struct wl_array * array)
Initializes the array.

Parameters
    array Array to initialize

  void wl_array_release (struct wl_array * array)
Releases the array data.

Note
    Leaves the array in an invalid state.

Parameters
    array Array whose data is to be released

Friends And Related Symbol Documentation

  #define wl_array_for_each( pos, array) [related]
Value:
for (pos = (array)->data;                                       \
     (array)->size != 0 &&                                      \
     (const char *) pos < ((const char *) (array)->data + (array)->size); \
     (pos)++)

Iterates over an array.

This macro expresses a for-each iterator for wl_array. It assigns each element in the array to pos, which can then be referenced in a trailing code block. pos must be a pointer to the array element type, and all array elements must be of the same type and size.

Parameters
    pos Cursor that each array element will be assigned to
    array Array to iterate over

See also
    wl_list_for_each()

Field Documentation

  size_t wl_array::alloc
Allocated space

  void* wl_array::data
Array data

  size_t wl_array::size
Array size

Author

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