wl_list(3)

NAME
wl_list - doubly-linked list

SYNOPSIS

#include <wayland-util.h>

  Public Attributes
struct wl_list * prev
struct wl_list * next

Detailed Description

doubly-linked list The list head is of 'struct wl_list' type, and must be initialized using wl_list_init(). All entries in the list must be of the same type. The item type must have a 'struct wl_list' member. This member will be initialized by wl_list_insert(). There is no need to call wl_list_init() on the individual item. To query if the list is empty in O(1), use wl_list_empty().

Let's call the list reference 'struct wl_list foo_list', the item type as 'item_t', and the item member as 'struct wl_list link'.

The following code will initialize a list:

struct wl_list foo_list;
struct item_t {
        int foo;
        struct wl_list link;
};
struct item_t item1, item2, item3;
wl_list_init(&foo_list);
wl_list_insert(&foo_list, &item1.link); // Pushes item1 at the head
wl_list_insert(&foo_list, &item2.link); // Pushes item2 at the head
wl_list_insert(&item2.link, &item3.link);       // Pushes item3 after item2

The list now looks like [item2, item3, item1]

Iterate the list in ascending order:

item_t *item;
wl_list_for_each(item, foo_list, link) {
        Do_something_with_item(item);
}

Author

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