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} cairo_list_t;

#define cairo_list_entry(ptr, type, member) \

	cairo_container_of(ptr, type, member)

#define cairo_list_first_entry(ptr, type, member) \

	cairo_list_entry((ptr)->next, type, member)

#define cairo_list_last_entry(ptr, type, member) \

	cairo_list_entry((ptr)->prev, type, member)

#define cairo_list_foreach(pos, head)			\

	for (pos = (head)->next; pos != (head);	pos = pos->next)

#define cairo_list_foreach_entry(pos, type, head, member)		\

	for (pos = cairo_list_entry((head)->next, type, member);\

	     &pos->member != (head);					\

	     pos = cairo_list_entry(pos->member.next, type, member))

#define cairo_list_foreach_entry_safe(pos, n, type, head, member)	\

	for (pos = cairo_list_entry ((head)->next, type, member),\

	     n = cairo_list_entry (pos->member.next, type, member);\

	     &pos->member != (head);					\

	     pos = n, n = cairo_list_entry (n->member.next, type, member))

#define cairo_list_foreach_entry_reverse(pos, type, head, member)	\

	for (pos = cairo_list_entry((head)->prev, type, member);\

	     &pos->member != (head);					\

	     pos = cairo_list_entry(pos->member.prev, type, member))

#define cairo_list_foreach_entry_reverse_safe(pos, n, type, head, member)	\

	for (pos = cairo_list_entry((head)->prev, type, member),\

	     n = cairo_list_entry (pos->member.prev, type, member);\

	     &pos->member != (head);					\

	     pos = n, n = cairo_list_entry (n->member.prev, type, member))

#ifdef CAIRO_LIST_DEBUG

static inline void

_cairo_list_validate (const cairo_list_t *link)

{

    assert (link->next->prev == link);

    assert (link->prev->next == link);

}

static inline void

cairo_list_validate (const cairo_list_t *head)

{

    cairo_list_t *link;

    cairo_list_foreach (link, head)

	_cairo_list_validate (link);

}

static inline cairo_bool_t

cairo_list_is_empty (const cairo_list_t *head);

static inline void

cairo_list_validate_is_empty (const cairo_list_t *head)

{

    assert (head->next == NULL || (cairo_list_is_empty (head) && head->next == head->prev));

}

#else

#define _cairo_list_validate(link)

#define cairo_list_validate(head)

#define cairo_list_validate_is_empty(head)

#endif

static inline void

cairo_list_init (cairo_list_t *entry)

{

    entry->next = entry;

    entry->prev = entry;

}

static inline void

__cairo_list_add (cairo_list_t *entry,

	          cairo_list_t *prev,

		  cairo_list_t *next)

{

    next->prev = entry;

    entry->next = next;

    entry->prev = prev;

    prev->next = entry;

}

static inline void

cairo_list_add (cairo_list_t *entry, cairo_list_t *head)

{

    cairo_list_validate (head);

    cairo_list_validate_is_empty (entry);

    __cairo_list_add (entry, head, head->next);

    cairo_list_validate (head);

}

static inline void

cairo_list_add_tail (cairo_list_t *entry, cairo_list_t *head)

{

    cairo_list_validate (head);

    cairo_list_validate_is_empty (entry);

    __cairo_list_add (entry, head->prev, head);

    cairo_list_validate (head);

}

static inline void

__cairo_list_del (cairo_list_t *prev, cairo_list_t *next)

{

    next->prev = prev;

    prev->next = next;

}

static inline void

cairo_list_del (cairo_list_t *entry)

{

    __cairo_list_del (entry->prev, entry->next);

    cairo_list_init (entry);

}

static inline void

cairo_list_move (cairo_list_t *entry, cairo_list_t *head)

{

    cairo_list_validate (head);

    __cairo_list_del (entry->prev, entry->next);

    __cairo_list_add (entry, head, head->next);

    cairo_list_validate (head);

}

static inline void

cairo_list_move_tail (cairo_list_t *entry, cairo_list_t *head)

{

    cairo_list_validate (head);

    __cairo_list_del (entry->prev, entry->next);

    __cairo_list_add (entry, head->prev, head);

    cairo_list_validate (head);

}

static inline void

cairo_list_swap (cairo_list_t *entry, cairo_list_t *other)

{

    __cairo_list_add (entry, other->prev, other->next);

    cairo_list_init (other);

}

static inline cairo_bool_t

cairo_list_is_first (const cairo_list_t *entry,

	             const cairo_list_t *head)

{

    cairo_list_validate (head);

    return entry->prev == head;

}

static inline cairo_bool_t

cairo_list_is_last (const cairo_list_t *entry,

	            const cairo_list_t *head)

{

    cairo_list_validate (head);

    return entry->next == head;

}

static inline cairo_bool_t

cairo_list_is_empty (const cairo_list_t *head)

{

    cairo_list_validate (head);

    return head->next == head;

}

static inline cairo_bool_t

cairo_list_is_singular (const cairo_list_t *head)

{

    cairo_list_validate (head);

    return head->next == head || head->next == head->prev;