*
* The following copying information applies to this specific source code file:
*
- * Written in 2014 by Eric Biggers <ebiggers3@gmail.com>
+ * Written in 2014-2016 by Eric Biggers <ebiggers3@gmail.com>
*
* To the extent possible under law, the author(s) have dedicated all copyright
* and related and neighboring rights to this software to the public domain
#ifndef _AVL_TREE_H_
#define _AVL_TREE_H_
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h> /* for uintptr_t */
-
-#ifdef __GNUC__
-# define AVL_INLINE inline __attribute__((always_inline))
-#else
-# define AVL_INLINE inline
-# warning "AVL tree functions may not be inlined as intended"
-#endif
+#include "wimlib/types.h"
+#define AVL_INLINE forceinline
/* Node in an AVL tree. Embed this in some other data structure. */
struct avl_tree_node {
return (struct avl_tree_node *)(node->parent_balance & ~3);
}
-/* Marks the specified AVL tree node as unlinked from any tree. */
-static AVL_INLINE void
-avl_tree_node_set_unlinked(struct avl_tree_node *node)
-{
- node->parent_balance = (uintptr_t)node;
-}
-
-/* Returns true iff the specified AVL tree node has been marked with
- * avl_tree_node_set_unlinked() and has not subsequently been inserted into a
- * tree. */
-static AVL_INLINE bool
-avl_tree_node_is_unlinked(const struct avl_tree_node *node)
-{
- return node->parent_balance == (uintptr_t)node;
-}
-
/* (Internal use only) */
extern void
avl_tree_rebalance_after_insert(struct avl_tree_node **root_ptr,
avl_tree_first_in_order(const struct avl_tree_node *root);
extern struct avl_tree_node *
-avl_tree_next_in_order(const struct avl_tree_node *prev);
+avl_tree_last_in_order(const struct avl_tree_node *root);
+
+extern struct avl_tree_node *
+avl_tree_next_in_order(const struct avl_tree_node *node);
+
+extern struct avl_tree_node *
+avl_tree_prev_in_order(const struct avl_tree_node *node);
extern struct avl_tree_node *
avl_tree_first_in_postorder(const struct avl_tree_node *root);
struct_member), 1); \
_cur = avl_tree_next_in_order(_cur))
+/*
+ * Like avl_tree_for_each_in_order(), but uses the reverse order.
+ */
+#define avl_tree_for_each_in_reverse_order(child_struct, root, \
+ struct_name, struct_member) \
+ for (struct avl_tree_node *_cur = \
+ avl_tree_last_in_order(root); \
+ _cur && ((child_struct) = \
+ avl_tree_entry(_cur, struct_name, \
+ struct_member), 1); \
+ _cur = avl_tree_prev_in_order(_cur))
+
/*
* Like avl_tree_for_each_in_order(), but iterates through the nodes in
* postorder, so the current node may be deleted or freed.