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/* Sequential list data type implemented by a binary tree.
Copyright (C) 2006, 2009-2020 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Common code of gl_avltree_list.c, gl_rbtree_list.c,
gl_avltreehash_list.c, gl_rbtreehash_list.c. */
/* An item on the stack used for iterating across the elements. */
typedef struct
{
gl_list_node_t node;
size_t rightp;
} iterstack_item_t;
/* A stack used for iterating across the elements. */
typedef iterstack_item_t iterstack_t[MAXHEIGHT];
/* Frees a non-empty subtree recursively.
This function is recursive and therefore not very fast. */
static void
free_subtree (gl_list_node_t node)
{
if (node->left != NULL)
free_subtree (node->left);
if (node->right != NULL)
free_subtree (node->right);
free (node);
}
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