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118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/* A splay-tree datatype.
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Copyright (C) 1998 Free Software Foundation, Inc.
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Contributed by Mark Mitchell (mark@markmitchell.com).
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* For an easily readable description of splay-trees, see:
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Lewis, Harry R. and Denenberg, Larry. Data Structures and Their
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Algorithms. Harper-Collins, Inc. 1991.
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The major feature of splay trees is that all basic tree operations
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are amortized O(log n) time for a tree with n nodes. */
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#ifndef _SPLAY_TREE_H
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#define _SPLAY_TREE_H
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#include <ansidecl.h>
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/* Use typedefs for the key and data types to facilitate changing
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these types, if necessary. These types should be sufficiently wide
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that any pointer or scalar can be cast to these types, and then
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cast back, without loss of precision. */
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typedef unsigned long int splay_tree_key;
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typedef unsigned long int splay_tree_value;
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/* Forward declaration for a node in the tree. */
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typedef struct splay_tree_node *splay_tree_node;
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/* The type of a function which compares two splay-tree keys. The
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function should return values as for qsort. */
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typedef int (*splay_tree_compare_fn) PARAMS((splay_tree_key, splay_tree_key));
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/* The type of a function used to deallocate any resources associated
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with the key. */
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typedef void (*splay_tree_delete_key_fn) PARAMS((splay_tree_key));
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/* The type of a function used to deallocate any resources associated
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with the value. */
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typedef void (*splay_tree_delete_value_fn) PARAMS((splay_tree_value));
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/* The type of a function used to iterate over the tree. */
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typedef int (*splay_tree_foreach_fn) PARAMS((splay_tree_node, void*));
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/* The nodes in the splay tree. */
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struct splay_tree_node
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{
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/* The key. */
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splay_tree_key key;
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/* The value. */
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splay_tree_value value;
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/* The left and right children, respectively. */
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splay_tree_node left;
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splay_tree_node right;
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};
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/* The splay tree itself. */
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typedef struct splay_tree
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{
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/* The root of the tree. */
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splay_tree_node root;
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/* The comparision function. */
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splay_tree_compare_fn comp;
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/* The deallocate-key function. NULL if no cleanup is necessary. */
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splay_tree_delete_key_fn delete_key;
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/* The deallocate-value function. NULL if no cleanup is necessary. */
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splay_tree_delete_value_fn delete_value;
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} *splay_tree;
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extern splay_tree splay_tree_new PARAMS((splay_tree_compare_fn,
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splay_tree_delete_key_fn,
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splay_tree_delete_value_fn));
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extern void splay_tree_delete PARAMS((splay_tree));
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extern splay_tree_node splay_tree_insert
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PARAMS((splay_tree,
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splay_tree_key,
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splay_tree_value));
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extern splay_tree_node splay_tree_lookup
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PARAMS((splay_tree,
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splay_tree_key));
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extern int splay_tree_foreach PARAMS((splay_tree,
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splay_tree_foreach_fn,
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void*));
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extern int splay_tree_compare_ints PARAMS((splay_tree_key,
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splay_tree_key));
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extern int splay_tree_compare_pointers PARAMS((splay_tree_key,
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splay_tree_key));
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* _SPLAY_TREE_H */
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