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[pf3gnuchains/gcc-fork.git] / include / splay-tree.h
1 /* A splay-tree datatype.  
2    Copyright 1998, 1999, 2000 Free Software Foundation, Inc.
3    Contributed by Mark Mitchell (mark@markmitchell.com).
4
5 This file is part of GNU CC.
6    
7 GNU CC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 GNU CC is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING.  If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA.  */
21
22 /* For an easily readable description of splay-trees, see:
23
24      Lewis, Harry R. and Denenberg, Larry.  Data Structures and Their
25      Algorithms.  Harper-Collins, Inc.  1991.  
26
27    The major feature of splay trees is that all basic tree operations
28    are amortized O(log n) time for a tree with n nodes.  */
29
30 #ifndef _SPLAY_TREE_H
31 #define _SPLAY_TREE_H
32
33 #ifdef __cplusplus
34 extern "C" {
35 #endif /* __cplusplus */
36
37 #include <ansidecl.h>
38
39 /* Use typedefs for the key and data types to facilitate changing
40    these types, if necessary.  These types should be sufficiently wide
41    that any pointer or scalar can be cast to these types, and then
42    cast back, without loss of precision.  */
43 typedef unsigned long int splay_tree_key;
44 typedef unsigned long int splay_tree_value;
45
46 /* Forward declaration for a node in the tree.  */
47 typedef struct splay_tree_node_s *splay_tree_node;
48
49 /* The type of a function which compares two splay-tree keys.  The
50    function should return values as for qsort.  */
51 typedef int (*splay_tree_compare_fn) PARAMS((splay_tree_key, splay_tree_key));
52
53 /* The type of a function used to deallocate any resources associated
54    with the key.  */
55 typedef void (*splay_tree_delete_key_fn) PARAMS((splay_tree_key));
56
57 /* The type of a function used to deallocate any resources associated
58    with the value.  */
59 typedef void (*splay_tree_delete_value_fn) PARAMS((splay_tree_value));
60
61 /* The type of a function used to iterate over the tree.  */
62 typedef int (*splay_tree_foreach_fn) PARAMS((splay_tree_node, void*));
63
64 /* The nodes in the splay tree.  */
65 struct splay_tree_node_s
66 {
67   /* The key.  */
68   splay_tree_key key;
69
70   /* The value.  */
71   splay_tree_value value;
72
73   /* The left and right children, respectively.  */
74   splay_tree_node left;
75   splay_tree_node right;
76 };
77
78 /* The splay tree itself.  */
79 typedef struct splay_tree_s
80 {
81   /* The root of the tree.  */
82   splay_tree_node root;
83
84   /* The comparision function.  */
85   splay_tree_compare_fn comp;
86
87   /* The deallocate-key function.  NULL if no cleanup is necessary.  */
88   splay_tree_delete_key_fn delete_key;
89
90   /* The deallocate-value function.  NULL if no cleanup is necessary.  */
91   splay_tree_delete_value_fn delete_value;
92 } *splay_tree;
93
94 extern splay_tree splay_tree_new        PARAMS((splay_tree_compare_fn,
95                                                 splay_tree_delete_key_fn,
96                                                 splay_tree_delete_value_fn));
97 extern void splay_tree_delete           PARAMS((splay_tree));
98 extern splay_tree_node splay_tree_insert          
99                                         PARAMS((splay_tree,
100                                                 splay_tree_key,
101                                                 splay_tree_value));
102 extern void splay_tree_remove           PARAMS((splay_tree,
103                                                 splay_tree_key));
104 extern splay_tree_node splay_tree_lookup   
105                                         PARAMS((splay_tree,
106                                                 splay_tree_key));
107 extern splay_tree_node splay_tree_predecessor
108                                         PARAMS((splay_tree,
109                                                 splay_tree_key));
110 extern splay_tree_node splay_tree_successor
111                                         PARAMS((splay_tree,
112                                                 splay_tree_key));
113 extern splay_tree_node splay_tree_max
114                                         PARAMS((splay_tree));
115 extern splay_tree_node splay_tree_min
116                                         PARAMS((splay_tree));
117 extern int splay_tree_foreach           PARAMS((splay_tree,
118                                                 splay_tree_foreach_fn,
119                                                 void*));
120 extern int splay_tree_compare_ints      PARAMS((splay_tree_key,
121                                                 splay_tree_key));
122 extern int splay_tree_compare_pointers  PARAMS((splay_tree_key,
123                                                 splay_tree_key));
124                                                
125 #ifdef __cplusplus
126 }
127 #endif /* __cplusplus */
128
129 #endif /* _SPLAY_TREE_H */