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| -rw-r--r-- | include/ChangeLog | 4 | ||||
| -rw-r--r-- | include/splay-tree.h | 116 |
2 files changed, 120 insertions, 0 deletions
diff --git a/include/ChangeLog b/include/ChangeLog index 923c79ed39a..1e395b1711c 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,7 @@ +1998-10-21 Mark Mitchell <mark@markmitchell.com> + + * splay-tree.h: New file. + Fri Oct 9 00:02:03 1998 Jeffrey A Law (law@cygnus.com) * Merge devo and egcs include directories. diff --git a/include/splay-tree.h b/include/splay-tree.h new file mode 100644 index 00000000000..0088106792d --- /dev/null +++ b/include/splay-tree.h @@ -0,0 +1,116 @@ +/* A splay-tree datatype. + Copyright (C) 1998 Free Software Foundation, Inc. + Contributed by Mark Mitchell (mark@markmitchell.com). + + This file is part of GNU CC. + + GNU CC 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 2, or (at your option) + any later version. + + GNU CC 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 GNU CC; see the file COPYING. If not, write to the Free + Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + + For an easily readable description of splay-trees, see: + + Lewis, Harry R. and Denenberg, Larry. Data Structures and Their + Algorithms. Harper-Collins, Inc. 1991. + + The major feature of splay trees is that all basic tree operations + are amortized O(log n) time for a tree with n nodes. */ + +#ifndef _SPLAY_TREE_H +#define _SPLAY_TREE_H + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +#ifdef IN_GCC +#include "gansidecl.h" +#define PARAMS(ARGS) PROTO(ARGS) +#else /* ! IN_GCC */ +#include <ansidecl.h> +#endif /* IN_GCC */ + +/* Use typedefs for the key and data types to facilitate changing + these types, if necessary. These types should be sufficiently wide + that any pointer or scalar can be cast to these types, and then + cast back, without loss of precision. */ +typedef unsigned long int splay_tree_key; +typedef unsigned long int splay_tree_value; + +/* Forward declaration for a node in the tree. */ +typedef struct splay_tree_node *splay_tree_node; + +/* The type of a function which compares two splay-tree keys. The + function should return values as for qsort. */ +typedef int (*splay_tree_compare_fn)(splay_tree_key, splay_tree_key); + +/* The type of a function used to deallocate any resources associated + with the key. */ +typedef void (*splay_tree_delete_key_fn)(splay_tree_key); + +/* The type of a function used to deallocate any resources associated + with the value. */ +typedef void (*splay_tree_delete_value_fn)(splay_tree_value); + +/* The type of a function used to iterate over the tree. */ +typedef int (*splay_tree_foreach_fn)(splay_tree_node, void*); + +/* The nodes in the splay tree. */ +struct splay_tree_node +{ + /* The key. */ + splay_tree_key key; + + /* The value. */ + splay_tree_value value; + + /* The left and right children, respectively. */ + splay_tree_node left; + splay_tree_node right; +}; + +/* The splay tree itself. */ +typedef struct splay_tree +{ + /* The root of the tree. */ + splay_tree_node root; + + /* The comparision function. */ + splay_tree_compare_fn comp; + + /* The deallocate-key function. NULL if no cleanup is necessary. */ + splay_tree_delete_key_fn delete_key; + + /* The deallocate-value function. NULL if no cleanup is necessary. */ + splay_tree_delete_value_fn delete_value; +} *splay_tree; + +extern splay_tree splay_tree_new PARAMS((splay_tree_compare_fn, + splay_tree_delete_key_fn, + splay_tree_delete_value_fn)); +extern void splay_tree_delete PARAMS((splay_tree)); +extern void splay_tree_insert PARAMS((splay_tree, + splay_tree_key, + splay_tree_value)); +extern splay_tree_node splay_tree_lookup + PARAMS((splay_tree, + splay_tree_key)); +extern int splay_tree_foreach PARAMS((splay_tree, + splay_tree_foreach_fn, + void*)); + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* _SPLAY_TREE_H */ |