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/* A splay-tree datatype.
Copyright 1998, 1999, 2000 Free Software Foundation, Inc.
Contributed by Mark Mitchell (mark@markmitchell.com).
This file is part of GCC.
GCC 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.
GCC 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 GCC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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 */
#include <ansidecl.h>
/* 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_s *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) PARAMS((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) PARAMS((splay_tree_key));
/* The type of a function used to deallocate any resources associated
with the value. */
typedef void (*splay_tree_delete_value_fn) PARAMS((splay_tree_value));
/* The type of a function used to iterate over the tree. */
typedef int (*splay_tree_foreach_fn) PARAMS((splay_tree_node, void*));
/* The type of a function used to allocate memory for tree root and
node structures. The first argument is the number of bytes needed;
the second is a data pointer the splay tree functions pass through
to the allocator. This function must never return zero. */
typedef void *(*splay_tree_allocate_fn) PARAMS((int, void *));
/* The type of a function used to free memory allocated using the
corresponding splay_tree_allocate_fn. The first argument is the
memory to be freed; the latter is a data pointer the splay tree
functions pass through to the freer. */
typedef void (*splay_tree_deallocate_fn) PARAMS((void *, void *));
/* The nodes in the splay tree. */
struct splay_tree_node_s
{
/* 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_s
{
/* 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;
/* Allocate/free functions, and a data pointer to pass to them. */
splay_tree_allocate_fn allocate;
splay_tree_deallocate_fn deallocate;
void *allocate_data;
} *splay_tree;
extern splay_tree splay_tree_new PARAMS((splay_tree_compare_fn,
splay_tree_delete_key_fn,
splay_tree_delete_value_fn));
extern splay_tree splay_tree_new_with_allocator
PARAMS((splay_tree_compare_fn,
splay_tree_delete_key_fn,
splay_tree_delete_value_fn,
splay_tree_allocate_fn,
splay_tree_deallocate_fn,
void *));
extern void splay_tree_delete PARAMS((splay_tree));
extern splay_tree_node splay_tree_insert
PARAMS((splay_tree,
splay_tree_key,
splay_tree_value));
extern void splay_tree_remove PARAMS((splay_tree,
splay_tree_key));
extern splay_tree_node splay_tree_lookup
PARAMS((splay_tree,
splay_tree_key));
extern splay_tree_node splay_tree_predecessor
PARAMS((splay_tree,
splay_tree_key));
extern splay_tree_node splay_tree_successor
PARAMS((splay_tree,
splay_tree_key));
extern splay_tree_node splay_tree_max
PARAMS((splay_tree));
extern splay_tree_node splay_tree_min
PARAMS((splay_tree));
extern int splay_tree_foreach PARAMS((splay_tree,
splay_tree_foreach_fn,
void*));
extern int splay_tree_compare_ints PARAMS((splay_tree_key,
splay_tree_key));
extern int splay_tree_compare_pointers PARAMS((splay_tree_key,
splay_tree_key));
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _SPLAY_TREE_H */
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