mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-11 03:52:59 +00:00
83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
|
/* List implementation of a partition of consecutive integers.
|
||
|
|
Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
|
||
|
|
Contributed by CodeSourcery, LLC.
|
||
|
|
|
||
|
|
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, 51 Franklin Street - Fifth Floor,
|
||
|
|
Boston, MA 02110-1301, USA. */
|
||
|
|
|
||
|
|
/* This package implements a partition of consecutive integers. The
|
||
|
|
elements are partitioned into classes. Each class is represented
|
||
|
|
by one of its elements, the canonical element, which is chosen
|
||
|
|
arbitrarily from elements in the class. The principal operations
|
||
|
|
on a partition are FIND, which takes an element, determines its
|
||
|
|
class, and returns the canonical element for that class, and UNION,
|
||
|
|
which unites the two classes that contain two given elements into a
|
||
|
|
single class.
|
||
|
|
|
||
|
|
The list implementation used here provides constant-time finds. By
|
||
|
|
storing the size of each class with the class's canonical element,
|
||
|
|
it is able to perform unions over all the classes in the partition
|
||
|
|
in O (N log N) time. */
|
||
|
|
|
||
|
|
#ifndef _PARTITION_H
|
||
|
|
#define _PARTITION_H
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif /* __cplusplus */
|
||
|
|
|
||
|
|
#include "ansidecl.h"
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
struct partition_elem
|
||
|
|
{
|
||
|
|
/* The canonical element that represents the class containing this
|
||
|
|
element. */
|
||
|
|
int class_element;
|
||
|
|
/* The next element in this class. Elements in each class form a
|
||
|
|
circular list. */
|
||
|
|
struct partition_elem* next;
|
||
|
|
/* The number of elements in this class. Valid only if this is the
|
||
|
|
canonical element for its class. */
|
||
|
|
unsigned class_count;
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef struct partition_def
|
||
|
|
{
|
||
|
|
/* The number of elements in this partition. */
|
||
|
|
int num_elements;
|
||
|
|
/* The elements in the partition. */
|
||
|
|
struct partition_elem elements[1];
|
||
|
|
} *partition;
|
||
|
|
|
||
|
|
extern partition partition_new (int);
|
||
|
|
extern void partition_delete (partition);
|
||
|
|
extern int partition_union (partition, int, int);
|
||
|
|
extern void partition_print (partition, FILE*);
|
||
|
|
|
||
|
|
/* Returns the canonical element corresponding to the class containing
|
||
|
|
ELEMENT__ in PARTITION__. */
|
||
|
|
|
||
|
|
#define partition_find(partition__, element__) \
|
||
|
|
((partition__)->elements[(element__)].class_element)
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif /* __cplusplus */
|
||
|
|
|
||
|
|
#endif /* _PARTITION_H */
|