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-/* 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 */