| /* 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. */ | |
| extern "C" { | |
| struct partition_elem | |
| { | |
| /* The next element in this class. Elements in each class form a | |
| circular list. */ | |
| struct partition_elem* next; | |
| /* The canonical element that represents the class containing this | |
| element. */ | |
| int class_element; | |
| /* 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__. */ | |
| } | |