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/* Binary relations.
Copyright (C) 2002, 2004, 2009-2015, 2018-2021 Free Software
Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef RELATION_H_
# define RELATION_H_
/* Performing operations on graphs coded as list of adjacency.
If GRAPH is a relation, then GRAPH[Node] is a list of adjacent
nodes, ended with END_NODE. */
# define END_NODE ((relation_node) -1)
typedef size_t relation_node;
typedef relation_node *relation_nodes;
typedef relation_nodes *relation;
typedef void (relation_node_print) (relation_node node, FILE* out);
/* Report a relation R that has SIZE vertices. */
void relation_print (const char *title,
relation r, size_t size,
relation_node_print print, FILE *out);
/* Compute the transitive closure of the FUNCTION on the relation R
with SIZE vertices.
If R (NODE1, NODE2) then on exit FUNCTION[NODE1] was extended
(unioned) with FUNCTION[NODE2].
FUNCTION is in-out, R is read only. */
void relation_digraph (const relation r, relation_node size, bitsetv function);
/* Destructively transpose *R_ARG, of size SIZE. */
void relation_transpose (relation *R_arg, relation_node size);
#endif /* ! RELATION_H_ */
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