src/relation.h

   1 /* Binary relations.
   2
   3    Copyright (C) 2002, 2004, 2009-2015, 2018-2022 Free Software
   4    Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  20
  21
  22 #ifndef RELATION_H_
  23 # define RELATION_H_
  24
  25 /* Performing operations on graphs coded as list of adjacency.
  26
  27    If GRAPH is a relation, then GRAPH[Node] is a list of adjacent
  28    nodes, ended with END_NODE.  */
  29
  30 # define END_NODE ((relation_node) -1)
  31
  32 typedef size_t relation_node;
  33 typedef relation_node *relation_nodes;
  34 typedef relation_nodes *relation;
  35
  36 typedef void (relation_node_print) (relation_node node, FILE* out);
  37
  38 /* Report a relation R that has SIZE vertices.  */
  39 void relation_print (const char *title,
  40                      relation r, size_t size,
  41                      relation_node_print print, FILE *out);
  42
  43 /* Compute the transitive closure of the FUNCTION on the relation R
  44    with SIZE vertices.
  45
  46    If R (NODE1, NODE2) then on exit FUNCTION[NODE1] was extended
  47    (unioned) with FUNCTION[NODE2].
  48
  49    FUNCTION is in-out, R is read only.  */
  50 void relation_digraph (const relation r, relation_node size, bitsetv function);
  51
  52 /* Destructively transpose *R_ARG, of size SIZE.  */
  53 void relation_transpose (relation *R_arg, relation_node size);
  54
  55 #endif /* ! RELATION_H_ */