src/relation.h

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