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    Bison 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 2, or (at your option)
   9    any later version.
  10
  11    Bison 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 Bison; see the file COPYING.  If not, write to
  18    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  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 unsigned int relation_node;
  33 typedef relation_node *relation_nodes;
  34 typedef relation_nodes *relation;
  35
  36
  37 /* Report a relation R that has SIZE vertices.  */
  38 void relation_print (relation r, size_t size, FILE *out);
  39
  40 /* Compute the transitive closure of the FUNCTION on the relation R
  41    with SIZE vertices.
  42
  43    If R (NODE-1, NODE-2) then on exit FUNCTION[NODE - 1] was extended
  44    (unioned) with FUNCTION[NODE - 2].  */
  45 void relation_digraph (relation r, size_t size, bitsetv *function);
  46
  47 /* Destructively transpose *R_ARG, of size N.  */
  48 void relation_transpose (relation *R_arg, int n);
  49
  50 #endif /* ! RELATION_H_ */