tsort.h

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/* tsort - topological sort.
   Copyright (C) 1998-2013 Free Software Foundation, Inc.

   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 <http://www.gnu.org/licenses/>.  */

/* Written by Mark Kettenis <kettenis@phys.uva.nl>.  */

/* The topological sort is done according to Algorithm T (Topological
   sort) in Donald E. Knuth, The Art of Computer Programming, Volume
   1/Fundamental Algorithms, page 262.  */

void add_relation(unsigned long id1, unsigned long id2);
int tsort (void);
unsigned long* get_sorted_ids(void);