/* Test Polyhedron::poly_difference_assign().
   Copyright (C) 2001-2004 Roberto Bagnara <bagnara@cs.unipr.it>

This file is part of the Parma Polyhedra Library (PPL).

The PPL 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 2 of the License, or (at your
option) any later version.

The PPL 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.

For the most up-to-date information see the Parma Polyhedra Library
site: http://www.cs.unipr.it/ppl/ . */

#include "ppl_test.hh"

using namespace std;
using namespace Parma_Polyhedra_Library;

#ifndef NOISY
#define NOISY 0
#endif

int
main() TRY {
  set_handlers();
  
  Variable x(0);
  Variable y(1);

  ConSys cs1;
  cs1.insert(x >= 0);
  cs1.insert(y >= 0);
  cs1.insert(x <= 4);
  cs1.insert(x - 2*y <= 2);

  C_Polyhedron ph1(cs1);

#if NOISY
  print_constraints(ph1, "*** ph1 ***");
#endif

  ConSys cs2;
  cs2.insert(x >= 0);
  cs2.insert(y >= 0);
  cs2.insert(x <= 4);
  cs2.insert(y <= 5);
  cs2.insert(x - 2*y <= 2);
  cs2.insert(x + y <= 7);

  C_Polyhedron ph2(cs2);

#if NOISY
  print_constraints(ph2, "*** ph2 ***");
#endif

  C_Polyhedron computed_result = ph1;
  computed_result.poly_difference_assign(ph2);

  GenSys gs_known_result;
  gs_known_result.insert(point(0*x + 5*y));
  gs_known_result.insert(point(4*x + 3*y));
  gs_known_result.insert(ray(0*x + 1*y));

  C_Polyhedron known_result(gs_known_result);

  int retval = (computed_result == known_result) ? 0 : 1;

#if NOISY
  print_constraints(computed_result, "*** After poly_difference_assign ***");
  print_constraints(known_result, "*** known_result ***");
#endif

  return retval;
}
CATCH