precede.cpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christopher Mears <Chris.Mears@monash.edu>
 *
 *  Contributing authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christopher Mears, 2011
 *     Christian Schulte, 2011
 *
 *  Last modified:
 *     $Date: 2016-05-23 22:18:23 +0200 (Mon, 23 May 2016) $ by $Author: schulte $
 *     $Revision: 15073 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
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 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
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 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
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 */

#include <gecode/int/precede.hh>

namespace Gecode {

  void
  precede(Home home, const IntVarArgs& x, int s, int t, IntPropLevel) {
    using namespace Int;
    Limits::check(s,"Int::precede");
    Limits::check(t,"Int::precede");
    GECODE_POST;

    ViewArray<IntView> y(home, x);
    GECODE_ES_FAIL(Precede::Single<IntView>::post(home, y, s, t));
  }

  void
  precede(Home home, const IntVarArgs& x, const IntArgs& c, IntPropLevel) {
    using namespace Int;
    if (c.size() < 2)
      return;
    for (int i=c.size(); i--; )
      Limits::check(c[i],"Int::precede");
    GECODE_POST;

    for (int i=c.size()-1; i--; ) {
      ViewArray<IntView> y(home, x);
      GECODE_ES_FAIL(Precede::Single<IntView>::post(home, y, c[i], c[i+1]));
    }
  }

}

// STATISTICS: int-post