nosubset.icc

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.org>
 *     Christian Schulte <schulte@gecode.org>
 *     Gabor Szokoli <szokoli@gecode.org>
 *
 *  Copyright:
 *     Guido Tack, 2004
 *     Christian Schulte, 2004
 *     Gabor Szokoli, 2004
 *
 *  Last modified:
 *     $Date: 2008-01-31 18:29:16 +0100 (Thu, 31 Jan 2008) $ by $Author: tack $
 *     $Revision: 6017 $
 *
 *  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
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

namespace Gecode { namespace Set { namespace Rel {

  /*
   * "No Subset" propagator
   *
   */

  template <class View0, class View1>
  forceinline
  NoSubSet<View0,View1>::NoSubSet(Space* home, View0 y0, View1 y1)
    : MixBinaryPropagator<View0,PC_SET_CLUB,
                            View1,PC_SET_CGLB>(home,y0,y1) {}

  template <class View0, class View1>
  forceinline
  NoSubSet<View0,View1>::NoSubSet(Space* home, bool share, 
                                  NoSubSet<View0,View1>& p)
    : MixBinaryPropagator<View0,PC_SET_CLUB,
                            View1,PC_SET_CGLB>(home,share,p) {}

  template <class View0, class View1>
  ExecStatus
  NoSubSet<View0,View1>::post(Space* home, View0 x, View1 y) {
    if (me_failed(x.cardMin(home,1)))
      return ES_FAILED;
    (void) new (home) NoSubSet<View0,View1>(home,x,y);
    return ES_OK;
  }

  template <class View0, class View1>
  Actor*
  NoSubSet<View0,View1>::copy(Space* home, bool share) {
    return new (home) NoSubSet<View0,View1>(home,share,*this);
  }

  template <class View0, class View1>
  Support::Symbol
  NoSubSet<View0,View1>::ati(void) {
    return Reflection::mangle<View0,View1>("Gecode::Set::Rel::NoSubSet");
  }

  template <class View0, class View1>
  Reflection::ActorSpec
  NoSubSet<View0,View1>::spec(const Space* home,
                              Reflection::VarMap& m) const {
    return MixBinaryPropagator<View0,PC_SET_CLUB,View1,PC_SET_CGLB>
      ::spec(home, m, ati());
  }

  template <class View0, class View1>
  void
  NoSubSet<View0,View1>::post(Space* home, Reflection::VarMap& vars,
                              const Reflection::ActorSpec& spec) {
    spec.checkArity(2);
    View0 x0(home, vars, spec[0]);
    View1 x1(home, vars, spec[1]);
    (void) new (home) NoSubSet(home,x0,x1);
  }

  template <class View0, class View1>
  ExecStatus
  NoSubSet<View0,View1>::propagate(Space* home, ModEventDelta) {
    GlbRanges<View0> x0lb(x0);
    LubRanges<View1> x1ub(x1);
    if (!Iter::Ranges::subset(x0lb, x1ub))
      return ES_SUBSUMED(this,home);
    if (x0.cardMin()>x1.cardMax()) { return ES_SUBSUMED(this,home); }
    LubRanges<View0> x0ub(x0);
    GlbRanges<View1> x1lb(x1);
    Iter::Ranges::Diff<LubRanges<View0>,GlbRanges<View1> >
      breakers(x0ub,x1lb);
    if (!breakers()) { return ES_FAILED; }
    if (breakers.min() == breakers.max()) {
      int b1 = breakers.min();
      ++breakers;
      if (breakers()) { return ES_FIX; }
      //Only one subsetness-breaker element left:
      GECODE_ME_CHECK( x0.include(home,b1) );
      GECODE_ME_CHECK( x1.exclude(home,b1) );
      return ES_SUBSUMED(this,home);
    }
    return ES_FIX;
  }

}}}

// STATISTICS: set-prop