eq.hpp

Go to the documentation of this file.

/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.org>
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Contributing authors:
 *     Gabor Szokoli <szokoli@gecode.org>
 *
 *  Copyright:
 *     Guido Tack, 2004
 *     Christian Schulte, 2004
 *     Gabor Szokoli, 2004
 *
 *  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 {

  template<class View0, class View1>
  forceinline
  Eq<View0,View1>::Eq(Home home, View0 x, View1 y)
    : MixBinaryPropagator<View0,PC_SET_ANY,View1,PC_SET_ANY>(home,x,y) {}

  template<class View0, class View1>
  forceinline
  Eq<View0,View1>::Eq(Space& home, Eq& p)
    : MixBinaryPropagator<View0,PC_SET_ANY,View1,PC_SET_ANY>(home,p) {}

  template<class View0, class View1>
  ExecStatus
  Eq<View0,View1>::post(Home home, View0 x, View1 y) {
    if (!same(x,y))
      (void) new (home) Eq(home,x,y);
    return ES_OK;
  }

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

  template<class View0, class View1>
  ExecStatus
  Eq<View0,View1>::propagate(Space& home, const ModEventDelta& med) {

    ModEvent me0 = View0::me(med);
    ModEvent me1 = View1::me(med);

    Region r;

    if (testSetEventLB(me0,me1)) {
      GlbRanges<View0> x0lb(x0);
      GlbRanges<View1> x1lb(x1);
      Iter::Ranges::Union<GlbRanges<View0>,GlbRanges<View1> > lbu(x0lb,x1lb);
      Iter::Ranges::Cache lbuc(r,lbu);
      GECODE_ME_CHECK(x0.includeI(home,lbuc));
      lbuc.reset();
      GECODE_ME_CHECK(x1.includeI(home,lbuc));
    }

    if (testSetEventUB(me0,me1)) {
      LubRanges<View0> x0ub(x0);
      LubRanges<View1> x1ub(x1);
      Iter::Ranges::Inter<LubRanges<View0>,LubRanges<View1> > ubi(x0ub,x1ub);
      Iter::Ranges::Cache ubic(r,ubi);
      GECODE_ME_CHECK(x0.intersectI(home,ubic));
      ubic.reset();
      GECODE_ME_CHECK(x1.intersectI(home,ubic));
    }

    if (testSetEventCard(me0,me1)) {
      unsigned int max = std::min(x0.cardMax(),x1.cardMax());
      unsigned int min = std::max(x0.cardMin(),x1.cardMin());
      GECODE_ME_CHECK(x0.cardMax(home,max));
      GECODE_ME_CHECK(x1.cardMax(home,max));
      GECODE_ME_CHECK(x0.cardMin(home,min));
      GECODE_ME_CHECK(x1.cardMin(home,min));
    }

    if (x0.assigned()) {
      assert (x1.assigned());
      return home.ES_SUBSUMED(*this);
    }
    return shared(x0,x1) ? ES_NOFIX : ES_FIX;
  }

}}}

// STATISTICS: set-prop