nq.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>
 *
 *  Contributing authors:
 *     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 {

  template <class View0, class View1>
  forceinline
  Distinct<View0,View1>::Distinct(Space* home, View0 x, View1 y)
    : MixBinaryPropagator<View0, PC_SET_VAL, View1, PC_SET_VAL>(home,x,y) {}

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

  template <class View0, class View1>
  ExecStatus
  Distinct<View0,View1>::post(Space* home, View0 x, View1 y) {
    if (x.assigned()) {
      GlbRanges<View0> xr(x);
      IntSet xs(xr);
      ConstantView cv(home, xs);
      GECODE_ES_CHECK((DistinctDoit<View1>::post(home,y,cv)));
    }
    if (y.assigned()) {
      GlbRanges<View1> yr(y);
      IntSet ys(yr);
      ConstantView cv(home, ys);
      GECODE_ES_CHECK((DistinctDoit<View0>::post(home,x,cv)));
    }
    (void) new (home) Distinct<View0,View1>(home,x,y);
    return ES_OK;
  }

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

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

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

  template <class View0, class View1>
  void
  Distinct<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) Distinct(home,x0,x1);
  }

  template <class View0, class View1>
  ExecStatus
  Distinct<View0,View1>::propagate(Space* home, ModEventDelta) {
    assert(x0.assigned()||x1.assigned());
    if (x0.assigned()) {
      GlbRanges<View0> xr(x0);
      IntSet xs(xr);
      ConstantView cv(home, xs);
      GECODE_REWRITE(this,(DistinctDoit<View1>::post(home,x1,cv)));
    } else {
      GlbRanges<View1> yr(x1);
      IntSet ys(yr);
      ConstantView cv(home, ys);
      GECODE_REWRITE(this,(DistinctDoit<View0>::post(home,x0,cv)));
    }
  }

  template <class View0>
  ExecStatus
  DistinctDoit<View0>::post(Space* home, View0 x, ConstantView y) {
    (void) new (home) DistinctDoit<View0>(home,x,y);
    return ES_OK;
  }

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

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

  template <class View0>
  Reflection::ActorSpec
  DistinctDoit<View0>::spec(const Space* home, Reflection::VarMap& m) const {
    Reflection::ActorSpec s =
      UnaryPropagator<View0,PC_SET_ANY>::spec(home, m, ati());
    return s << y.spec(home, m);
  }

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

  template <class View0>
  ExecStatus
  DistinctDoit<View0>::propagate(Space* home, ModEventDelta) {
    if (x0.assigned()) {
      GlbRanges<View0> xi(x0);
      GlbRanges<ConstantView> yi(y);
      if (Iter::Ranges::equal(xi,yi)) { return ES_FAILED; }
      else { return ES_SUBSUMED(this,home); }
    }
    assert(x0.lubSize()-x0.glbSize() >0);
    if (x0.cardMin()>y.cardMax()) { return ES_SUBSUMED(this,home); }
    if (x0.cardMax()<y.cardMin()) { return ES_SUBSUMED(this,home); }
    //These tests are too expensive, we should only do them
    //in the 1 unknown left case.
    GlbRanges<View0> xi1(x0);
    LubRanges<ConstantView> yi1(y);
    if (!Iter::Ranges::subset(xi1,yi1)){ return ES_SUBSUMED(this,home); }
    LubRanges<View0> xi2(x0);
    GlbRanges<ConstantView> yi2(y);
    if (!Iter::Ranges::subset(yi2,xi2)){ return ES_SUBSUMED(this,home); }
    // from here, we know y\subseteq lub(x) and glb(x)\subseteq y

    if (x0.lubSize() == y.cardMin() && x0.lubSize() > 0) {
      GECODE_ME_CHECK(x0.cardMax(home, x0.lubSize() - 1));
      return ES_SUBSUMED(this,home);
    }
    if (x0.glbSize() == y.cardMin()) {
      GECODE_ME_CHECK(x0.cardMin(home, x0.glbSize() + 1));
      return ES_SUBSUMED(this,home);
    }
    return ES_FIX;
  }

  template <class View0>
  forceinline
  DistinctDoit<View0>::DistinctDoit(Space* home, View0 _x, ConstantView _y)
    : UnaryPropagator<View0, PC_SET_ANY>(home,_x), y(_y)  {}

  template <class View0>
  forceinline
  DistinctDoit<View0>::DistinctDoit(Space* home, bool share,
                                    DistinctDoit<View0>& p)
    : UnaryPropagator<View0, PC_SET_ANY>(home,share,p) {
    y.update(home,share,p.y);
  }

}}}

// STATISTICS: set-prop