set.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2004
 *
 *  Last modified:
 *     $Date: 2011-11-18 16:02:48 +0100 (Fri, 18 Nov 2011) $ by $Author: schulte $
 *     $Revision: 12472 $
 *
 *  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
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 */

namespace Gecode { namespace Int { namespace Dom {

  template<class View, ReifyMode rm>
  forceinline
  ReIntSet<View,rm>::ReIntSet
  (Home home, View x, const IntSet& s, BoolView b)
    : ReUnaryPropagator<View,PC_INT_DOM,BoolView>(home,x,b), is(s) {
    home.notice(*this,AP_DISPOSE);
  }

  template<class View, ReifyMode rm>
  forceinline size_t
  ReIntSet<View,rm>::dispose(Space& home) {
    home.ignore(*this,AP_DISPOSE);
    is.~IntSet();
    (void) ReUnaryPropagator<View,PC_INT_DOM,BoolView>::dispose(home);
    return sizeof(*this);
  }

  template<class View, ReifyMode rm>
  ExecStatus
  ReIntSet<View,rm>::post(Home home, View x, const IntSet& s, BoolView b) {
    if (s.ranges() == 0) {
      if (rm == RM_PMI)
        return ES_OK;
      GECODE_ME_CHECK(b.zero(home));
    } else if (s.ranges() == 1) {
      return ReRange<View,rm>::post(home,x,s.min(),s.max(),b);
    } else if (b.one()) {
      if (rm == RM_PMI)
        return ES_OK;
      IntSetRanges i_is(s);
      GECODE_ME_CHECK(x.inter_r(home,i_is,false));
    } else if (b.zero()) {
      if (rm == RM_IMP)
        return ES_OK;
      IntSetRanges i_is(s);
      GECODE_ME_CHECK(x.minus_r(home,i_is,false));
    } else {
      (void) new (home) ReIntSet<View,rm>(home,x,s,b);
    }
    return ES_OK;
  }


  template<class View, ReifyMode rm>
  forceinline
  ReIntSet<View,rm>::ReIntSet(Space& home, bool share, ReIntSet& p)
    : ReUnaryPropagator<View,PC_INT_DOM,BoolView>(home,share,p) {
    is.update(home,share,p.is);
  }

  template<class View, ReifyMode rm>
  Actor*
  ReIntSet<View,rm>::copy(Space& home, bool share) {
    return new (home) ReIntSet(home,share,*this);
  }

  template<class View, ReifyMode rm>
  ExecStatus
  ReIntSet<View,rm>::propagate(Space& home, const ModEventDelta&) {
    IntSetRanges i_is(is);
    if (b.one()) {
      if (rm != RM_PMI)
        GECODE_ME_CHECK(x0.inter_r(home,i_is,false));
      return home.ES_SUBSUMED(*this);
    }
    if (b.zero()) {
      if (rm != RM_IMP)
        GECODE_ME_CHECK(x0.minus_r(home,i_is,false));
      return home.ES_SUBSUMED(*this);
    }

    {
      ViewRanges<View> i_x(x0);

      switch (Iter::Ranges::compare(i_x,i_is)) {
      case Iter::Ranges::CS_SUBSET:
        if (rm != RM_IMP)
          GECODE_ME_CHECK(b.one_none(home));
        return home.ES_SUBSUMED(*this);
      case Iter::Ranges::CS_DISJOINT:
        if (rm != RM_PMI)
          GECODE_ME_CHECK(b.zero_none(home));
        return home.ES_SUBSUMED(*this);
      case Iter::Ranges::CS_NONE:
        break;
      default: GECODE_NEVER;
      }
    }
    return ES_FIX;
  }

}}}

// STATISTICS: int-prop