select-view.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 Branch {

  forceinline ViewSelStatus
  ByNone::init(const Space*, SetView) {
    return VSS_COMMIT;
  }
  forceinline ViewSelStatus
  ByNone::select(const Space*, SetView) {
    GECODE_NEVER;
    return VSS_NONE;
  }
  inline Support::Symbol
  ByNone::type(void) {
    return Support::Symbol("Gecode::Set::Branch::ByNone");
  }

  forceinline ViewSelStatus
  ByMinCard::init(const Space*, SetView x) { 
    minCard = x.unknownSize();
    return (minCard == 1) ? VSS_COMMIT : VSS_SELECT;
  }
  forceinline ViewSelStatus
  ByMinCard::select(const Space*, SetView x) {
    unsigned int us = x.unknownSize();
    if (us < minCard) {
      minCard = us;
      return (minCard == 1) ? VSS_COMMIT : VSS_SELECT;
    }
    return VSS_NONE;
  }
  inline Support::Symbol
  ByMinCard::type(void) {
    return Support::Symbol("Gecode::Set::Branch::ByMinCard");
  }

  forceinline ViewSelStatus
  ByMaxCard::init(const Space*, SetView x) { 
    maxCard = x.unknownSize();
    return VSS_SELECT;
  }
  forceinline ViewSelStatus
  ByMaxCard::select(const Space*, SetView x) {
    unsigned int us = x.unknownSize();
    if (us > maxCard) {
      maxCard = us; return VSS_SELECT;
    }
    return VSS_NONE;
  }
  inline Support::Symbol
  ByMaxCard::type(void) {
    return Support::Symbol("Gecode::Set::Branch::ByMaxCard");
  }

  forceinline ViewSelStatus
  ByMinUnknown::init(const Space*, SetView x) {
    UnknownRanges<SetView> unknown(x);
    minUnknown = unknown.min();
    return VSS_SELECT;
  }
  forceinline ViewSelStatus
  ByMinUnknown::select(const Space*, SetView x) {
    UnknownRanges<SetView> unknown(x);
    int um = unknown.min();
    if (um < minUnknown) {
      minUnknown = um; return VSS_SELECT;
    }
    return VSS_NONE;
  }
  inline Support::Symbol
  ByMinUnknown::type(void) {
    return Support::Symbol("Gecode::Set::Branch::ByMinUnknown");
  }

  forceinline ViewSelStatus
  ByMaxUnknown::init(const Space*, SetView x) {
    UnknownRanges<SetView> unknown(x);
    do {
      maxUnknown = unknown.max();
      ++unknown;
    } while(unknown());
    return VSS_SELECT;
  }
  forceinline ViewSelStatus
  ByMaxUnknown::select(const Space*, SetView x) {
    UnknownRanges<SetView> unknown(x);
    int um = 0;
    assert(unknown());
    do {
      um = unknown.max();
      ++unknown;
    } while(unknown());
    if (um > maxUnknown) {
      maxUnknown = um; return VSS_SELECT;
    }
    return VSS_NONE;
  }
  inline Support::Symbol
  ByMaxUnknown::type(void) {
    return Support::Symbol("Gecode::Set::Branch::ByMaxUnknown");
  }

}}}

// STATISTICS: set-branch