/*
 *  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: 2006-07-19 14:57:38 +0200 (Wed, 19 Jul 2006) $ by $Author: schulte $
 *     $Revision: 3413 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  See the file "LICENSE" for information on usage and
 *  redistribution of this file, and for a
 *     DISCLAIMER OF ALL WARRANTIES.
 *
 */

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;
  }

  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;
  }

  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;
  }

  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;
  }

  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;
  }

}}}

// STATISTICS: set-branch