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/usr/include/gecode/int/unary/detectable.hpp is in libgecode-dev 4.4.0-5.

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2009
 *
 *  Last modified:
 *     $Date: 2012-09-07 17:31:22 +0200 (Fri, 07 Sep 2012) $ by $Author: schulte $
 *     $Revision: 13068 $
 *
 *  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 Int { namespace Unary {

  template<class ManTaskView>
  forceinline ExecStatus
  detectable(Space& home, TaskViewArray<ManTaskView>& t) {
    sort<ManTaskView,STO_ECT,true>(t);

    Region r(home);

    OmegaTree<ManTaskView> o(r,t);
    TaskViewIter<ManTaskView,STO_LST,true> q(r,t);
    int* est = r.alloc<int>(t.size());

    for (int i=0; i<t.size(); i++) {
      while (q() && (t[i].ect() > t[q.task()].lst())) {
        o.insert(q.task()); ++q;
      }
      est[i] = o.ect(i);
    }

    for (int i=t.size(); i--; )
      GECODE_ME_CHECK(t[i].est(home,est[i]));
      
    return ES_OK;
  }
  
  template<class ManTask>
  ExecStatus
  detectable(Space& home, TaskArray<ManTask>& t) {
    TaskViewArray<typename TaskTraits<ManTask>::TaskViewFwd> f(t);
    GECODE_ES_CHECK(detectable(home,f));
    TaskViewArray<typename TaskTraits<ManTask>::TaskViewBwd> b(t);
    return detectable(home,b);
  }


  template<class OptTaskView>
  forceinline ExecStatus
  detectable(Space& home, Propagator& p, TaskViewArray<OptTaskView>& t) {
    sort<OptTaskView,STO_ECT,true>(t);

    Region r(home);

    OmegaTree<OptTaskView> o(r,t);
    ManTaskViewIter<OptTaskView,STO_LST,true> q(r,t);
    int* est = r.alloc<int>(t.size());

    for (int i=0; i<t.size(); i++) {
      while (q() && (t[i].ect() > t[q.task()].lst())) {
        o.insert(q.task()); ++q;
      }
      est[i] = o.ect(i);
    }

    int n = t.size();
    for (int i=n; i--; )
      if (t[i].mandatory()) {
        GECODE_ME_CHECK(t[i].est(home,est[i]));
      } else if (est[i] > t[i].lst()) {
        GECODE_ME_CHECK(t[i].excluded(home));
        t[i].cancel(home,p,Int::PC_INT_BND); t[i]=t[--n];
      }
    t.size(n);

    return (t.size() < 2) ? home.ES_SUBSUMED(p) : ES_OK;
  }
  
  template<class OptTask>
  ExecStatus
  detectable(Space& home, Propagator& p, TaskArray<OptTask>& t) {
    TaskViewArray<typename TaskTraits<OptTask>::TaskViewFwd> f(t);
    GECODE_ES_CHECK(detectable(home,p,f));
    TaskViewArray<typename TaskTraits<OptTask>::TaskViewBwd> b(t);
    return detectable(home,p,b);
  }

}}}

// STATISTICS: int-prop