overload.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, 2009
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
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namespace Gecode { namespace Int { namespace Unary {

  // Overload checking for mandatory tasks
  template<class ManTask>
  ExecStatus
  overload(TaskArray<ManTask>& t) {
    TaskViewArray<typename TaskTraits<ManTask>::TaskViewFwd> f(t);
    sort<typename TaskTraits<ManTask>::TaskViewFwd,STO_LCT,true>(f);

    Region r;
    OmegaTree<typename TaskTraits<ManTask>::TaskViewFwd> o(r,f);

    for (int i=0; i<f.size(); i++) {
      o.insert(i);
      if (o.ect() > f[i].lct())
        return ES_FAILED;
    }
    return ES_OK;
  }

  // Overload checking for optional tasks
  template<class OptTask, class PL>
  ExecStatus
  overload(Space& home, Propagator& p, TaskArray<OptTask>& t) {
    TaskViewArray<typename TaskTraits<OptTask>::TaskViewFwd> f(t);
    sort<typename TaskTraits<OptTask>::TaskViewFwd,STO_LCT,true>(f);

    Region r;
    OmegaLambdaTree<typename TaskTraits<OptTask>::TaskViewFwd> ol(r,f,false);

    bool to_purge = false;

    for (int i=0; i<f.size(); i++) {
      if (f[i].optional()) {
        ol.linsert(i);
      } else if (f[i].mandatory()) {
        ol.oinsert(i);
        if (ol.ect() > f[i].lct())
          return ES_FAILED;
      }
      while (!ol.lempty() && (ol.lect() > f[i].lct())) {
        int j = ol.responsible();
        GECODE_ME_CHECK(f[j].excluded(home));
        ol.lremove(j);
        to_purge = true;
      }
    }

    if (to_purge)
      GECODE_ES_CHECK((purge<OptTask,PL>(home,p,t)));
    return ES_OK;
  }

}}}

// STATISTICS: int-prop