CbcHeuristicRENS.hpp

// $Id$
// Copyright (C) 2006, International Business Machines
// Corporation and others.  All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).

// edwin 12/5/09 carved out of CbcHeuristicRINS

#ifndef CbcHeuristicRENS_H
#define CbcHeuristicRENS_H

#include "CbcHeuristic.hpp"

/** LocalSearch class
 */

class CbcHeuristicRENS : public CbcHeuristic {
public:
  // Default Constructor
  CbcHeuristicRENS();

  /* Constructor with model - assumed before cuts
       Initial version does not do Lps
    */
  CbcHeuristicRENS(CbcModel &model);

  // Copy constructor
  CbcHeuristicRENS(const CbcHeuristicRENS &);

  // Destructor
  ~CbcHeuristicRENS();

  /// Clone
  virtual CbcHeuristic *clone() const;

  /// Assignment operator
  CbcHeuristicRENS &operator=(const CbcHeuristicRENS &rhs);

  /// Resets stuff if model changes
  virtual void resetModel(CbcModel *model);

  /// update model (This is needed if cliques update matrix etc)
  virtual void setModel(CbcModel *model);

  using CbcHeuristic::solution;
  /** returns 0 if no solution, 1 if valid solution.
        Sets solution values if good, sets objective value (only if good)
        This does Relaxation Extension Neighborhood Search
        Does not run if when_<2 and a solution exists
    */
  virtual int solution(double &objectiveValue,
    double *newSolution);

  /// Set type
  inline void setRensType(int value)
  {
    rensType_ = value;
  }

protected:
  // Data
  /// Number of tries
  int numberTries_;
  /** Type
        0 - fix at LB
        1 - fix on dj
        2 - fix at UB as well
	3 - fix on 0.01*average dj
	add 16 to allow two tries
	32 - if solution exists use to keep more variables
	64 - if priorities keep high priority
	128 - if priorities keep low priority
    */
  int rensType_;
};

#endif

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