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// Copyright (C) 2002, International Business Machines
// Corporation and others.  All Rights Reserved.
#ifndef ClpDualRowSteepest_H
#define ClpDualRowSteepest_H

#include "ClpDualRowPivot.hpp"
class CoinIndexedVector;


//#############################################################################

class ClpDualRowSteepest : public ClpDualRowPivot {
  
public:
  

  
  virtual int pivotRow();
  
  virtual double updateWeights(CoinIndexedVector * input,
                             CoinIndexedVector * spare,
                             CoinIndexedVector * updatedColumn);
  
  virtual void updatePrimalSolution(CoinIndexedVector * input,
                                    double theta,
                                    double & changeInObjective);

  virtual void saveWeights(ClpSimplex * model, int mode);
  virtual void unrollWeights();
  virtual void clearArrays();
  virtual bool looksOptimal() const;
  virtual void maximumPivotsChanged();
  
  enum Persistence {
    normal = 0x00, // create (if necessary) and destroy
    keep = 0x01 // create (if necessary) and leave
  };
  


  ClpDualRowSteepest(int mode=3); 
  
  ClpDualRowSteepest(const ClpDualRowSteepest &);
  
  ClpDualRowSteepest & operator=(const ClpDualRowSteepest& rhs);
  
  virtual ~ClpDualRowSteepest ();

  virtual ClpDualRowPivot * clone(bool copyData = true) const;
 


  inline int mode() const
    { return mode_;}
  inline void setPersistence(Persistence life)
  { persistence_ = life;}
  inline Persistence persistence() const
  { return persistence_ ;}

  //---------------------------------------------------------------------------
  
private:

  int state_;
  int mode_;
  Persistence persistence_;
  double * weights_;
  CoinIndexedVector * infeasible_;
  CoinIndexedVector * alternateWeights_;
  CoinIndexedVector * savedWeights_;
  int * dubiousWeights_;
};

#endif

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