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

class ClpSimplex;
class CoinIndexedVector;

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

class ClpDualRowPivot  {
  
public:
  

  
  virtual int pivotRow() = 0;
  
  virtual double updateWeights(CoinIndexedVector * input,
                             CoinIndexedVector * spare,
                             CoinIndexedVector * updatedColumn) = 0;
  
   /* FIXME: this was pure virtul (=0). Why? */
  virtual void updatePrimalSolution(CoinIndexedVector * input,
                                    double theta,
                                    double & changeInObjective) = 0;
  virtual void saveWeights(ClpSimplex * model,int mode);
  virtual void checkAccuracy();
  virtual void unrollWeights();
  virtual void clearArrays();
  virtual bool looksOptimal() const
  { return false;}
  virtual void maximumPivotsChanged() {}
  
  


  ClpDualRowPivot(); 
  
  ClpDualRowPivot(const ClpDualRowPivot &);
  
  ClpDualRowPivot & operator=(const ClpDualRowPivot& rhs);
  
  virtual ~ClpDualRowPivot ();

  virtual ClpDualRowPivot * clone(bool copyData = true) const = 0;
 



  inline ClpSimplex * model()
  { return model_;}
  
  inline int type()
  { return type_;}
  

  //---------------------------------------------------------------------------
  
protected:


  ClpSimplex * model_;
  int type_;
};

#endif

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