AbcPrimalColumnPivot.hpp

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/* $Id: AbcPrimalColumnPivot.hpp 2385 2019-01-06 19:43:06Z unxusr $ */
// Copyright (C) 2002, International Business Machines
// Corporation and others, Copyright (C) 2012, FasterCoin.  All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).

#ifndef AbcPrimalColumnPivot_H
#define AbcPrimalColumnPivot_H
#include "AbcCommon.hpp"

class AbcSimplex;
class CoinIndexedVector;

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

class AbcPrimalColumnPivot {

public:


  virtual int pivotColumn(CoinPartitionedVector *updates,
    CoinPartitionedVector *spareRow2,
    CoinPartitionedVector *spareColumn1)
    = 0;

  virtual void updateWeights(CoinIndexedVector *input);

  virtual void saveWeights(AbcSimplex *model, int mode) = 0;
  virtual int pivotRow(double &way)
  {
    way = 0;
    return -2;
  }
  virtual void clearArrays();
  virtual bool looksOptimal() const
  {
    return looksOptimal_;
  }
  virtual void setLooksOptimal(bool flag)
  {
    looksOptimal_ = flag;
  }


  AbcPrimalColumnPivot();

  AbcPrimalColumnPivot(const AbcPrimalColumnPivot &);

  AbcPrimalColumnPivot &operator=(const AbcPrimalColumnPivot &rhs);

  virtual ~AbcPrimalColumnPivot();

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



  inline AbcSimplex *model()
  {
    return model_;
  }
  inline void setModel(AbcSimplex *newmodel)
  {
    model_ = newmodel;
  }

  inline int type()
  {
    return type_;
  }

  virtual int numberSprintColumns(int &numberIterations) const;
  virtual void switchOffSprint();
  virtual void maximumPivotsChanged() {}


  //---------------------------------------------------------------------------

protected:

  AbcSimplex *model_;
  int type_;
  bool looksOptimal_;
};
#ifndef CLP_PRIMAL_SLACK_MULTIPLIER
#define CLP_PRIMAL_SLACK_MULTIPLIER 1.01
#endif
#endif

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