ClpPrimalColumnPivot.hpp

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/* $Id$ */
// Copyright (C) 2002, International Business Machines
// Corporation and others.  All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).
 
#ifndef ClpPrimalcolumnPivot_H
#define ClpPrimalcolumnPivot_H
 
class ClpSimplex;
class CoinIndexedVector;
 
//#############################################################################
 
class ClpPrimalColumnPivot {
 
public:
 
 
  virtual int pivotColumn(CoinIndexedVector *updates,
    CoinIndexedVector *spareRow1,
    CoinIndexedVector *spareRow2,
    CoinIndexedVector *spareColumn1,
    CoinIndexedVector *spareColumn2)
    = 0;
 
  virtual void updateWeights(CoinIndexedVector *input);
 
  virtual void saveWeights(ClpSimplex *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;
  }
 
 
  ClpPrimalColumnPivot();
 
  ClpPrimalColumnPivot(const ClpPrimalColumnPivot &);
 
  ClpPrimalColumnPivot &operator=(const ClpPrimalColumnPivot &rhs);
 
  virtual ~ClpPrimalColumnPivot();
 
  virtual ClpPrimalColumnPivot *clone(bool copyData = true) const = 0;
 
 
 
  inline ClpSimplex *model()
  {
    return model_;
  }
  inline void setModel(ClpSimplex *newmodel)
  {
    model_ = newmodel;
  }
 
  inline int type()
  {
    return type_;
  }
 
  virtual int numberSprintColumns(int &numberIterations) const;
  virtual void switchOffSprint();
  virtual void maximumPivotsChanged() {}
 
 
  //---------------------------------------------------------------------------
 
protected:
 
  ClpSimplex *model_;
  int type_;
  bool looksOptimal_;
};
#ifndef CLP_PRIMAL_SLACK_MULTIPLIER
#define CLP_PRIMAL_SLACK_MULTIPLIER 1.01
#endif
#endif
 
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