ClpPrimalColumnPivot.hpp

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/* $Id: ClpPrimalColumnPivot.hpp 1732 2011-05-31 08:09:41Z forrest $ */
// 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