AbcPrimalColumnPivot.hpp

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/* $Id: AbcPrimalColumnPivot.hpp 1910 2013-01-27 02:00:13Z stefan $ */
// 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