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