BonHeuristicDive.hpp

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// Copyright (C) 2007, International Business Machines Corporation and others. 
// All Rights Reserved.
// This code is published under the Eclipse Public License.
//
// Authors :
// Joao P. Goncalves, International Business Machines Corporation
//
// Date : November 12, 2007
 
#ifndef BonHeuristicDive_HPP
#define BonHeuristicDive_HPP
#include "BonOsiTMINLPInterface.hpp"
#include "BonBonminSetup.hpp"
#include "CbcHeuristic.hpp"
 
namespace Bonmin
{
  class HeuristicDive : public CbcHeuristic
  {
  public:
    HeuristicDive();

    HeuristicDive(BonminSetup * setup);

    HeuristicDive(const HeuristicDive &copy);

    ~HeuristicDive() {}

    HeuristicDive & operator=(const HeuristicDive & rhs);

    virtual CbcHeuristic * clone() const = 0;

    virtual void resetModel(CbcModel * model){
      setModel(model);
    }

    virtual void setSetup(BonminSetup * setup){
      setup_ = setup;
      //      Initialize(setup_->options());
    }

    void setPercentageToFix(double value)
    { percentageToFix_ = value; }

    virtual int solution(double &solutionValue, double *betterSolution);

    virtual void setInternalVariables(TMINLP2TNLP* minlp) = 0;


    virtual void selectVariableToBranch(TMINLP2TNLP* minlp,
                                        const vector<int> & integerColumns,
                                        const double* newSolution,
                                        int& bestColumn,
                                        int& bestRound) = 0;
 
  protected:
    BonminSetup * setup_; 

    double percentageToFix_;
 
  private:
    int howOften_;
 
  };

  bool isNlpFeasible(TMINLP2TNLP* minlp, const double primalTolerance);
  
  void adjustPrimalTolerance(TMINLP2TNLP* minlp, double & primalTolerance);
}
#endif