BonInitHeuristic.cpp

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/* $Id: BonInitHeuristic.cpp 886 2012-08-05 17:50:04Z pbelotti $ */
// (C) Copyright International Business Machines Corporation 2007 
// All Rights Reserved.
// This code is published under the Eclipse Public License (EPL).
//
// Authors :
// Andreas Waechter, International Business Machines Corporation
//
// Date : 12/07/2007

#include "BonInitHeuristic.hpp"
#include "CoinHelperFunctions.hpp"
#include "CouenneRecordBestSol.hpp"

using namespace Couenne;
 
InitHeuristic::InitHeuristic (double objValue, const double* sol,
                              CouenneProblem& cp):
  CbcHeuristic(),
  objValue_(COIN_DBL_MAX),
  sol_(NULL)
{
  when_ = 1; // to be run at root

  setHeuristicName("InitHeuristic");
  nVars_ = cp.nVars();

  if (cp.checkNLP0 (sol, objValue, true, false, true, true)) {

// #ifdef FM_CHECKNLP2
//     (cp.checkNLP2(sol, 0, false, true, true, cp.getFeasTol()))
// #else
//     (cp.checkNLP (sol, objValue, true)) // true for recomputing objValue 
// #endif

      sol_ = new double [nVars_];

#ifdef FM_CHECKNLP2
      CouenneRecordBestSol *rs = cp.getRecordBestSol();
      objValue_ = rs->getModSolVal();
      CoinCopyN (rs->getModSol(nVars_), nVars_, sol_);
#else
      objValue_ = objValue;
      CoinCopyN (sol, cp.nOrigVars (), sol_);
      cp.getAuxs(sol_);
#endif  
      }
}

InitHeuristic::InitHeuristic(const InitHeuristic & other)
  :
  CbcHeuristic(other),
  objValue_(other.objValue_),
  nVars_(other.nVars_)
{
  if (other.sol_) {
    sol_ = new double[nVars_];
    CoinCopyN(other.sol_, nVars_, sol_);
  }
  else {
    sol_ = NULL;
  }
}
  
CbcHeuristic * 
InitHeuristic::clone() const{
  return new InitHeuristic(*this);
}
  
InitHeuristic &
InitHeuristic::operator=(const InitHeuristic & rhs){
  if(this != &rhs){
    CbcHeuristic::operator=(rhs);
    objValue_ = rhs.objValue_;
    nVars_ = rhs.nVars_;
    if (sol_) {
      delete [] sol_;
      sol_ = NULL;
    }

    if (rhs.sol_) {
      sol_ = new double[nVars_];
      CoinCopyN(rhs.sol_, nVars_, sol_);
    }
  }
  return *this;
}
  
InitHeuristic::~InitHeuristic(){
  if(sol_)
    delete [] sol_;
}
  
int
InitHeuristic::solution(double & objectiveValue, double * newSolution){

  if (!sol_) return 0;

  int retval = 0;
  if (objValue_ < objectiveValue) {
    CoinCopyN(sol_, nVars_, newSolution);
    objectiveValue = objValue_;
    retval = 1;
  }
  delete [] sol_;
  sol_ = NULL;

  return retval;
}