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-// $Id: CbcBranchDefaultDecision.hpp 1899 2013-04-09 18:12:08Z stefan $
-// 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).
-
-// Edwin 11/10/2009-- carved out of CbcBranchActual
-
-#ifndef CbcBranchDefaultDecision_H
-#define CbcBranchDefaultDecision_H
-
-#include "CbcBranchBase.hpp"
-/** Branching decision default class
-
- This class implements a simple default algorithm
- (betterBranch()) for choosing a branching variable.
-*/
-
-class CbcBranchDefaultDecision : public CbcBranchDecision {
-public:
- // Default Constructor
- CbcBranchDefaultDecision ();
-
- // Copy constructor
- CbcBranchDefaultDecision ( const CbcBranchDefaultDecision &);
-
- virtual ~CbcBranchDefaultDecision();
-
- /// Clone
- virtual CbcBranchDecision * clone() const;
-
- /// Initialize, <i>e.g.</i> before the start of branch selection at a node
- virtual void initialize(CbcModel * model);
-
- /** \brief Compare two branching objects. Return nonzero if \p thisOne is
- better than \p bestSoFar.
-
- The routine compares branches using the values supplied in \p numInfUp and
- \p numInfDn until a solution is found by search, after which it uses the
- values supplied in \p changeUp and \p changeDn. The best branching object
- seen so far and the associated parameter values are remembered in the
- \c CbcBranchDefaultDecision object. The nonzero return value is +1 if the
- up branch is preferred, -1 if the down branch is preferred.
-
- As the names imply, the assumption is that the values supplied for
- \p numInfUp and \p numInfDn will be the number of infeasibilities reported
- by the branching object, and \p changeUp and \p changeDn will be the
- estimated change in objective. Other measures can be used if desired.
-
- Because an \c CbcBranchDefaultDecision object remembers the current best
- branching candidate (#bestObject_) as well as the values used in the
- comparison, the parameter \p bestSoFar is redundant, hence unused.
- */
- virtual int betterBranch(CbcBranchingObject * thisOne,
- CbcBranchingObject * bestSoFar,
- double changeUp, int numInfUp,
- double changeDn, int numInfDn);
- /** Sets or gets best criterion so far */
- virtual void setBestCriterion(double value);
- virtual double getBestCriterion() const;
-
- /** \brief Compare N branching objects. Return index of best
- and sets way of branching in chosen object.
-
- This routine is used only after strong branching.
- */
-
- virtual int
- bestBranch (CbcBranchingObject ** objects, int numberObjects, int numberUnsatisfied,
- double * changeUp, int * numberInfeasibilitiesUp,
- double * changeDown, int * numberInfeasibilitiesDown,
- double objectiveValue) ;
-private:
-
- /// Illegal Assignment operator
- CbcBranchDefaultDecision & operator=(const CbcBranchDefaultDecision& rhs);
-
- /// data
-
- /// "best" so far
- double bestCriterion_;
-
- /// Change up for best
- double bestChangeUp_;
-
- /// Number of infeasibilities for up
- int bestNumberUp_;
-
- /// Change down for best
- double bestChangeDown_;
-
- /// Pointer to best branching object
- CbcBranchingObject * bestObject_;
-
- /// Number of infeasibilities for down
- int bestNumberDown_;
-
-};
-
-#endif
-