CouenneExprFloor.hpp

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/* $Id: CouenneExprFloor.hpp 720 2011-06-27 13:31:26Z pbelotti $
 *
 * Name:    exprFloor.hpp
 * Author:  Pietro Belotti
 * Purpose: definition of floor
 *
 * (C) Pietro Belotti, 2011.
 * This file is licensed under the Eclipse Public License (EPL)
 */

#ifndef COUENNE_EXPRFLOOR_HPP
#define COUENNE_EXPRFLOOR_HPP

#include "CouenneExpression.hpp"

namespace Couenne {


class exprFloor: public exprUnary {

 public:

  exprFloor (expression *arg):
    exprUnary (arg) {}

  expression *clone (Domain *d = NULL) const
  {return new exprFloor (argument_ -> clone (d));}

  inline unary_function F () 
  {return floor;}

  std::string printOp () const
  {return "floor";}

  inline CouNumber gradientNorm (const double *x) {
    return (argument_ -> Index () < 0) ? 
      0. : fabs (x [argument_ -> Index ()]);
  }

  expression *differentiate (int index); 

  void getBounds (expression *&, expression *&);

  void getBounds (CouNumber &lb, CouNumber &ub);

  void generateCuts (expression *w, //const OsiSolverInterface &si, 
                     OsiCuts &cs, const CouenneCutGenerator *cg, 
                     t_chg_bounds * = NULL, int = -1, 
                     CouNumber = -COUENNE_INFINITY, 
                     CouNumber =  COUENNE_INFINITY);

  virtual enum expr_type code ()
  {return COU_EXPRFLOOR;}

  bool impliedBound (int index, CouNumber *l, CouNumber *u, t_chg_bounds *chg, enum auxSign = expression::AUX_EQ) {

    bool impl = true;
    return impl;
  }

  virtual CouNumber selectBranch (const CouenneObject *obj, 
                                  const OsiBranchingInformation *info,
                                  expression * &var, 
                                  double * &brpts, 
                                  double * &brDist, // distance of current LP
                                                    // point to new convexifications
                                  int &way)
  {return 0.;}

  virtual void closestFeasible (expression *varind, expression *vardep,
                                CouNumber& left, CouNumber& right) const;

  virtual bool isCuttable (CouenneProblem *problem, int index) const
  {return false;}

  //virtual enum convexity convexity () const;
};

}

#endif