CouenneExprConst.hpp

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/* $Id: CouenneExprConst.hpp 490 2011-01-14 16:07:12Z pbelotti $
 *
 * Name:    exprConst.hpp
 * Author:  Pietro Belotti
 * Purpose: definition of the class exprConst
 *
 * (C) Carnegie-Mellon University, 2006-09.
 * This file is licensed under the Eclipse Public License (EPL)
 */

#ifndef COUENNE_EXPRCONST_HPP
#define COUENNE_EXPRCONST_HPP

#include <iostream>

#include "CouenneTypes.hpp"
#include "CouenneExpression.hpp"

namespace Couenne {


class exprConst: public expression {

private: 

  CouNumber value_;

public:

  inline enum nodeType Type () const
  {return CONST;}

  inline CouNumber Value () const 
  {return value_;}

  exprConst (CouNumber value): 
    value_ (value) {}

  exprConst (const exprConst &e, Domain *d = NULL)
  {value_ = e.value_;}

  virtual inline expression *clone (Domain *d = NULL) const
  {return new exprConst (value_);}

  void print (std::ostream &out = std::cout, 
              bool = false) const
  {out << value_;}

  inline CouNumber operator() () 
  {return value_;}

  inline expression *differentiate (int) 
  {return new exprConst (0.);}

  inline int dependsOn (int *ind, int n, enum dig_type type = STOP_AT_AUX)
  {return 0;}

  inline int Linearity ()
  {return ((fabs (value_) < COUENNE_EPS) ? ZERO: CONSTANT);}

  inline void getBounds (expression *&lower, expression *&upper) {
    lower = new exprConst (value_);
    upper = new exprConst (value_);
  }

  inline void getBounds (CouNumber &lower, CouNumber &upper)
  {lower = upper = value_;}

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

  virtual inline enum expr_type code () 
  {return COU_EXPRCONST;}

  virtual inline bool isInteger () 
  {return Couenne::isInteger (value_);}

  virtual inline int rank ()
  {return 0;} 
};

}

#endif