/******************************************************************************
* NOMAD -  Nonlinear Optimization for Mixed vAriables and Derivatives.        *
* Copyright (C) 2001-2004  Gilles Couture - Ecole Polytechnique,              *
*                          Charles Audet - Ecole Polytechnique,               *
*		           John Dennis - Rice University.                     *
*                                                                             *
* Author: Gilles Couture                                                      *
* École Polytechnique de Montréal - GERAD                                     *
* C.P. 6079, Succ. Centre-ville, Montréal (Québec) H3C 3A7 Canada             *
* Tel:  (514) 340-6053 x6928                                                  *
* Email: Gilles.Couture@gerad.ca                                              *
* Fax: (514) 340-5665                                                         *
*                                                                             *
* This program is free software; you can redistribute it and/or               *
* modify it under the terms of the GNU General Public License                 *
* as published by the Free Software Foundation. You can find the              *
* GNU General Public License at:                                              *
*             http://www.gnu.org/copyleft/gpl.html                            *
*                                                                             *
* This program is distributed in the hope that it will be useful,             *
* but WITHOUT ANY WARRANTY; without even the implied warranty of              *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               *
* GNU General Public License for more details.                                *
*                                                                             *
* You should have received a copy of the GNU General Public License           *
* along with this program; if not, write to the Free Software                 *
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. *
*                                                                             *
* You can find information on the NOMAD software at:                          *
*             http://www.gerad.ca/NOMAD/                                      *
******************************************************************************/

// direction.h -- class definition for Direction. This class represents a
// single poll direction.

#ifndef _DIRECTION_H_
#define _DIRECTION_H_
#include <vector>
using namespace std;

class Direction
{
  // Each direction is a vector of real numbers, 'std::vector<double>' in the
  // STL notation.
 private:
  static int num_dir;
  std::vector<double> dir;
	
// The class methods are described in "direction.cpp"
 public:
  Direction(const std::vector<double> v);
	Direction::Direction(const Direction & d);
  ~Direction();

  // Non-member functions.
  // ---------------------

  friend ostream & operator<<(ostream & os, const Direction & d);

  // Inline methods.
  // ---------------

  // This method returns the number at position 'n' in the vector.
  double get(const int n) const {return dir[n];}
  // This method returns the direction.
  std::vector<double> & getDirection() {return dir;}
  // This method puts the number 'val' at position 'n'.
  void set(const int n, const double val) {dir[n] = val;}
};
#endif
