SPAR/AIModule/BWTA/vendors/CGAL/CGAL/Tools/Label.h

Go to the documentation of this file.

// Copyright (c) 2005  Stanford University (USA).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.5-branch/Kinetic_data_structures/include/CGAL/Tools/Label.h $
// $Id: Label.h 39077 2007-06-13 23:19:20Z drussel $
// 
//
// Author(s)     : Daniel Russel <drussel@alumni.princeton.edu>

#ifndef CGAL_LABEL_H_
#define CGAL_LABEL_H_
#include <CGAL/basic.h>
#include <iostream>
#include <sstream>

CGAL_BEGIN_NAMESPACE


template <class A_Type>
class Label
{
protected:
  typedef Label<A_Type> This;
  int id_;

public:
  explicit Label(int i):id_(i){}
  Label():id_(-1) {
    if(0) print();                        // make sure it is compiled
  }
  
  CGAL_GETNR(This, successor, return This(id_+1));

  CGAL_IS(valid, return id_ >=0);

  CGAL_GETNR(unsigned int, index, CGAL_assertion(is_valid()); return id_);

  CGAL_COMPARISONS1(id_);

  std::ostream& write(std::ostream &out) const
  {
    if (id_ == -1) out << "(N)";
    else out << "(" << id_ << ")";
    return out;
  }
  void print() const
  {
    write(std::cout);
  }
  std::string string() const
  {
    std::ostringstream os;
    write(os);
    return os.str();
  }
};

CGAL_OUTPUT1(Label);


CGAL_END_NAMESPACE
#endif