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// 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; either version 3 of the License,
// or (at your option) any later version.
//
// 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/next/Kinetic_data_structures/include/CGAL/Tools/Label.h $
// $Id: Label.h 67093 2012-01-13 11:22:39Z lrineau $
//
//
// Author(s) : Daniel Russel <drussel@alumni.princeton.edu>
#ifndef CGAL_LABEL_H_
#define CGAL_LABEL_H_
#include <CGAL/basic.h>
#include <iostream>
#include <sstream>
namespace CGAL {
//! A type which provides opaque, typed identifiers.
/*!
Basically this is just an int with a type associated with it
and one value (-1) picked out as the null value. It implements
comparisons and things.
*/
template <class A_Type>
class Label
{
protected:
typedef Label<A_Type> This;
int id_;
public:
//! Construct it from an int
explicit Label(int i):id_(i){}
//! Construct a default (null) label
Label():id_(-1) {
if(0) print(); // make sure it is compiled
}
//! Make the next label
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);
}
//! Convert to a string
std::string string() const
{
std::ostringstream os;
write(os);
return os.str();
}
};
CGAL_OUTPUT1(Label)
} //namespace CGAL
#endif
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