mirror of https://github.com/CGAL/cgal
84 lines
1.9 KiB
C++
84 lines
1.9 KiB
C++
// Copyright (c) 2005 Stanford University (USA).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Daniel Russel <drussel@alumni.princeton.edu>
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#ifndef CGAL_LABEL_H_
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#define CGAL_LABEL_H_
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#include <CGAL/basic.h>
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#include <iostream>
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#include <sstream>
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CGAL_BEGIN_NAMESPACE
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//! A type which provides opaque, typed identifiers.
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/*!
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Basically this is just an int with a type associated with it
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and one value (-1) picked out as the null value. It implements
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comparisons and things.
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*/
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template <class A_Type>
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class Label
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{
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protected:
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typedef Label<A_Type> This;
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int id_;
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public:
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//! Construct it from an int
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explicit Label(int i):id_(i){}
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//! Construct a default (null) label
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Label():id_(-1) {
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if(0) print(); // make sure it is compiled
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}
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//! Make the next label
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CGAL_GETNR(This, successor, return This(id_+1));
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CGAL_IS(valid, return id_ >=0);
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CGAL_GETNR(unsigned int, index, CGAL_assertion(is_valid()); return id_);
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CGAL_COMPARISONS1(id_);
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std::ostream& write(std::ostream &out) const
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{
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if (id_ == -1) out << "(N)";
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else out << "(" << id_ << ")";
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return out;
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}
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void print() const
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{
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write(std::cout);
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}
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//! Convert to a string
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std::string string() const
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{
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std::ostringstream os;
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write(os);
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return os.str();
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}
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};
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CGAL_OUTPUT1(Label)
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CGAL_END_NAMESPACE
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#endif
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