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Location: LEMON/LEMON-official/lemon/bits/invalid.h

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kpeter (Peter Kovacs)
Small fixes. Documentation fixes. Removed \author tags. Removed superfluous ; characters after function codes.
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/* -*- C++ -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2003-2007

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */



#ifndef LEMON_BITS_INVALID_H

#define LEMON_BITS_INVALID_H



///\file

///\brief Definition of INVALID.



namespace lemon {



  /// \brief Dummy type to make it easier to make invalid iterators.

  ///

  /// See \ref INVALID for the usage.

  struct Invalid {

  public:

    bool operator==(Invalid) { return true;  }

    bool operator!=(Invalid) { return false; }

    bool operator< (Invalid) { return false; }

  };

  

  /// Invalid iterators.

  

  /// \ref Invalid is a global type that converts to each iterator

  /// in such a way that the value of the target iterator will be invalid.



  //Some people didn't like this:

  //const Invalid &INVALID = *(Invalid *)0;



#ifdef LEMON_ONLY_TEMPLATES

  const Invalid INVALID = Invalid();

#else

  extern const Invalid INVALID;

#endif



} //namespace lemon



#endif