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