COIN-OR::LEMON - Graph Library

source: lemon-0.x/lemon/bits/invalid.h @ 1993:2115143eceea

Last change on this file since 1993:2115143eceea was 1993:2115143eceea, checked in by Balazs Dezso, 14 years ago

utility, invalid and traits moved to bits

File size: 1.3 KB
Line 
1/* -*- C++ -*-
2 *
3 * This file is a part of LEMON, a generic C++ optimization library
4 *
5 * Copyright (C) 2003-2006
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
8 *
9 * Permission to use, modify and distribute this software is granted
10 * provided that this copyright notice appears in all copies. For
11 * precise terms see the accompanying LICENSE file.
12 *
13 * This software is provided "AS IS" with no warranty of any kind,
14 * express or implied, and with no claim as to its suitability for any
15 * purpose.
16 *
17 */
18
19#ifndef LEMON_BITS_INVALID_H
20#define LEMON_BITS_INVALID_H
21
22///\file
23///\brief Definition of INVALID.
24
25namespace lemon {
26
27  /// Dummy type to make it easier to make invalid iterators.
28 
29  /// See \ref INVALID, how to use it.
30 
31  struct Invalid {
32  public:
33    bool operator==(Invalid) { return true;  }
34    bool operator!=(Invalid) { return false; }
35    bool operator< (Invalid) { return false; }
36  };
37 
38  /// Invalid iterators.
39 
40  /// \ref Invalid is a global type that converts to each iterator
41  /// in such a way that the value of the target iterator will be invalid.
42
43  //const Invalid &INVALID = *(Invalid *)0;
44
45#ifdef LEMON_ONLY_TEMPLATES
46  const Invalid INVALID = Invalid();
47#else
48  extern const Invalid INVALID;
49#endif
50
51} //namespace lemon
52
53#endif
54 
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