COIN-OR::LEMON - Graph Library

source: lemon-0.x/src/include/invalid.h @ 412:5d48b6773b73

Last change on this file since 412:5d48b6773b73 was 412:5d48b6773b73, checked in by Alpar Juttner, 16 years ago

To be on the safe side...

File size: 842 bytes
Line 
1// -*- mode:C++ -*-
2
3#ifndef HUGO_INVALID_H
4#define HUGO_INVALID_H
5
6///\file
7///\brief Definition of INVALID.
8
9namespace hugo {
10
11  /// Dummy type to make it easier to make invalid iterators.
12 
13  /// See \ref INVALID, how to use it.
14 
15  struct Invalid {
16  public:
17    bool operator==(Invalid) { return true;  }
18    bool operator!=(Invalid) { return false; }
19    bool operator< (Invalid) { return false; }
20  };
21 
22  /// Invalid iterators.
23 
24  /// \ref Invalid is a global type that converts to each iterator
25  /// in such a way that the value of the target iterator will be invalid.
26
27  // It is also used to convert the \c INVALID constant to the
28  // node iterator that makes is possible to write
29
30  //extern Invalid INVALID;
31
32  //const Invalid &INVALID = *(Invalid *)0;
33  const Invalid INVALID = Invalid();
34
35} //namespace hugo
36
37#endif
38 
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