Line | |
---|
1 | /* -*- C++ -*- |
---|
2 | * src/lemon/invalid.h - Part of LEMON, a generic C++ optimization library |
---|
3 | * |
---|
4 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
5 | * (Egervary Combinatorial Optimization Research Group, EGRES). |
---|
6 | * |
---|
7 | * Permission to use, modify and distribute this software is granted |
---|
8 | * provided that this copyright notice appears in all copies. For |
---|
9 | * precise terms see the accompanying LICENSE file. |
---|
10 | * |
---|
11 | * This software is provided "AS IS" with no warranty of any kind, |
---|
12 | * express or implied, and with no claim as to its suitability for any |
---|
13 | * purpose. |
---|
14 | * |
---|
15 | */ |
---|
16 | |
---|
17 | #ifndef LEMON_INVALID_H |
---|
18 | #define LEMON_INVALID_H |
---|
19 | |
---|
20 | ///\file |
---|
21 | ///\brief Definition of INVALID. |
---|
22 | |
---|
23 | namespace lemon { |
---|
24 | |
---|
25 | /// Dummy type to make it easier to make invalid iterators. |
---|
26 | |
---|
27 | /// See \ref INVALID, how to use it. |
---|
28 | |
---|
29 | struct Invalid { |
---|
30 | public: |
---|
31 | bool operator==(Invalid) { return true; } |
---|
32 | bool operator!=(Invalid) { return false; } |
---|
33 | bool operator< (Invalid) { return false; } |
---|
34 | }; |
---|
35 | |
---|
36 | /// Invalid iterators. |
---|
37 | |
---|
38 | /// \ref Invalid is a global type that converts to each iterator |
---|
39 | /// in such a way that the value of the target iterator will be invalid. |
---|
40 | |
---|
41 | // It is also used to convert the \c INVALID constant to the |
---|
42 | // node iterator that makes is possible to write |
---|
43 | |
---|
44 | //extern Invalid INVALID; |
---|
45 | |
---|
46 | //const Invalid &INVALID = *(Invalid *)0; |
---|
47 | const Invalid INVALID = Invalid(); |
---|
48 | |
---|
49 | } //namespace lemon |
---|
50 | |
---|
51 | #endif |
---|
52 | |
---|
Note: See
TracBrowser
for help on using the repository browser.