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22 ///\file |
22 ///\file |
23 ///\brief Definition of INVALID. |
23 ///\brief Definition of INVALID. |
24 |
24 |
25 namespace lemon { |
25 namespace lemon { |
26 |
26 |
27 /// \brief Dummy type to make it easier to make invalid iterators. |
27 /// \brief Dummy type to make it easier to create invalid iterators. |
28 /// |
28 /// |
29 /// See \ref INVALID for the usage. |
29 /// See \ref INVALID for the usage. |
30 struct Invalid { |
30 struct Invalid { |
31 public: |
31 public: |
32 bool operator==(Invalid) { return true; } |
32 bool operator==(Invalid) { return true; } |
33 bool operator!=(Invalid) { return false; } |
33 bool operator!=(Invalid) { return false; } |
34 bool operator< (Invalid) { return false; } |
34 bool operator< (Invalid) { return false; } |
35 }; |
35 }; |
36 |
36 |
37 /// Invalid iterators. |
37 /// \brief Invalid iterators. |
38 |
38 /// |
39 /// \ref Invalid is a global type that converts to each iterator |
39 /// \ref Invalid is a global type that converts to each iterator |
40 /// in such a way that the value of the target iterator will be invalid. |
40 /// in such a way that the value of the target iterator will be invalid. |
41 |
41 |
42 //Some people didn't like this: |
42 //Some people didn't like this: |
43 //const Invalid &INVALID = *(Invalid *)0; |
43 //const Invalid &INVALID = *(Invalid *)0; |