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| 1 | // -*- mode:C++ -*- |
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| 2 | |
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| 3 | #ifndef HUGO_INVALID_H |
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| 4 | #define HUGO_INVALID_H |
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| 5 | |
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| 6 | namespace hugo { |
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| 7 | |
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| 8 | /// Dummy type to make it easier to make invalid iterators. |
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| 9 | |
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| 10 | /// See \ref INVALID, how to use it. |
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| 11 | |
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| 12 | struct Invalid {}; |
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| 13 | |
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| 14 | /// Invalid iterators. |
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| 15 | |
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| 16 | /// \ref Invalid is a global type that converts to each iterator |
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| 17 | /// in such a way that the value of the target iterator will be invalid. |
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| 18 | |
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| 19 | ///extern Invalid INVALID; |
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| 20 | |
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| 21 | const Invalid &INVALID = *(Invalid *)0; |
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| 22 | |
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| 23 | }; |
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| 24 | |
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| 25 | #endif |
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| 26 | |
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