Line | |
---|

1 | // -*- c++ -*- |
---|

2 | #ifndef HUGO_BIPARTITE_GRAPHS_H |
---|

3 | #define HUGO_BIPARTITE_GRAPHS_H |
---|

4 | |
---|

5 | #include <bfs_iterator.h> |
---|

6 | #include <for_each_macros.h> |
---|

7 | |
---|

8 | namespace hugo { |
---|

9 | |
---|

10 | /// This function eat a read-write \c BoolMap& bool_map, |
---|

11 | /// which have to work well up |
---|

12 | /// to its \c set and \c operator[]() method. Thus we have to deal |
---|

13 | /// very carefully with an uninitialized \c IterableBoolMap. |
---|

14 | template<typename Graph, typename BoolMap> |
---|

15 | bool isBipartite(const Graph& g, BoolMap& bool_map) { |
---|

16 | typedef typename Graph::template NodeMap<bool> ReachedMap; |
---|

17 | ReachedMap reached(g/*, false*/); |
---|

18 | BfsIterator<Graph, ReachedMap> bfs(g, reached); |
---|

19 | FOR_EACH_LOC(typename Graph::NodeIt, n, g) { |
---|

20 | if (!reached[n]) { |
---|

21 | bfs.pushAndSetReached(n); |
---|

22 | bool_map.set(n, false) { |
---|

23 | while (!bfs.finished()) { |
---|

24 | if (bfs.isBNodeNewlyReached()) { |
---|

25 | bool_map.set(bfs.bNode())=!bfs.aNode(); |
---|

26 | } else { |
---|

27 | if (bool_map[bfs.bNode()]==bool_map[bfs.aNode()]) { |
---|

28 | return false; |
---|

29 | } |
---|

30 | } |
---|

31 | ++bfs; |
---|

32 | } |
---|

33 | } |
---|

34 | } |
---|

35 | } |
---|

36 | return true; |
---|

37 | } |
---|

38 | } |
---|

39 | #endif //HUGO_BIPARTITE_GRAPHS_H |
---|

**Note:** See

TracBrowser
for help on using the repository browser.