| ... |
... |
@@ -1006,36 +1006,38 @@
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| 1006 |
1006 |
typename Digraph::Node node = digraph.target(it);
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| 1007 |
1007 |
++it;
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| 1008 |
1008 |
while (it != INVALID) {
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| 1009 |
1009 |
if (digraph.source(it) != node) return false;
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| 1010 |
1010 |
node = digraph.target(it);
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| 1011 |
1011 |
++it;
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| 1012 |
1012 |
}
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| 1013 |
1013 |
return true;
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| 1014 |
1014 |
}
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| 1015 |
1015 |
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| 1016 |
1016 |
/// \brief The source of a path
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| 1017 |
1017 |
///
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| 1018 |
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/// This function returns the source of the given path.
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|
1018 |
/// This function returns the source node of the given path.
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|
1019 |
/// If the path is empty, then it returns \c INVALID.
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| 1019 |
1020 |
template <typename Digraph, typename Path>
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| 1020 |
1021 |
typename Digraph::Node pathSource(const Digraph& digraph, const Path& path) {
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| 1021 |
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return digraph.source(path.front());
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|
1022 |
return path.empty() ? INVALID : digraph.source(path.front());
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| 1022 |
1023 |
}
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| 1023 |
1024 |
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| 1024 |
1025 |
/// \brief The target of a path
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| 1025 |
1026 |
///
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| 1026 |
|
/// This function returns the target of the given path.
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|
1027 |
/// This function returns the target node of the given path.
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|
1028 |
/// If the path is empty, then it returns \c INVALID.
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| 1027 |
1029 |
template <typename Digraph, typename Path>
|
| 1028 |
1030 |
typename Digraph::Node pathTarget(const Digraph& digraph, const Path& path) {
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| 1029 |
|
return digraph.target(path.back());
|
|
1031 |
return path.empty() ? INVALID : digraph.target(path.back());
|
| 1030 |
1032 |
}
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| 1031 |
1033 |
|
| 1032 |
1034 |
/// \brief Class which helps to iterate through the nodes of a path
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| 1033 |
1035 |
///
|
| 1034 |
1036 |
/// In a sense, the path can be treated as a list of arcs. The
|
| 1035 |
1037 |
/// lemon path type stores only this list. As a consequence, it
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| 1036 |
1038 |
/// cannot enumerate the nodes in the path and the zero length paths
|
| 1037 |
1039 |
/// cannot have a source node.
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| 1038 |
1040 |
///
|
| 1039 |
1041 |
/// This class implements the node iterator of a path structure. To
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| 1040 |
1042 |
/// provide this feature, the underlying digraph should be passed to
|
| 1041 |
1043 |
/// the constructor of the iterator.
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