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@@ -970,108 +970,110 @@
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| 970 |
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template <typename Target, typename Source,
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bool revEnable = RevPathTagIndicator<Source>::value>
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struct PathCopySelector {
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static void copy(Target& target, const Source& source) {
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PathCopySelectorForward<Target, Source>::copy(target, source);
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}
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};
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template <typename Target, typename Source>
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struct PathCopySelector<Target, Source, true> {
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static void copy(Target& target, const Source& source) {
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PathCopySelectorBackward<Target, Source>::copy(target, source);
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}
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};
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}
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/// \brief Make a copy of a path.
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///
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/// This function makes a copy of a path.
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template <typename Target, typename Source>
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void copyPath(Target& target, const Source& source) {
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checkConcept<concepts::PathDumper<typename Source::Digraph>, Source>();
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_path_bits::PathCopySelector<Target, Source>::copy(target, source);
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}
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/// \brief Check the consistency of a path.
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///
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/// This function checks that the target of each arc is the same
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/// as the source of the next one.
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///
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template <typename Digraph, typename Path>
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bool checkPath(const Digraph& digraph, const Path& path) {
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typename Path::ArcIt it(path);
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if (it == INVALID) return true;
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typename Digraph::Node node = digraph.target(it);
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++it;
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while (it != INVALID) {
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if (digraph.source(it) != node) return false;
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node = digraph.target(it);
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++it;
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}
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return true;
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}
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/// \brief The source of a path
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///
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/// This function returns the source of the given path.
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/// This function returns the source node of the given path.
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/// If the path is empty, then it returns \c INVALID.
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template <typename Digraph, typename Path>
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typename Digraph::Node pathSource(const Digraph& digraph, const Path& path) {
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return digraph.source(path.front());
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return path.empty() ? INVALID : digraph.source(path.front());
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}
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1024 |
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/// \brief The target of a path
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///
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/// This function returns the target of the given path.
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/// This function returns the target node of the given path.
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/// If the path is empty, then it returns \c INVALID.
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template <typename Digraph, typename Path>
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typename Digraph::Node pathTarget(const Digraph& digraph, const Path& path) {
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return digraph.target(path.back());
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return path.empty() ? INVALID : digraph.target(path.back());
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}
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/// \brief Class which helps to iterate through the nodes of a path
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///
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/// In a sense, the path can be treated as a list of arcs. The
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/// lemon path type stores only this list. As a consequence, it
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/// cannot enumerate the nodes in the path and the zero length paths
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/// cannot have a source node.
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///
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/// This class implements the node iterator of a path structure. To
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/// provide this feature, the underlying digraph should be passed to
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/// the constructor of the iterator.
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template <typename Path>
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class PathNodeIt {
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private:
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const typename Path::Digraph *_digraph;
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typename Path::ArcIt _it;
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typename Path::Digraph::Node _nd;
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public:
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typedef typename Path::Digraph Digraph;
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typedef typename Digraph::Node Node;
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/// Default constructor
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PathNodeIt() {}
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/// Invalid constructor
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PathNodeIt(Invalid)
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: _digraph(0), _it(INVALID), _nd(INVALID) {}
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/// Constructor
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PathNodeIt(const Digraph& digraph, const Path& path)
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: _digraph(&digraph), _it(path) {
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_nd = (_it != INVALID ? _digraph->source(_it) : INVALID);
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}
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/// Constructor
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PathNodeIt(const Digraph& digraph, const Path& path, const Node& src)
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: _digraph(&digraph), _it(path), _nd(src) {}
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///Conversion to Digraph::Node
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operator Node() const {
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return _nd;
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}
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/// Next node
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PathNodeIt& operator++() {
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if (_it == INVALID) _nd = INVALID;
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else {
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_nd = _digraph->target(_it);
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