[819] | 1 | // -*- c++ -*- // |
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| 2 | |
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| 3 | /** |
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| 4 | @defgroup paths Path Structures |
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| 5 | @ingroup datas |
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| 6 | \brief Path structures implemented in Hugo. |
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| 7 | |
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| 8 | Hugolib provides flexible data structures |
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| 9 | to work with paths. |
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| 10 | |
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| 11 | All of them have the same interface, especially they can be built or extended |
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| 12 | using a standard Builder subclass. This make is easy to have e.g. the Dijkstra |
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| 13 | algorithm to store its result in any kind of path structure. |
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| 14 | |
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| 15 | \sa hugo::skeleton::Path |
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| 16 | |
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| 17 | */ |
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| 18 | |
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| 19 | ///\ingroup paths |
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| 20 | ///\file |
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| 21 | ///\brief Classes for representing paths in graphs. |
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| 22 | |
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| 23 | #ifndef HUGO_PATH_H |
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| 24 | #define HUGO_PATH_H |
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| 25 | |
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| 26 | #include <deque> |
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| 27 | #include <vector> |
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| 28 | #include <algorithm> |
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| 29 | |
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| 30 | #include <hugo/invalid.h> |
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| 31 | #include <hugo/error.h> |
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[831] | 32 | //#include <hugo/debug.h> |
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[819] | 33 | |
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| 34 | namespace hugo { |
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| 35 | |
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| 36 | /// \addtogroup paths |
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| 37 | /// @{ |
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| 38 | |
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| 39 | |
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| 40 | //! \brief A structure for representing directed paths in a graph. |
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| 41 | //! |
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| 42 | //! A structure for representing directed path in a graph. |
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| 43 | //! \param Graph The graph type in which the path is. |
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| 44 | //! \param DM DebugMode, defaults to DefaultDebugMode. |
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| 45 | //! |
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| 46 | //! In a sense, the path can be treated as a graph, for is has \c NodeIt |
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| 47 | //! and \c EdgeIt with the same usage. These types converts to the \c Node |
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| 48 | //! and \c Edge of the original graph. |
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| 49 | //! |
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| 50 | //! \todo Thoroughfully check all the range and consistency tests. |
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[831] | 51 | template<typename Graph> |
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[819] | 52 | class DirPath { |
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| 53 | public: |
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| 54 | /// Edge type of the underlying graph. |
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| 55 | typedef typename Graph::Edge GraphEdge; |
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| 56 | /// Node type of the underlying graph. |
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| 57 | typedef typename Graph::Node GraphNode; |
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| 58 | class NodeIt; |
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| 59 | class EdgeIt; |
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| 60 | |
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| 61 | protected: |
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| 62 | const Graph *gr; |
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| 63 | typedef std::vector<GraphEdge> Container; |
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| 64 | Container edges; |
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| 65 | |
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| 66 | public: |
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| 67 | |
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| 68 | /// \param _G The graph in which the path is. |
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| 69 | /// |
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| 70 | DirPath(const Graph &_G) : gr(&_G) {} |
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| 71 | |
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| 72 | /// \brief Subpath constructor. |
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| 73 | /// |
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| 74 | /// Subpath defined by two nodes. |
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| 75 | /// \warning It is an error if the two edges are not in order! |
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| 76 | DirPath(const DirPath &P, const NodeIt &a, const NodeIt &b) { |
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[831] | 77 | if(!a.valid() || !b.valid) { |
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[819] | 78 | // FIXME: this check should be more elaborate... |
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| 79 | fault("DirPath, subpath ctor: invalid bounding nodes"); |
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| 80 | } |
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| 81 | gr = P.gr; |
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| 82 | edges.insert(edges.end(), P.edges.begin()+a.idx, P.edges.begin()+b.idx); |
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| 83 | } |
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| 84 | |
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| 85 | /// \brief Subpath constructor. |
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| 86 | /// |
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| 87 | /// Subpath defined by two edges. Contains edges in [a,b) |
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| 88 | /// \warning It is an error if the two edges are not in order! |
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| 89 | DirPath(const DirPath &P, const EdgeIt &a, const EdgeIt &b) { |
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[831] | 90 | if (!a.valid() || !b.valid) { |
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[819] | 91 | // FIXME: this check should be more elaborate... |
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| 92 | fault("DirPath, subpath ctor: invalid bounding nodes"); |
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| 93 | } |
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| 94 | gr = P.gr; |
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| 95 | edges.insert(edges.end(), P.edges.begin()+a.idx, P.edges.begin()+b.idx); |
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| 96 | } |
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| 97 | |
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| 98 | /// Length of the path. |
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| 99 | size_t length() const { return edges.size(); } |
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| 100 | /// Returns whether the path is empty. |
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| 101 | bool empty() const { return edges.empty(); } |
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| 102 | |
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| 103 | /// Resets the path to an empty path. |
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| 104 | void clear() { edges.clear(); } |
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| 105 | |
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| 106 | /// \brief Starting point of the path. |
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| 107 | /// |
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| 108 | /// Starting point of the path. |
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| 109 | /// Returns INVALID if the path is empty. |
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[831] | 110 | GraphNode tail() const { |
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[819] | 111 | return empty() ? INVALID : gr->tail(edges[0]); |
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| 112 | } |
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| 113 | /// \brief End point of the path. |
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| 114 | /// |
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| 115 | /// End point of the path. |
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| 116 | /// Returns INVALID if the path is empty. |
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[831] | 117 | GraphNode head() const { |
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[819] | 118 | return empty() ? INVALID : gr->head(edges[length()-1]); |
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| 119 | } |
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| 120 | |
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| 121 | /// \brief Initializes node or edge iterator to point to the first |
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| 122 | /// node or edge. |
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| 123 | /// |
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| 124 | /// \sa nth |
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| 125 | template<typename It> |
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| 126 | It& first(It &i) const { return i=It(*this); } |
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| 127 | |
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| 128 | /// \brief Initializes node iterator to point to the node of a given index. |
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| 129 | NodeIt& nth(NodeIt &i, int n) const { |
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[831] | 130 | if(n<0 || n>int(length())) |
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[819] | 131 | fault("DirPath::nth: index out of range"); |
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| 132 | return i=NodeIt(*this, n); |
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| 133 | } |
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| 134 | |
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| 135 | /// \brief Initializes edge iterator to point to the edge of a given index. |
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| 136 | EdgeIt& nth(EdgeIt &i, int n) const { |
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[831] | 137 | if(n<0 || n>=int(length())) |
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[819] | 138 | fault("DirPath::nth: index out of range"); |
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| 139 | return i=EdgeIt(*this, n); |
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| 140 | } |
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| 141 | |
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| 142 | /// Checks validity of a node or edge iterator. |
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| 143 | template<typename It> |
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| 144 | static |
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| 145 | bool valid(const It &i) { return i.valid(); } |
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| 146 | |
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| 147 | /// Steps the given node or edge iterator. |
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| 148 | template<typename It> |
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| 149 | static |
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| 150 | It& next(It &e) { |
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[831] | 151 | if( !e.valid() ) |
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[819] | 152 | fault("DirPath::next() on invalid iterator"); |
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| 153 | return ++e; |
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| 154 | } |
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| 155 | |
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| 156 | /// \brief Returns node iterator pointing to the head node of the |
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| 157 | /// given edge iterator. |
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| 158 | NodeIt head(const EdgeIt& e) const { |
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[831] | 159 | if( !e.valid() ) |
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[819] | 160 | fault("DirPath::head() on invalid iterator"); |
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| 161 | return NodeIt(*this, e.idx+1); |
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| 162 | } |
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| 163 | |
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| 164 | /// \brief Returns node iterator pointing to the tail node of the |
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| 165 | /// given edge iterator. |
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| 166 | NodeIt tail(const EdgeIt& e) const { |
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[831] | 167 | if( !e.valid() ) |
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[819] | 168 | fault("DirPath::tail() on invalid iterator"); |
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| 169 | return NodeIt(*this, e.idx); |
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| 170 | } |
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| 171 | |
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| 172 | |
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| 173 | /* Iterator classes */ |
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| 174 | |
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| 175 | /** |
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| 176 | * \brief Iterator class to iterate on the edges of the paths |
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| 177 | * |
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| 178 | * \ingroup paths |
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| 179 | * This class is used to iterate on the edges of the paths |
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| 180 | * |
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| 181 | * Of course it converts to Graph::Edge |
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| 182 | * |
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| 183 | * \todo Its interface differs from the standard edge iterator. |
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| 184 | * Yes, it shouldn't. |
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| 185 | */ |
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| 186 | class EdgeIt { |
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| 187 | friend class DirPath; |
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| 188 | |
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| 189 | int idx; |
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| 190 | const DirPath *p; |
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| 191 | public: |
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| 192 | /// Default constructor |
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| 193 | EdgeIt() {} |
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| 194 | /// Invalid constructor |
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| 195 | EdgeIt(Invalid) : idx(-1), p(0) {} |
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| 196 | /// Constructor with starting point |
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| 197 | EdgeIt(const DirPath &_p, int _idx = 0) : |
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| 198 | idx(_idx), p(&_p) { validate(); } |
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| 199 | |
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| 200 | ///Validity check |
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| 201 | bool valid() const { return idx!=-1; } |
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| 202 | |
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| 203 | ///Conversion to Graph::Edge |
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| 204 | operator GraphEdge () const { |
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| 205 | return valid() ? p->edges[idx] : INVALID; |
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| 206 | } |
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| 207 | |
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| 208 | /// Next edge |
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| 209 | EdgeIt& operator++() { ++idx; validate(); return *this; } |
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| 210 | |
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| 211 | /// Comparison operator |
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| 212 | bool operator==(const EdgeIt& e) const { return idx==e.idx; } |
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| 213 | /// Comparison operator |
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| 214 | bool operator!=(const EdgeIt& e) const { return idx!=e.idx; } |
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| 215 | /// Comparison operator |
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| 216 | bool operator<(const EdgeIt& e) const { return idx<e.idx; } |
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| 217 | |
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| 218 | private: |
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| 219 | // FIXME: comparison between signed and unsigned... |
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| 220 | // Jo ez igy? Vagy esetleg legyen a length() int? |
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| 221 | void validate() { if( size_t(idx) >= p->length() ) idx=-1; } |
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| 222 | }; |
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| 223 | |
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| 224 | /** |
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| 225 | * \brief Iterator class to iterate on the nodes of the paths |
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| 226 | * |
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| 227 | * \ingroup paths |
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| 228 | * This class is used to iterate on the nodes of the paths |
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| 229 | * |
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| 230 | * Of course it converts to Graph::Node |
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| 231 | * |
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| 232 | * \todo Its interface differs from the standard node iterator. |
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| 233 | * Yes, it shouldn't. |
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| 234 | */ |
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| 235 | class NodeIt { |
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| 236 | friend class DirPath; |
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| 237 | |
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| 238 | int idx; |
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| 239 | const DirPath *p; |
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| 240 | public: |
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| 241 | /// Default constructor |
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| 242 | NodeIt() {} |
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| 243 | /// Invalid constructor |
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| 244 | NodeIt(Invalid) : idx(-1), p(0) {} |
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| 245 | /// Constructor with starting point |
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| 246 | NodeIt(const DirPath &_p, int _idx = 0) : |
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| 247 | idx(_idx), p(&_p) { validate(); } |
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| 248 | |
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| 249 | ///Validity check |
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| 250 | bool valid() const { return idx!=-1; } |
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| 251 | |
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| 252 | ///Conversion to Graph::Node |
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| 253 | operator const GraphNode& () const { |
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| 254 | if(idx >= p->length()) |
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[831] | 255 | return p->head(); |
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[819] | 256 | else if(idx >= 0) |
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| 257 | return p->gr->tail(p->edges[idx]); |
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| 258 | else |
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| 259 | return INVALID; |
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| 260 | } |
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| 261 | /// Next node |
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| 262 | NodeIt& operator++() { ++idx; validate(); return *this; } |
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| 263 | |
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| 264 | /// Comparison operator |
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| 265 | bool operator==(const NodeIt& e) const { return idx==e.idx; } |
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| 266 | /// Comparison operator |
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| 267 | bool operator!=(const NodeIt& e) const { return idx!=e.idx; } |
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| 268 | /// Comparison operator |
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| 269 | bool operator<(const NodeIt& e) const { return idx<e.idx; } |
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| 270 | |
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| 271 | private: |
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| 272 | void validate() { if( size_t(idx) > p->length() ) idx=-1; } |
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| 273 | }; |
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| 274 | |
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| 275 | friend class Builder; |
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| 276 | |
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| 277 | /** |
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| 278 | * \brief Class to build paths |
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| 279 | * |
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| 280 | * \ingroup paths |
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| 281 | * This class is used to fill a path with edges. |
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| 282 | * |
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| 283 | * You can push new edges to the front and to the back of the path in |
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| 284 | * arbitrary order then you should commit these changes to the graph. |
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| 285 | * |
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| 286 | * Fundamentally, for most "Paths" (classes fulfilling the |
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| 287 | * PathConcept) while the builder is active (after the first modifying |
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| 288 | * operation and until the commit()) the original Path is in a |
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| 289 | * "transitional" state (operations on it have undefined result). But |
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| 290 | * in the case of DirPath the original path remains unchanged until the |
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| 291 | * commit. However we don't recomend that you use this feature. |
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| 292 | */ |
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| 293 | class Builder { |
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| 294 | DirPath &P; |
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| 295 | Container front, back; |
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| 296 | |
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| 297 | public: |
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| 298 | ///\param _P the path you want to fill in. |
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| 299 | /// |
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| 300 | Builder(DirPath &_P) : P(_P) {} |
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| 301 | |
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| 302 | /// Sets the starting node of the path. |
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| 303 | |
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| 304 | /// Sets the starting node of the path. Edge added to the path |
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| 305 | /// afterwards have to be incident to this node. |
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| 306 | /// It should be called iff the path is empty and before any call to |
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| 307 | /// \ref pushFront() or \ref pushBack() |
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| 308 | void setStartNode(const GraphNode &) {} |
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| 309 | |
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| 310 | ///Push a new edge to the front of the path |
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| 311 | |
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| 312 | ///Push a new edge to the front of the path. |
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| 313 | ///\sa setStartNode |
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| 314 | void pushFront(const GraphEdge& e) { |
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[831] | 315 | if( !empty() && P.gr->head(e)!=tail() ) { |
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[819] | 316 | fault("DirPath::Builder::pushFront: nonincident edge"); |
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| 317 | } |
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| 318 | front.push_back(e); |
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| 319 | } |
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| 320 | |
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| 321 | ///Push a new edge to the back of the path |
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| 322 | |
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| 323 | ///Push a new edge to the back of the path. |
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| 324 | ///\sa setStartNode |
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| 325 | void pushBack(const GraphEdge& e) { |
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[831] | 326 | if( !empty() && P.gr->tail(e)!=head() ) { |
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[819] | 327 | fault("DirPath::Builder::pushBack: nonincident edge"); |
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| 328 | } |
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| 329 | back.push_back(e); |
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| 330 | } |
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| 331 | |
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| 332 | ///Commit the changes to the path. |
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| 333 | void commit() { |
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| 334 | if( !(front.empty() && back.empty()) ) { |
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| 335 | Container tmp; |
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| 336 | tmp.reserve(front.size()+back.size()+P.length()); |
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| 337 | tmp.insert(tmp.end(), front.rbegin(), front.rend()); |
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| 338 | tmp.insert(tmp.end(), P.edges.begin(), P.edges.end()); |
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| 339 | tmp.insert(tmp.end(), back.begin(), back.end()); |
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| 340 | P.edges.swap(tmp); |
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| 341 | front.clear(); |
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| 342 | back.clear(); |
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| 343 | } |
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| 344 | } |
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| 345 | |
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| 346 | // FIXME: Hmm, pontosan hogy is kene ezt csinalni? |
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| 347 | // Hogy kenyelmes egy ilyet hasznalni? |
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| 348 | |
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| 349 | ///Reserve storage for the builder in advance. |
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| 350 | |
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| 351 | ///If you know an reasonable upper bound of the number of the edges |
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| 352 | ///to add, using this function you can speed up the building. |
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| 353 | void reserve(size_t r) { |
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| 354 | front.reserve(r); |
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| 355 | back.reserve(r); |
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| 356 | } |
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| 357 | |
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[831] | 358 | void reserveFront(size_t r) {} |
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| 359 | void reserveBack(size_t r) {} |
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| 360 | |
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[819] | 361 | private: |
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| 362 | bool empty() { |
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| 363 | return front.empty() && back.empty() && P.empty(); |
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| 364 | } |
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| 365 | |
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[831] | 366 | GraphNode tail() const { |
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[819] | 367 | if( ! front.empty() ) |
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| 368 | return P.gr->tail(front[front.size()-1]); |
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| 369 | else if( ! P.empty() ) |
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| 370 | return P.gr->tail(P.edges[0]); |
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| 371 | else if( ! back.empty() ) |
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| 372 | return P.gr->tail(back[0]); |
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| 373 | else |
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| 374 | return INVALID; |
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| 375 | } |
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[831] | 376 | GraphNode head() const { |
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[819] | 377 | if( ! back.empty() ) |
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| 378 | return P.gr->head(back[back.size()-1]); |
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| 379 | else if( ! P.empty() ) |
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| 380 | return P.gr->head(P.edges[P.length()-1]); |
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| 381 | else if( ! front.empty() ) |
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| 382 | return P.gr->head(front[0]); |
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| 383 | else |
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| 384 | return INVALID; |
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| 385 | } |
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| 386 | |
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| 387 | }; |
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| 388 | |
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| 389 | }; |
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| 390 | |
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| 391 | |
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| 392 | |
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| 393 | |
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| 394 | |
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| 395 | |
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| 396 | |
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| 397 | |
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| 398 | |
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| 399 | |
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| 400 | /**********************************************************************/ |
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| 401 | |
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| 402 | |
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| 403 | //! \brief A structure for representing undirected path in a graph. |
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| 404 | //! |
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| 405 | //! A structure for representing undirected path in a graph. Ie. this is |
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| 406 | //! a path in a \e directed graph but the edges should not be directed |
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| 407 | //! forward. |
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| 408 | //! |
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| 409 | //! \param Graph The graph type in which the path is. |
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| 410 | //! \param DM DebugMode, defaults to DefaultDebugMode. |
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| 411 | //! |
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| 412 | //! In a sense, the path can be treated as a graph, for is has \c NodeIt |
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| 413 | //! and \c EdgeIt with the same usage. These types converts to the \c Node |
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| 414 | //! and \c Edge of the original graph. |
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| 415 | //! |
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| 416 | //! \todo Thoroughfully check all the range and consistency tests. |
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[831] | 417 | template<typename Graph> |
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[819] | 418 | class UndirPath { |
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| 419 | public: |
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| 420 | /// Edge type of the underlying graph. |
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| 421 | typedef typename Graph::Edge GraphEdge; |
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| 422 | /// Node type of the underlying graph. |
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| 423 | typedef typename Graph::Node GraphNode; |
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| 424 | class NodeIt; |
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| 425 | class EdgeIt; |
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| 426 | |
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| 427 | protected: |
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| 428 | const Graph *gr; |
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| 429 | typedef std::vector<GraphEdge> Container; |
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| 430 | Container edges; |
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| 431 | |
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| 432 | public: |
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| 433 | |
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| 434 | /// \param _G The graph in which the path is. |
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| 435 | /// |
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| 436 | UndirPath(const Graph &_G) : gr(&_G) {} |
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| 437 | |
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| 438 | /// \brief Subpath constructor. |
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| 439 | /// |
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| 440 | /// Subpath defined by two nodes. |
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| 441 | /// \warning It is an error if the two edges are not in order! |
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| 442 | UndirPath(const UndirPath &P, const NodeIt &a, const NodeIt &b) { |
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[831] | 443 | if(!a.valid() || !b.valid) { |
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[819] | 444 | // FIXME: this check should be more elaborate... |
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| 445 | fault("UndirPath, subpath ctor: invalid bounding nodes"); |
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| 446 | } |
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| 447 | gr = P.gr; |
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| 448 | edges.insert(edges.end(), P.edges.begin()+a.idx, P.edges.begin()+b.idx); |
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| 449 | } |
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| 450 | |
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| 451 | /// \brief Subpath constructor. |
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| 452 | /// |
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| 453 | /// Subpath defined by two edges. Contains edges in [a,b) |
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| 454 | /// \warning It is an error if the two edges are not in order! |
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| 455 | UndirPath(const UndirPath &P, const EdgeIt &a, const EdgeIt &b) { |
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[831] | 456 | if(!a.valid() || !b.valid) { |
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[819] | 457 | // FIXME: this check should be more elaborate... |
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| 458 | fault("UndirPath, subpath ctor: invalid bounding nodes"); |
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| 459 | } |
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| 460 | gr = P.gr; |
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| 461 | edges.insert(edges.end(), P.edges.begin()+a.idx, P.edges.begin()+b.idx); |
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| 462 | } |
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| 463 | |
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| 464 | /// Length of the path. |
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| 465 | size_t length() const { return edges.size(); } |
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| 466 | /// Returns whether the path is empty. |
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| 467 | bool empty() const { return edges.empty(); } |
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| 468 | |
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| 469 | /// Resets the path to an empty path. |
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| 470 | void clear() { edges.clear(); } |
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| 471 | |
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| 472 | /// \brief Starting point of the path. |
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| 473 | /// |
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| 474 | /// Starting point of the path. |
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| 475 | /// Returns INVALID if the path is empty. |
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[831] | 476 | GraphNode tail() const { |
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[819] | 477 | return empty() ? INVALID : gr->tail(edges[0]); |
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| 478 | } |
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| 479 | /// \brief End point of the path. |
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| 480 | /// |
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| 481 | /// End point of the path. |
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| 482 | /// Returns INVALID if the path is empty. |
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[831] | 483 | GraphNode head() const { |
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[819] | 484 | return empty() ? INVALID : gr->head(edges[length()-1]); |
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| 485 | } |
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| 486 | |
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| 487 | /// \brief Initializes node or edge iterator to point to the first |
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| 488 | /// node or edge. |
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| 489 | /// |
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| 490 | /// \sa nth |
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| 491 | template<typename It> |
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| 492 | It& first(It &i) const { return i=It(*this); } |
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| 493 | |
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| 494 | /// \brief Initializes node iterator to point to the node of a given index. |
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| 495 | NodeIt& nth(NodeIt &i, int n) const { |
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[831] | 496 | if(n<0 || n>int(length())) |
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[819] | 497 | fault("UndirPath::nth: index out of range"); |
---|
| 498 | return i=NodeIt(*this, n); |
---|
| 499 | } |
---|
| 500 | |
---|
| 501 | /// \brief Initializes edge iterator to point to the edge of a given index. |
---|
| 502 | EdgeIt& nth(EdgeIt &i, int n) const { |
---|
[831] | 503 | if(n<0 || n>=int(length())) |
---|
[819] | 504 | fault("UndirPath::nth: index out of range"); |
---|
| 505 | return i=EdgeIt(*this, n); |
---|
| 506 | } |
---|
| 507 | |
---|
| 508 | /// Checks validity of a node or edge iterator. |
---|
| 509 | template<typename It> |
---|
| 510 | static |
---|
| 511 | bool valid(const It &i) { return i.valid(); } |
---|
| 512 | |
---|
| 513 | /// Steps the given node or edge iterator. |
---|
| 514 | template<typename It> |
---|
| 515 | static |
---|
| 516 | It& next(It &e) { |
---|
[831] | 517 | if( !e.valid() ) |
---|
[819] | 518 | fault("UndirPath::next() on invalid iterator"); |
---|
| 519 | return ++e; |
---|
| 520 | } |
---|
| 521 | |
---|
| 522 | /// \brief Returns node iterator pointing to the head node of the |
---|
| 523 | /// given edge iterator. |
---|
| 524 | NodeIt head(const EdgeIt& e) const { |
---|
[831] | 525 | if( !e.valid() ) |
---|
[819] | 526 | fault("UndirPath::head() on invalid iterator"); |
---|
| 527 | return NodeIt(*this, e.idx+1); |
---|
| 528 | } |
---|
| 529 | |
---|
| 530 | /// \brief Returns node iterator pointing to the tail node of the |
---|
| 531 | /// given edge iterator. |
---|
| 532 | NodeIt tail(const EdgeIt& e) const { |
---|
[831] | 533 | if( !e.valid() ) |
---|
[819] | 534 | fault("UndirPath::tail() on invalid iterator"); |
---|
| 535 | return NodeIt(*this, e.idx); |
---|
| 536 | } |
---|
| 537 | |
---|
| 538 | |
---|
| 539 | |
---|
| 540 | /** |
---|
| 541 | * \brief Iterator class to iterate on the edges of the paths |
---|
| 542 | * |
---|
| 543 | * \ingroup paths |
---|
| 544 | * This class is used to iterate on the edges of the paths |
---|
| 545 | * |
---|
| 546 | * Of course it converts to Graph::Edge |
---|
| 547 | * |
---|
| 548 | * \todo Its interface differs from the standard edge iterator. |
---|
| 549 | * Yes, it shouldn't. |
---|
| 550 | */ |
---|
| 551 | class EdgeIt { |
---|
| 552 | friend class UndirPath; |
---|
| 553 | |
---|
| 554 | int idx; |
---|
| 555 | const UndirPath *p; |
---|
| 556 | public: |
---|
| 557 | /// Default constructor |
---|
| 558 | EdgeIt() {} |
---|
| 559 | /// Invalid constructor |
---|
| 560 | EdgeIt(Invalid) : idx(-1), p(0) {} |
---|
| 561 | /// Constructor with starting point |
---|
| 562 | EdgeIt(const UndirPath &_p, int _idx = 0) : |
---|
| 563 | idx(_idx), p(&_p) { validate(); } |
---|
| 564 | |
---|
| 565 | ///Validity check |
---|
| 566 | bool valid() const { return idx!=-1; } |
---|
| 567 | |
---|
| 568 | ///Conversion to Graph::Edge |
---|
| 569 | operator GraphEdge () const { |
---|
| 570 | return valid() ? p->edges[idx] : INVALID; |
---|
| 571 | } |
---|
| 572 | /// Next edge |
---|
| 573 | EdgeIt& operator++() { ++idx; validate(); return *this; } |
---|
| 574 | |
---|
| 575 | /// Comparison operator |
---|
| 576 | bool operator==(const EdgeIt& e) const { return idx==e.idx; } |
---|
| 577 | /// Comparison operator |
---|
| 578 | bool operator!=(const EdgeIt& e) const { return idx!=e.idx; } |
---|
| 579 | /// Comparison operator |
---|
| 580 | bool operator<(const EdgeIt& e) const { return idx<e.idx; } |
---|
| 581 | |
---|
| 582 | private: |
---|
| 583 | // FIXME: comparison between signed and unsigned... |
---|
| 584 | // Jo ez igy? Vagy esetleg legyen a length() int? |
---|
| 585 | void validate() { if( size_t(idx) >= p->length() ) idx=-1; } |
---|
| 586 | }; |
---|
| 587 | |
---|
| 588 | /** |
---|
| 589 | * \brief Iterator class to iterate on the nodes of the paths |
---|
| 590 | * |
---|
| 591 | * \ingroup paths |
---|
| 592 | * This class is used to iterate on the nodes of the paths |
---|
| 593 | * |
---|
| 594 | * Of course it converts to Graph::Node |
---|
| 595 | * |
---|
| 596 | * \todo Its interface differs from the standard node iterator. |
---|
| 597 | * Yes, it shouldn't. |
---|
| 598 | */ |
---|
| 599 | class NodeIt { |
---|
| 600 | friend class UndirPath; |
---|
| 601 | |
---|
| 602 | int idx; |
---|
| 603 | const UndirPath *p; |
---|
| 604 | public: |
---|
| 605 | /// Default constructor |
---|
| 606 | NodeIt() {} |
---|
| 607 | /// Invalid constructor |
---|
| 608 | NodeIt(Invalid) : idx(-1), p(0) {} |
---|
| 609 | /// Constructor with starting point |
---|
| 610 | NodeIt(const UndirPath &_p, int _idx = 0) : |
---|
| 611 | idx(_idx), p(&_p) { validate(); } |
---|
| 612 | |
---|
| 613 | ///Validity check |
---|
| 614 | bool valid() const { return idx!=-1; } |
---|
| 615 | |
---|
| 616 | ///Conversion to Graph::Node |
---|
| 617 | operator const GraphNode& () const { |
---|
| 618 | if(idx >= p->length()) |
---|
[831] | 619 | return p->head(); |
---|
[819] | 620 | else if(idx >= 0) |
---|
| 621 | return p->gr->tail(p->edges[idx]); |
---|
| 622 | else |
---|
| 623 | return INVALID; |
---|
| 624 | } |
---|
| 625 | /// Next node |
---|
| 626 | NodeIt& operator++() { ++idx; validate(); return *this; } |
---|
| 627 | |
---|
| 628 | /// Comparison operator |
---|
| 629 | bool operator==(const NodeIt& e) const { return idx==e.idx; } |
---|
| 630 | /// Comparison operator |
---|
| 631 | bool operator!=(const NodeIt& e) const { return idx!=e.idx; } |
---|
| 632 | /// Comparison operator |
---|
| 633 | bool operator<(const NodeIt& e) const { return idx<e.idx; } |
---|
| 634 | |
---|
| 635 | private: |
---|
| 636 | void validate() { if( size_t(idx) > p->length() ) idx=-1; } |
---|
| 637 | }; |
---|
| 638 | |
---|
| 639 | friend class Builder; |
---|
| 640 | |
---|
| 641 | /** |
---|
| 642 | * \brief Class to build paths |
---|
| 643 | * |
---|
| 644 | * \ingroup paths |
---|
| 645 | * This class is used to fill a path with edges. |
---|
| 646 | * |
---|
| 647 | * You can push new edges to the front and to the back of the path in |
---|
| 648 | * arbitrary order then you should commit these changes to the graph. |
---|
| 649 | * |
---|
| 650 | * Fundamentally, for most "Paths" (classes fulfilling the |
---|
| 651 | * PathConcept) while the builder is active (after the first modifying |
---|
| 652 | * operation and until the commit()) the original Path is in a |
---|
| 653 | * "transitional" state (operations ot it have undefined result). But |
---|
| 654 | * in the case of UndirPath the original path is unchanged until the |
---|
| 655 | * commit. However we don't recomend that you use this feature. |
---|
| 656 | */ |
---|
| 657 | class Builder { |
---|
| 658 | UndirPath &P; |
---|
| 659 | Container front, back; |
---|
| 660 | |
---|
| 661 | public: |
---|
| 662 | ///\param _P the path you want to fill in. |
---|
| 663 | /// |
---|
| 664 | Builder(UndirPath &_P) : P(_P) {} |
---|
| 665 | |
---|
| 666 | /// Sets the starting node of the path. |
---|
| 667 | |
---|
| 668 | /// Sets the starting node of the path. Edge added to the path |
---|
| 669 | /// afterwards have to be incident to this node. |
---|
| 670 | /// It should be called iff the path is empty and before any call to |
---|
| 671 | /// \ref pushFront() or \ref pushBack() |
---|
| 672 | void setStartNode(const GraphNode &) {} |
---|
| 673 | |
---|
| 674 | ///Push a new edge to the front of the path |
---|
| 675 | |
---|
| 676 | ///Push a new edge to the front of the path. |
---|
| 677 | ///\sa setStartNode |
---|
| 678 | void pushFront(const GraphEdge& e) { |
---|
[831] | 679 | if( !empty() && P.gr->head(e)!=tail() ) { |
---|
[819] | 680 | fault("UndirPath::Builder::pushFront: nonincident edge"); |
---|
| 681 | } |
---|
| 682 | front.push_back(e); |
---|
| 683 | } |
---|
| 684 | |
---|
| 685 | ///Push a new edge to the back of the path |
---|
| 686 | |
---|
| 687 | ///Push a new edge to the back of the path. |
---|
| 688 | ///\sa setStartNode |
---|
| 689 | void pushBack(const GraphEdge& e) { |
---|
[831] | 690 | if( !empty() && P.gr->tail(e)!=head() ) { |
---|
[819] | 691 | fault("UndirPath::Builder::pushBack: nonincident edge"); |
---|
| 692 | } |
---|
| 693 | back.push_back(e); |
---|
| 694 | } |
---|
| 695 | |
---|
| 696 | ///Commit the changes to the path. |
---|
| 697 | void commit() { |
---|
| 698 | if( !(front.empty() && back.empty()) ) { |
---|
| 699 | Container tmp; |
---|
| 700 | tmp.reserve(front.size()+back.size()+P.length()); |
---|
| 701 | tmp.insert(tmp.end(), front.rbegin(), front.rend()); |
---|
| 702 | tmp.insert(tmp.end(), P.edges.begin(), P.edges.end()); |
---|
| 703 | tmp.insert(tmp.end(), back.begin(), back.end()); |
---|
| 704 | P.edges.swap(tmp); |
---|
| 705 | front.clear(); |
---|
| 706 | back.clear(); |
---|
| 707 | } |
---|
| 708 | } |
---|
| 709 | |
---|
| 710 | // FIXME: Hmm, pontosan hogy is kene ezt csinalni? |
---|
| 711 | // Hogy kenyelmes egy ilyet hasznalni? |
---|
| 712 | |
---|
| 713 | ///Reserve storage for the builder in advance. |
---|
| 714 | |
---|
| 715 | ///If you know an reasonable upper bound of the number of the edges |
---|
| 716 | ///to add, using this function you can speed up the building. |
---|
| 717 | void reserve(size_t r) { |
---|
| 718 | front.reserve(r); |
---|
| 719 | back.reserve(r); |
---|
| 720 | } |
---|
| 721 | |
---|
[831] | 722 | void reserveFront(size_t r) {} |
---|
| 723 | void reserveBack(size_t r) {} |
---|
| 724 | |
---|
[819] | 725 | private: |
---|
| 726 | bool empty() { |
---|
| 727 | return front.empty() && back.empty() && P.empty(); |
---|
| 728 | } |
---|
| 729 | |
---|
[831] | 730 | GraphNode tail() const { |
---|
[819] | 731 | if( ! front.empty() ) |
---|
| 732 | return P.gr->tail(front[front.size()-1]); |
---|
| 733 | else if( ! P.empty() ) |
---|
| 734 | return P.gr->tail(P.edges[0]); |
---|
| 735 | else if( ! back.empty() ) |
---|
| 736 | return P.gr->tail(back[0]); |
---|
| 737 | else |
---|
| 738 | return INVALID; |
---|
| 739 | } |
---|
[831] | 740 | GraphNode head() const { |
---|
[819] | 741 | if( ! back.empty() ) |
---|
| 742 | return P.gr->head(back[back.size()-1]); |
---|
| 743 | else if( ! P.empty() ) |
---|
| 744 | return P.gr->head(P.edges[P.length()-1]); |
---|
| 745 | else if( ! front.empty() ) |
---|
| 746 | return P.gr->head(front[0]); |
---|
| 747 | else |
---|
| 748 | return INVALID; |
---|
| 749 | } |
---|
| 750 | |
---|
| 751 | }; |
---|
| 752 | |
---|
| 753 | }; |
---|
| 754 | |
---|
| 755 | |
---|
| 756 | |
---|
| 757 | |
---|
| 758 | |
---|
| 759 | |
---|
| 760 | |
---|
| 761 | |
---|
| 762 | |
---|
| 763 | |
---|
| 764 | /**********************************************************************/ |
---|
| 765 | |
---|
| 766 | |
---|
| 767 | /* Ennek az allocatorosdinak sokkal jobban utana kene nezni a hasznalata |
---|
| 768 | elott. Eleg bonyinak nez ki, ahogyan azokat az STL-ben hasznaljak. */ |
---|
| 769 | |
---|
| 770 | template<typename Graph> |
---|
| 771 | class DynamicPath { |
---|
| 772 | |
---|
| 773 | public: |
---|
| 774 | typedef typename Graph::Edge GraphEdge; |
---|
| 775 | typedef typename Graph::Node GraphNode; |
---|
| 776 | class NodeIt; |
---|
| 777 | class EdgeIt; |
---|
| 778 | |
---|
| 779 | protected: |
---|
| 780 | Graph& G; |
---|
| 781 | // FIXME: ehelyett eleg lenne tarolni ket boolt: a ket szelso el |
---|
| 782 | // iranyitasat: |
---|
| 783 | GraphNode _first, _last; |
---|
| 784 | typedef std::deque<GraphEdge> Container; |
---|
| 785 | Container edges; |
---|
| 786 | |
---|
| 787 | public: |
---|
| 788 | |
---|
| 789 | DynamicPath(Graph &_G) : G(_G), _first(INVALID), _last(INVALID) {} |
---|
| 790 | |
---|
| 791 | /// Subpath defined by two nodes. |
---|
| 792 | /// Nodes may be in reversed order, then |
---|
| 793 | /// we contstruct the reversed path. |
---|
| 794 | DynamicPath(const DynamicPath &P, const NodeIt &a, const NodeIt &b); |
---|
| 795 | /// Subpath defined by two edges. Contains edges in [a,b) |
---|
| 796 | /// It is an error if the two edges are not in order! |
---|
| 797 | DynamicPath(const DynamicPath &P, const EdgeIt &a, const EdgeIt &b); |
---|
| 798 | |
---|
| 799 | size_t length() const { return edges.size(); } |
---|
[831] | 800 | GraphNode tail() const { return _first; } |
---|
| 801 | GraphNode head() const { return _last; } |
---|
[819] | 802 | |
---|
| 803 | NodeIt& first(NodeIt &n) const { return nth(n, 0); } |
---|
| 804 | EdgeIt& first(EdgeIt &e) const { return nth(e, 0); } |
---|
| 805 | template<typename It> |
---|
| 806 | It first() const { |
---|
| 807 | It e; |
---|
| 808 | first(e); |
---|
| 809 | return e; |
---|
| 810 | } |
---|
| 811 | |
---|
| 812 | NodeIt& nth(NodeIt &, size_t) const; |
---|
| 813 | EdgeIt& nth(EdgeIt &, size_t) const; |
---|
| 814 | template<typename It> |
---|
| 815 | It nth(size_t n) const { |
---|
| 816 | It e; |
---|
| 817 | nth(e, n); |
---|
| 818 | return e; |
---|
| 819 | } |
---|
| 820 | |
---|
| 821 | bool valid(const NodeIt &n) const { return n.idx <= length(); } |
---|
| 822 | bool valid(const EdgeIt &e) const { return e.it < edges.end(); } |
---|
| 823 | |
---|
| 824 | bool isForward(const EdgeIt &e) const { return e.forw; } |
---|
| 825 | |
---|
| 826 | /// index of a node on the path. Returns length+2 for the invalid NodeIt |
---|
| 827 | int index(const NodeIt &n) const { return n.idx; } |
---|
| 828 | /// index of an edge on the path. Returns length+1 for the invalid EdgeIt |
---|
| 829 | int index(const EdgeIt &e) const { return e.it - edges.begin(); } |
---|
| 830 | |
---|
| 831 | EdgeIt& next(EdgeIt &e) const; |
---|
| 832 | NodeIt& next(NodeIt &n) const; |
---|
| 833 | template <typename It> |
---|
| 834 | It getNext(It it) const { |
---|
| 835 | It tmp(it); return next(tmp); |
---|
| 836 | } |
---|
| 837 | |
---|
| 838 | // A path is constructed using the following four functions. |
---|
| 839 | // They return false if the requested operation is inconsistent |
---|
| 840 | // with the path constructed so far. |
---|
| 841 | // If your path has only one edge you MUST set either "from" or "to"! |
---|
| 842 | // So you probably SHOULD call it in any case to be safe (and check the |
---|
| 843 | // returned value to check if your path is consistent with your idea). |
---|
| 844 | bool pushFront(const GraphEdge &e); |
---|
| 845 | bool pushBack(const GraphEdge &e); |
---|
| 846 | bool setFrom(const GraphNode &n); |
---|
| 847 | bool setTo(const GraphNode &n); |
---|
| 848 | |
---|
| 849 | // WARNING: these two functions return the head/tail of an edge with |
---|
| 850 | // respect to the direction of the path! |
---|
| 851 | // So G.head(P.graphEdge(e)) == P.graphNode(P.head(e)) holds only if |
---|
| 852 | // P.forward(e) is true (or the edge is a loop)! |
---|
| 853 | NodeIt head(const EdgeIt& e) const; |
---|
| 854 | NodeIt tail(const EdgeIt& e) const; |
---|
| 855 | |
---|
| 856 | // FIXME: ezeknek valami jobb nev kellene!!! |
---|
| 857 | GraphEdge graphEdge(const EdgeIt& e) const; |
---|
| 858 | GraphNode graphNode(const NodeIt& n) const; |
---|
| 859 | |
---|
| 860 | |
---|
| 861 | /*** Iterator classes ***/ |
---|
| 862 | class EdgeIt { |
---|
| 863 | friend class DynamicPath; |
---|
| 864 | |
---|
| 865 | typename Container::const_iterator it; |
---|
| 866 | bool forw; |
---|
| 867 | public: |
---|
| 868 | // FIXME: jarna neki ilyen is... |
---|
| 869 | // EdgeIt(Invalid); |
---|
| 870 | |
---|
| 871 | bool forward() const { return forw; } |
---|
| 872 | |
---|
| 873 | bool operator==(const EdgeIt& e) const { return it==e.it; } |
---|
| 874 | bool operator!=(const EdgeIt& e) const { return it!=e.it; } |
---|
| 875 | bool operator<(const EdgeIt& e) const { return it<e.it; } |
---|
| 876 | }; |
---|
| 877 | |
---|
| 878 | class NodeIt { |
---|
| 879 | friend class DynamicPath; |
---|
| 880 | |
---|
| 881 | size_t idx; |
---|
| 882 | bool tail; // Is this node the tail of the edge with same idx? |
---|
| 883 | |
---|
| 884 | public: |
---|
| 885 | // FIXME: jarna neki ilyen is... |
---|
| 886 | // NodeIt(Invalid); |
---|
| 887 | |
---|
| 888 | bool operator==(const NodeIt& n) const { return idx==n.idx; } |
---|
| 889 | bool operator!=(const NodeIt& n) const { return idx!=n.idx; } |
---|
| 890 | bool operator<(const NodeIt& n) const { return idx<n.idx; } |
---|
| 891 | }; |
---|
| 892 | |
---|
| 893 | private: |
---|
| 894 | bool edgeIncident(const GraphEdge &e, const GraphNode &a, |
---|
| 895 | GraphNode &b); |
---|
| 896 | bool connectTwoEdges(const GraphEdge &e, const GraphEdge &f); |
---|
| 897 | }; |
---|
| 898 | |
---|
| 899 | template<typename Gr> |
---|
| 900 | typename DynamicPath<Gr>::EdgeIt& |
---|
| 901 | DynamicPath<Gr>::next(DynamicPath::EdgeIt &e) const { |
---|
| 902 | if( e.it == edges.end() ) |
---|
| 903 | return e; |
---|
| 904 | |
---|
| 905 | GraphNode common_node = ( e.forw ? G.head(*e.it) : G.tail(*e.it) ); |
---|
| 906 | ++e.it; |
---|
| 907 | |
---|
| 908 | // Invalid edgeit is always forward :) |
---|
| 909 | if( e.it == edges.end() ) { |
---|
| 910 | e.forw = true; |
---|
| 911 | return e; |
---|
| 912 | } |
---|
| 913 | |
---|
| 914 | e.forw = ( G.tail(*e.it) == common_node ); |
---|
| 915 | return e; |
---|
| 916 | } |
---|
| 917 | |
---|
| 918 | template<typename Gr> |
---|
| 919 | typename DynamicPath<Gr>::NodeIt& DynamicPath<Gr>::next(NodeIt &n) const { |
---|
| 920 | if( n.idx >= length() ) { |
---|
| 921 | // FIXME: invalid |
---|
| 922 | n.idx = length()+1; |
---|
| 923 | return n; |
---|
| 924 | } |
---|
| 925 | |
---|
| 926 | |
---|
| 927 | GraphNode next_node = ( n.tail ? G.head(edges[n.idx]) : |
---|
| 928 | G.tail(edges[n.idx]) ); |
---|
| 929 | ++n.idx; |
---|
| 930 | if( n.idx < length() ) { |
---|
| 931 | n.tail = ( next_node == G.tail(edges[n.idx]) ); |
---|
| 932 | } |
---|
| 933 | else { |
---|
| 934 | n.tail = true; |
---|
| 935 | } |
---|
| 936 | |
---|
| 937 | return n; |
---|
| 938 | } |
---|
| 939 | |
---|
| 940 | template<typename Gr> |
---|
| 941 | bool DynamicPath<Gr>::edgeIncident(const GraphEdge &e, const GraphNode &a, |
---|
| 942 | GraphNode &b) { |
---|
| 943 | if( G.tail(e) == a ) { |
---|
| 944 | b=G.head(e); |
---|
| 945 | return true; |
---|
| 946 | } |
---|
| 947 | if( G.head(e) == a ) { |
---|
| 948 | b=G.tail(e); |
---|
| 949 | return true; |
---|
| 950 | } |
---|
| 951 | return false; |
---|
| 952 | } |
---|
| 953 | |
---|
| 954 | template<typename Gr> |
---|
| 955 | bool DynamicPath<Gr>::connectTwoEdges(const GraphEdge &e, |
---|
| 956 | const GraphEdge &f) { |
---|
| 957 | if( edgeIncident(f, G.tail(e), _last) ) { |
---|
| 958 | _first = G.head(e); |
---|
| 959 | return true; |
---|
| 960 | } |
---|
| 961 | if( edgeIncident(f, G.head(e), _last) ) { |
---|
| 962 | _first = G.tail(e); |
---|
| 963 | return true; |
---|
| 964 | } |
---|
| 965 | return false; |
---|
| 966 | } |
---|
| 967 | |
---|
| 968 | template<typename Gr> |
---|
| 969 | bool DynamicPath<Gr>::pushFront(const GraphEdge &e) { |
---|
| 970 | if( G.valid(_first) ) { |
---|
| 971 | if( edgeIncident(e, _first, _first) ) { |
---|
| 972 | edges.push_front(e); |
---|
| 973 | return true; |
---|
| 974 | } |
---|
| 975 | else |
---|
| 976 | return false; |
---|
| 977 | } |
---|
| 978 | else if( length() < 1 || connectTwoEdges(e, edges[0]) ) { |
---|
| 979 | edges.push_front(e); |
---|
| 980 | return true; |
---|
| 981 | } |
---|
| 982 | else |
---|
| 983 | return false; |
---|
| 984 | } |
---|
| 985 | |
---|
| 986 | template<typename Gr> |
---|
| 987 | bool DynamicPath<Gr>::pushBack(const GraphEdge &e) { |
---|
| 988 | if( G.valid(_last) ) { |
---|
| 989 | if( edgeIncident(e, _last, _last) ) { |
---|
| 990 | edges.push_back(e); |
---|
| 991 | return true; |
---|
| 992 | } |
---|
| 993 | else |
---|
| 994 | return false; |
---|
| 995 | } |
---|
| 996 | else if( length() < 1 || connectTwoEdges(edges[0], e) ) { |
---|
| 997 | edges.push_back(e); |
---|
| 998 | return true; |
---|
| 999 | } |
---|
| 1000 | else |
---|
| 1001 | return false; |
---|
| 1002 | } |
---|
| 1003 | |
---|
| 1004 | |
---|
| 1005 | template<typename Gr> |
---|
| 1006 | bool DynamicPath<Gr>::setFrom(const GraphNode &n) { |
---|
| 1007 | if( G.valid(_first) ) { |
---|
| 1008 | return _first == n; |
---|
| 1009 | } |
---|
| 1010 | else { |
---|
| 1011 | if( length() > 0) { |
---|
| 1012 | if( edgeIncident(edges[0], n, _last) ) { |
---|
| 1013 | _first = n; |
---|
| 1014 | return true; |
---|
| 1015 | } |
---|
| 1016 | else return false; |
---|
| 1017 | } |
---|
| 1018 | else { |
---|
| 1019 | _first = _last = n; |
---|
| 1020 | return true; |
---|
| 1021 | } |
---|
| 1022 | } |
---|
| 1023 | } |
---|
| 1024 | |
---|
| 1025 | template<typename Gr> |
---|
| 1026 | bool DynamicPath<Gr>::setTo(const GraphNode &n) { |
---|
| 1027 | if( G.valid(_last) ) { |
---|
| 1028 | return _last == n; |
---|
| 1029 | } |
---|
| 1030 | else { |
---|
| 1031 | if( length() > 0) { |
---|
| 1032 | if( edgeIncident(edges[0], n, _first) ) { |
---|
| 1033 | _last = n; |
---|
| 1034 | return true; |
---|
| 1035 | } |
---|
| 1036 | else return false; |
---|
| 1037 | } |
---|
| 1038 | else { |
---|
| 1039 | _first = _last = n; |
---|
| 1040 | return true; |
---|
| 1041 | } |
---|
| 1042 | } |
---|
| 1043 | } |
---|
| 1044 | |
---|
| 1045 | |
---|
| 1046 | template<typename Gr> |
---|
| 1047 | typename DynamicPath<Gr>::NodeIt |
---|
| 1048 | DynamicPath<Gr>::tail(const EdgeIt& e) const { |
---|
| 1049 | NodeIt n; |
---|
| 1050 | |
---|
| 1051 | if( e.it == edges.end() ) { |
---|
| 1052 | // FIXME: invalid-> invalid |
---|
| 1053 | n.idx = length() + 1; |
---|
| 1054 | n.tail = true; |
---|
| 1055 | return n; |
---|
| 1056 | } |
---|
| 1057 | |
---|
| 1058 | n.idx = e.it-edges.begin(); |
---|
| 1059 | n.tail = e.forw; |
---|
| 1060 | return n; |
---|
| 1061 | } |
---|
| 1062 | |
---|
| 1063 | template<typename Gr> |
---|
| 1064 | typename DynamicPath<Gr>::NodeIt |
---|
| 1065 | DynamicPath<Gr>::head(const EdgeIt& e) const { |
---|
| 1066 | if( e.it == edges.end()-1 ) { |
---|
| 1067 | return _last; |
---|
| 1068 | } |
---|
| 1069 | |
---|
| 1070 | EdgeIt next_edge = e; |
---|
| 1071 | next(next_edge); |
---|
| 1072 | return tail(next_edge); |
---|
| 1073 | } |
---|
| 1074 | |
---|
| 1075 | template<typename Gr> |
---|
| 1076 | typename DynamicPath<Gr>::GraphEdge |
---|
| 1077 | DynamicPath<Gr>::graphEdge(const EdgeIt& e) const { |
---|
| 1078 | if( e.it != edges.end() ) { |
---|
| 1079 | return *e.it; |
---|
| 1080 | } |
---|
| 1081 | else { |
---|
| 1082 | return INVALID; |
---|
| 1083 | } |
---|
| 1084 | } |
---|
| 1085 | |
---|
| 1086 | template<typename Gr> |
---|
| 1087 | typename DynamicPath<Gr>::GraphNode |
---|
| 1088 | DynamicPath<Gr>::graphNode(const NodeIt& n) const { |
---|
| 1089 | if( n.idx < length() ) { |
---|
| 1090 | return n.tail ? G.tail(edges[n.idx]) : G.head(edges[n.idx]); |
---|
| 1091 | } |
---|
| 1092 | else if( n.idx == length() ) { |
---|
| 1093 | return _last; |
---|
| 1094 | } |
---|
| 1095 | else { |
---|
| 1096 | return INVALID; |
---|
| 1097 | } |
---|
| 1098 | } |
---|
| 1099 | |
---|
| 1100 | template<typename Gr> |
---|
| 1101 | typename DynamicPath<Gr>::EdgeIt& |
---|
| 1102 | DynamicPath<Gr>::nth(EdgeIt &e, size_t k) const { |
---|
| 1103 | if( k>=length() ) { |
---|
| 1104 | // FIXME: invalid EdgeIt |
---|
| 1105 | e.it = edges.end(); |
---|
| 1106 | e.forw = true; |
---|
| 1107 | return e; |
---|
| 1108 | } |
---|
| 1109 | |
---|
| 1110 | e.it = edges.begin()+k; |
---|
| 1111 | if(k==0) { |
---|
| 1112 | e.forw = ( G.tail(*e.it) == _first ); |
---|
| 1113 | } |
---|
| 1114 | else { |
---|
| 1115 | e.forw = ( G.tail(*e.it) == G.tail(edges[k-1]) || |
---|
| 1116 | G.tail(*e.it) == G.head(edges[k-1]) ); |
---|
| 1117 | } |
---|
| 1118 | return e; |
---|
| 1119 | } |
---|
| 1120 | |
---|
| 1121 | template<typename Gr> |
---|
| 1122 | typename DynamicPath<Gr>::NodeIt& |
---|
| 1123 | DynamicPath<Gr>::nth(NodeIt &n, size_t k) const { |
---|
| 1124 | if( k>length() ) { |
---|
| 1125 | // FIXME: invalid NodeIt |
---|
| 1126 | n.idx = length()+1; |
---|
| 1127 | n.tail = true; |
---|
| 1128 | return n; |
---|
| 1129 | } |
---|
| 1130 | if( k==length() ) { |
---|
| 1131 | n.idx = length(); |
---|
| 1132 | n.tail = true; |
---|
| 1133 | return n; |
---|
| 1134 | } |
---|
| 1135 | n = tail(nth<EdgeIt>(k)); |
---|
| 1136 | return n; |
---|
| 1137 | } |
---|
| 1138 | |
---|
| 1139 | // Reszut konstruktorok: |
---|
| 1140 | |
---|
| 1141 | |
---|
| 1142 | template<typename Gr> |
---|
| 1143 | DynamicPath<Gr>::DynamicPath(const DynamicPath &P, const EdgeIt &a, |
---|
| 1144 | const EdgeIt &b) : |
---|
| 1145 | G(P.G), edges(a.it, b.it) // WARNING: if b.it < a.it this will blow up! |
---|
| 1146 | { |
---|
| 1147 | if( G.valid(P._first) && a.it < P.edges.end() ) { |
---|
| 1148 | _first = ( a.forw ? G.tail(*a.it) : G.head(*a.it) ); |
---|
| 1149 | if( b.it < P.edges.end() ) { |
---|
| 1150 | _last = ( b.forw ? G.tail(*b.it) : G.head(*b.it) ); |
---|
| 1151 | } |
---|
| 1152 | else { |
---|
| 1153 | _last = P._last; |
---|
| 1154 | } |
---|
| 1155 | } |
---|
| 1156 | } |
---|
| 1157 | |
---|
| 1158 | template<typename Gr> |
---|
| 1159 | DynamicPath<Gr>::DynamicPath(const DynamicPath &P, const NodeIt &a, |
---|
| 1160 | const NodeIt &b) : G(P.G) |
---|
| 1161 | { |
---|
| 1162 | if( !P.valid(a) || !P.valid(b) ) |
---|
| 1163 | return; |
---|
| 1164 | |
---|
| 1165 | int ai = a.idx, bi = b.idx; |
---|
| 1166 | if( bi<ai ) |
---|
| 1167 | std::swap(ai,bi); |
---|
| 1168 | |
---|
| 1169 | edges.resize(bi-ai); |
---|
| 1170 | copy(P.edges.begin()+ai, P.edges.begin()+bi, edges.begin()); |
---|
| 1171 | |
---|
| 1172 | _first = P.graphNode(a); |
---|
| 1173 | _last = P.graphNode(b); |
---|
| 1174 | } |
---|
| 1175 | |
---|
| 1176 | ///@} |
---|
| 1177 | |
---|
| 1178 | } // namespace hugo |
---|
| 1179 | |
---|
| 1180 | #endif // HUGO_PATH_H |
---|