Changeset 1565:96244ea562a3 in lemon0.x for lemon/graph_utils.h
 Timestamp:
 07/18/05 17:07:28 (15 years ago)
 Branch:
 default
 Phase:
 public
 Convert:
 svn:c9d7d8f590d60310b91f818b3a526b0e/lemon/trunk@2064
 File:

 1 edited
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lemon/graph_utils.h
r1555 r1565 161 161 162 162 163 /// Finds an edge between two nodes of a graph. 164 163 template <typename Graph> 164 inline 165 typename enable_if<typename Graph::FindEdgeTag, typename Graph::Edge>::type 166 _findEdge(const Graph &g, 167 typename Graph::Node u, typename Graph::Node v, 168 typename Graph::Edge prev = INVALID) { 169 return g.findEdge(u, v, prev); 170 } 171 172 template <typename Graph> 173 inline typename Graph::Edge 174 _findEdge(Wrap<Graph> w, 175 typename Graph::Node u, 176 typename Graph::Node v, 177 typename Graph::Edge prev = INVALID) { 178 const Graph& g = w.value; 179 if (prev == INVALID) { 180 typename Graph::OutEdgeIt e(g, u); 181 while (e != INVALID && g.target(e) != v) ++e; 182 return e; 183 } else { 184 typename Graph::OutEdgeIt e(g, prev); ++e; 185 while (e != INVALID && g.target(e) != v) ++e; 186 return e; 187 } 188 } 189 190 /// \brief Finds an edge between two nodes of a graph. 191 /// 165 192 /// Finds an edge from node \c u to node \c v in graph \c g. 166 193 /// … … 176 203 /// } 177 204 /// \endcode 178 /// \todo We may want to use the "GraphBase" 179 /// interface here... 180 /// \bug Untested ... 181 template <typename Graph> 182 typename Graph::Edge findEdge(const Graph &g, 183 typename Graph::Node u, typename Graph::Node v, 184 typename Graph::Edge prev = INVALID) 185 { 186 typename Graph::OutEdgeIt e(g,prev); 187 // if(prev==INVALID) g.first(e,u); 188 if(prev==INVALID) e=typename Graph::OutEdgeIt(g,u); 189 else ++e; 190 while(e!=INVALID && g.target(e)!=v) ++e; 191 return e; 192 } 205 // /// \todo We may want to use the "GraphBase" 206 // /// interface here... 207 // /// It would not work with the undirected graphs. 208 template <typename Graph> 209 inline typename Graph::Edge findEdge(const Graph &g, 210 typename Graph::Node u, 211 typename Graph::Node v, 212 typename Graph::Edge prev = INVALID) { 213 return _findEdge<Graph>(g, u, v, prev); 214 } 215 216 /// \brief Iterator for iterating on edges connected the same nodes. 217 /// 218 /// Iterator for iterating on edges connected the same nodes. It is 219 /// higher level interface for the findEdge() function. You can 220 /// use it the next way: 221 /// \code 222 /// for (ConEdgeIt<Graph> it(g, src, trg); it != INVALID; ++it) { 223 /// ... 224 /// } 225 /// \endcode 226 /// 227 /// \author Balazs Dezso 228 template <typename _Graph> 229 class ConEdgeIt : public _Graph::Edge { 230 public: 231 232 typedef _Graph Graph; 233 typedef typename Graph::Edge Parent; 234 235 typedef typename Graph::Edge Edge; 236 typedef typename Graph::Node Node; 237 238 /// \brief Constructor. 239 /// 240 /// Construct a new ConEdgeIt iterating on the edges which 241 /// connects the \c u and \c v node. 242 ConEdgeIt(const Graph& g, Node u, Node v) : graph(g) { 243 Parent::operator=(findEdge(graph, u, v)); 244 } 245 246 /// \brief Constructor. 247 /// 248 /// Construct a new ConEdgeIt which continues the iterating from 249 /// the \c e edge. 250 ConEdgeIt(const Graph& g, Edge e) : Parent(e), graph(g) {} 251 252 /// \brief Increment operator. 253 /// 254 /// It increments the iterator and gives back the next edge. 255 ConEdgeIt& operator++() { 256 Parent::operator=(findEdge(graph, graph.source(*this), 257 graph.target(*this), *this)); 258 return *this; 259 } 260 private: 261 const Graph& graph; 262 }; 193 263 194 264 /// \brief Copy a map.
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