lemon-0.x: comparison src/hugo/path.h

equal deleted inserted replaced

-:fa4945e50886
+:4b245f3c8b79
 //! \brief A structure for representing directed paths in a graph.
 //!
 //! A structure for representing directed path in a graph.
 //! \param Graph The graph type in which the path is.
 //! \param DM DebugMode, defaults to DefaultDebugMode.
 //!
 //! In a sense, the path can be treated as a graph, for is has \c NodeIt
 //! and \c EdgeIt with the same usage. These types converts to the \c Node
 //! and \c Edge of the original graph.
 //!
 //! \todo Thoroughfully check all the range and consistency tests.
 template<typename Graph>
 class DirPath {
 public:
 /// Edge type of the underlying graph.
 typedef typename Graph::Edge GraphEdge;
 /// Node type of the underlying graph.
 typedef typename Graph::Node GraphNode;
 class NodeIt;
 class EdgeIt;
 /* Iterator classes */
 /**
 * \brief Iterator class to iterate on the edges of the paths
 *
 * \ingroup paths
 * This class is used to iterate on the edges of the paths
 *
 * Of course it converts to Graph::Edge
 *
 * \todo Its interface differs from the standard edge iterator.
 * Yes, it shouldn't.
 */
 class EdgeIt {
 friend class DirPath;
 void validate() { if( size_t(idx) >= p->length() ) idx=-1; }
 };
 /**
 * \brief Iterator class to iterate on the nodes of the paths
 *
 * \ingroup paths
 * This class is used to iterate on the nodes of the paths
 *
 * Of course it converts to Graph::Node
 *
 * \todo Its interface differs from the standard node iterator.
 * Yes, it shouldn't.
 */
 class NodeIt {
 friend class DirPath;
 private:
 void validate() { if( size_t(idx) > p->length() ) idx=-1; }
 };
 friend class Builder;
 /**
 * \brief Class to build paths
 *
 * \ingroup paths
 * This class is used to fill a path with edges.
 *
 * You can push new edges to the front and to the back of the path in
 * arbitrary order then you should commit these changes to the graph.
 ///\param _P the path you want to fill in.
 ///
 Builder(DirPath &_P) : P(_P) {}
 /// Sets the starting node of the path.
 /// Sets the starting node of the path. Edge added to the path
 /// afterwards have to be incident to this node.
 /// It should be called iff the path is empty and before any call to
 /// \ref pushFront() or \ref pushBack()
 void setStartNode(const GraphNode &) {}
 	back.push_back(e);
 }
 ///Commit the changes to the path.
 void commit() {
-	if( !(front.empty() && back.empty()) ) {
+	if( !front.empty() || !back.empty() ) {
 	  Container tmp;
 	  tmp.reserve(front.size()+back.size()+P.length());
 	  tmp.insert(tmp.end(), front.rbegin(), front.rend());
 	  tmp.insert(tmp.end(), P.edges.begin(), P.edges.end());
 	  tmp.insert(tmp.end(), back.begin(), back.end());
 	  front.clear();
 	  back.clear();
 	}
 }
-// FIXME: Hmm, pontosan hogy is kene ezt csinalni?
-// Hogy kenyelmes egy ilyet hasznalni?
 ///Reserve storage for the builder in advance.
-///If you know an reasonable upper bound of the number of the edges
+///If you know a reasonable upper bound of the number of the edges
-///to add, using this function you can speed up the building.
+///to add to the front, using this function you can speed up the building.
-void reserve(size_t r) {
-	front.reserve(r);
+void reserveFront(size_t r) {front.reserve(r);}
-	back.reserve(r);
-}
+///Reserve storage for the builder in advance.
-void reserveFront(size_t r) {}
+///If you know a reasonable upper bound of the number of the edges
-void reserveBack(size_t r) {}
+///to add to the back, using this function you can speed up the building.
+void reserveBack(size_t r) {back.reserve(r);}
 private:
 bool empty() {
 	return front.empty() && back.empty() && P.empty();
 }
 //! a path in a \e directed graph but the edges should not be directed
 //! forward.
 //!
 //! \param Graph The graph type in which the path is.
 //! \param DM DebugMode, defaults to DefaultDebugMode.
 //!
 //! In a sense, the path can be treated as a graph, for is has \c NodeIt
 //! and \c EdgeIt with the same usage. These types converts to the \c Node
 //! and \c Edge of the original graph.
 //!
 //! \todo Thoroughfully check all the range and consistency tests.
 /**
 * \brief Iterator class to iterate on the edges of the paths
 *
 * \ingroup paths
 * This class is used to iterate on the edges of the paths
 *
 * Of course it converts to Graph::Edge
 *
 * \todo Its interface differs from the standard edge iterator.
 * Yes, it shouldn't.
 */
 class EdgeIt {
 friend class UndirPath;
 void validate() { if( size_t(idx) >= p->length() ) idx=-1; }
 };
 /**
 * \brief Iterator class to iterate on the nodes of the paths
 *
 * \ingroup paths
 * This class is used to iterate on the nodes of the paths
 *
 * Of course it converts to Graph::Node
 *
 * \todo Its interface differs from the standard node iterator.
 * Yes, it shouldn't.
 */
 class NodeIt {
 friend class UndirPath;
 private:
 void validate() { if( size_t(idx) > p->length() ) idx=-1; }
 };
 friend class Builder;
 /**
 * \brief Class to build paths
 *
 * \ingroup paths
 * This class is used to fill a path with edges.
 *
 * You can push new edges to the front and to the back of the path in
 * arbitrary order then you should commit these changes to the graph.
 ///\param _P the path you want to fill in.
 ///
 Builder(UndirPath &_P) : P(_P) {}
 /// Sets the starting node of the path.
 /// Sets the starting node of the path. Edge added to the path
 /// afterwards have to be incident to this node.
 /// It should be called iff the path is empty and before any call to
 /// \ref pushFront() or \ref pushBack()
 void setStartNode(const GraphNode &) {}
 	  front.clear();
 	  back.clear();
 	}
 }
-// FIXME: Hmm, pontosan hogy is kene ezt csinalni?
-// Hogy kenyelmes egy ilyet hasznalni?
 ///Reserve storage for the builder in advance.
-///If you know an reasonable upper bound of the number of the edges
+///If you know a reasonable upper bound of the number of the edges
-///to add, using this function you can speed up the building.
+///to add to the front, using this function you can speed up the building.
-void reserve(size_t r) {
-	front.reserve(r);
+void reserveFront(size_t r) {front.reserve(r);}
-	back.reserve(r);
-}
+///Reserve storage for the builder in advance.
-void reserveFront(size_t r) {}
+///If you know a reasonable upper bound of the number of the edges
-void reserveBack(size_t r) {}
+///to add to the back, using this function you can speed up the building.
+void reserveBack(size_t r) {back.reserve(r);}
 private:
 bool empty() {
 	return front.empty() && back.empty() && P.empty();
 }
 };
 };
-/**********************************************************************/
-/* Ennek az allocatorosdinak sokkal jobban utana kene nezni a hasznalata
-elott. Eleg bonyinak nez ki, ahogyan azokat az STL-ben hasznaljak. */
-template<typename Graph>
-class DynamicPath {
-public:
-typedef typename Graph::Edge GraphEdge;
-typedef typename Graph::Node GraphNode;
-class NodeIt;
-class EdgeIt;
-protected:
-Graph& G;
-// FIXME: ehelyett eleg lenne tarolni ket boolt: a ket szelso el
-// iranyitasat:
-GraphNode _first, _last;
-typedef std::deque<GraphEdge> Container;
-Container edges;
-public:
-DynamicPath(Graph &_G) : G(_G), _first(INVALID), _last(INVALID) {}
-/// Subpath defined by two nodes.
-/// Nodes may be in reversed order, then
-/// we contstruct the reversed path.
-DynamicPath(const DynamicPath &P, const NodeIt &a, const NodeIt &b);
-/// Subpath defined by two edges. Contains edges in [a,b)
-/// It is an error if the two edges are not in order!
-DynamicPath(const DynamicPath &P, const EdgeIt &a, const EdgeIt &b);
-size_t length() const { return edges.size(); }
-GraphNode tail() const { return _first; }
-GraphNode head() const { return _last; }
-NodeIt& first(NodeIt &n) const { return nth(n, 0); }
-EdgeIt& first(EdgeIt &e) const { return nth(e, 0); }
-template<typename It>
-It first() const {
-It e;
-first(e);
-return e;
-}
-NodeIt& nth(NodeIt &, size_t) const;
-EdgeIt& nth(EdgeIt &, size_t) const;
-template<typename It>
-It nth(size_t n) const {
-It e;
-nth(e, n);
-return e;
-}
-bool valid(const NodeIt &n) const { return n.idx <= length(); }
-bool valid(const EdgeIt &e) const { return e.it < edges.end(); }
-bool isForward(const EdgeIt &e) const { return e.forw; }
-/// index of a node on the path. Returns length+2 for the invalid NodeIt
-int index(const NodeIt &n) const { return n.idx; }
-/// index of an edge on the path. Returns length+1 for the invalid EdgeIt
-int index(const EdgeIt &e) const { return e.it - edges.begin(); }
-EdgeIt& next(EdgeIt &e) const;
-NodeIt& next(NodeIt &n) const;
-template <typename It>
-It getNext(It it) const {
-It tmp(it); return next(tmp);
-}
-// A path is constructed using the following four functions.
-// They return false if the requested operation is inconsistent
-// with the path constructed so far.
-// If your path has only one edge you MUST set either "from" or "to"!
-// So you probably SHOULD call it in any case to be safe (and check the
-// returned value to check if your path is consistent with your idea).
-bool pushFront(const GraphEdge &e);
-bool pushBack(const GraphEdge &e);
-bool setFrom(const GraphNode &n);
-bool setTo(const GraphNode &n);
-// WARNING: these two functions return the head/tail of an edge with
-// respect to the direction of the path!
-// So G.head(P.graphEdge(e)) == P.graphNode(P.head(e)) holds only if
-// P.forward(e) is true (or the edge is a loop)!
-NodeIt head(const EdgeIt& e) const;
-NodeIt tail(const EdgeIt& e) const;
-// FIXME: ezeknek valami jobb nev kellene!!!
-GraphEdge graphEdge(const EdgeIt& e) const;
-GraphNode graphNode(const NodeIt& n) const;
-/*** Iterator classes ***/
-class EdgeIt {
-friend class DynamicPath;
-typename Container::const_iterator it;
-bool forw;
-public:
-// FIXME: jarna neki ilyen is...
-// EdgeIt(Invalid);
-bool forward() const { return forw; }
-bool operator==(const EdgeIt& e) const { return it==e.it; }
-bool operator!=(const EdgeIt& e) const { return it!=e.it; }
-bool operator<(const EdgeIt& e) const { return it<e.it; }
-};
-class NodeIt {
-friend class DynamicPath;
-size_t idx;
-bool tail;  // Is this node the tail of the edge with same idx?
-public:
-// FIXME: jarna neki ilyen is...
-// NodeIt(Invalid);
-bool operator==(const NodeIt& n) const { return idx==n.idx; }
-bool operator!=(const NodeIt& n) const { return idx!=n.idx; }
-bool operator<(const NodeIt& n) const { return idx<n.idx; }
-};
-private:
-bool edgeIncident(const GraphEdge &e, const GraphNode &a,
-		      GraphNode &b);
-bool connectTwoEdges(const GraphEdge &e, const GraphEdge &f);
-};
-template<typename Gr>
-typename DynamicPath<Gr>::EdgeIt&
-DynamicPath<Gr>::next(DynamicPath::EdgeIt &e) const {
-if( e.it == edges.end() )
-return e;
-GraphNode common_node = ( e.forw ? G.head(*e.it) : G.tail(*e.it) );
-++e.it;
-// Invalid edgeit is always forward :)
-if( e.it == edges.end() ) {
-e.forw = true;
-return e;
-}
-e.forw = ( G.tail(*e.it) == common_node );
-return e;
-}
-template<typename Gr>
-typename DynamicPath<Gr>::NodeIt& DynamicPath<Gr>::next(NodeIt &n) const {
-if( n.idx >= length() ) {
-// FIXME: invalid
-n.idx = length()+1;
-return n;
-}
-GraphNode next_node = ( n.tail ? G.head(edges[n.idx]) :
-			      G.tail(edges[n.idx]) );
-++n.idx;
-if( n.idx < length() ) {
-n.tail = ( next_node == G.tail(edges[n.idx]) );
-}
-else {
-n.tail = true;
-}
-return n;
-}
-template<typename Gr>
-bool DynamicPath<Gr>::edgeIncident(const GraphEdge &e, const GraphNode &a,
-			  GraphNode &b) {
-if( G.tail(e) == a ) {
-b=G.head(e);
-return true;
-}
-if( G.head(e) == a ) {
-b=G.tail(e);
-return true;
-}
-return false;
-}
-template<typename Gr>
-bool DynamicPath<Gr>::connectTwoEdges(const GraphEdge &e,
-			     const GraphEdge &f) {
-if( edgeIncident(f, G.tail(e), _last) ) {
-_first = G.head(e);
-return true;
-}
-if( edgeIncident(f, G.head(e), _last) ) {
-_first = G.tail(e);
-return true;
-}
-return false;
-}
-template<typename Gr>
-bool DynamicPath<Gr>::pushFront(const GraphEdge &e) {
-if( G.valid(_first) ) {
-	if( edgeIncident(e, _first, _first) ) {
-	  edges.push_front(e);
-	  return true;
-	}
-	else
-	  return false;
-}
-else if( length() < 1 || connectTwoEdges(e, edges[0]) ) {
-edges.push_front(e);
-return true;
-}
-else
-return false;
-}
-template<typename Gr>
-bool DynamicPath<Gr>::pushBack(const GraphEdge &e) {
-if( G.valid(_last) ) {
-	if( edgeIncident(e, _last, _last) ) {
-	  edges.push_back(e);
-	  return true;
-	}
-	else
-	  return false;
-}
-else if( length() < 1 || connectTwoEdges(edges[0], e) ) {
-edges.push_back(e);
-return true;
-}
-else
-return false;
-}
-template<typename Gr>
-bool DynamicPath<Gr>::setFrom(const GraphNode &n) {
-if( G.valid(_first) ) {
-return _first == n;
-}
-else {
-if( length() > 0) {
-	if( edgeIncident(edges[0], n, _last) ) {
-	  _first = n;
-	  return true;
-	}
-	else return false;
-}
-else {
-	_first = _last = n;
-	return true;
-}
-}
-}
-template<typename Gr>
-bool DynamicPath<Gr>::setTo(const GraphNode &n) {
-if( G.valid(_last) ) {
-return _last == n;
-}
-else {
-if( length() > 0) {
-	if( edgeIncident(edges[0], n, _first) ) {
-	  _last = n;
-	  return true;
-	}
-	else return false;
-}
-else {
-	_first = _last = n;
-	return true;
-}
-}
-}
-template<typename Gr>
-typename DynamicPath<Gr>::NodeIt
-DynamicPath<Gr>::tail(const EdgeIt& e) const {
-NodeIt n;
-if( e.it == edges.end() ) {
-// FIXME: invalid-> invalid
-n.idx = length() + 1;
-n.tail = true;
-return n;
-}
-n.idx = e.it-edges.begin();
-n.tail = e.forw;
-return n;
-}
-template<typename Gr>
-typename DynamicPath<Gr>::NodeIt
-DynamicPath<Gr>::head(const EdgeIt& e) const {
-if( e.it == edges.end()-1 ) {
-return _last;
-}
-EdgeIt next_edge = e;
-next(next_edge);
-return tail(next_edge);
-}
-template<typename Gr>
-typename DynamicPath<Gr>::GraphEdge
-DynamicPath<Gr>::graphEdge(const EdgeIt& e) const {
-if( e.it != edges.end() ) {
-return *e.it;
-}
-else {
-return INVALID;
-}
-}
-template<typename Gr>
-typename DynamicPath<Gr>::GraphNode
-DynamicPath<Gr>::graphNode(const NodeIt& n) const {
-if( n.idx < length() ) {
-return n.tail ? G.tail(edges[n.idx]) : G.head(edges[n.idx]);
-}
-else if( n.idx == length() ) {
-return _last;
-}
-else {
-return INVALID;
-}
-}
-template<typename Gr>
-typename DynamicPath<Gr>::EdgeIt&
-DynamicPath<Gr>::nth(EdgeIt &e, size_t k) const {
-if( k>=length() ) {
-// FIXME: invalid EdgeIt
-e.it = edges.end();
-e.forw = true;
-return e;
-}
-e.it = edges.begin()+k;
-if(k==0) {
-e.forw = ( G.tail(*e.it) == _first );
-}
-else {
-e.forw = ( G.tail(*e.it) == G.tail(edges[k-1]) ||
-		 G.tail(*e.it) == G.head(edges[k-1]) );
-}
-return e;
-}
-template<typename Gr>
-typename DynamicPath<Gr>::NodeIt&
-DynamicPath<Gr>::nth(NodeIt &n, size_t k) const {
-if( k>length() ) {
-// FIXME: invalid NodeIt
-n.idx = length()+1;
-n.tail = true;
-return n;
-}
-if( k==length() ) {
-n.idx = length();
-n.tail = true;
-return n;
-}
-n = tail(nth<EdgeIt>(k));
-return n;
-}
-// Reszut konstruktorok:
-template<typename Gr>
-DynamicPath<Gr>::DynamicPath(const DynamicPath &P, const EdgeIt &a,
-			       const EdgeIt &b) :
-G(P.G), edges(a.it, b.it)    // WARNING: if b.it < a.it this will blow up!
-{
-if( G.valid(P._first) && a.it < P.edges.end() ) {
-_first = ( a.forw ? G.tail(*a.it) : G.head(*a.it) );
-if( b.it < P.edges.end() ) {
-	_last = ( b.forw ? G.tail(*b.it) : G.head(*b.it) );
-}
-else {
-	_last = P._last;
-}
-}
-}
-template<typename Gr>
-DynamicPath<Gr>::DynamicPath(const DynamicPath &P, const NodeIt &a,
-			       const NodeIt &b) : G(P.G)
-{
-if( !P.valid(a) || !P.valid(b) )
-return;
-int ai = a.idx, bi = b.idx;
-if( bi<ai )
-std::swap(ai,bi);
-edges.resize(bi-ai);
-copy(P.edges.begin()+ai, P.edges.begin()+bi, edges.begin());
-_first = P.graphNode(a);
-_last = P.graphNode(b);
-}
 ///@}
 } // namespace hugo
 #endif // HUGO_PATH_H

changeset 846	a7a406fdb006
parent 835	eb9587f09b42
child 852	d50d89b86870