RhodeCode

            snapshot.addNode(nodes[i]);

          }

        }

        virtual void clear() {

          Node node;

          for (notifier()->first(node); node != INVALID;

               notifier()->next(node)) {

            snapshot.eraseNode(node);

          }

        }

        Snapshot& snapshot;

      };

      class ArcObserverProxy : public ArcNotifier::ObserverBase {

      public:

        ArcObserverProxy(Snapshot& _snapshot)

          : snapshot(_snapshot) {}

        using ArcNotifier::ObserverBase::attach;

        using ArcNotifier::ObserverBase::detach;

        using ArcNotifier::ObserverBase::attached;

      protected:

        virtual void add(const Arc& arc) {

          snapshot.addArc(arc);

        }

        virtual void add(const std::vector<Arc>& arcs) {

          for (int i = arcs.size() - 1; i >= 0; ++i) {

            snapshot.addArc(arcs[i]);

          }

        }

        virtual void erase(const Arc& arc) {

          snapshot.eraseArc(arc);

        }

        virtual void erase(const std::vector<Arc>& arcs) {

          for (int i = 0; i < int(arcs.size()); ++i) {

            snapshot.eraseArc(arcs[i]);

          }

        }

        virtual void build() {

          Arc arc;

          std::vector<Arc> arcs;

          for (notifier()->first(arc); arc != INVALID;

               notifier()->next(arc)) {

            arcs.push_back(arc);

          }

          for (int i = arcs.size() - 1; i >= 0; --i) {

            snapshot.addArc(arcs[i]);

          }

        }

        virtual void clear() {

          Arc arc;

          for (notifier()->first(arc); arc != INVALID;

               notifier()->next(arc)) {

            snapshot.eraseArc(arc);

          }

        }

        Snapshot& snapshot;

      };

      ListDigraph *digraph;

      NodeObserverProxy node_observer_proxy;

      ArcObserverProxy arc_observer_proxy;

      std::list<Node> added_nodes;

      std::list<Arc> added_arcs;

      void addNode(const Node& node) {

        added_nodes.push_front(node);

      }

      void eraseNode(const Node& node) {

        std::list<Node>::iterator it =

          std::find(added_nodes.begin(), added_nodes.end(), node);

        if (it == added_nodes.end()) {

          clear();

          arc_observer_proxy.detach();

          throw NodeNotifier::ImmediateDetach();

        } else {

          added_nodes.erase(it);

        }

      }

      void addArc(const Arc& arc) {

        added_arcs.push_front(arc);

      }

      void eraseArc(const Arc& arc) {

        std::list<Arc>::iterator it =

          std::find(added_arcs.begin(), added_arcs.end(), arc);

        if (it == added_arcs.end()) {

          clear();

          node_observer_proxy.detach();

          throw ArcNotifier::ImmediateDetach();

        } else {

          added_arcs.erase(it);

        }

      }

      void attach(ListDigraph &_digraph) {

        digraph = &_digraph;

        node_observer_proxy.attach(digraph->notifier(Node()));

        arc_observer_proxy.attach(digraph->notifier(Arc()));

      }

      void detach() {

        node_observer_proxy.detach();

        arc_observer_proxy.detach();

      }

      bool attached() const {

        return node_observer_proxy.attached();

      }

      void clear() {

        added_nodes.clear();

        added_arcs.clear();

      }

    public:

      /// \brief Default constructor.

      ///

      /// Default constructor.

      /// To actually make a snapshot you must call save().

      Snapshot()

        : digraph(0), node_observer_proxy(*this),

          arc_observer_proxy(*this) {}

      /// \brief Constructor that immediately makes a snapshot.

      ///

      /// This constructor immediately makes a snapshot of the digraph.

      /// \param _digraph The digraph we make a snapshot of.

      Snapshot(ListDigraph &_digraph)

        : node_observer_proxy(*this),

          arc_observer_proxy(*this) {

        attach(_digraph);

      }

      /// \brief Make a snapshot.

      ///

      /// Make a snapshot of the digraph.

      ///

      /// This function can be called more than once. In case of a repeated

      /// call, the previous snapshot gets lost.

      /// \param _digraph The digraph we make the snapshot of.

      void save(ListDigraph &_digraph) {

        if (attached()) {

          detach();

          clear();

        }

        attach(_digraph);

      }

      /// \brief Undo the changes until the last snapshot.

      //

      /// Undo the changes until the last snapshot created by save().

      void restore() {

        detach();

        for(std::list<Arc>::iterator it = added_arcs.begin();

            it != added_arcs.end(); ++it) {

          digraph->erase(*it);

        }

        for(std::list<Node>::iterator it = added_nodes.begin();

            it != added_nodes.end(); ++it) {

          digraph->erase(*it);

        }

        clear();

      }

      /// \brief Gives back true when the snapshot is valid.

      ///

      /// Gives back true when the snapshot is valid.

      bool valid() const {

        return attached();

      }

    };

  };

  ///@}

  class ListGraphBase {

  protected:

    struct NodeT {

      int first_out;

      int prev, next;

    };

    struct ArcT {

      int target;

      int prev_out, next_out;

    };

    std::vector<NodeT> nodes;

    int first_node;

    int first_free_node;

    std::vector<ArcT> arcs;

    int first_free_arc;

  public:

    typedef ListGraphBase Digraph;

    class Node;

    class Arc;

    class Edge;

    class Node {

      friend class ListGraphBase;

    protected:

      int id;

      explicit Node(int pid) { id = pid;}

    public:

      Node() {}

      Node (Invalid) { id = -1; }

      bool operator==(const Node& node) const {return id == node.id;}

      bool operator!=(const Node& node) const {return id != node.id;}

      bool operator<(const Node& node) const {return id < node.id;}

    };

    class Edge {

      friend class ListGraphBase;

    protected:

      int id;

      explicit Edge(int pid) { id = pid;}

    public:

      Edge() {}

      Edge (Invalid) { id = -1; }

      bool operator==(const Edge& edge) const {return id == edge.id;}

      bool operator!=(const Edge& edge) const {return id != edge.id;}

      bool operator<(const Edge& edge) const {return id < edge.id;}

    };

    class Arc {

      friend class ListGraphBase;

    protected:

      int id;

      explicit Arc(int pid) { id = pid;}

    public:

      Arc() {}

      Arc (Invalid) { id = -1; }

      bool operator==(const Arc& arc) const {return id == arc.id;}

      bool operator!=(const Arc& arc) const {return id != arc.id;}

      bool operator<(const Arc& arc) const {return id < arc.id;}

    };

    ListGraphBase()

      : nodes(), first_node(-1),

        first_free_node(-1), arcs(), first_free_arc(-1) {}

    int maxNodeId() const { return nodes.size()-1; }

    int maxEdgeId() const { return arcs.size() / 2 - 1; }

    int maxArcId() const { return arcs.size()-1; }

    Node source(Arc e) const { return Node(arcs[e.id ^ 1].target); }

    Node target(Arc e) const { return Node(arcs[e.id].target); }

    Node u(Edge e) const { return Node(arcs[2 * e.id].target); }

    Node v(Edge e) const { return Node(arcs[2 * e.id + 1].target); }

    static bool direction(Arc e) {

      return (e.id & 1) == 1;

    }

    static Arc direct(Edge e, bool d) {

      return Arc(e.id * 2 + (d ? 1 : 0));

    }

    void first(Node& node) const {

      node.id = first_node;

    }

    void next(Node& node) const {

      node.id = nodes[node.id].next;

    }

    void first(Arc& e) const {

      int n = first_node;

      while (n != -1 && nodes[n].first_out == -1) {

        n = nodes[n].next;

      }

      e.id = (n == -1) ? -1 : nodes[n].first_out;

    }

    void next(Arc& e) const {

      if (arcs[e.id].next_out != -1) {

        e.id = arcs[e.id].next_out;

      } else {

        int n = nodes[arcs[e.id ^ 1].target].next;

        while(n != -1 && nodes[n].first_out == -1) {

          n = nodes[n].next;

        }

        e.id = (n == -1) ? -1 : nodes[n].first_out;

      }

    }

    void first(Edge& e) const {

      int n = first_node;

      while (n != -1) {

        e.id = nodes[n].first_out;

        while ((e.id & 1) != 1) {

          e.id = arcs[e.id].next_out;

        }

        if (e.id != -1) {

          e.id /= 2;

          return;

        }

        n = nodes[n].next;

      }

      e.id = -1;

    }

    void next(Edge& e) const {

      int n = arcs[e.id * 2].target;

      e.id = arcs[(e.id * 2) | 1].next_out;

      while ((e.id & 1) != 1) {

        e.id = arcs[e.id].next_out;

      }

      if (e.id != -1) {

        e.id /= 2;

        return;

      }

      n = nodes[n].next;

      while (n != -1) {

        e.id = nodes[n].first_out;

        while ((e.id & 1) != 1) {

          e.id = arcs[e.id].next_out;

        }

        if (e.id != -1) {

          e.id /= 2;

          return;

        }

        n = nodes[n].next;

      }

      e.id = -1;

    }

    void firstOut(Arc &e, const Node& v) const {

      e.id = nodes[v.id].first_out;

    }

    void nextOut(Arc &e) const {

      e.id = arcs[e.id].next_out;

    }

    void firstIn(Arc &e, const Node& v) const {

      e.id = ((nodes[v.id].first_out) ^ 1);

      if (e.id == -2) e.id = -1;

    }

    void nextIn(Arc &e) const {

      e.id = ((arcs[e.id ^ 1].next_out) ^ 1);

      if (e.id == -2) e.id = -1;

    }

    void firstInc(Edge &e, bool& d, const Node& v) const {

      int a = nodes[v.id].first_out;

      if (a != -1 ) {

        e.id = a / 2;

        d = ((a & 1) == 1);

      } else {

        e.id = -1;

        d = true;

      }

    }

    void nextInc(Edge &e, bool& d) const {

      int a = (arcs[(e.id * 2) | (d ? 1 : 0)].next_out);

      if (a != -1 ) {

        e.id = a / 2;

        d = ((a & 1) == 1);

      } else {

        e.id = -1;

        d = true;

      }

    }

    static int id(Node v) { return v.id; }

    static int id(Arc e) { return e.id; }

    static int id(Edge e) { return e.id; }

    static Node nodeFromId(int id) { return Node(id);}

    static Arc arcFromId(int id) { return Arc(id);}

    static Edge edgeFromId(int id) { return Edge(id);}

    bool valid(Node n) const {

      return n.id >= 0 && n.id < static_cast<int>(nodes.size()) &&

        nodes[n.id].prev != -2;

    }

    bool valid(Arc a) const {

      return a.id >= 0 && a.id < static_cast<int>(arcs.size()) &&

        arcs[a.id].prev_out != -2;

    }

    bool valid(Edge e) const {

      return e.id >= 0 && 2 * e.id < static_cast<int>(arcs.size()) &&

        arcs[2 * e.id].prev_out != -2;

    }

    Node addNode() {

      int n;

      if(first_free_node==-1) {

        n = nodes.size();

        nodes.push_back(NodeT());

      } else {

        n = first_free_node;

        first_free_node = nodes[n].next;

      }

      nodes[n].next = first_node;

      if (first_node != -1) nodes[first_node].prev = n;

      first_node = n;

      nodes[n].prev = -1;

      nodes[n].first_out = -1;

      return Node(n);

    }

    Edge addEdge(Node u, Node v) {

      int n;

      if (first_free_arc == -1) {

        n = arcs.size();

        arcs.push_back(ArcT());

        arcs.push_back(ArcT());

      } else {

        n = first_free_arc;

        first_free_arc = arcs[n].next_out;

      }

      arcs[n].target = u.id;

      arcs[n | 1].target = v.id;

      arcs[n].next_out = nodes[v.id].first_out;

      if (nodes[v.id].first_out != -1) {

        arcs[nodes[v.id].first_out].prev_out = n;

      }

      arcs[n].prev_out = -1;

      nodes[v.id].first_out = n;

      arcs[n | 1].next_out = nodes[u.id].first_out;

      if (nodes[u.id].first_out != -1) {

        arcs[nodes[u.id].first_out].prev_out = (n | 1);

      }

      arcs[n | 1].prev_out = -1;

      nodes[u.id].first_out = (n | 1);

      return Edge(n / 2);

    }

    void erase(const Node& node) {

      int n = node.id;

      if(nodes[n].next != -1) {

        nodes[nodes[n].next].prev = nodes[n].prev;

      }

      if(nodes[n].prev != -1) {

        nodes[nodes[n].prev].next = nodes[n].next;

      } else {

        first_node = nodes[n].next;

      }

      nodes[n].next = first_free_node;

      first_free_node = n;

      nodes[n].prev = -2;

    }

    void erase(const Edge& edge) {

      int n = edge.id * 2;

      if (arcs[n].next_out != -1) {

        arcs[arcs[n].next_out].prev_out = arcs[n].prev_out;

      }

      if (arcs[n].prev_out != -1) {

        arcs[arcs[n].prev_out].next_out = arcs[n].next_out;

      } else {

        nodes[arcs[n | 1].target].first_out = arcs[n].next_out;

      }

      if (arcs[n | 1].next_out != -1) {

        arcs[arcs[n | 1].next_out].prev_out = arcs[n | 1].prev_out;

      }

      if (arcs[n | 1].prev_out != -1) {

        arcs[arcs[n | 1].prev_out].next_out = arcs[n | 1].next_out;

      } else {

        nodes[arcs[n].target].first_out = arcs[n | 1].next_out;

      }

    ///Use DigraphCopy() instead.

    ///Assignment of SmartDigraph to another one is \e not allowed.

    ///Use DigraphCopy() instead.

    void operator=(const SmartDigraph &) {}

  public:

    /// Constructor

    /// Constructor.

    ///

    SmartDigraph() {};

    ///Add a new node to the digraph.

    /// \return the new node.

    ///

    Node addNode() { return Parent::addNode(); }

    ///Add a new arc to the digraph.

    ///Add a new arc to the digraph with source node \c s

    ///and target node \c t.

    ///\return the new arc.

    Arc addArc(const Node& s, const Node& t) {

      return Parent::addArc(s, t);

    }

    /// \brief Using this it is possible to avoid the superfluous memory

    /// allocation.

    /// Using this it is possible to avoid the superfluous memory

    /// allocation: if you know that the digraph you want to build will

    /// be very large (e.g. it will contain millions of nodes and/or arcs)

    /// then it is worth reserving space for this amount before starting

    /// to build the digraph.

    /// \sa reserveArc

    void reserveNode(int n) { nodes.reserve(n); };

    /// \brief Using this it is possible to avoid the superfluous memory

    /// allocation.

    /// Using this it is possible to avoid the superfluous memory

    /// allocation: if you know that the digraph you want to build will

    /// be very large (e.g. it will contain millions of nodes and/or arcs)

    /// then it is worth reserving space for this amount before starting

    /// to build the digraph.

    /// \sa reserveNode

    void reserveArc(int m) { arcs.reserve(m); };

    /// \brief Node validity check

    ///

    /// This function gives back true if the given node is valid,

    /// ie. it is a real node of the graph.

    ///

    /// \warning A removed node (using Snapshot) could become valid again

    /// when new nodes are added to the graph.

    bool valid(Node n) const { return Parent::valid(n); }

    /// \brief Arc validity check

    ///

    /// This function gives back true if the given arc is valid,

    /// ie. it is a real arc of the graph.

    ///

    /// \warning A removed arc (using Snapshot) could become valid again

    /// when new arcs are added to the graph.

    bool valid(Arc a) const { return Parent::valid(a); }

    ///Clear the digraph.

    ///Erase all the nodes and arcs from the digraph.

    ///

    void clear() {

      Parent::clear();

    }

    ///Split a node.

    ///This function splits a node. First a new node is added to the digraph,

    ///then the source of each outgoing arc of \c n is moved to this new node.

    ///If \c connect is \c true (this is the default value), then a new arc

    ///from \c n to the newly created node is also added.

    ///\return The newly created node.

    ///

    ///\note The <tt>Arc</tt>s

    ///referencing a moved arc remain

    ///valid. However <tt>InArc</tt>'s and <tt>OutArc</tt>'s

    ///may be invalidated.

    ///\warning This functionality cannot be used together with the Snapshot

    ///feature.

    ///\todo It could be implemented in a bit faster way.

    Node split(Node n, bool connect = true)

    {

      Node b = addNode();

      nodes[b._id].first_out=nodes[n._id].first_out;

      nodes[n._id].first_out=-1;

      for(int i=nodes[b._id].first_out;i!=-1;i++) arcs[i].source=b._id;

      if(connect) addArc(n,b);

      return b;

    }

  public:

    class Snapshot;

  protected:

    void restoreSnapshot(const Snapshot &s)

    {

      while(s.arc_num<arcs.size()) {

        Arc arc = arcFromId(arcs.size()-1);

        Parent::notifier(Arc()).erase(arc);

        nodes[arcs.back().source].first_out=arcs.back().next_out;

        nodes[arcs.back().target].first_in=arcs.back().next_in;

        arcs.pop_back();

      }

      while(s.node_num<nodes.size()) {

        Node node = nodeFromId(nodes.size()-1);

        Parent::notifier(Node()).erase(node);

        nodes.pop_back();

      }

    }

  public:

    ///Class to make a snapshot of the digraph and to restrore to it later.

    ///Class to make a snapshot of the digraph and to restrore to it later.

    ///

    ///The newly added nodes and arcs can be removed using the

    ///restore() function.

    ///\note After you restore a state, you cannot restore

    ///a later state, in other word you cannot add again the arcs deleted

    ///by restore() using another one Snapshot instance.

    ///

    ///\warning If you do not use correctly the snapshot that can cause

    ///either broken program, invalid state of the digraph, valid but

    ///not the restored digraph or no change. Because the runtime performance

    ///the validity of the snapshot is not stored.

    class Snapshot

    {

      SmartDigraph *_graph;

    protected:

      friend class SmartDigraph;

      unsigned int node_num;

      unsigned int arc_num;

    public:

      ///Default constructor.

      ///Default constructor.

      ///To actually make a snapshot you must call save().

      ///

      Snapshot() : _graph(0) {}

      ///Constructor that immediately makes a snapshot

      ///This constructor immediately makes a snapshot of the digraph.

      ///\param _g The digraph we make a snapshot of.

      Snapshot(SmartDigraph &graph) : _graph(&graph) {

        node_num=_graph->nodes.size();

        arc_num=_graph->arcs.size();

      }

      ///Make a snapshot.

      ///Make a snapshot of the digraph.

      ///

      ///This function can be called more than once. In case of a repeated

      ///call, the previous snapshot gets lost.

      ///\param _g The digraph we make the snapshot of.

      void save(SmartDigraph &graph)

      {

        _graph=&graph;

        node_num=_graph->nodes.size();

        arc_num=_graph->arcs.size();

      }

      ///Undo the changes until a snapshot.

      ///Undo the changes until a snapshot created by save().

      ///

      ///\note After you restored a state, you cannot restore

      ///a later state, in other word you cannot add again the arcs deleted

      ///by restore().

      void restore()

      {

        _graph->restoreSnapshot(*this);

      }

    };

  };

  class SmartGraphBase {

  protected:

    struct NodeT {

      int first_out;

    };

    struct ArcT {

      int target;

      int next_out;

    };

    std::vector<NodeT> nodes;

    std::vector<ArcT> arcs;

    int first_free_arc;

  public:

    typedef SmartGraphBase Digraph;

    class Node;

    class Arc;

    class Edge;

    class Node {

      friend class SmartGraphBase;

    protected:

      int _id;

      explicit Node(int id) { _id = id;}

    public:

      Node() {}

      Node (Invalid) { _id = -1; }

      bool operator==(const Node& node) const {return _id == node._id;}

      bool operator!=(const Node& node) const {return _id != node._id;}

      bool operator<(const Node& node) const {return _id < node._id;}

    };

    class Edge {

      friend class SmartGraphBase;

    protected:

      int _id;

      explicit Edge(int id) { _id = id;}

    public:

      Edge() {}

      Edge (Invalid) { _id = -1; }

      bool operator==(const Edge& arc) const {return _id == arc._id;}

      bool operator!=(const Edge& arc) const {return _id != arc._id;}

      bool operator<(const Edge& arc) const {return _id < arc._id;}

    };

    class Arc {

      friend class SmartGraphBase;

    protected:

      int _id;

      explicit Arc(int id) { _id = id;}

    public:

      Arc() {}

      Arc (Invalid) { _id = -1; }

      bool operator==(const Arc& arc) const {return _id == arc._id;}

      bool operator!=(const Arc& arc) const {return _id != arc._id;}

      bool operator<(const Arc& arc) const {return _id < arc._id;}

    };

    SmartGraphBase()

      : nodes(), arcs() {}

    int maxNodeId() const { return nodes.size()-1; }

    int maxEdgeId() const { return arcs.size() / 2 - 1; }

    int maxArcId() const { return arcs.size()-1; }

    Node source(Arc e) const { return Node(arcs[e._id ^ 1].target); }

    Node target(Arc e) const { return Node(arcs[e._id].target); }

    Node u(Edge e) const { return Node(arcs[2 * e._id].target); }

    Node v(Edge e) const { return Node(arcs[2 * e._id + 1].target); }

    static bool direction(Arc e) {

      return (e._id & 1) == 1;

    }

    static Arc direct(Edge e, bool d) {

      return Arc(e._id * 2 + (d ? 1 : 0));

    }

    void first(Node& node) const {

      node._id = nodes.size() - 1;

    }

    void next(Node& node) const {

      --node._id;

    }

    void first(Arc& arc) const {

      arc._id = arcs.size() - 1;

    }

    void next(Arc& arc) const {

      --arc._id;

    }

    void first(Edge& arc) const {

      arc._id = arcs.size() / 2 - 1;

    }

    void next(Edge& arc) const {

      --arc._id;

    }

    void firstOut(Arc &arc, const Node& v) const {

      arc._id = nodes[v._id].first_out;

    }

    void nextOut(Arc &arc) const {

      arc._id = arcs[arc._id].next_out;

    }

    void firstIn(Arc &arc, const Node& v) const {

      arc._id = ((nodes[v._id].first_out) ^ 1);

      if (arc._id == -2) arc._id = -1;

    }

    void nextIn(Arc &arc) const {

      arc._id = ((arcs[arc._id ^ 1].next_out) ^ 1);

      if (arc._id == -2) arc._id = -1;

    }

    void firstInc(Edge &arc, bool& d, const Node& v) const {

      int de = nodes[v._id].first_out;

      if (de != -1) {

        arc._id = de / 2;

        d = ((de & 1) == 1);

      } else {

        arc._id = -1;

        d = true;

      }

    }

    void nextInc(Edge &arc, bool& d) const {

      int de = (arcs[(arc._id * 2) | (d ? 1 : 0)].next_out);

      if (de != -1) {

        arc._id = de / 2;

        d = ((de & 1) == 1);

      } else {

        arc._id = -1;

        d = true;

      }

    }

    static int id(Node v) { return v._id; }

    static int id(Arc e) { return e._id; }

    static int id(Edge e) { return e._id; }

    static Node nodeFromId(int id) { return Node(id);}

    static Arc arcFromId(int id) { return Arc(id);}

    static Edge edgeFromId(int id) { return Edge(id);}

    bool valid(Node n) const {

      return n._id >= 0 && n._id < static_cast<int>(nodes.size());

    }

    bool valid(Arc a) const {

      return a._id >= 0 && a._id < static_cast<int>(arcs.size());

    }

    bool valid(Edge e) const {

      return e._id >= 0 && 2 * e._id < static_cast<int>(arcs.size());

    }

    Node addNode() {

      int n = nodes.size();

      nodes.push_back(NodeT());

      nodes[n].first_out = -1;

      return Node(n);

    }

    Edge addEdge(Node u, Node v) {

      int n = arcs.size();

      arcs.push_back(ArcT());

      arcs.push_back(ArcT());

      arcs[n].target = u._id;

      arcs[n | 1].target = v._id;

      arcs[n].next_out = nodes[v._id].first_out;

      nodes[v._id].first_out = n;

      arcs[n | 1].next_out = nodes[u._id].first_out;

      nodes[u._id].first_out = (n | 1);

      return Edge(n / 2);

    }

    void clear() {

      arcs.clear();

      nodes.clear();

    }

  };

  typedef GraphExtender<SmartGraphBase> ExtendedSmartGraphBase;

  /// \ingroup graphs

  ///

  /// \brief A smart undirected graph class.

  ///

  /// This is a simple and fast graph implementation.

  /// It is also quite memory efficient, but at the price

  /// that <b> it does support only limited (only stack-like)

  /// node and arc deletions</b>.

  /// Except from this it conforms to

  /// the \ref concepts::Graph "Graph concept".

  ///

  /// It also has an

  /// important extra feature that

  /// its maps are real \ref concepts::ReferenceMap "reference map"s.

  ///

  /// \sa concepts::Graph.

  ///

  class SmartGraph : public ExtendedSmartGraphBase {

  private:

    ///SmartGraph is \e not copy constructible. Use GraphCopy() instead.

    ///SmartGraph is \e not copy constructible. Use GraphCopy() instead.

    ///

    SmartGraph(const SmartGraph &) : ExtendedSmartGraphBase() {};

    ///\brief Assignment of SmartGraph to another one is \e not allowed.

    ///Use GraphCopy() instead.

    ///Assignment of SmartGraph to another one is \e not allowed.

    ///Use GraphCopy() instead.

    void operator=(const SmartGraph &) {}

  public:

    typedef ExtendedSmartGraphBase Parent;

    /// Constructor

    /// Constructor.

    ///

    SmartGraph() {}

    ///Add a new node to the graph.

    /// \return the new node.

    ///

    Node addNode() { return Parent::addNode(); }

    ///Add a new edge to the graph.

    ///Add a new edge to the graph with node \c s

    ///and \c t.

    ///\return the new edge.

    Edge addEdge(const Node& s, const Node& t) {

      return Parent::addEdge(s, t);

    }

    /// \brief Node validity check

    ///

    /// This function gives back true if the given node is valid,

    /// ie. it is a real node of the graph.

    ///

    /// \warning A removed node (using Snapshot) could become valid again

    /// when new nodes are added to the graph.

    bool valid(Node n) const { return Parent::valid(n); }

    /// \brief Arc validity check

    ///

    /// This function gives back true if the given arc is valid,

    /// ie. it is a real arc of the graph.

    ///

    /// \warning A removed arc (using Snapshot) could become valid again

    /// when new edges are added to the graph.

    bool valid(Arc a) const { return Parent::valid(a); }

    /// \brief Edge validity check

    ///

    /// This function gives back true if the given edge is valid,

    /// ie. it is a real edge of the graph.

    ///

    /// \warning A removed edge (using Snapshot) could become valid again

    /// when new edges are added to the graph.

    bool valid(Edge e) const { return Parent::valid(e); }

    ///Clear the graph.

    ///Erase all the nodes and edges from the graph.

    ///

    void clear() {

      Parent::clear();

    }

  public:

    class Snapshot;

  protected:

    void saveSnapshot(Snapshot &s)

    {

      s._graph = this;

      s.node_num = nodes.size();

      s.arc_num = arcs.size();

    }

    void restoreSnapshot(const Snapshot &s)

    {

      while(s.arc_num<arcs.size()) {

        int n=arcs.size()-1;

        Edge arc=edgeFromId(n/2);