RhodeCode

    // \brief Base node of the iterator

    //

    // Returns the base node (ie. the source in this case) of the iterator

    Node baseNode(const OutArcIt &e) const {

      return Parent::source(static_cast<const Arc&>(e));

    }

    // \brief Running node of the iterator

    //

    // Returns the running node (ie. the target in this case) of the

    // iterator

    Node runningNode(const OutArcIt &e) const {

      return Parent::target(static_cast<const Arc&>(e));

    }

    // \brief Base node of the iterator

    //

    // Returns the base node (ie. the target in this case) of the iterator

    Node baseNode(const InArcIt &e) const {

      return Parent::target(static_cast<const Arc&>(e));

    }

    // \brief Running node of the iterator

    //

    // Returns the running node (ie. the source in this case) of the

    // iterator

    Node runningNode(const InArcIt &e) const {

      return Parent::source(static_cast<const Arc&>(e));

    }

    using Parent::first;

    // Mappable extension

    template <typename _Value>

    class ArcMap 

      : public MapExtender<DefaultMap<Digraph, Arc, _Value> > {

      typedef MapExtender<DefaultMap<Digraph, Arc, _Value> > Parent;

    public:

      explicit ArcMap(const Digraph& _g) 

	: Parent(_g) {}

      ArcMap(const Digraph& _g, const _Value& _v) 

	: Parent(_g, _v) {}

      ArcMap& operator=(const ArcMap& cmap) {

	return operator=<ArcMap>(cmap);

      }

      template <typename CMap>

      ArcMap& operator=(const CMap& cmap) {

        Parent::operator=(cmap);

	return *this;

      }

    };

    // Alteration extension

    Arc addArc(const Node& from, const Node& to) {

      Arc arc = Parent::addArc(from, to);

      notifier(Arc()).add(arc);

      return arc;

    }

    void clear() {

      notifier(Arc()).clear();

      Parent::clear();

    }

    void erase(const Arc& arc) {

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

      Parent::erase(arc);

    }

    ArcSetExtender() {

      arc_notifier.setContainer(*this);

    }

    ~ArcSetExtender() {

      arc_notifier.clear();

    }

  };

  // \ingroup digraphbits

  //

  // \brief Extender for the EdgeSets

  template <typename Base>

  class EdgeSetExtender : public Base {

    typedef Base Parent;

  public:

    typedef EdgeSetExtender Graph;

    typedef typename Parent::Node Node;

    typedef typename Parent::Arc Arc;

    typedef typename Parent::Edge Edge;

    int maxId(Node) const {

      return Parent::maxNodeId();

    }

    int maxId(Arc) const {

      return Parent::maxArcId();

    }

    int maxId(Edge) const {

      return Parent::maxEdgeId();

    }

    Node fromId(int id, Node) const {

      return Parent::nodeFromId(id);

    }

    Arc fromId(int id, Arc) const {

      return Parent::arcFromId(id);

    }

    Edge fromId(int id, Edge) const {

      return Parent::edgeFromId(id);

    }

    Node oppositeNode(const Node &n, const Edge &e) const {

      if( n == Parent::u(e))

	return Parent::v(e);

      else if( n == Parent::v(e))

	return Parent::u(e);

      else

	return INVALID;

    }

    Arc oppositeArc(const Arc &e) const {

      return Parent::direct(e, !Parent::direction(e));

    }

    using Parent::direct;

    Arc direct(const Edge &e, const Node &s) const {

      return Parent::direct(e, Parent::u(e) == s);

    }

    typedef AlterationNotifier<EdgeSetExtender, Arc> ArcNotifier;

    typedef AlterationNotifier<EdgeSetExtender, Edge> EdgeNotifier;

  protected:

    mutable ArcNotifier arc_notifier;

    mutable EdgeNotifier edge_notifier;

  public:

    using Parent::notifier;

    ArcNotifier& notifier(Arc) const {

      return arc_notifier;

    }

    EdgeNotifier& notifier(Edge) const {

      return edge_notifier;

    }

    class NodeIt : public Node { 

      const Graph* graph;

    public:

      NodeIt() {}

      NodeIt(Invalid i) : Node(i) { }

      explicit NodeIt(const Graph& _graph) : graph(&_graph) {

	_graph.first(static_cast<Node&>(*this));

      }

      NodeIt(const Graph& _graph, const Node& node) 

	: Node(node), graph(&_graph) {}

      NodeIt& operator++() { 

	graph->next(*this);

	return *this; 

      }

    };

    class ArcIt : public Arc { 

      const Graph* graph;

    public:

      ArcIt() { }

    class ArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      ArcIt() { }

      ArcIt(Invalid i) : Arc(i) { }

      explicit ArcIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

        _adaptor->first(static_cast<Arc&>(*this));

      }

      ArcIt(const Adaptor& adaptor, const Arc& e) :

        Arc(e), _adaptor(&adaptor) { }

      ArcIt& operator++() {

        _adaptor->next(*this);

        return *this;

      }

    };

    class OutArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      OutArcIt() { }

      OutArcIt(Invalid i) : Arc(i) { }

      OutArcIt(const Adaptor& adaptor, const Node& node)

        : _adaptor(&adaptor) {

        _adaptor->firstOut(*this, node);

      }

      OutArcIt(const Adaptor& adaptor, const Arc& arc)

        : Arc(arc), _adaptor(&adaptor) {}

      OutArcIt& operator++() {

        _adaptor->nextOut(*this);

        return *this;

      }

    };

    class InArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      InArcIt() { }

      InArcIt(Invalid i) : Arc(i) { }

      InArcIt(const Adaptor& adaptor, const Node& node)

        : _adaptor(&adaptor) {

        _adaptor->firstIn(*this, node);

      }

      InArcIt(const Adaptor& adaptor, const Arc& arc) :

        Arc(arc), _adaptor(&adaptor) {}

      InArcIt& operator++() {

        _adaptor->nextIn(*this);

        return *this;

      }

    };

    Node baseNode(const OutArcIt &e) const {

      return Parent::source(e);

    }

    Node runningNode(const OutArcIt &e) const {

      return Parent::target(e);

    }

    Node baseNode(const InArcIt &e) const {

      return Parent::target(e);

    }

    Node runningNode(const InArcIt &e) const {

      return Parent::source(e);

    }

  };

  template <typename _Graph>

  class GraphAdaptorExtender : public _Graph {

    typedef _Graph Parent;

  public:

    typedef _Graph Graph;

    typedef GraphAdaptorExtender Adaptor;

    typedef typename Parent::Node Node;

    typedef typename Parent::Arc Arc;

    typedef typename Parent::Edge Edge;

    // Graph extension

    int maxId(Node) const {

      return Parent::maxNodeId();

    }

    int maxId(Arc) const {

      return Parent::maxArcId();

    }

    int maxId(Edge) const {

      return Parent::maxEdgeId();

    }

    Node fromId(int id, Node) const {

      return Parent::nodeFromId(id);

    }

    Arc fromId(int id, Arc) const {

      return Parent::arcFromId(id);

    }

    Edge fromId(int id, Edge) const {

      return Parent::edgeFromId(id);

    }

    Node oppositeNode(const Node &n, const Edge &e) const {

      if( n == Parent::u(e))

        return Parent::v(e);

      else if( n == Parent::v(e))

        return Parent::u(e);

      else

        return INVALID;

    }

    Arc oppositeArc(const Arc &a) const {

      return Parent::direct(a, !Parent::direction(a));

    }

    using Parent::direct;

    Arc direct(const Edge &e, const Node &s) const {

      return Parent::direct(e, Parent::u(e) == s);

    }

    class NodeIt : public Node {

      const Adaptor* _adaptor;

    public:

      NodeIt() {}

      NodeIt(Invalid i) : Node(i) { }

      explicit NodeIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

        _adaptor->first(static_cast<Node&>(*this));

      }

      NodeIt(const Adaptor& adaptor, const Node& node)

        : Node(node), _adaptor(&adaptor) {}

      NodeIt& operator++() {

        _adaptor->next(*this);

        return *this;

      }

    };

    class ArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      ArcIt() { }

      ArcIt(Invalid i) : Arc(i) { }

      explicit ArcIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

        _adaptor->first(static_cast<Arc&>(*this));

      }

      ArcIt(const Adaptor& adaptor, const Arc& e) :

        Arc(e), _adaptor(&adaptor) { }

      ArcIt& operator++() {

        _adaptor->next(*this);

        return *this;

      }

    };

    class OutArcIt : public Arc {