namespace lemon {

 namespace lemon {

   class FullDigraphBase {

   class FullDigraphBase {

   public:

   public:

     class Node;

     class Node;

     class Arc;

     class Arc;

   protected:

   protected:

   /// moreover \c FullGraph does not contain a loop arc for each

   /// moreover \c FullGraph does not contain a loop arc for each

   /// node as \c FullDigraph does.

   /// node as \c FullDigraph does.

   ///

   ///

   /// \sa FullGraph

   /// \sa FullGraph

   class FullDigraph : public ExtendedFullDigraphBase {

   class FullDigraph : public ExtendedFullDigraphBase {

   public:

   public:

     /// \brief Constructor

     /// \brief Constructor

     FullDigraph() { construct(0); }

     FullDigraph() { construct(0); }

     /// \brief Constructor

     /// \brief Constructor

     int arcNum() const { return Parent::arcNum(); }

     int arcNum() const { return Parent::arcNum(); }

   };

   };

   class FullGraphBase {

   class FullGraphBase {

   public:

   public:

     typedef FullGraphBase Graph;

     typedef FullGraphBase Graph;

     class Node;

     class Node;

     class Arc;

     class Arc;

     class Edge;

     class Edge;

   protected:

   protected:

     FullGraphBase() {}

     FullGraphBase() {}

     void construct(int n) { _node_num = n; _edge_num = n * (n - 1) / 2; }

     void construct(int n) { _node_num = n; _edge_num = n * (n - 1) / 2; }

   /// moreover \c FullGraph does not contain a loop arc for each

   /// moreover \c FullGraph does not contain a loop arc for each

   /// node as \c FullDigraph does.

   /// node as \c FullDigraph does.

   ///

   ///

   /// \sa FullDigraph

   /// \sa FullDigraph

   class FullGraph : public ExtendedFullGraphBase {

   class FullGraph : public ExtendedFullGraphBase {

   public:

   public:

     /// \brief Constructor

     /// \brief Constructor

     FullGraph() { construct(0); }

     FullGraph() { construct(0); }

     /// \brief Constructor

     /// \brief Constructor