# HG changeset patch
# User alpar
# Date 1078937177 0
# Node ID c5fbd2c1d75f99786f6c49b338f908242af81365
# Parent  abfae454c3b5b43740ecef8f237e0afd6b9b5049
Emtygraph with the new interface

diff -r abfae454c3b5 -r c5fbd2c1d75f src/work/alpar/emptygraph.h
--- a/src/work/alpar/emptygraph.h	Wed Mar 10 16:43:50 2004 +0000
+++ b/src/work/alpar/emptygraph.h	Wed Mar 10 16:46:17 2004 +0000
@@ -1,144 +1,234 @@
 // -*-mode: c++; -*-
 
-class EmptyGraph
-{
-public:
+#include <invalid.h>
 
-  class NodeIt {
+/// The namespace of HugoLib
+namespace hugo {
+
+  // @defgroup empty_graph The EmptyGraph class
+  // @{
+
+  /// An empty graph class.
+  
+  /// This class provides all the common features of a grapf structure,
+  /// however completely without implementations or real data structures
+  /// behind the interface.
+  /// All graph algorithms should compile with this class, but it will not
+  /// run properly, of course.
+  ///
+  /// It can be used for checking the interface compatibility,
+  /// or it can serve as a skeleton of a new graph structure.
+
+  class EmptyGraph
+  {
   public:
-    NodeIt() {}   //FIXME
-    //NodeIt(const NodeIt &) {} 
-    bool operator==(NodeIt n) const {} //FIXME
-    bool operator!=(NodeIt n) const {} //FIXME
-  };
     
-  class EachNodeIt : public NodeIt {
-  public:
-    EachNodeIt() {} //FIXME
-    EachNodeIt(const EmptyGraph &) const {}
-    EachNodeIt(const EachNodeIt &) const {} //FIXME
-  };
+    /// The base type of the node iterators.
+    class Node {
+    public:
+      /// @warning The default constructor sets the iterator
+      /// to an undefined value.
+      Node() {}   //FIXME
+      /// Initialize the iterator to be invalid
+      Node(Invalid) {};
+      //Node(const Node &) {} 
+      bool operator==(Node n) const { return true; } //FIXME
+      bool operator!=(Node n) const { return true; } //FIXME
+    };
     
-  class EdgeIt {
-    EdgeIt() {}   //FIXME
-    //EdgeIt(const EdgeIt &) {} 
-    bool operator==(EdgeIt n) const {} //FIXME
-    bool operator!=(EdgeIt n) const {} //FIXME    
-  };
+    /// This iterator goes through each node.
+    class NodeIt : public Node {
+    public:
+      /// @warning The default constructor sets the iterator
+      /// to an undefined value.
+      NodeIt() {} //FIXME
+      /// Initialize the iterator to be invalid
+      NodeIt(Invalid) {};
+      /// Sets the iterator to the first node of \c G.
+      NodeIt(const EmptyGraph &G) {}
+      NodeIt(const NodeIt &) {} //FIXME
+    };
+    
+    
+    /// The base type of the edge iterators.
+    class Edge {
+    public:
+      /// @warning The default constructor sets the iterator
+      /// to an undefined value.
+      Edge() {}   //FIXME
+      /// Initialize the iterator to be invalid
+      Edge(Invalid) {};
+      //Edge(const Edge &) {} 
+      bool operator==(Edge n) const { return true; } //FIXME
+      bool operator!=(Edge n) const { return true; } //FIXME    
+    };
+    
+    /// This iterator goes trought the outgoing edges of a certain graph.
+    
+    class OutEdgeIt : public Edge {
+    public:
+      /// @warning The default constructor sets the iterator
+      /// to an undefined value.
+      OutEdgeIt() {}
+      /// Initialize the iterator to be invalid
+      OutEdgeIt(Invalid) {};
+      /// This constructor sets the iterator to first outgoing edge.
+    
+      /// This constructor set the iterator to the first outgoing edge of
+      /// node
+      ///@param n the node
+      ///@param G the graph
+      OutEdgeIt(const EmptyGraph & G, Node n) {}
+    };
+
+    class InEdgeIt : public Edge {
+    public:
+      /// @warning The default constructor sets the iterator
+      /// to an undefined value.
+      InEdgeIt() {}
+      /// Initialize the iterator to be invalid
+      InEdgeIt(Invalid) {};
+      InEdgeIt(const EmptyGraph &, Node) {}    
+    };
+    //  class SymEdgeIt : public Edge {};
+    class EdgeIt : public Edge {
+    public:
+      /// @warning The default constructor sets the iterator
+      /// to an undefined value.
+      EdgeIt() {}
+      /// Initialize the iterator to be invalid
+      EdgeIt(Invalid) {};
+      EdgeIt(const EmptyGraph &) {}
+    };
+
+    /// First node of the graph.
+
+    /// \post \c i and the return value will be the first node.
+    ///
+    NodeIt &first(NodeIt &i) const { return i;}
+
+    /// The first outgoing edge.
+    InEdgeIt &first(InEdgeIt &i, Node n) const { return i;}
+    /// The first incoming edge.
+    OutEdgeIt &first(OutEdgeIt &i, Node n) const { return i;}
+    //  SymEdgeIt &first(SymEdgeIt &, Node) const { return i;}
+    /// The first edge of the Graph.
+    EdgeIt &first(EdgeIt &i) const { return i;}
+
+//     Node getNext(Node) const {}
+//     InEdgeIt getNext(InEdgeIt) const {}
+//     OutEdgeIt getNext(OutEdgeIt) const {}
+//     //SymEdgeIt getNext(SymEdgeIt) const {}
+//     EdgeIt getNext(EdgeIt) const {}
+
+    /// Go to the next node.
+    Node &next(Node &i) const { return i;}
+    /// Go to the next incoming edge.
+    InEdgeIt &next(InEdgeIt &i) const { return i;}
+    /// Go to the next outgoing edge.
+    OutEdgeIt &next(OutEdgeIt &i) const { return i;}
+    //SymEdgeIt &next(SymEdgeIt &) const {}
+    /// Go to the next edge.
+    EdgeIt &next(EdgeIt &i) const { return i;}
+
+    ///Gives back the head node of an edge.
+    Node head(Edge) const { return INVALID; }
+    ///Gives back the tail node of an edge.
+    Node tail(Edge) const { return INVALID; }
   
-  class OutEdgeIt : public EdgeIt {
-    OutEdgeIt() {}
-    OutEdgeIt(const EmptyGraph &, NodeIt) {}
+    //   Node aNode(InEdgeIt) const {}
+    //   Node aNode(OutEdgeIt) const {}
+    //   Node aNode(SymEdgeIt) const {}
+
+    //   Node bNode(InEdgeIt) const {}
+    //   Node bNode(OutEdgeIt) const {}
+    //   Node bNode(SymEdgeIt) const {}
+
+    /// Checks if a node iterator is valid
+    bool valid(const Node) const { return true;};
+    /// Checks if an edge iterator is valid
+    bool valid(const Edge) const { return true;};
+
+    ///Gives back the \e id of a node.
+    int id(const Node) const { return 0;};
+    ///Gives back the \e id of an edge.
+    int id(const Edge) const { return 0;};
+
+    //void setInvalid(Node &) const {};
+    //void setInvalid(Edge &) const {};
+  
+    Node addNode() { return INVALID;}
+    Edge addEdge(Node tail, Node head) { return INVALID;}
+    
+    void erase(Node n) {}
+    void erase(Edge e) {}
+
+    void clear() {}
+
+    int nodeNum() { return 0;}
+    int edgeNum() { return 0;}
+
+    EmptyGraph() {};
+    EmptyGraph(const EmptyGraph &G) {};
+  
+  
+
+    ///Read/write map from the nodes to type \c T.
+    template<class T> class NodeMap
+    {
+    public:
+      typedef T ValueType;
+      typedef Node KeyType;
+
+      NodeMap(const EmptyGraph &G) {}
+      NodeMap(const EmptyGraph &G, T t) {}
+
+      void set(Node i, T t) {}
+      T get(Node i) const {return *(T*)NULL;}  //FIXME: Is it necessary
+      T &operator[](Node i) {return *(T*)NULL;}
+      const T &operator[](Node i) const {return *(T*)NULL;}
+
+      void update() {}
+      void update(T a) {}   //FIXME: Is it necessary
+    };
+
+    ///Read/write map from the edges to type \c T.
+    template<class T> class EdgeMap
+    {
+    public:
+      typedef T ValueType;
+      typedef Edge KeyType;
+
+      EdgeMap(const EmptyGraph &G) {}
+      EdgeMap(const EmptyGraph &G, T t) {}
+    
+      void set(Edge i, T t) {}
+      T get(Edge i) const {return *(T*)NULL;}
+      T &operator[](Edge i) {return *(T*)NULL;}
+    
+      void update() {}
+      void update(T a) {}   //FIXME: Is it necessary
+    };
   };
 
-  class InEdgeIt : public EdgeIt {
-    InEdgeIt() {}
-    InEdgeIt(const EmptyGraph &, NodeIt) {}    
-  };
-  //  class SymEdgeIt : public EdgeIt {};
-  class EachEdgeIt : public EdgeIt {
-    EachEdgeIt() {}
-    EachEdgeIt(const EmptyGraph &) {}
-  };
+  // @}
 
-  EachNodeIt &getFirst(EachNodeIt &) const {}
-  InEdgeIt &getFirst(InEdgeIt &, NodeIt) const {}
-  OutEdgeIt &getFirst(OutEdgeIt &, NodeIt) const {}
-  //  SymEdgeIt &getFirst(SymEdgeIt &, NodeIt) const {}
-  EachEdgeIt &getFirst(EachEdgeIt &) const {}
+};
 
-  NodeIt getNext(NodeIt) const {}
-  InEdgeIt getNext(InEdgeIt) const {}
-  OutEdgeIt getNext(OutEdgeIt) const {}
-  //SymEdgeIt getNext(SymEdgeIt) const {}
-  EachEdgeIt getNext(EachEdgeIt) const {}
-
-  NodeIt &next(NodeIt &) const {}
-  InEdgeIt &next(InEdgeIt &) const {}
-  OutEdgeIt &next(OutEdgeIt &) const {}
-  //SymEdgeIt &next(SymEdgeIt &) const {}
-  EachEdgeIt &next(EachEdgeIt &) const {}
-
-  NodeIt head(EdgeIt) const {}
-  NodeIt tail(EdgeIt) const {}
-  
-//   NodeIt aNode(InEdgeIt) const {}
-//   NodeIt aNode(OutEdgeIt) const {}
-//   NodeIt aNode(SymEdgeIt) const {}
-
-//   NodeIt bNode(InEdgeIt) const {}
-//   NodeIt bNode(OutEdgeIt) const {}
-//   NodeIt bNode(SymEdgeIt) const {}
-
-  bool valid(const NodeIt) const {};
-  bool valid(const EdgeIt) const {};
-
-  int id(const NodeIt) const {};
-  int id(const EdgeIt) const {};
-
-  //void setInvalid(NodeIt &) const {};
-  //void setInvalid(EdgeIt &) const {};
-  
-  NodeIt addNode() {}
-  EdgeIt addEdge(NodeIt tail, NodeIt head) {}
-    
-  void erase(NodeIt n) {}
-  void erase(EdgeIt e) {}
-
-  void clear() {}
-
-  int nodeNum() {}
-  int edgeNum() {}
-
-  template<class T> class NodeMap
-  {
-  public:
-    typedef T ValueType;
-    typedef NodeIt KeyType;
-
-    NodeMap(const Graph &G) {}
-    NodeMap(const Graph &G, T t) {}
-
-    void set(NodeIt i, T t) {}
-    T get(NodeIt i) const {}  //FIXME: Is it necessary
-    T &operator[](NodeIt i) {}
-    const T &operator[](NodeIt i) const {}
-
-    update() {}
-    update(T a) {}   //FIXME: Is it necessary
-  };
-
-  template<class T> class EdgeMap
-  {
-  public:
-    typedef T ValueType;
-    typedef EdgeIt KeyType;
-
-    EdgeMap(const Graph &G) {}
-    EdgeMap(const Graph &G, T t) {}
-    
-    void set(EdgeIt i, T t) {}
-    T get(EdgeIt i) const {}
-    T &operator[](EdgeIt i) {}
-    
-    update() {}
-    update(T a) {}   //FIXME: Is it necessary
-  };
-};
 
 
 // class EmptyBipGraph : public EmptyGraph
 // {
-//   class ANodeIt {};
-//   class BNodeIt {};
+//   class ANode {};
+//   class BNode {};
 
-//   ANodeIt &next(ANodeIt &) {}
-//   BNodeIt &next(BNodeIt &) {}
+//   ANode &next(ANode &) {}
+//   BNode &next(BNode &) {}
 
-//   ANodeIt &getFirst(ANodeIt &) const {}
-//   BNodeIt &getFirst(BNodeIt &) const {}
+//   ANode &getFirst(ANode &) const {}
+//   BNode &getFirst(BNode &) const {}
 
 //   enum NodeClass { A = 0, B = 1 };
-//   NodeClass getClass(NodeIt n) {}
+//   NodeClass getClass(Node n) {}
 
 // }