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    69       /// \brief Assignment operator.  | 
    69       /// \brief Assignment operator.  | 
    70       ///  | 
    70       ///  | 
    71       /// Assignment operator for the item.  | 
    71       /// Assignment operator for the item.  | 
    72       GraphItem& operator=(const GraphItem&) { return *this; } | 
    72       GraphItem& operator=(const GraphItem&) { return *this; } | 
    73   | 
    73   | 
         | 
    74       /// \brief Assignment operator for INVALID.  | 
         | 
    75       ///  | 
         | 
    76       /// This operator makes the item invalid.  | 
         | 
    77       GraphItem& operator=(Invalid) { return *this; } | 
         | 
    78   | 
    74       /// \brief Equality operator.  | 
    79       /// \brief Equality operator.  | 
    75       ///  | 
    80       ///  | 
    76       /// Equality operator.  | 
    81       /// Equality operator.  | 
    77       bool operator==(const GraphItem&) const { return false; } | 
    82       bool operator==(const GraphItem&) const { return false; } | 
    78   | 
    83   | 
    94   | 
    99   | 
    95       template<typename _GraphItem>  | 
   100       template<typename _GraphItem>  | 
    96       struct Constraints { | 
   101       struct Constraints { | 
    97         void constraints() { | 
   102         void constraints() { | 
    98           _GraphItem i1;  | 
   103           _GraphItem i1;  | 
         | 
   104           i1=INVALID;  | 
    99           _GraphItem i2 = i1;  | 
   105           _GraphItem i2 = i1;  | 
   100           _GraphItem i3 = INVALID;  | 
   106           _GraphItem i3 = INVALID;  | 
   101   | 
   107   | 
   102           i1 = i2 = i3;  | 
   108           i1 = i2 = i3;  | 
   103   | 
   109   | 
   219         ///  | 
   225         ///  | 
   220         /// Constructor for conversion from an arc.  | 
   226         /// Constructor for conversion from an arc.  | 
   221         /// Besides the core graph item functionality each arc should  | 
   227         /// Besides the core graph item functionality each arc should  | 
   222         /// be convertible to the represented edge.  | 
   228         /// be convertible to the represented edge.  | 
   223         Edge(const Arc&) {} | 
   229         Edge(const Arc&) {} | 
   224   | 
   230      };  | 
   225         /// \brief Assign an arc to an edge.  | 
         | 
   226         ///  | 
         | 
   227         /// This function assigns an arc to an edge.  | 
         | 
   228         /// Besides the core graph item functionality each arc should  | 
         | 
   229         /// be convertible to the represented edge.  | 
         | 
   230         Edge& operator=(const Arc&) { return *this; } | 
         | 
   231       };  | 
         | 
   232   | 
   231   | 
   233       /// \brief Return one end node of an edge.  | 
   232       /// \brief Return one end node of an edge.  | 
   234       ///  | 
   233       ///  | 
   235       /// This function returns one end node of an edge.  | 
   234       /// This function returns one end node of an edge.  | 
   236       Node u(const Edge&) const { return INVALID; } | 
   235       Node u(const Edge&) const { return INVALID; } | 
   351       struct Constraints { | 
   350       struct Constraints { | 
   352   | 
   351   | 
   353         void constraints() { | 
   352         void constraints() { | 
   354           checkConcept<Base, _Digraph >();  | 
   353           checkConcept<Base, _Digraph >();  | 
   355           typename _Digraph::Node node;  | 
   354           typename _Digraph::Node node;  | 
         | 
   355           node=INVALID;  | 
   356           int nid = digraph.id(node);  | 
   356           int nid = digraph.id(node);  | 
   357           nid = digraph.id(node);  | 
   357           nid = digraph.id(node);  | 
   358           node = digraph.nodeFromId(nid);  | 
   358           node = digraph.nodeFromId(nid);  | 
   359           typename _Digraph::Arc arc;  | 
   359           typename _Digraph::Arc arc;  | 
         | 
   360           arc=INVALID;  | 
   360           int eid = digraph.id(arc);  | 
   361           int eid = digraph.id(arc);  | 
   361           eid = digraph.id(arc);  | 
   362           eid = digraph.id(arc);  | 
   362           arc = digraph.arcFromId(eid);  | 
   363           arc = digraph.arcFromId(eid);  | 
   363   | 
   364   | 
   364           nid = digraph.maxNodeId();  | 
   365           nid = digraph.maxNodeId();  |