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Changes in / [59:4ab73d92f0fb:56:9597aa501c7c] in lemon-main


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Files:
15 deleted
3 edited

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  • lemon/Makefile.am

    r58 r32  
    1717lemon_HEADERS += \
    1818        lemon/dim2.h \
    19         lemon/maps.h \
    2019        lemon/random.h \
    2120        lemon/list_graph.h \
    … …  
    2322
    2423bits_HEADERS += \
    25         lemon/bits/alteration_notifier.h \
    26         lemon/bits/array_map.h \
    27         lemon/bits/base_extender.h \
    28         lemon/bits/default_map.h \
    29         lemon/bits/graph_extender.h \
    3024        lemon/bits/invalid.h \
    31         lemon/bits/map_extender.h \
    32         lemon/bits/traits.h \
    33         lemon/bits/utility.h \
    34         lemon/bits/vector_map.h
     25        lemon/bits/utility.h
    3526
    36 concept_HEADERS += \
    37         lemon/concept_check.h \
    38         lemon/concepts/digraph.h \
    39         lemon/concepts/graph.h \
    40         lemon/concepts/maps.h \
    41         lemon/concepts/graph_components.h
     27concept_HEADERS +=

  • lemon/list_graph.h

    r57 r39  
    1717 */
    1818
    19 #ifndef LEMON_LIST_GRAPH_H
    20 #define LEMON_LIST_GRAPH_H
    21 
    22 ///\ingroup graphs
    23 ///\file
    24 ///\brief ListDigraph, ListGraph classes.
    25 
    26 #include <lemon/bits/graph_extender.h>
    27 
    28 #include <vector>
    29 #include <list>
    30 
    31 namespace lemon {
    32 
    33   class ListDigraphBase {
    34 
    35   protected:
    36     struct NodeT {
    37       int first_in, first_out;
    38       int prev, next;
    39     };
    40  
    41     struct ArcT {
    42       int target, source;
    43       int prev_in, prev_out;
    44       int next_in, next_out;
    45     };
    46 
    47     std::vector<NodeT> nodes;
    48 
    49     int first_node;
    50 
    51     int first_free_node;
    52 
    53     std::vector<ArcT> arcs;
    54 
    55     int first_free_arc;
    56    
    57   public:
    58    
    59     typedef ListDigraphBase Digraph;
    60    
    61     class Node {
    62       friend class ListDigraphBase;
    63     protected:
    64 
    65       int id;
    66       explicit Node(int pid) { id = pid;}
    67 
    68     public:
    69       Node() {}
    70       Node (Invalid) { id = -1; }
    71       bool operator==(const Node& node) const {return id == node.id;}
    72       bool operator!=(const Node& node) const {return id != node.id;}
    73       bool operator<(const Node& node) const {return id < node.id;}
    74     };
    75 
    76     class Arc {
    77       friend class ListDigraphBase;
    78     protected:
    79 
    80       int id;
    81       explicit Arc(int pid) { id = pid;}
    82 
    83     public:
    84       Arc() {}
    85       Arc (Invalid) { id = -1; }
    86       bool operator==(const Arc& arc) const {return id == arc.id;}
    87       bool operator!=(const Arc& arc) const {return id != arc.id;}
    88       bool operator<(const Arc& arc) const {return id < arc.id;}
    89     };
    90 
    91 
    92 
    93     ListDigraphBase()
    94       : nodes(), first_node(-1),
    95         first_free_node(-1), arcs(), first_free_arc(-1) {}
    96 
    97    
    98     int maxNodeId() const { return nodes.size()-1; }
    99     int maxArcId() const { return arcs.size()-1; }
    100 
    101     Node source(Arc e) const { return Node(arcs[e.id].source); }
    102     Node target(Arc e) const { return Node(arcs[e.id].target); }
    103 
    104 
    105     void first(Node& node) const {
    106       node.id = first_node;
    107     }
    108 
    109     void next(Node& node) const {
    110       node.id = nodes[node.id].next;
    111     }
    112 
    113 
    114     void first(Arc& e) const {
    115       int n;
    116       for(n = first_node;
    117           n!=-1 && nodes[n].first_in == -1;
    118           n = nodes[n].next);
    119       e.id = (n == -1) ? -1 : nodes[n].first_in;
    120     }
    121 
    122     void next(Arc& arc) const {
    123       if (arcs[arc.id].next_in != -1) {
    124         arc.id = arcs[arc.id].next_in;
    125       } else {
    126         int n;
    127         for(n = nodes[arcs[arc.id].target].next;
    128           n!=-1 && nodes[n].first_in == -1;
    129           n = nodes[n].next);
    130         arc.id = (n == -1) ? -1 : nodes[n].first_in;
    131       }     
    132     }
    133 
    134     void firstOut(Arc &e, const Node& v) const {
    135       e.id = nodes[v.id].first_out;
    136     }
    137     void nextOut(Arc &e) const {
    138       e.id=arcs[e.id].next_out;
    139     }
    140 
    141     void firstIn(Arc &e, const Node& v) const {
    142       e.id = nodes[v.id].first_in;
    143     }
    144     void nextIn(Arc &e) const {
    145       e.id=arcs[e.id].next_in;
    146     }
    147 
    148    
    149     static int id(Node v) { return v.id; }
    150     static int id(Arc e) { return e.id; }
    151 
    152     static Node nodeFromId(int id) { return Node(id);}
    153     static Arc arcFromId(int id) { return Arc(id);}
    154 
    155     Node addNode() {     
    156       int n;
    157      
    158       if(first_free_node==-1) {
    159         n = nodes.size();
    160         nodes.push_back(NodeT());
    161       } else {
    162         n = first_free_node;
    163         first_free_node = nodes[n].next;
    164       }
    165      
    166       nodes[n].next = first_node;
    167       if(first_node != -1) nodes[first_node].prev = n;
    168       first_node = n;
    169       nodes[n].prev = -1;
    170      
    171       nodes[n].first_in = nodes[n].first_out = -1;
    172      
    173       return Node(n);
    174     }
    175    
    176     Arc addArc(Node u, Node v) {
    177       int n;     
    178 
    179       if (first_free_arc == -1) {
    180         n = arcs.size();
    181         arcs.push_back(ArcT());
    182       } else {
    183         n = first_free_arc;
    184         first_free_arc = arcs[n].next_in;
    185       }
    186      
    187       arcs[n].source = u.id;
    188       arcs[n].target = v.id;
    189 
    190       arcs[n].next_out = nodes[u.id].first_out;
    191       if(nodes[u.id].first_out != -1) {
    192         arcs[nodes[u.id].first_out].prev_out = n;
    193       }
    194      
    195       arcs[n].next_in = nodes[v.id].first_in;
    196       if(nodes[v.id].first_in != -1) {
    197         arcs[nodes[v.id].first_in].prev_in = n;
    198       }
    199      
    200       arcs[n].prev_in = arcs[n].prev_out = -1;
    201        
    202       nodes[u.id].first_out = nodes[v.id].first_in = n;
    203 
    204       return Arc(n);
    205     }
    206    
    207     void erase(const Node& node) {
    208       int n = node.id;
    209      
    210       if(nodes[n].next != -1) {
    211         nodes[nodes[n].next].prev = nodes[n].prev;
    212       }
    213      
    214       if(nodes[n].prev != -1) {
    215         nodes[nodes[n].prev].next = nodes[n].next;
    216       } else {
    217         first_node = nodes[n].next;
    218       }
    219      
    220       nodes[n].next = first_free_node;
    221       first_free_node = n;
    222 
    223     }
    224    
    225     void erase(const Arc& arc) {
    226       int n = arc.id;
    227      
    228       if(arcs[n].next_in!=-1) {
    229         arcs[arcs[n].next_in].prev_in = arcs[n].prev_in;
    230       }
    231 
    232       if(arcs[n].prev_in!=-1) {
    233         arcs[arcs[n].prev_in].next_in = arcs[n].next_in;
    234       } else {
    235         nodes[arcs[n].target].first_in = arcs[n].next_in;
    236       }
    237 
    238      
    239       if(arcs[n].next_out!=-1) {
    240         arcs[arcs[n].next_out].prev_out = arcs[n].prev_out;
    241       }
    242 
    243       if(arcs[n].prev_out!=-1) {
    244         arcs[arcs[n].prev_out].next_out = arcs[n].next_out;
    245       } else {
    246         nodes[arcs[n].source].first_out = arcs[n].next_out;
    247       }
    248      
    249       arcs[n].next_in = first_free_arc;
    250       first_free_arc = n;     
    251 
    252     }
    253 
    254     void clear() {
    255       arcs.clear();
    256       nodes.clear();
    257       first_node = first_free_node = first_free_arc = -1;
    258     }
    259 
    260   protected:
    261     void changeTarget(Arc e, Node n)
    262     {
    263       if(arcs[e.id].next_in != -1)
    264         arcs[arcs[e.id].next_in].prev_in = arcs[e.id].prev_in;
    265       if(arcs[e.id].prev_in != -1)
    266         arcs[arcs[e.id].prev_in].next_in = arcs[e.id].next_in;
    267       else nodes[arcs[e.id].target].first_in = arcs[e.id].next_in;
    268       if (nodes[n.id].first_in != -1) {
    269         arcs[nodes[n.id].first_in].prev_in = e.id;
    270       }
    271       arcs[e.id].target = n.id;
    272       arcs[e.id].prev_in = -1;
    273       arcs[e.id].next_in = nodes[n.id].first_in;
    274       nodes[n.id].first_in = e.id;
    275     }
    276     void changeSource(Arc e, Node n)
    277     {
    278       if(arcs[e.id].next_out != -1)
    279         arcs[arcs[e.id].next_out].prev_out = arcs[e.id].prev_out;
    280       if(arcs[e.id].prev_out != -1)
    281         arcs[arcs[e.id].prev_out].next_out = arcs[e.id].next_out;
    282       else nodes[arcs[e.id].source].first_out = arcs[e.id].next_out;
    283       if (nodes[n.id].first_out != -1) {
    284         arcs[nodes[n.id].first_out].prev_out = e.id;
    285       }
    286       arcs[e.id].source = n.id;
    287       arcs[e.id].prev_out = -1;
    288       arcs[e.id].next_out = nodes[n.id].first_out;
    289       nodes[n.id].first_out = e.id;
    290     }
    291 
    292   };
    293 
    294   typedef DigraphExtender<ListDigraphBase> ExtendedListDigraphBase;
    295 
    296   /// \addtogroup digraphs
    297   /// @{
    298 
    299   ///A list digraph class.
    300 
    301   ///This is a simple and fast digraph implementation.
    302   ///
    303   ///It conforms to the \ref concepts::Digraph "Digraph concept" and it
    304   ///also provides several additional useful extra functionalities.
    305   ///The most of the member functions and nested classes are
    306   ///documented only in the concept class.
    307   ///
    308   ///An important extra feature of this digraph implementation is that
    309   ///its maps are real \ref concepts::ReferenceMap "reference map"s.
    310   ///
    311   ///\sa concepts::Digraph.
    312 
    313   class ListDigraph : public ExtendedListDigraphBase {
    314   private:
    315     ///ListDigraph is \e not copy constructible. Use DigraphCopy() instead.
    316    
    317     ///ListDigraph is \e not copy constructible. Use DigraphCopy() instead.
    318     ///
    319     ListDigraph(const ListDigraph &) :ExtendedListDigraphBase() {};
    320     ///\brief Assignment of ListDigraph to another one is \e not allowed.
    321     ///Use DigraphCopy() instead.
    322 
    323     ///Assignment of ListDigraph to another one is \e not allowed.
    324     ///Use DigraphCopy() instead.
    325     void operator=(const ListDigraph &) {}
    326   public:
    327 
    328     typedef ExtendedListDigraphBase Parent;
    329 
    330     /// Constructor
    331    
    332     /// Constructor.
    333     ///
    334     ListDigraph() {}
    335 
    336     ///Add a new node to the digraph.
    337    
    338     /// \return the new node.
    339     ///
    340     Node addNode() { return Parent::addNode(); }
    341 
    342     ///Add a new arc to the digraph.
    343    
    344     ///Add a new arc to the digraph with source node \c s
    345     ///and target node \c t.
    346     ///\return the new arc.
    347     Arc addArc(const Node& s, const Node& t) {
    348       return Parent::addArc(s, t);
    349     }
    350 
    351     /// Changes the target of \c e to \c n
    352 
    353     /// Changes the target of \c e to \c n
    354     ///
    355     ///\note The <tt>ArcIt</tt>s and <tt>OutArcIt</tt>s referencing
    356     ///the changed arc remain valid. However <tt>InArcIt</tt>s are
    357     ///invalidated.
    358     ///\warning This functionality cannot be used together with the Snapshot
    359     ///feature.
    360     void changeTarget(Arc e, Node n) {
    361       Parent::changeTarget(e,n);
    362     }
    363     /// Changes the source of \c e to \c n
    364 
    365     /// Changes the source of \c e to \c n
    366     ///
    367     ///\note The <tt>ArcIt</tt>s and <tt>InArcIt</tt>s referencing
    368     ///the changed arc remain valid. However <tt>OutArcIt</tt>s are
    369     ///invalidated.
    370     ///\warning This functionality cannot be used together with the Snapshot
    371     ///feature.
    372     void changeSource(Arc e, Node n) {
    373       Parent::changeSource(e,n);
    374     }
    375 
    376     /// Invert the direction of an arc.
    377 
    378     ///\note The <tt>ArcIt</tt>s referencing the changed arc remain
    379     ///valid. However <tt>OutArcIt</tt>s and <tt>InArcIt</tt>s are
    380     ///invalidated.
    381     ///\warning This functionality cannot be used together with the Snapshot
    382     ///feature.
    383     void reverseArc(Arc e) {
    384       Node t=target(e);
    385       changeTarget(e,source(e));
    386       changeSource(e,t);
    387     }
    388 
    389     /// Using this it is possible to avoid the superfluous memory
    390     /// allocation: if you know that the digraph you want to build will
    391     /// be very large (e.g. it will contain millions of nodes and/or arcs)
    392     /// then it is worth reserving space for this amount before starting
    393     /// to build the digraph.
    394     /// \sa reserveArc
    395     void reserveNode(int n) { nodes.reserve(n); };
    396 
    397     /// \brief Using this it is possible to avoid the superfluous memory
    398     /// allocation.
    399 
    400     /// Using this it is possible to avoid the superfluous memory
    401     /// allocation: if you know that the digraph you want to build will
    402     /// be very large (e.g. it will contain millions of nodes and/or arcs)
    403     /// then it is worth reserving space for this amount before starting
    404     /// to build the digraph.
    405     /// \sa reserveNode
    406     void reserveArc(int m) { arcs.reserve(m); };
    407 
    408     ///Contract two nodes.
    409 
    410     ///This function contracts two nodes.
    411     ///
    412     ///Node \p b will be removed but instead of deleting
    413     ///incident arcs, they will be joined to \p a.
    414     ///The last parameter \p r controls whether to remove loops. \c true
    415     ///means that loops will be removed.
    416     ///
    417     ///\note The <tt>ArcIt</tt>s
    418     ///referencing a moved arc remain
    419     ///valid. However <tt>InArcIt</tt>s and <tt>OutArcIt</tt>s
    420     ///may be invalidated.
    421     ///\warning This functionality cannot be used together with the Snapshot
    422     ///feature.
    423     void contract(Node a, Node b, bool r = true)
    424     {
    425       for(OutArcIt e(*this,b);e!=INVALID;) {
    426         OutArcIt f=e;
    427         ++f;
    428         if(r && target(e)==a) erase(e);
    429         else changeSource(e,a);
    430         e=f;
    431       }
    432       for(InArcIt e(*this,b);e!=INVALID;) {
    433         InArcIt f=e;
    434         ++f;
    435         if(r && source(e)==a) erase(e);
    436         else changeTarget(e,a);
    437         e=f;
    438       }
    439       erase(b);
    440     }
    441 
    442     ///Split a node.
    443 
    444     ///This function splits a node. First a new node is added to the digraph,
    445     ///then the source of each outgoing arc of \c n is moved to this new node.
    446     ///If \c connect is \c true (this is the default value), then a new arc
    447     ///from \c n to the newly created node is also added.
    448     ///\return The newly created node.
    449     ///
    450     ///\note The <tt>ArcIt</tt>s referencing a moved arc remain
    451     ///valid. However <tt>InArcIt</tt>s and <tt>OutArcIt</tt>s may
    452     ///be invalidated. 
    453     ///
    454     ///\warning This functionality cannot be used together with the
    455     ///Snapshot feature.  \todo It could be implemented in a bit
    456     ///faster way.
    457     Node split(Node n, bool connect = true) {
    458       Node b = addNode();
    459       for(OutArcIt e(*this,n);e!=INVALID;) {
    460         OutArcIt f=e;
    461         ++f;
    462         changeSource(e,b);
    463         e=f;
    464       }
    465       if (connect) addArc(n,b);
    466       return b;
    467     }
    468      
    469     ///Split an arc.
    470 
    471     ///This function splits an arc. First a new node \c b is added to
    472     ///the digraph, then the original arc is re-targeted to \c
    473     ///b. Finally an arc from \c b to the original target is added.
    474     ///\return The newly created node. 
    475     ///\warning This functionality
    476     ///cannot be used together with the Snapshot feature.
    477     Node split(Arc e) {
    478       Node b = addNode();
    479       addArc(b,target(e));
    480       changeTarget(e,b);
    481       return b;
    482     }
    483      
    484     /// \brief Class to make a snapshot of the digraph and restore
    485     /// to it later.
    486     ///
    487     /// Class to make a snapshot of the digraph and to restore it
    488     /// later.
    489     ///
    490     /// The newly added nodes and arcs can be removed using the
    491     /// restore() function.
    492     ///
    493     /// \warning Arc and node deletions cannot be restored. This
    494     /// events invalidate the snapshot.
    495     class Snapshot {
    496     protected:
    497 
    498       typedef Parent::NodeNotifier NodeNotifier;
    499 
    500       class NodeObserverProxy : public NodeNotifier::ObserverBase {
    501       public:
    502 
    503         NodeObserverProxy(Snapshot& _snapshot)
    504           : snapshot(_snapshot) {}
    505 
    506         using NodeNotifier::ObserverBase::attach;
    507         using NodeNotifier::ObserverBase::detach;
    508         using NodeNotifier::ObserverBase::attached;
    509        
    510       protected:
    511        
    512         virtual void add(const Node& node) {
    513           snapshot.addNode(node);
    514         }
    515         virtual void add(const std::vector<Node>& nodes) {
    516           for (int i = nodes.size() - 1; i >= 0; ++i) {
    517             snapshot.addNode(nodes[i]);
    518           }
    519         }
    520         virtual void erase(const Node& node) {
    521           snapshot.eraseNode(node);
    522         }
    523         virtual void erase(const std::vector<Node>& nodes) {
    524           for (int i = 0; i < int(nodes.size()); ++i) {
    525             snapshot.eraseNode(nodes[i]);
    526           }
    527         }
    528         virtual void build() {
    529           Node node;
    530           std::vector<Node> nodes;
    531           for (notifier()->first(node); node != INVALID;
    532                notifier()->next(node)) {
    533             nodes.push_back(node);
    534           }
    535           for (int i = nodes.size() - 1; i >= 0; --i) {
    536             snapshot.addNode(nodes[i]);
    537           }
    538         }
    539         virtual void clear() {
    540           Node node;
    541           for (notifier()->first(node); node != INVALID;
    542                notifier()->next(node)) {
    543             snapshot.eraseNode(node);
    544           }
    545         }
    546 
    547         Snapshot& snapshot;
    548       };
    549 
    550       class ArcObserverProxy : public ArcNotifier::ObserverBase {
    551       public:
    552 
    553         ArcObserverProxy(Snapshot& _snapshot)
    554           : snapshot(_snapshot) {}
    555 
    556         using ArcNotifier::ObserverBase::attach;
    557         using ArcNotifier::ObserverBase::detach;
    558         using ArcNotifier::ObserverBase::attached;
    559        
    560       protected:
    561 
    562         virtual void add(const Arc& arc) {
    563           snapshot.addArc(arc);
    564         }
    565         virtual void add(const std::vector<Arc>& arcs) {
    566           for (int i = arcs.size() - 1; i >= 0; ++i) {
    567             snapshot.addArc(arcs[i]);
    568           }
    569         }
    570         virtual void erase(const Arc& arc) {
    571           snapshot.eraseArc(arc);
    572         }
    573         virtual void erase(const std::vector<Arc>& arcs) {
    574           for (int i = 0; i < int(arcs.size()); ++i) {
    575             snapshot.eraseArc(arcs[i]);
    576           }
    577         }
    578         virtual void build() {
    579           Arc arc;
    580           std::vector<Arc> arcs;
    581           for (notifier()->first(arc); arc != INVALID;
    582                notifier()->next(arc)) {
    583             arcs.push_back(arc);
    584           }
    585           for (int i = arcs.size() - 1; i >= 0; --i) {
    586             snapshot.addArc(arcs[i]);
    587           }
    588         }
    589         virtual void clear() {
    590           Arc arc;
    591           for (notifier()->first(arc); arc != INVALID;
    592                notifier()->next(arc)) {
    593             snapshot.eraseArc(arc);
    594           }
    595         }
    596 
    597         Snapshot& snapshot;
    598       };
    599      
    600       ListDigraph *digraph;
    601 
    602       NodeObserverProxy node_observer_proxy;
    603       ArcObserverProxy arc_observer_proxy;
    604 
    605       std::list<Node> added_nodes;
    606       std::list<Arc> added_arcs;
    607 
    608 
    609       void addNode(const Node& node) {
    610         added_nodes.push_front(node);       
    611       }
    612       void eraseNode(const Node& node) {
    613         std::list<Node>::iterator it =
    614           std::find(added_nodes.begin(), added_nodes.end(), node);
    615         if (it == added_nodes.end()) {
    616           clear();
    617           arc_observer_proxy.detach();
    618           throw NodeNotifier::ImmediateDetach();
    619         } else {
    620           added_nodes.erase(it);
    621         }
    622       }
    623 
    624       void addArc(const Arc& arc) {
    625         added_arcs.push_front(arc);       
    626       }
    627       void eraseArc(const Arc& arc) {
    628         std::list<Arc>::iterator it =
    629           std::find(added_arcs.begin(), added_arcs.end(), arc);
    630         if (it == added_arcs.end()) {
    631           clear();
    632           node_observer_proxy.detach();
    633           throw ArcNotifier::ImmediateDetach();
    634         } else {
    635           added_arcs.erase(it);
    636         }       
    637       }
    638 
    639       void attach(ListDigraph &_digraph) {
    640         digraph = &_digraph;
    641         node_observer_proxy.attach(digraph->notifier(Node()));
    642         arc_observer_proxy.attach(digraph->notifier(Arc()));
    643       }
    644            
    645       void detach() {
    646         node_observer_proxy.detach();
    647         arc_observer_proxy.detach();
    648       }
    649 
    650       bool attached() const {
    651         return node_observer_proxy.attached();
    652       }
    653 
    654       void clear() {
    655         added_nodes.clear();
    656         added_arcs.clear();       
    657       }
    658 
    659     public:
    660 
    661       /// \brief Default constructor.
    662       ///
    663       /// Default constructor.
    664       /// To actually make a snapshot you must call save().
    665       Snapshot()
    666         : digraph(0), node_observer_proxy(*this),
    667           arc_observer_proxy(*this) {}
    668      
    669       /// \brief Constructor that immediately makes a snapshot.
    670       ///     
    671       /// This constructor immediately makes a snapshot of the digraph.
    672       /// \param _digraph The digraph we make a snapshot of.
    673       Snapshot(ListDigraph &_digraph)
    674         : node_observer_proxy(*this),
    675           arc_observer_proxy(*this) {
    676         attach(_digraph);
    677       }
    678      
    679       /// \brief Make a snapshot.
    680       ///
    681       /// Make a snapshot of the digraph.
    682       ///
    683       /// This function can be called more than once. In case of a repeated
    684       /// call, the previous snapshot gets lost.
    685       /// \param _digraph The digraph we make the snapshot of.
    686       void save(ListDigraph &_digraph) {
    687         if (attached()) {
    688           detach();
    689           clear();
    690         }
    691         attach(_digraph);
    692       }
    693      
    694       /// \brief Undo the changes until the last snapshot.
    695       //
    696       /// Undo the changes until the last snapshot created by save().
    697       void restore() {
    698         detach();
    699         for(std::list<Arc>::iterator it = added_arcs.begin();
    700             it != added_arcs.end(); ++it) {
    701           digraph->erase(*it);
    702         }
    703         for(std::list<Node>::iterator it = added_nodes.begin();
    704             it != added_nodes.end(); ++it) {
    705           digraph->erase(*it);
    706         }
    707         clear();
    708       }
    709 
    710       /// \brief Gives back true when the snapshot is valid.
    711       ///
    712       /// Gives back true when the snapshot is valid.
    713       bool valid() const {
    714         return attached();
    715       }
    716     };
    717    
    718   };
    719 
    720   ///@}
    721 
    722   class ListGraphBase {
    723 
    724   protected:
    725 
    726     struct NodeT {
    727       int first_out;
    728       int prev, next;
    729     };
    730  
    731     struct ArcT {
    732       int target;
    733       int prev_out, next_out;
    734     };
    735 
    736     std::vector<NodeT> nodes;
    737 
    738     int first_node;
    739 
    740     int first_free_node;
    741 
    742     std::vector<ArcT> arcs;
    743 
    744     int first_free_arc;
    745    
    746   public:
    747    
    748     typedef ListGraphBase Digraph;
    749 
    750     class Node;
    751     class Arc;
    752     class Edge;
    753    
    754     class Node {
    755       friend class ListGraphBase;
    756     protected:
    757 
    758       int id;
    759       explicit Node(int pid) { id = pid;}
    760 
    761     public:
    762       Node() {}
    763       Node (Invalid) { id = -1; }
    764       bool operator==(const Node& node) const {return id == node.id;}
    765       bool operator!=(const Node& node) const {return id != node.id;}
    766       bool operator<(const Node& node) const {return id < node.id;}
    767     };
    768 
    769     class Edge {
    770       friend class ListGraphBase;
    771     protected:
    772 
    773       int id;
    774       explicit Edge(int pid) { id = pid;}
    775 
    776     public:
    777       Edge() {}
    778       Edge (Invalid) { id = -1; }
    779       bool operator==(const Edge& arc) const {return id == arc.id;}
    780       bool operator!=(const Edge& arc) const {return id != arc.id;}
    781       bool operator<(const Edge& arc) const {return id < arc.id;}
    782     };
    783 
    784     class Arc {
    785       friend class ListGraphBase;
    786     protected:
    787 
    788       int id;
    789       explicit Arc(int pid) { id = pid;}
    790 
    791     public:
    792       operator Edge() const { return edgeFromId(id / 2); }
    793 
    794       Arc() {}
    795       Arc (Invalid) { id = -1; }
    796       bool operator==(const Arc& arc) const {return id == arc.id;}
    797       bool operator!=(const Arc& arc) const {return id != arc.id;}
    798       bool operator<(const Arc& arc) const {return id < arc.id;}
    799     };
    800 
    801 
    802 
    803     ListGraphBase()
    804       : nodes(), first_node(-1),
    805         first_free_node(-1), arcs(), first_free_arc(-1) {}
    806 
    807    
    808     int maxNodeId() const { return nodes.size()-1; }
    809     int maxEdgeId() const { return arcs.size() / 2 - 1; }
    810     int maxArcId() const { return arcs.size()-1; }
    811 
    812     Node source(Arc e) const { return Node(arcs[e.id ^ 1].target); }
    813     Node target(Arc e) const { return Node(arcs[e.id].target); }
    814 
    815     Node u(Edge e) const { return Node(arcs[2 * e.id].target); }
    816     Node v(Edge e) const { return Node(arcs[2 * e.id + 1].target); }
    817 
    818     static bool direction(Arc e) {
    819       return (e.id & 1) == 1;
    820     }
    821 
    822     static Arc direct(Edge e, bool d) {
    823       return Arc(e.id * 2 + (d ? 1 : 0));
    824     }
    825 
    826     void first(Node& node) const {
    827       node.id = first_node;
    828     }
    829 
    830     void next(Node& node) const {
    831       node.id = nodes[node.id].next;
    832     }
    833 
    834     void first(Arc& e) const {
    835       int n = first_node;
    836       while (n != -1 && nodes[n].first_out == -1) {
    837         n = nodes[n].next;
    838       }
    839       e.id = (n == -1) ? -1 : nodes[n].first_out;
    840     }
    841 
    842     void next(Arc& e) const {
    843       if (arcs[e.id].next_out != -1) {
    844         e.id = arcs[e.id].next_out;
    845       } else {
    846         int n = nodes[arcs[e.id ^ 1].target].next;
    847         while(n != -1 && nodes[n].first_out == -1) {
    848           n = nodes[n].next;
    849         }
    850         e.id = (n == -1) ? -1 : nodes[n].first_out;
    851       }     
    852     }
    853 
    854     void first(Edge& e) const {
    855       int n = first_node;
    856       while (n != -1) {
    857         e.id = nodes[n].first_out;
    858         while ((e.id & 1) != 1) {
    859           e.id = arcs[e.id].next_out;
    860         }
    861         if (e.id != -1) {
    862           e.id /= 2;
    863           return;
    864         }
    865         n = nodes[n].next;
    866       }
    867       e.id = -1;
    868     }
    869 
    870     void next(Edge& e) const {
    871       int n = arcs[e.id * 2].target;
    872       e.id = arcs[(e.id * 2) | 1].next_out;
    873       while ((e.id & 1) != 1) {
    874         e.id = arcs[e.id].next_out;
    875       }
    876       if (e.id != -1) {
    877         e.id /= 2;
    878         return;
    879       }
    880       n = nodes[n].next;
    881       while (n != -1) {
    882         e.id = nodes[n].first_out;
    883         while ((e.id & 1) != 1) {
    884           e.id = arcs[e.id].next_out;
    885         }
    886         if (e.id != -1) {
    887           e.id /= 2;
    888           return;
    889         }
    890         n = nodes[n].next;
    891       }
    892       e.id = -1;
    893     }
    894 
    895     void firstOut(Arc &e, const Node& v) const {
    896       e.id = nodes[v.id].first_out;
    897     }
    898     void nextOut(Arc &e) const {
    899       e.id = arcs[e.id].next_out;
    900     }
    901 
    902     void firstIn(Arc &e, const Node& v) const {
    903       e.id = ((nodes[v.id].first_out) ^ 1);
    904       if (e.id == -2) e.id = -1;
    905     }
    906     void nextIn(Arc &e) const {
    907       e.id = ((arcs[e.id ^ 1].next_out) ^ 1);
    908       if (e.id == -2) e.id = -1;
    909     }
    910 
    911     void firstInc(Edge &e, bool& d, const Node& v) const {
    912       int de = nodes[v.id].first_out;
    913       if (de != -1 ) {
    914         e.id = de / 2;
    915         d = ((de & 1) == 1);
    916       } else {
    917         e.id = -1;
    918         d = true;
    919       }
    920     }
    921     void nextInc(Edge &e, bool& d) const {
    922       int de = (arcs[(e.id * 2) | (d ? 1 : 0)].next_out);
    923       if (de != -1 ) {
    924         e.id = de / 2;
    925         d = ((de & 1) == 1);
    926       } else {
    927         e.id = -1;
    928         d = true;
    929       }
    930     }
    931    
    932     static int id(Node v) { return v.id; }
    933     static int id(Arc e) { return e.id; }
    934     static int id(Edge e) { return e.id; }
    935 
    936     static Node nodeFromId(int id) { return Node(id);}
    937     static Arc arcFromId(int id) { return Arc(id);}
    938     static Edge edgeFromId(int id) { return Edge(id);}
    939 
    940     Node addNode() {     
    941       int n;
    942      
    943       if(first_free_node==-1) {
    944         n = nodes.size();
    945         nodes.push_back(NodeT());
    946       } else {
    947         n = first_free_node;
    948         first_free_node = nodes[n].next;
    949       }
    950      
    951       nodes[n].next = first_node;
    952       if (first_node != -1) nodes[first_node].prev = n;
    953       first_node = n;
    954       nodes[n].prev = -1;
    955      
    956       nodes[n].first_out = -1;
    957      
    958       return Node(n);
    959     }
    960    
    961     Edge addEdge(Node u, Node v) {
    962       int n;     
    963 
    964       if (first_free_arc == -1) {
    965         n = arcs.size();
    966         arcs.push_back(ArcT());
    967         arcs.push_back(ArcT());
    968       } else {
    969         n = first_free_arc;
    970         first_free_arc = arcs[n].next_out;
    971       }
    972      
    973       arcs[n].target = u.id;
    974       arcs[n | 1].target = v.id;
    975 
    976       arcs[n].next_out = nodes[v.id].first_out;
    977       if (nodes[v.id].first_out != -1) {
    978         arcs[nodes[v.id].first_out].prev_out = n;
    979       }     
    980       arcs[n].prev_out = -1;
    981       nodes[v.id].first_out = n;
    982      
    983       arcs[n | 1].next_out = nodes[u.id].first_out;
    984       if (nodes[u.id].first_out != -1) {
    985         arcs[nodes[u.id].first_out].prev_out = (n | 1);
    986       }
    987       arcs[n | 1].prev_out = -1;     
    988       nodes[u.id].first_out = (n | 1);
    989 
    990       return Edge(n / 2);
    991     }
    992    
    993     void erase(const Node& node) {
    994       int n = node.id;
    995      
    996       if(nodes[n].next != -1) {
    997         nodes[nodes[n].next].prev = nodes[n].prev;
    998       }
    999      
    1000       if(nodes[n].prev != -1) {
    1001         nodes[nodes[n].prev].next = nodes[n].next;
    1002       } else {
    1003         first_node = nodes[n].next;
    1004       }
    1005      
    1006       nodes[n].next = first_free_node;
    1007       first_free_node = n;
    1008 
    1009     }
    1010    
    1011     void erase(const Edge& arc) {
    1012       int n = arc.id * 2;
    1013      
    1014       if (arcs[n].next_out != -1) {
    1015         arcs[arcs[n].next_out].prev_out = arcs[n].prev_out;
    1016       }
    1017 
    1018       if (arcs[n].prev_out != -1) {
    1019         arcs[arcs[n].prev_out].next_out = arcs[n].next_out;
    1020       } else {
    1021         nodes[arcs[n | 1].target].first_out = arcs[n].next_out;
    1022       }
    1023 
    1024       if (arcs[n | 1].next_out != -1) {
    1025         arcs[arcs[n | 1].next_out].prev_out = arcs[n | 1].prev_out;
    1026       }
    1027 
    1028       if (arcs[n | 1].prev_out != -1) {
    1029         arcs[arcs[n | 1].prev_out].next_out = arcs[n | 1].next_out;
    1030       } else {
    1031         nodes[arcs[n].target].first_out = arcs[n | 1].next_out;
    1032       }
    1033      
    1034       arcs[n].next_out = first_free_arc;
    1035       first_free_arc = n;     
    1036 
    1037     }
    1038 
    1039     void clear() {
    1040       arcs.clear();
    1041       nodes.clear();
    1042       first_node = first_free_node = first_free_arc = -1;
    1043     }
    1044 
    1045   protected:
    1046 
    1047     void changeTarget(Edge e, Node n) {
    1048       if(arcs[2 * e.id].next_out != -1) {
    1049         arcs[arcs[2 * e.id].next_out].prev_out = arcs[2 * e.id].prev_out;
    1050       }
    1051       if(arcs[2 * e.id].prev_out != -1) {
    1052         arcs[arcs[2 * e.id].prev_out].next_out =
    1053           arcs[2 * e.id].next_out;
    1054       } else {
    1055         nodes[arcs[(2 * e.id) | 1].target].first_out =
    1056           arcs[2 * e.id].next_out;
    1057       }
    1058 
    1059       if (nodes[n.id].first_out != -1) {
    1060         arcs[nodes[n.id].first_out].prev_out = 2 * e.id;
    1061       }
    1062       arcs[(2 * e.id) | 1].target = n.id;
    1063       arcs[2 * e.id].prev_out = -1;
    1064       arcs[2 * e.id].next_out = nodes[n.id].first_out;
    1065       nodes[n.id].first_out = 2 * e.id;
    1066     }
    1067 
    1068     void changeSource(Edge e, Node n) {
    1069       if(arcs[(2 * e.id) | 1].next_out != -1) {
    1070         arcs[arcs[(2 * e.id) | 1].next_out].prev_out =
    1071           arcs[(2 * e.id) | 1].prev_out;
    1072       }
    1073       if(arcs[(2 * e.id) | 1].prev_out != -1) {
    1074         arcs[arcs[(2 * e.id) | 1].prev_out].next_out =
    1075           arcs[(2 * e.id) | 1].next_out;
    1076       } else {
    1077         nodes[arcs[2 * e.id].target].first_out =
    1078           arcs[(2 * e.id) | 1].next_out;
    1079       }
    1080 
    1081       if (nodes[n.id].first_out != -1) {
    1082         arcs[nodes[n.id].first_out].prev_out = ((2 * e.id) | 1);
    1083       }
    1084       arcs[2 * e.id].target = n.id;
    1085       arcs[(2 * e.id) | 1].prev_out = -1;
    1086       arcs[(2 * e.id) | 1].next_out = nodes[n.id].first_out;
    1087       nodes[n.id].first_out = ((2 * e.id) | 1);
    1088     }
    1089 
    1090   };
    1091 
    1092 //   typedef GraphExtender<UndirDigraphExtender<ListDigraphBase> >
    1093 //   ExtendedListGraphBase;
    1094 
    1095   typedef GraphExtender<ListGraphBase> ExtendedListGraphBase;
    1096 
    1097 
    1098 
    1099   /// \addtogroup digraphs
    1100   /// @{
    1101 
    1102   ///An undirected list digraph class.
    1103 
    1104   ///This is a simple and fast undirected digraph implementation.
    1105   ///
    1106   ///An important extra feature of this digraph implementation is that
    1107   ///its maps are real \ref concepts::ReferenceMap "reference map"s.
    1108   ///
    1109   ///It conforms to the
    1110   ///\ref concepts::Graph "Graph concept".
    1111   ///
    1112   ///\sa concepts::Graph.
    1113   ///
    1114   class ListGraph : public ExtendedListGraphBase {
    1115   private:
    1116     ///ListGraph is \e not copy constructible. Use GraphCopy() instead.
    1117 
    1118     ///ListGraph is \e not copy constructible. Use GraphCopy() instead.
    1119     ///
    1120     ListGraph(const ListGraph &) :ExtendedListGraphBase()  {};
    1121     ///\brief Assignment of ListGraph to another one is \e not allowed.
    1122     ///Use GraphCopy() instead.
    1123 
    1124     ///Assignment of ListGraph to another one is \e not allowed.
    1125     ///Use GraphCopy() instead.
    1126     void operator=(const ListGraph &) {}
    1127   public:
    1128     /// Constructor
    1129    
    1130     /// Constructor.
    1131     ///
    1132     ListGraph() {}
    1133 
    1134     typedef ExtendedListGraphBase Parent;
    1135 
    1136     typedef Parent::OutArcIt IncArcIt;
    1137 
    1138     /// \brief Add a new node to the digraph.
    1139     ///
    1140     /// \return the new node.
    1141     ///
    1142     Node addNode() { return Parent::addNode(); }
    1143 
    1144     /// \brief Add a new edge to the digraph.
    1145     ///
    1146     /// Add a new arc to the digraph with source node \c s
    1147     /// and target node \c t.
    1148     /// \return the new edge.
    1149     Edge addEdge(const Node& s, const Node& t) {
    1150       return Parent::addEdge(s, t);
    1151     }
    1152     /// \brief Changes the source of \c e to \c n
    1153     ///
    1154     /// Changes the source of \c e to \c n
    1155     ///
    1156     ///\note The <tt>ArcIt</tt>s and <tt>InArcIt</tt>s
    1157     ///referencing the changed arc remain
    1158     ///valid. However <tt>OutArcIt</tt>s are invalidated.
    1159     void changeSource(Edge e, Node n) {
    1160       Parent::changeSource(e,n);
    1161     }   
    1162     /// \brief Changes the target of \c e to \c n
    1163     ///
    1164     /// Changes the target of \c e to \c n
    1165     ///
    1166     /// \note The <tt>ArcIt</tt>s referencing the changed arc remain
    1167     /// valid. However the other iterators may be invalidated.
    1168     void changeTarget(Edge e, Node n) {
    1169       Parent::changeTarget(e,n);
    1170     }
    1171     /// \brief Changes the source of \c e to \c n
    1172     ///
    1173     /// Changes the source of \c e to \c n. It changes the proper
    1174     /// node of the represented edge.
    1175     ///
    1176     ///\note The <tt>ArcIt</tt>s and <tt>InArcIt</tt>s
    1177     ///referencing the changed arc remain
    1178     ///valid. However <tt>OutArcIt</tt>s are invalidated.
    1179     void changeSource(Arc e, Node n) {
    1180       if (Parent::direction(e)) {
    1181         Parent::changeSource(e,n);
    1182       } else {
    1183         Parent::changeTarget(e,n);
    1184       }
    1185     }
    1186     /// \brief Changes the target of \c e to \c n
    1187     ///
    1188     /// Changes the target of \c e to \c n. It changes the proper
    1189     /// node of the represented edge.
    1190     ///
    1191     ///\note The <tt>ArcIt</tt>s and <tt>OutArcIt</tt>s
    1192     ///referencing the changed arc remain
    1193     ///valid. However <tt>InArcIt</tt>s are invalidated.
    1194     void changeTarget(Arc e, Node n) {
    1195       if (Parent::direction(e)) {
    1196         Parent::changeTarget(e,n);
    1197       } else {
    1198         Parent::changeSource(e,n);
    1199       }
    1200     }
    1201     /// \brief Contract two nodes.
    1202     ///
    1203     /// This function contracts two nodes.
    1204     ///
    1205     /// Node \p b will be removed but instead of deleting
    1206     /// its neighboring arcs, they will be joined to \p a.
    1207     /// The last parameter \p r controls whether to remove loops. \c true
    1208     /// means that loops will be removed.
    1209     ///
    1210     /// \note The <tt>ArcIt</tt>s referencing a moved arc remain
    1211     /// valid.
    1212     void contract(Node a, Node b, bool r = true) {
    1213       for(IncArcIt e(*this, b); e!=INVALID;) {
    1214         IncArcIt f = e; ++f;
    1215         if (r && runningNode(e) == a) {
    1216           erase(e);
    1217         } else if (source(e) == b) {
    1218           changeSource(e, a);
    1219         } else {
    1220           changeTarget(e, a);
    1221         }
    1222         e = f;
    1223       }
    1224       erase(b);
    1225     }
    1226 
    1227 
    1228     /// \brief Class to make a snapshot of the digraph and restore
    1229     /// to it later.
    1230     ///
    1231     /// Class to make a snapshot of the digraph and to restore it
    1232     /// later.
    1233     ///
    1234     /// The newly added nodes and edges can be removed
    1235     /// using the restore() function.
    1236     ///
    1237     /// \warning Arc and node deletions cannot be restored. This
    1238     /// events invalidate the snapshot.
    1239     class Snapshot {
    1240     protected:
    1241 
    1242       typedef Parent::NodeNotifier NodeNotifier;
    1243 
    1244       class NodeObserverProxy : public NodeNotifier::ObserverBase {
    1245       public:
    1246 
    1247         NodeObserverProxy(Snapshot& _snapshot)
    1248           : snapshot(_snapshot) {}
    1249 
    1250         using NodeNotifier::ObserverBase::attach;
    1251         using NodeNotifier::ObserverBase::detach;
    1252         using NodeNotifier::ObserverBase::attached;
    1253        
    1254       protected:
    1255        
    1256         virtual void add(const Node& node) {
    1257           snapshot.addNode(node);
    1258         }
    1259         virtual void add(const std::vector<Node>& nodes) {
    1260           for (int i = nodes.size() - 1; i >= 0; ++i) {
    1261             snapshot.addNode(nodes[i]);
    1262           }
    1263         }
    1264         virtual void erase(const Node& node) {
    1265           snapshot.eraseNode(node);
    1266         }
    1267         virtual void erase(const std::vector<Node>& nodes) {
    1268           for (int i = 0; i < int(nodes.size()); ++i) {
    1269             snapshot.eraseNode(nodes[i]);
    1270           }
    1271         }
    1272         virtual void build() {
    1273           Node node;
    1274           std::vector<Node> nodes;
    1275           for (notifier()->first(node); node != INVALID;
    1276                notifier()->next(node)) {
    1277             nodes.push_back(node);
    1278           }
    1279           for (int i = nodes.size() - 1; i >= 0; --i) {
    1280             snapshot.addNode(nodes[i]);
    1281           }
    1282         }
    1283         virtual void clear() {
    1284           Node node;
    1285           for (notifier()->first(node); node != INVALID;
    1286                notifier()->next(node)) {
    1287             snapshot.eraseNode(node);
    1288           }
    1289         }
    1290 
    1291         Snapshot& snapshot;
    1292       };
    1293 
    1294       class EdgeObserverProxy : public EdgeNotifier::ObserverBase {
    1295       public:
    1296 
    1297         EdgeObserverProxy(Snapshot& _snapshot)
    1298           : snapshot(_snapshot) {}
    1299 
    1300         using EdgeNotifier::ObserverBase::attach;
    1301         using EdgeNotifier::ObserverBase::detach;
    1302         using EdgeNotifier::ObserverBase::attached;
    1303        
    1304       protected:
    1305 
    1306         virtual void add(const Edge& arc) {
    1307           snapshot.addEdge(arc);
    1308         }
    1309         virtual void add(const std::vector<Edge>& arcs) {
    1310           for (int i = arcs.size() - 1; i >= 0; ++i) {
    1311             snapshot.addEdge(arcs[i]);
    1312           }
    1313         }
    1314         virtual void erase(const Edge& arc) {
    1315           snapshot.eraseEdge(arc);
    1316         }
    1317         virtual void erase(const std::vector<Edge>& arcs) {
    1318           for (int i = 0; i < int(arcs.size()); ++i) {
    1319             snapshot.eraseEdge(arcs[i]);
    1320           }
    1321         }
    1322         virtual void build() {
    1323           Edge arc;
    1324           std::vector<Edge> arcs;
    1325           for (notifier()->first(arc); arc != INVALID;
    1326                notifier()->next(arc)) {
    1327             arcs.push_back(arc);
    1328           }
    1329           for (int i = arcs.size() - 1; i >= 0; --i) {
    1330             snapshot.addEdge(arcs[i]);
    1331           }
    1332         }
    1333         virtual void clear() {
    1334           Edge arc;
    1335           for (notifier()->first(arc); arc != INVALID;
    1336                notifier()->next(arc)) {
    1337             snapshot.eraseEdge(arc);
    1338           }
    1339         }
    1340 
    1341         Snapshot& snapshot;
    1342       };
    1343      
    1344       ListGraph *digraph;
    1345 
    1346       NodeObserverProxy node_observer_proxy;
    1347       EdgeObserverProxy arc_observer_proxy;
    1348 
    1349       std::list<Node> added_nodes;
    1350       std::list<Edge> added_arcs;
    1351 
    1352 
    1353       void addNode(const Node& node) {
    1354         added_nodes.push_front(node);       
    1355       }
    1356       void eraseNode(const Node& node) {
    1357         std::list<Node>::iterator it =
    1358           std::find(added_nodes.begin(), added_nodes.end(), node);
    1359         if (it == added_nodes.end()) {
    1360           clear();
    1361           arc_observer_proxy.detach();
    1362           throw NodeNotifier::ImmediateDetach();
    1363         } else {
    1364           added_nodes.erase(it);
    1365         }
    1366       }
    1367 
    1368       void addEdge(const Edge& arc) {
    1369         added_arcs.push_front(arc);       
    1370       }
    1371       void eraseEdge(const Edge& arc) {
    1372         std::list<Edge>::iterator it =
    1373           std::find(added_arcs.begin(), added_arcs.end(), arc);
    1374         if (it == added_arcs.end()) {
    1375           clear();
    1376           node_observer_proxy.detach();
    1377           throw EdgeNotifier::ImmediateDetach();
    1378         } else {
    1379           added_arcs.erase(it);
    1380         }       
    1381       }
    1382 
    1383       void attach(ListGraph &_digraph) {
    1384         digraph = &_digraph;
    1385         node_observer_proxy.attach(digraph->notifier(Node()));
    1386         arc_observer_proxy.attach(digraph->notifier(Edge()));
    1387       }
    1388            
    1389       void detach() {
    1390         node_observer_proxy.detach();
    1391         arc_observer_proxy.detach();
    1392       }
    1393 
    1394       bool attached() const {
    1395         return node_observer_proxy.attached();
    1396       }
    1397 
    1398       void clear() {
    1399         added_nodes.clear();
    1400         added_arcs.clear();       
    1401       }
    1402 
    1403     public:
    1404 
    1405       /// \brief Default constructor.
    1406       ///
    1407       /// Default constructor.
    1408       /// To actually make a snapshot you must call save().
    1409       Snapshot()
    1410         : digraph(0), node_observer_proxy(*this),
    1411           arc_observer_proxy(*this) {}
    1412      
    1413       /// \brief Constructor that immediately makes a snapshot.
    1414       ///     
    1415       /// This constructor immediately makes a snapshot of the digraph.
    1416       /// \param _digraph The digraph we make a snapshot of.
    1417       Snapshot(ListGraph &_digraph)
    1418         : node_observer_proxy(*this),
    1419           arc_observer_proxy(*this) {
    1420         attach(_digraph);
    1421       }
    1422      
    1423       /// \brief Make a snapshot.
    1424       ///
    1425       /// Make a snapshot of the digraph.
    1426       ///
    1427       /// This function can be called more than once. In case of a repeated
    1428       /// call, the previous snapshot gets lost.
    1429       /// \param _digraph The digraph we make the snapshot of.
    1430       void save(ListGraph &_digraph) {
    1431         if (attached()) {
    1432           detach();
    1433           clear();
    1434         }
    1435         attach(_digraph);
    1436       }
    1437      
    1438       /// \brief Undo the changes until the last snapshot.
    1439       //
    1440       /// Undo the changes until the last snapshot created by save().
    1441       void restore() {
    1442         detach();
    1443         for(std::list<Edge>::iterator it = added_arcs.begin();
    1444             it != added_arcs.end(); ++it) {
    1445           digraph->erase(*it);
    1446         }
    1447         for(std::list<Node>::iterator it = added_nodes.begin();
    1448             it != added_nodes.end(); ++it) {
    1449           digraph->erase(*it);
    1450         }
    1451         clear();
    1452       }
    1453 
    1454       /// \brief Gives back true when the snapshot is valid.
    1455       ///
    1456       /// Gives back true when the snapshot is valid.
    1457       bool valid() const {
    1458         return attached();
    1459       }
    1460     };
    1461   };
    1462  
    1463   /// @} 
    1464 } //namespace lemon
    1465  
    1466 
    1467 #endif

  • test/Makefile.am

    r58 r32  
    33
    44noinst_HEADERS += \
    5         test/digraph_test.h \
    6         test/map_test.h \
    75        test/test_tools.h
    86
    97check_PROGRAMS += \
    10         test/digraph_test \
    118        test/dim_test \
    12         test/graph_test \
    139        test/random_test \
    1410        test/test_tools_fail \
    … …  
    1814XFAIL_TESTS += test/test_tools_fail$(EXEEXT)
    1915
    20 test_digraph_test_SOURCES = test/digraph_test.cc
    2116test_dim_test_SOURCES = test/dim_test.cc
    22 test_graph_test_SOURCES = test/graph_test.cc
    2317test_random_test_SOURCES = test/random_test.cc
    2418test_test_tools_fail_SOURCES = test/test_tools_fail.cc
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