[9] | 1 | #ifndef MARCI_LIST_GRAPH_HH |
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| 2 | #define MARCI_LIST_GRAPH_HH |
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| 3 | |
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| 4 | #include <iostream> |
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| 5 | |
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| 6 | namespace marci { |
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| 7 | |
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| 8 | class list_graph { |
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| 9 | class node_item; |
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| 10 | class edge_item; |
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| 11 | public: |
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| 12 | class node_iterator; |
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| 13 | class each_node_iterator; |
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| 14 | class edge_iterator; |
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| 15 | class each_edge_iterator; |
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| 16 | class out_edge_iterator; |
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| 17 | class in_edge_iterator; |
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| 18 | class sym_edge_iterator; |
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| 19 | private: |
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| 20 | int node_id; |
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| 21 | int edge_id; |
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| 22 | |
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| 23 | node_item* _first_node; |
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| 24 | node_item* _last_node; |
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| 25 | |
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| 26 | class node_item { |
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| 27 | friend class list_graph; |
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| 28 | friend class node_iterator; |
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| 29 | friend class each_node_iterator; |
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| 30 | friend class edge_iterator; |
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| 31 | friend class each_edge_iterator; |
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| 32 | friend class out_edge_iterator; |
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| 33 | friend class in_edge_iterator; |
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| 34 | friend class sym_edge_iterator; |
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| 35 | friend std::ostream& operator<<(std::ostream& os, const node_iterator& i); |
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| 36 | friend std::ostream& operator<<(std::ostream& os, const edge_iterator& i); |
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| 37 | list_graph* G; |
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| 38 | int id; |
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| 39 | edge_item* _first_out_edge; |
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| 40 | edge_item* _last_out_edge; |
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| 41 | edge_item* _first_in_edge; |
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| 42 | edge_item* _last_in_edge; |
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| 43 | node_item* _next_node; |
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| 44 | node_item* _prev_node; |
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| 45 | public: |
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| 46 | node_item() { } |
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| 47 | }; |
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| 48 | |
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| 49 | class edge_item { |
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| 50 | friend class list_graph; |
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| 51 | friend class node_iterator; |
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| 52 | friend class each_node_iterator; |
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| 53 | friend class edge_iterator; |
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| 54 | friend class each_edge_iterator; |
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| 55 | friend class out_edge_iterator; |
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| 56 | friend class in_edge_iterator; |
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| 57 | friend class sym_edge_iterator; |
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| 58 | friend std::ostream& operator<<(std::ostream& os, const edge_iterator& i); |
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| 59 | list_graph* G; |
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| 60 | int id; |
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| 61 | node_item* _tail; |
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| 62 | node_item* _head; |
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| 63 | edge_item* _next_out; |
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| 64 | edge_item* _prev_out; |
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| 65 | edge_item* _next_in; |
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| 66 | edge_item* _prev_in; |
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| 67 | public: |
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| 68 | edge_item() { } |
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| 69 | }; |
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| 70 | |
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| 71 | node_item* _add_node() { |
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| 72 | node_item* p=new node_item; |
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| 73 | p->id=node_id++; |
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| 74 | p->_first_out_edge=0; |
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| 75 | p->_last_out_edge=0; |
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| 76 | p->_first_in_edge=0; |
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| 77 | p->_last_in_edge=0; |
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| 78 | p->_prev_node=_last_node; |
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| 79 | p->_next_node=0; |
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| 80 | if (_last_node) _last_node->_next_node=p; |
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| 81 | _last_node=p; |
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| 82 | if (!_first_node) _first_node=p; |
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| 83 | return p; |
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| 84 | } |
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| 85 | |
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| 86 | edge_item* _add_edge(node_item* _tail, node_item* _head) { |
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| 87 | edge_item* e=new edge_item; |
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| 88 | e->id=edge_id++; |
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| 89 | e->_tail=_tail; |
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| 90 | e->_head=_head; |
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| 91 | |
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| 92 | e->_prev_out=_tail->_last_out_edge; |
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| 93 | if (_tail->_last_out_edge) (_tail->_last_out_edge)->_next_out=e; |
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| 94 | _tail->_last_out_edge=e; |
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| 95 | if (!_tail->_first_out_edge) _tail->_first_out_edge=e; |
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| 96 | |
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| 97 | e->_prev_in=_head->_last_in_edge; |
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| 98 | if (_head->_last_in_edge) (_head->_last_in_edge)->_next_in=e; |
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| 99 | _head->_last_in_edge=e; |
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| 100 | if (!_head->_first_in_edge) { _head->_first_in_edge=e; } |
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| 101 | return e; |
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| 102 | } |
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| 103 | |
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| 104 | public: |
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| 105 | |
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| 106 | /* default constructor */ |
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| 107 | |
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| 108 | list_graph() : node_id(0), edge_id(0), _first_node(0), _last_node(0) { } |
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| 109 | |
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| 110 | /* functions to construct iterators from the graph, or from each other */ |
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| 111 | |
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| 112 | each_node_iterator first_node() { return each_node_iterator(_first_node); } |
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| 113 | each_edge_iterator first_edge() { |
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| 114 | node_item* v=_first_node; |
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| 115 | edge_item* edge=v->_first_out_edge; |
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| 116 | while (v && !edge) { v=v->_next_node; if (v) edge=v->_first_out_edge; } |
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| 117 | return each_edge_iterator(v, edge); |
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| 118 | } |
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| 119 | |
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| 120 | out_edge_iterator first_out_edge(const node_iterator& v) { |
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| 121 | return out_edge_iterator(v); |
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| 122 | } |
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| 123 | in_edge_iterator first_in_edge(const node_iterator& v) { |
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| 124 | return in_edge_iterator(v); |
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| 125 | } |
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| 126 | sym_edge_iterator first_sym_edge(const node_iterator& v) { |
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| 127 | return sym_edge_iterator(v); |
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| 128 | } |
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| 129 | node_iterator tail(const edge_iterator& e) { return e.tail_node(); } |
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| 130 | node_iterator head(const edge_iterator& e) { return e.head_node(); } |
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| 131 | |
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| 132 | node_iterator a_node(const out_edge_iterator& e) { return e.a_node(); } |
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| 133 | node_iterator a_node(const in_edge_iterator& e) { return e.a_node(); } |
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| 134 | node_iterator a_node(const sym_edge_iterator& e) { return e.a_node(); } |
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| 135 | |
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| 136 | node_iterator b_node(const out_edge_iterator& e) { return e.b_node(); } |
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| 137 | node_iterator b_node(const in_edge_iterator& e) { return e.b_node(); } |
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| 138 | node_iterator b_node(const sym_edge_iterator& e) { return e.b_node(); } |
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| 139 | |
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[16] | 140 | //node_iterator invalid_node() { return node_iterator(); } |
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| 141 | //edge_iterator invalid_edge() { return edge_iterator(); } |
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| 142 | //out_edge_iterator invalid_out_edge() { return out_edge_iterator(); } |
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| 143 | //in_edge_iterator invalid_in_edge() { return in_edge_iterator(); } |
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| 144 | //sym_edge_iterator invalid_sym_edge() { return sym_edge_iterator(); } |
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[9] | 145 | |
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| 146 | /* same methods in other style */ |
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| 147 | /* for experimental purpose */ |
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| 148 | |
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| 149 | void get_first(each_node_iterator& v) { v=each_node_iterator(_first_node); } |
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| 150 | void get_first(each_edge_iterator& e) { e=first_edge(); } |
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| 151 | void get_first(out_edge_iterator& e, const node_iterator& v) { |
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| 152 | e=out_edge_iterator(v); |
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| 153 | } |
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| 154 | void get_first(in_edge_iterator& e, const node_iterator& v) { |
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| 155 | e=in_edge_iterator(v); |
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| 156 | } |
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| 157 | void get_first(sym_edge_iterator& e, const node_iterator& v) { |
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| 158 | e=sym_edge_iterator(v); |
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| 159 | } |
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| 160 | void get_tail(node_iterator& n, const edge_iterator& e) { n=tail(e); } |
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| 161 | void get_head(node_iterator& n, const edge_iterator& e) { n=head(e); } |
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| 162 | |
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| 163 | void get_a_node(node_iterator& n, const out_edge_iterator& e) { n=e.a_node(); } |
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| 164 | void get_a_node(node_iterator& n, const in_edge_iterator& e) { n=e.a_node(); } |
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| 165 | void get_a_node(node_iterator& n, const sym_edge_iterator& e) { n=e.a_node(); } |
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| 166 | void get_b_node(node_iterator& n, const out_edge_iterator& e) { n=e.b_node(); } |
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| 167 | void get_b_node(node_iterator& n, const in_edge_iterator& e) { n=e.b_node(); } |
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| 168 | void get_b_node(node_iterator& n, const sym_edge_iterator& e) { n=e.b_node(); } |
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[16] | 169 | //void get_invalid(node_iterator& n) { n=node_iterator(); } |
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| 170 | //void get_invalid(edge_iterator& e) { e=edge_iterator(); } |
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| 171 | //void get_invalid(out_edge_iterator& e) { e=out_edge_iterator(); } |
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| 172 | //void get_invalid(in_edge_iterator& e) { e=in_edge_iterator(); } |
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| 173 | //void get_invalid(sym_edge_iterator& e) { e=sym_edge_iterator(); } |
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[9] | 174 | |
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| 175 | |
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| 176 | /* for getting id's of graph objects */ |
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| 177 | /* these are important for the implementation of property vectors */ |
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| 178 | |
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| 179 | int id(const node_iterator& v) { return v.node->id; } |
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| 180 | int id(const edge_iterator& e) { return e.edge->id; } |
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| 181 | |
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| 182 | /* adding nodes and edges */ |
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| 183 | |
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| 184 | node_iterator add_node() { return node_iterator(_add_node()); } |
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| 185 | edge_iterator add_edge(const node_iterator& u, const node_iterator& v) { |
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| 186 | return edge_iterator(_add_edge(u.node, v.node)); |
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| 187 | } |
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| 188 | |
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| 189 | /* stream operations, for testing purpose */ |
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| 190 | |
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| 191 | friend std::ostream& operator<<(std::ostream& os, const node_iterator& i) { |
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| 192 | os << i.node->id; return os; |
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| 193 | } |
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| 194 | friend std::ostream& operator<<(std::ostream& os, const edge_iterator& i) { |
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| 195 | os << "(" << i.edge->_tail->id << "--" << i.edge->id << "->" << i.edge->_head->id << ")"; |
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| 196 | return os; |
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| 197 | } |
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| 198 | |
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| 199 | class node_iterator { |
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| 200 | friend class list_graph; |
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| 201 | |
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| 202 | friend class edge_iterator; |
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| 203 | friend class out_edge_iterator; |
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| 204 | friend class in_edge_iterator; |
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| 205 | friend class sym_edge_iterator; |
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| 206 | protected: |
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| 207 | node_item* node; |
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| 208 | friend int list_graph::id(const node_iterator& v); |
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| 209 | public: |
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| 210 | node_iterator() : node(0) { } |
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| 211 | node_iterator(node_item* _node) : node(_node) { } |
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| 212 | bool is_valid() { return (node!=0); } |
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[16] | 213 | void make_invalid() { node=0; } |
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[9] | 214 | friend bool operator==(const node_iterator& u, const node_iterator& v) { |
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| 215 | return v.node==u.node; |
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| 216 | } |
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| 217 | friend bool operator!=(const node_iterator& u, const node_iterator& v) { |
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| 218 | return v.node!=u.node; |
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| 219 | } |
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| 220 | friend std::ostream& operator<<(std::ostream& os, const node_iterator& i); |
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| 221 | }; |
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| 222 | |
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| 223 | class each_node_iterator : public node_iterator { |
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| 224 | friend class list_graph; |
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| 225 | public: |
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| 226 | each_node_iterator() : node_iterator() { } |
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| 227 | each_node_iterator(node_item* v) : node_iterator(v) { } |
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| 228 | each_node_iterator& operator++() { node=node->_next_node; return *this; } |
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| 229 | }; |
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| 230 | |
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| 231 | class edge_iterator { |
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| 232 | friend class list_graph; |
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| 233 | |
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| 234 | friend class node_iterator; |
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| 235 | friend class each_node_iterator; |
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| 236 | protected: |
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| 237 | edge_item* edge; |
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| 238 | friend int list_graph::id(const edge_iterator& e); |
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| 239 | public: |
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| 240 | edge_iterator() : edge(0) { } |
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| 241 | edge_iterator(edge_item* _edge) : edge(_edge) { } |
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| 242 | bool is_valid() { return (edge!=0); } |
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[16] | 243 | void make_invalid() { edge=0; } |
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[9] | 244 | friend bool operator==(const edge_iterator& u, const edge_iterator& v) { |
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| 245 | return v.edge==u.edge; |
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| 246 | } |
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| 247 | friend bool operator!=(const edge_iterator& u, const edge_iterator& v) { |
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| 248 | return v.edge!=u.edge; |
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| 249 | } |
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| 250 | protected: |
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| 251 | node_iterator tail_node() const { return node_iterator(edge->_tail); } |
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| 252 | node_iterator head_node() const { return node_iterator(edge->_head); } |
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| 253 | public: |
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| 254 | friend std::ostream& operator<<(std::ostream& os, const edge_iterator& i); |
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| 255 | }; |
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| 256 | |
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| 257 | class each_edge_iterator : public edge_iterator { |
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| 258 | friend class list_graph; |
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| 259 | node_item* v; |
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| 260 | public: |
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| 261 | each_edge_iterator() : edge_iterator(), v(0) { } |
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| 262 | each_edge_iterator(node_item* _v, edge_item* _e) : edge_iterator(_e), v(_v) { } |
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| 263 | each_edge_iterator& operator++() { |
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| 264 | edge=edge->_next_out; |
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| 265 | while (v && !edge) { v=v->_next_node; if (v) edge=v->_first_out_edge; } |
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| 266 | return *this; |
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| 267 | } |
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| 268 | }; |
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| 269 | |
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| 270 | class out_edge_iterator : public edge_iterator { |
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| 271 | friend class list_graph; |
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| 272 | node_item* v; |
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| 273 | public: |
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| 274 | out_edge_iterator() : edge_iterator(), v(0) { } |
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| 275 | protected: |
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| 276 | out_edge_iterator(const node_iterator& _v) : v(_v.node) { edge=v->_first_out_edge; } |
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| 277 | public: |
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| 278 | out_edge_iterator& operator++() { edge=edge->_next_out; return *this; } |
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| 279 | protected: |
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| 280 | node_iterator a_node() const { return node_iterator(v); } |
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| 281 | node_iterator b_node() const { |
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[13] | 282 | return (edge->_tail==v) ? node_iterator(edge->_head) : node_iterator(edge->_tail); } |
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[9] | 283 | }; |
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| 284 | |
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| 285 | class in_edge_iterator : public edge_iterator { |
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| 286 | friend class list_graph; |
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| 287 | node_item* v; |
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| 288 | public: |
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| 289 | in_edge_iterator() : edge_iterator(), v(0) { } |
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| 290 | protected: |
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| 291 | in_edge_iterator(const node_iterator& _v) : v(_v.node) { |
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| 292 | edge=v->_first_in_edge; |
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| 293 | } |
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| 294 | public: |
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| 295 | in_edge_iterator& operator++() { edge=edge->_next_in; return *this; } |
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| 296 | protected: |
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| 297 | node_iterator a_node() const { return node_iterator(v); } |
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| 298 | node_iterator b_node() const { |
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[13] | 299 | return (edge->_tail==v) ? node_iterator(edge->_head) : node_iterator(edge->_tail); } |
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[9] | 300 | }; |
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| 301 | |
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| 302 | class sym_edge_iterator : public edge_iterator { |
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| 303 | friend class list_graph; |
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| 304 | bool out_or_in; //1 iff out, 0 iff in |
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| 305 | node_item* v; |
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| 306 | public: |
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| 307 | sym_edge_iterator() : edge_iterator(), v(0) { } |
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| 308 | protected: |
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| 309 | sym_edge_iterator(const node_iterator& _v) : v(_v.node) { |
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| 310 | out_or_in=1; |
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| 311 | edge=v->_first_out_edge; |
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| 312 | if (!edge) { edge=v->_first_in_edge; out_or_in=0; } |
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| 313 | } |
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| 314 | public: |
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| 315 | sym_edge_iterator& operator++() { |
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| 316 | if (out_or_in) { |
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| 317 | edge=edge->_next_out; |
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| 318 | if (!edge) { out_or_in=0; edge=v->_first_in_edge; } |
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| 319 | } else { |
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| 320 | edge=edge->_next_in; |
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| 321 | } |
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| 322 | return *this; |
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| 323 | } |
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| 324 | protected: |
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| 325 | node_iterator a_node() const { return node_iterator(v); } |
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| 326 | node_iterator b_node() const { |
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[13] | 327 | return (edge->_tail==v) ? node_iterator(edge->_head) : node_iterator(edge->_tail); } |
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[9] | 328 | }; |
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| 329 | |
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| 330 | }; |
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| 331 | |
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| 332 | |
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| 333 | |
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| 334 | } //namespace marci |
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| 335 | |
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| 336 | #endif //MARCI_LIST_GRAPH_HH |
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