[948] | 1 | /* -*- C++ -*- |
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| 2 | * |
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[1956] | 3 | * This file is a part of LEMON, a generic C++ optimization library |
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| 4 | * |
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[2391] | 5 | * Copyright (C) 2003-2007 |
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[1956] | 6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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[1359] | 7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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[948] | 8 | * |
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| 9 | * Permission to use, modify and distribute this software is granted |
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| 10 | * provided that this copyright notice appears in all copies. For |
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| 11 | * precise terms see the accompanying LICENSE file. |
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| 12 | * |
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| 13 | * This software is provided "AS IS" with no warranty of any kind, |
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| 14 | * express or implied, and with no claim as to its suitability for any |
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| 15 | * purpose. |
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| 16 | * |
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| 17 | */ |
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[395] | 18 | |
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[921] | 19 | #ifndef LEMON_LIST_GRAPH_H |
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| 20 | #define LEMON_LIST_GRAPH_H |
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[395] | 21 | |
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[948] | 22 | ///\ingroup graphs |
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| 23 | ///\file |
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[2116] | 24 | ///\brief ListGraph, ListUGraph classes. |
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[948] | 25 | |
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[2116] | 26 | #include <lemon/bits/base_extender.h> |
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[1791] | 27 | #include <lemon/bits/graph_extender.h> |
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[782] | 28 | |
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[2116] | 29 | #include <lemon/error.h> |
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| 30 | |
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[1979] | 31 | #include <vector> |
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[1011] | 32 | #include <list> |
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[782] | 33 | |
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[921] | 34 | namespace lemon { |
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[395] | 35 | |
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[946] | 36 | class ListGraphBase { |
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[406] | 37 | |
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[949] | 38 | protected: |
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[946] | 39 | struct NodeT { |
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[1470] | 40 | int first_in, first_out; |
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[397] | 41 | int prev, next; |
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[395] | 42 | }; |
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[946] | 43 | |
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| 44 | struct EdgeT { |
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[986] | 45 | int target, source; |
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[397] | 46 | int prev_in, prev_out; |
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| 47 | int next_in, next_out; |
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[395] | 48 | }; |
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| 49 | |
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| 50 | std::vector<NodeT> nodes; |
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[946] | 51 | |
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[397] | 52 | int first_node; |
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[946] | 53 | |
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[397] | 54 | int first_free_node; |
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[946] | 55 | |
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[395] | 56 | std::vector<EdgeT> edges; |
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[946] | 57 | |
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[397] | 58 | int first_free_edge; |
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[395] | 59 | |
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[782] | 60 | public: |
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[395] | 61 | |
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[946] | 62 | typedef ListGraphBase Graph; |
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[397] | 63 | |
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[946] | 64 | class Node { |
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[975] | 65 | friend class ListGraphBase; |
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[946] | 66 | protected: |
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[395] | 67 | |
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[946] | 68 | int id; |
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[2031] | 69 | explicit Node(int pid) { id = pid;} |
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[395] | 70 | |
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[946] | 71 | public: |
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| 72 | Node() {} |
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| 73 | Node (Invalid) { id = -1; } |
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| 74 | bool operator==(const Node& node) const {return id == node.id;} |
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| 75 | bool operator!=(const Node& node) const {return id != node.id;} |
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| 76 | bool operator<(const Node& node) const {return id < node.id;} |
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| 77 | }; |
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[782] | 78 | |
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[946] | 79 | class Edge { |
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[975] | 80 | friend class ListGraphBase; |
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[946] | 81 | protected: |
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[782] | 82 | |
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[946] | 83 | int id; |
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[2031] | 84 | explicit Edge(int pid) { id = pid;} |
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[395] | 85 | |
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[946] | 86 | public: |
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| 87 | Edge() {} |
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| 88 | Edge (Invalid) { id = -1; } |
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| 89 | bool operator==(const Edge& edge) const {return id == edge.id;} |
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| 90 | bool operator!=(const Edge& edge) const {return id != edge.id;} |
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| 91 | bool operator<(const Edge& edge) const {return id < edge.id;} |
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| 92 | }; |
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| 93 | |
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| 94 | |
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| 95 | |
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| 96 | ListGraphBase() |
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[782] | 97 | : nodes(), first_node(-1), |
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| 98 | first_free_node(-1), edges(), first_free_edge(-1) {} |
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| 99 | |
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[395] | 100 | |
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[1791] | 101 | int maxNodeId() const { return nodes.size()-1; } |
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| 102 | int maxEdgeId() const { return edges.size()-1; } |
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[395] | 103 | |
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[2031] | 104 | Node source(Edge e) const { return Node(edges[e.id].source); } |
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| 105 | Node target(Edge e) const { return Node(edges[e.id].target); } |
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[395] | 106 | |
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| 107 | |
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[946] | 108 | void first(Node& node) const { |
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| 109 | node.id = first_node; |
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| 110 | } |
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| 111 | |
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| 112 | void next(Node& node) const { |
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| 113 | node.id = nodes[node.id].next; |
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| 114 | } |
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| 115 | |
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| 116 | |
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| 117 | void first(Edge& e) const { |
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| 118 | int n; |
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| 119 | for(n = first_node; |
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| 120 | n!=-1 && nodes[n].first_in == -1; |
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| 121 | n = nodes[n].next); |
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| 122 | e.id = (n == -1) ? -1 : nodes[n].first_in; |
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| 123 | } |
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| 124 | |
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| 125 | void next(Edge& edge) const { |
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| 126 | if (edges[edge.id].next_in != -1) { |
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| 127 | edge.id = edges[edge.id].next_in; |
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| 128 | } else { |
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| 129 | int n; |
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[986] | 130 | for(n = nodes[edges[edge.id].target].next; |
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[946] | 131 | n!=-1 && nodes[n].first_in == -1; |
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| 132 | n = nodes[n].next); |
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| 133 | edge.id = (n == -1) ? -1 : nodes[n].first_in; |
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| 134 | } |
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| 135 | } |
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| 136 | |
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| 137 | void firstOut(Edge &e, const Node& v) const { |
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| 138 | e.id = nodes[v.id].first_out; |
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| 139 | } |
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| 140 | void nextOut(Edge &e) const { |
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| 141 | e.id=edges[e.id].next_out; |
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| 142 | } |
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| 143 | |
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| 144 | void firstIn(Edge &e, const Node& v) const { |
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| 145 | e.id = nodes[v.id].first_in; |
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| 146 | } |
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| 147 | void nextIn(Edge &e) const { |
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| 148 | e.id=edges[e.id].next_in; |
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| 149 | } |
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| 150 | |
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[813] | 151 | |
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[946] | 152 | static int id(Node v) { return v.id; } |
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| 153 | static int id(Edge e) { return e.id; } |
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[395] | 154 | |
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[1791] | 155 | static Node nodeFromId(int id) { return Node(id);} |
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| 156 | static Edge edgeFromId(int id) { return Edge(id);} |
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[1106] | 157 | |
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[946] | 158 | Node addNode() { |
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[397] | 159 | int n; |
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| 160 | |
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[946] | 161 | if(first_free_node==-1) { |
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| 162 | n = nodes.size(); |
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| 163 | nodes.push_back(NodeT()); |
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| 164 | } else { |
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[397] | 165 | n = first_free_node; |
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| 166 | first_free_node = nodes[n].next; |
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| 167 | } |
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| 168 | |
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| 169 | nodes[n].next = first_node; |
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| 170 | if(first_node != -1) nodes[first_node].prev = n; |
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| 171 | first_node = n; |
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| 172 | nodes[n].prev = -1; |
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| 173 | |
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| 174 | nodes[n].first_in = nodes[n].first_out = -1; |
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| 175 | |
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[946] | 176 | return Node(n); |
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[395] | 177 | } |
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| 178 | |
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| 179 | Edge addEdge(Node u, Node v) { |
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[946] | 180 | int n; |
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| 181 | |
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| 182 | if (first_free_edge == -1) { |
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| 183 | n = edges.size(); |
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| 184 | edges.push_back(EdgeT()); |
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| 185 | } else { |
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[397] | 186 | n = first_free_edge; |
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| 187 | first_free_edge = edges[n].next_in; |
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| 188 | } |
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| 189 | |
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[986] | 190 | edges[n].source = u.id; |
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| 191 | edges[n].target = v.id; |
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[395] | 192 | |
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[946] | 193 | edges[n].next_out = nodes[u.id].first_out; |
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| 194 | if(nodes[u.id].first_out != -1) { |
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| 195 | edges[nodes[u.id].first_out].prev_out = n; |
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| 196 | } |
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| 197 | |
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| 198 | edges[n].next_in = nodes[v.id].first_in; |
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| 199 | if(nodes[v.id].first_in != -1) { |
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| 200 | edges[nodes[v.id].first_in].prev_in = n; |
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| 201 | } |
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| 202 | |
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[397] | 203 | edges[n].prev_in = edges[n].prev_out = -1; |
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| 204 | |
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[946] | 205 | nodes[u.id].first_out = nodes[v.id].first_in = n; |
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[397] | 206 | |
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[946] | 207 | return Edge(n); |
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[395] | 208 | } |
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[774] | 209 | |
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[946] | 210 | void erase(const Node& node) { |
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| 211 | int n = node.id; |
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| 212 | |
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| 213 | if(nodes[n].next != -1) { |
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| 214 | nodes[nodes[n].next].prev = nodes[n].prev; |
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| 215 | } |
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| 216 | |
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| 217 | if(nodes[n].prev != -1) { |
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| 218 | nodes[nodes[n].prev].next = nodes[n].next; |
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| 219 | } else { |
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| 220 | first_node = nodes[n].next; |
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| 221 | } |
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| 222 | |
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| 223 | nodes[n].next = first_free_node; |
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| 224 | first_free_node = n; |
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[395] | 225 | |
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[774] | 226 | } |
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| 227 | |
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[946] | 228 | void erase(const Edge& edge) { |
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| 229 | int n = edge.id; |
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[397] | 230 | |
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[946] | 231 | if(edges[n].next_in!=-1) { |
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[397] | 232 | edges[edges[n].next_in].prev_in = edges[n].prev_in; |
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[946] | 233 | } |
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| 234 | |
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| 235 | if(edges[n].prev_in!=-1) { |
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[397] | 236 | edges[edges[n].prev_in].next_in = edges[n].next_in; |
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[946] | 237 | } else { |
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[986] | 238 | nodes[edges[n].target].first_in = edges[n].next_in; |
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[946] | 239 | } |
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| 240 | |
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[397] | 241 | |
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[946] | 242 | if(edges[n].next_out!=-1) { |
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[397] | 243 | edges[edges[n].next_out].prev_out = edges[n].prev_out; |
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[946] | 244 | } |
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| 245 | |
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| 246 | if(edges[n].prev_out!=-1) { |
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[397] | 247 | edges[edges[n].prev_out].next_out = edges[n].next_out; |
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[946] | 248 | } else { |
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[986] | 249 | nodes[edges[n].source].first_out = edges[n].next_out; |
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[946] | 250 | } |
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[397] | 251 | |
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| 252 | edges[n].next_in = first_free_edge; |
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[695] | 253 | first_free_edge = n; |
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[397] | 254 | |
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| 255 | } |
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| 256 | |
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| 257 | void clear() { |
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[782] | 258 | edges.clear(); |
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| 259 | nodes.clear(); |
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[946] | 260 | first_node = first_free_node = first_free_edge = -1; |
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[937] | 261 | } |
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| 262 | |
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[949] | 263 | protected: |
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[2111] | 264 | void changeTarget(Edge e, Node n) |
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[949] | 265 | { |
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| 266 | if(edges[e.id].next_in != -1) |
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| 267 | edges[edges[e.id].next_in].prev_in = edges[e.id].prev_in; |
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| 268 | if(edges[e.id].prev_in != -1) |
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| 269 | edges[edges[e.id].prev_in].next_in = edges[e.id].next_in; |
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[986] | 270 | else nodes[edges[e.id].target].first_in = edges[e.id].next_in; |
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[1702] | 271 | if (nodes[n.id].first_in != -1) { |
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| 272 | edges[nodes[n.id].first_in].prev_in = e.id; |
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| 273 | } |
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[986] | 274 | edges[e.id].target = n.id; |
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[949] | 275 | edges[e.id].prev_in = -1; |
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| 276 | edges[e.id].next_in = nodes[n.id].first_in; |
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| 277 | nodes[n.id].first_in = e.id; |
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| 278 | } |
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[2111] | 279 | void changeSource(Edge e, Node n) |
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[949] | 280 | { |
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| 281 | if(edges[e.id].next_out != -1) |
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| 282 | edges[edges[e.id].next_out].prev_out = edges[e.id].prev_out; |
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| 283 | if(edges[e.id].prev_out != -1) |
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| 284 | edges[edges[e.id].prev_out].next_out = edges[e.id].next_out; |
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[986] | 285 | else nodes[edges[e.id].source].first_out = edges[e.id].next_out; |
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[1702] | 286 | if (nodes[n.id].first_out != -1) { |
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| 287 | edges[nodes[n.id].first_out].prev_out = e.id; |
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| 288 | } |
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[986] | 289 | edges[e.id].source = n.id; |
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[949] | 290 | edges[e.id].prev_out = -1; |
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| 291 | edges[e.id].next_out = nodes[n.id].first_out; |
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| 292 | nodes[n.id].first_out = e.id; |
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| 293 | } |
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| 294 | |
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[919] | 295 | }; |
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[909] | 296 | |
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[1979] | 297 | typedef GraphExtender<ListGraphBase> ExtendedListGraphBase; |
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[400] | 298 | |
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[2116] | 299 | /// \addtogroup graphs |
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| 300 | /// @{ |
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[400] | 301 | |
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[948] | 302 | ///A list graph class. |
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[400] | 303 | |
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[2117] | 304 | ///This is a simple and fast graph implementation. |
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[948] | 305 | /// |
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[2260] | 306 | ///It conforms to the \ref concepts::Graph "Graph concept" and it |
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[2111] | 307 | ///also provides several additional useful extra functionalities. |
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| 308 | ///The most of the member functions and nested classes are |
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| 309 | ///documented only in the concept class. |
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[2256] | 310 | /// |
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| 311 | ///An important extra feature of this graph implementation is that |
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[2260] | 312 | ///its maps are real \ref concepts::ReferenceMap "reference map"s. |
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[2256] | 313 | /// |
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[2260] | 314 | ///\sa concepts::Graph. |
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[782] | 315 | |
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[1999] | 316 | class ListGraph : public ExtendedListGraphBase { |
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[2128] | 317 | private: |
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| 318 | ///ListGraph is \e not copy constructible. Use GraphCopy() instead. |
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| 319 | |
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| 320 | ///ListGraph is \e not copy constructible. Use GraphCopy() instead. |
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| 321 | /// |
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| 322 | ListGraph(const ListGraph &) :ExtendedListGraphBase() {}; |
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[2132] | 323 | ///\brief Assignment of ListGraph to another one is \e not allowed. |
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[2128] | 324 | ///Use GraphCopy() instead. |
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| 325 | |
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[2132] | 326 | ///Assignment of ListGraph to another one is \e not allowed. |
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[2128] | 327 | ///Use GraphCopy() instead. |
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| 328 | void operator=(const ListGraph &) {} |
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[948] | 329 | public: |
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[1999] | 330 | |
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| 331 | typedef ExtendedListGraphBase Parent; |
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| 332 | |
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[2128] | 333 | /// Constructor |
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| 334 | |
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| 335 | /// Constructor. |
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| 336 | /// |
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| 337 | ListGraph() {} |
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| 338 | |
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[2111] | 339 | ///Add a new node to the graph. |
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| 340 | |
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| 341 | /// \return the new node. |
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| 342 | /// |
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| 343 | Node addNode() { return Parent::addNode(); } |
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| 344 | |
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| 345 | ///Add a new edge to the graph. |
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| 346 | |
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| 347 | ///Add a new edge to the graph with source node \c s |
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| 348 | ///and target node \c t. |
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| 349 | ///\return the new edge. |
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| 350 | Edge addEdge(const Node& s, const Node& t) { |
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| 351 | return Parent::addEdge(s, t); |
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| 352 | } |
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| 353 | |
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[1546] | 354 | /// Changes the target of \c e to \c n |
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[948] | 355 | |
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[1546] | 356 | /// Changes the target of \c e to \c n |
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[948] | 357 | /// |
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[2160] | 358 | ///\note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s referencing |
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[2114] | 359 | ///the changed edge remain valid. However <tt>InEdgeIt</tt>s are |
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| 360 | ///invalidated. |
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[2123] | 361 | ///\warning This functionality cannot be used together with the Snapshot |
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| 362 | ///feature. |
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[1718] | 363 | void changeTarget(Edge e, Node n) { |
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[2111] | 364 | Parent::changeTarget(e,n); |
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[1718] | 365 | } |
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[1546] | 366 | /// Changes the source of \c e to \c n |
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[948] | 367 | |
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[1546] | 368 | /// Changes the source of \c e to \c n |
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[948] | 369 | /// |
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[2160] | 370 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s referencing |
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[2114] | 371 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
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| 372 | ///invalidated. |
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[2123] | 373 | ///\warning This functionality cannot be used together with the Snapshot |
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| 374 | ///feature. |
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[1718] | 375 | void changeSource(Edge e, Node n) { |
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[2111] | 376 | Parent::changeSource(e,n); |
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[1718] | 377 | } |
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[949] | 378 | |
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[1010] | 379 | /// Invert the direction of an edge. |
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| 380 | |
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[2160] | 381 | ///\note The <tt>EdgeIt</tt>s referencing the changed edge remain |
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[2114] | 382 | ///valid. However <tt>OutEdgeIt</tt>s and <tt>InEdgeIt</tt>s are |
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| 383 | ///invalidated. |
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[2123] | 384 | ///\warning This functionality cannot be used together with the Snapshot |
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| 385 | ///feature. |
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[1010] | 386 | void reverseEdge(Edge e) { |
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| 387 | Node t=target(e); |
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[2111] | 388 | changeTarget(e,source(e)); |
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| 389 | changeSource(e,t); |
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[1010] | 390 | } |
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| 391 | |
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[2111] | 392 | /// \brief Using this it is possible to avoid the superfluous memory |
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| 393 | /// allocation. |
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[1010] | 394 | |
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[2107] | 395 | ///Using this it is possible to avoid the superfluous memory |
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| 396 | ///allocation: if you know that the graph you want to build will |
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[2123] | 397 | ///contain at least 10 million nodes then it is worth reserving |
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[2107] | 398 | ///space for this amount before starting to build the graph. |
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| 399 | void reserveNode(int n) { nodes.reserve(n); }; |
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| 400 | |
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[2111] | 401 | /// \brief Using this it is possible to avoid the superfluous memory |
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| 402 | /// allocation. |
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[2107] | 403 | |
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| 404 | ///Using this it is possible to avoid the superfluous memory |
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| 405 | ///allocation: see the \ref reserveNode function. |
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[949] | 406 | void reserveEdge(int n) { edges.reserve(n); }; |
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[1010] | 407 | |
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[2107] | 408 | |
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[1010] | 409 | ///Contract two nodes. |
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| 410 | |
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| 411 | ///This function contracts two nodes. |
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| 412 | /// |
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| 413 | ///Node \p b will be removed but instead of deleting |
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[2102] | 414 | ///incident edges, they will be joined to \p a. |
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[1010] | 415 | ///The last parameter \p r controls whether to remove loops. \c true |
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| 416 | ///means that loops will be removed. |
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| 417 | /// |
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[2160] | 418 | ///\note The <tt>EdgeIt</tt>s |
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[1281] | 419 | ///referencing a moved edge remain |
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[2160] | 420 | ///valid. However <tt>InEdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
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[1010] | 421 | ///may be invalidated. |
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[2123] | 422 | ///\warning This functionality cannot be used together with the Snapshot |
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| 423 | ///feature. |
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[1718] | 424 | void contract(Node a, Node b, bool r = true) |
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[1010] | 425 | { |
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| 426 | for(OutEdgeIt e(*this,b);e!=INVALID;) { |
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| 427 | OutEdgeIt f=e; |
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| 428 | ++f; |
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| 429 | if(r && target(e)==a) erase(e); |
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[1546] | 430 | else changeSource(e,a); |
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[1010] | 431 | e=f; |
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| 432 | } |
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| 433 | for(InEdgeIt e(*this,b);e!=INVALID;) { |
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| 434 | InEdgeIt f=e; |
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| 435 | ++f; |
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| 436 | if(r && source(e)==a) erase(e); |
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[1546] | 437 | else changeTarget(e,a); |
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[1010] | 438 | e=f; |
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| 439 | } |
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| 440 | erase(b); |
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| 441 | } |
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[1011] | 442 | |
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[1281] | 443 | ///Split a node. |
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[1011] | 444 | |
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[1284] | 445 | ///This function splits a node. First a new node is added to the graph, |
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| 446 | ///then the source of each outgoing edge of \c n is moved to this new node. |
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[1281] | 447 | ///If \c connect is \c true (this is the default value), then a new edge |
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| 448 | ///from \c n to the newly created node is also added. |
---|
| 449 | ///\return The newly created node. |
---|
| 450 | /// |
---|
[2160] | 451 | ///\note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
| 452 | ///valid. However <tt>InEdgeIt</tt>s and <tt>OutEdgeIt</tt>s may |
---|
| 453 | ///be invalidated. |
---|
| 454 | /// |
---|
| 455 | ///\warning This functionality cannot be used together with the |
---|
| 456 | ///Snapshot feature. \todo It could be implemented in a bit |
---|
| 457 | ///faster way. |
---|
[2114] | 458 | Node split(Node n, bool connect = true) { |
---|
[1281] | 459 | Node b = addNode(); |
---|
| 460 | for(OutEdgeIt e(*this,n);e!=INVALID;) { |
---|
| 461 | OutEdgeIt f=e; |
---|
| 462 | ++f; |
---|
[1546] | 463 | changeSource(e,b); |
---|
[1281] | 464 | e=f; |
---|
| 465 | } |
---|
[2114] | 466 | if (connect) addEdge(n,b); |
---|
[1281] | 467 | return b; |
---|
| 468 | } |
---|
| 469 | |
---|
[1812] | 470 | ///Split an edge. |
---|
| 471 | |
---|
[2102] | 472 | ///This function splits an edge. First a new node \c b is added to |
---|
| 473 | ///the graph, then the original edge is re-targeted to \c |
---|
| 474 | ///b. Finally an edge from \c b to the original target is added. |
---|
| 475 | ///\return The newly created node. |
---|
| 476 | ///\warning This functionality |
---|
| 477 | ///cannot be used together with the Snapshot feature. |
---|
[2114] | 478 | Node split(Edge e) { |
---|
[1812] | 479 | Node b = addNode(); |
---|
| 480 | addEdge(b,target(e)); |
---|
| 481 | changeTarget(e,b); |
---|
| 482 | return b; |
---|
| 483 | } |
---|
| 484 | |
---|
[2114] | 485 | /// \brief Class to make a snapshot of the graph and restore |
---|
| 486 | /// to it later. |
---|
[1011] | 487 | /// |
---|
[2114] | 488 | /// Class to make a snapshot of the graph and to restore it |
---|
| 489 | /// later. |
---|
[1011] | 490 | /// |
---|
[2114] | 491 | /// The newly added nodes and edges can be removed using the |
---|
| 492 | /// restore() function. |
---|
| 493 | /// |
---|
[2189] | 494 | /// \warning Edge and node deletions cannot be restored. This |
---|
| 495 | /// events invalidate the snapshot. |
---|
[2114] | 496 | class Snapshot { |
---|
[1999] | 497 | protected: |
---|
[2114] | 498 | |
---|
| 499 | typedef Parent::NodeNotifier NodeNotifier; |
---|
| 500 | |
---|
| 501 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
| 502 | public: |
---|
| 503 | |
---|
| 504 | NodeObserverProxy(Snapshot& _snapshot) |
---|
| 505 | : snapshot(_snapshot) {} |
---|
| 506 | |
---|
| 507 | using NodeNotifier::ObserverBase::attach; |
---|
| 508 | using NodeNotifier::ObserverBase::detach; |
---|
| 509 | using NodeNotifier::ObserverBase::attached; |
---|
| 510 | |
---|
| 511 | protected: |
---|
| 512 | |
---|
| 513 | virtual void add(const Node& node) { |
---|
| 514 | snapshot.addNode(node); |
---|
| 515 | } |
---|
| 516 | virtual void add(const std::vector<Node>& nodes) { |
---|
| 517 | for (int i = nodes.size() - 1; i >= 0; ++i) { |
---|
| 518 | snapshot.addNode(nodes[i]); |
---|
| 519 | } |
---|
| 520 | } |
---|
| 521 | virtual void erase(const Node& node) { |
---|
| 522 | snapshot.eraseNode(node); |
---|
| 523 | } |
---|
| 524 | virtual void erase(const std::vector<Node>& nodes) { |
---|
[2386] | 525 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
[2189] | 526 | snapshot.eraseNode(nodes[i]); |
---|
[2114] | 527 | } |
---|
| 528 | } |
---|
| 529 | virtual void build() { |
---|
| 530 | Node node; |
---|
| 531 | std::vector<Node> nodes; |
---|
[2386] | 532 | for (notifier()->first(node); node != INVALID; |
---|
| 533 | notifier()->next(node)) { |
---|
[2114] | 534 | nodes.push_back(node); |
---|
| 535 | } |
---|
| 536 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
| 537 | snapshot.addNode(nodes[i]); |
---|
| 538 | } |
---|
| 539 | } |
---|
| 540 | virtual void clear() { |
---|
| 541 | Node node; |
---|
[2386] | 542 | for (notifier()->first(node); node != INVALID; |
---|
| 543 | notifier()->next(node)) { |
---|
[2189] | 544 | snapshot.eraseNode(node); |
---|
[2114] | 545 | } |
---|
| 546 | } |
---|
| 547 | |
---|
| 548 | Snapshot& snapshot; |
---|
| 549 | }; |
---|
| 550 | |
---|
| 551 | class EdgeObserverProxy : public EdgeNotifier::ObserverBase { |
---|
| 552 | public: |
---|
| 553 | |
---|
| 554 | EdgeObserverProxy(Snapshot& _snapshot) |
---|
| 555 | : snapshot(_snapshot) {} |
---|
| 556 | |
---|
| 557 | using EdgeNotifier::ObserverBase::attach; |
---|
| 558 | using EdgeNotifier::ObserverBase::detach; |
---|
| 559 | using EdgeNotifier::ObserverBase::attached; |
---|
| 560 | |
---|
| 561 | protected: |
---|
| 562 | |
---|
| 563 | virtual void add(const Edge& edge) { |
---|
| 564 | snapshot.addEdge(edge); |
---|
| 565 | } |
---|
| 566 | virtual void add(const std::vector<Edge>& edges) { |
---|
| 567 | for (int i = edges.size() - 1; i >= 0; ++i) { |
---|
| 568 | snapshot.addEdge(edges[i]); |
---|
| 569 | } |
---|
| 570 | } |
---|
| 571 | virtual void erase(const Edge& edge) { |
---|
| 572 | snapshot.eraseEdge(edge); |
---|
| 573 | } |
---|
| 574 | virtual void erase(const std::vector<Edge>& edges) { |
---|
[2386] | 575 | for (int i = 0; i < int(edges.size()); ++i) { |
---|
[2189] | 576 | snapshot.eraseEdge(edges[i]); |
---|
[2114] | 577 | } |
---|
| 578 | } |
---|
| 579 | virtual void build() { |
---|
| 580 | Edge edge; |
---|
| 581 | std::vector<Edge> edges; |
---|
[2386] | 582 | for (notifier()->first(edge); edge != INVALID; |
---|
| 583 | notifier()->next(edge)) { |
---|
[2114] | 584 | edges.push_back(edge); |
---|
| 585 | } |
---|
| 586 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
| 587 | snapshot.addEdge(edges[i]); |
---|
| 588 | } |
---|
| 589 | } |
---|
| 590 | virtual void clear() { |
---|
| 591 | Edge edge; |
---|
[2386] | 592 | for (notifier()->first(edge); edge != INVALID; |
---|
| 593 | notifier()->next(edge)) { |
---|
[2189] | 594 | snapshot.eraseEdge(edge); |
---|
[2114] | 595 | } |
---|
| 596 | } |
---|
| 597 | |
---|
| 598 | Snapshot& snapshot; |
---|
| 599 | }; |
---|
[1011] | 600 | |
---|
[2114] | 601 | ListGraph *graph; |
---|
| 602 | |
---|
| 603 | NodeObserverProxy node_observer_proxy; |
---|
| 604 | EdgeObserverProxy edge_observer_proxy; |
---|
| 605 | |
---|
[1011] | 606 | std::list<Node> added_nodes; |
---|
| 607 | std::list<Edge> added_edges; |
---|
[2114] | 608 | |
---|
| 609 | |
---|
| 610 | void addNode(const Node& node) { |
---|
| 611 | added_nodes.push_front(node); |
---|
[1011] | 612 | } |
---|
[2189] | 613 | void eraseNode(const Node& node) { |
---|
[2114] | 614 | std::list<Node>::iterator it = |
---|
| 615 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
| 616 | if (it == added_nodes.end()) { |
---|
| 617 | clear(); |
---|
[2189] | 618 | edge_observer_proxy.detach(); |
---|
| 619 | throw NodeNotifier::ImmediateDetach(); |
---|
[2114] | 620 | } else { |
---|
| 621 | added_nodes.erase(it); |
---|
| 622 | } |
---|
[1011] | 623 | } |
---|
| 624 | |
---|
[2114] | 625 | void addEdge(const Edge& edge) { |
---|
| 626 | added_edges.push_front(edge); |
---|
| 627 | } |
---|
[2189] | 628 | void eraseEdge(const Edge& edge) { |
---|
[2114] | 629 | std::list<Edge>::iterator it = |
---|
| 630 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
| 631 | if (it == added_edges.end()) { |
---|
| 632 | clear(); |
---|
[2189] | 633 | node_observer_proxy.detach(); |
---|
| 634 | throw EdgeNotifier::ImmediateDetach(); |
---|
[2114] | 635 | } else { |
---|
| 636 | added_edges.erase(it); |
---|
| 637 | } |
---|
| 638 | } |
---|
[1457] | 639 | |
---|
[2114] | 640 | void attach(ListGraph &_graph) { |
---|
| 641 | graph = &_graph; |
---|
[2381] | 642 | node_observer_proxy.attach(graph->notifier(Node())); |
---|
| 643 | edge_observer_proxy.attach(graph->notifier(Edge())); |
---|
[1011] | 644 | } |
---|
| 645 | |
---|
[2114] | 646 | void detach() { |
---|
| 647 | node_observer_proxy.detach(); |
---|
| 648 | edge_observer_proxy.detach(); |
---|
| 649 | } |
---|
| 650 | |
---|
[2189] | 651 | bool attached() const { |
---|
| 652 | return node_observer_proxy.attached(); |
---|
| 653 | } |
---|
| 654 | |
---|
[2114] | 655 | void clear() { |
---|
| 656 | added_nodes.clear(); |
---|
| 657 | added_edges.clear(); |
---|
[1011] | 658 | } |
---|
[1774] | 659 | |
---|
[1011] | 660 | public: |
---|
[2114] | 661 | |
---|
[2160] | 662 | /// \brief Default constructor. |
---|
[2114] | 663 | /// |
---|
| 664 | /// Default constructor. |
---|
| 665 | /// To actually make a snapshot you must call save(). |
---|
| 666 | Snapshot() |
---|
| 667 | : graph(0), node_observer_proxy(*this), |
---|
| 668 | edge_observer_proxy(*this) {} |
---|
[1011] | 669 | |
---|
[2114] | 670 | /// \brief Constructor that immediately makes a snapshot. |
---|
| 671 | /// |
---|
| 672 | /// This constructor immediately makes a snapshot of the graph. |
---|
| 673 | /// \param _graph The graph we make a snapshot of. |
---|
| 674 | Snapshot(ListGraph &_graph) |
---|
| 675 | : node_observer_proxy(*this), |
---|
| 676 | edge_observer_proxy(*this) { |
---|
| 677 | attach(_graph); |
---|
[1011] | 678 | } |
---|
| 679 | |
---|
[2114] | 680 | /// \brief Make a snapshot. |
---|
[1011] | 681 | /// |
---|
[2114] | 682 | /// Make a snapshot of the graph. |
---|
| 683 | /// |
---|
| 684 | /// This function can be called more than once. In case of a repeated |
---|
| 685 | /// call, the previous snapshot gets lost. |
---|
| 686 | /// \param _graph The graph we make the snapshot of. |
---|
| 687 | void save(ListGraph &_graph) { |
---|
[2189] | 688 | if (attached()) { |
---|
| 689 | detach(); |
---|
| 690 | clear(); |
---|
| 691 | } |
---|
[2114] | 692 | attach(_graph); |
---|
[1011] | 693 | } |
---|
| 694 | |
---|
[2114] | 695 | /// \brief Undo the changes until the last snapshot. |
---|
| 696 | // |
---|
[2123] | 697 | /// Undo the changes until the last snapshot created by save(). |
---|
[1011] | 698 | void restore() { |
---|
[2114] | 699 | detach(); |
---|
[2189] | 700 | for(std::list<Edge>::iterator it = added_edges.begin(); |
---|
| 701 | it != added_edges.end(); ++it) { |
---|
| 702 | graph->erase(*it); |
---|
[1011] | 703 | } |
---|
[2189] | 704 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
| 705 | it != added_nodes.end(); ++it) { |
---|
| 706 | graph->erase(*it); |
---|
[1011] | 707 | } |
---|
[2189] | 708 | clear(); |
---|
[1011] | 709 | } |
---|
[2114] | 710 | |
---|
| 711 | /// \brief Gives back true when the snapshot is valid. |
---|
| 712 | /// |
---|
| 713 | /// Gives back true when the snapshot is valid. |
---|
| 714 | bool valid() const { |
---|
[2189] | 715 | return attached(); |
---|
[2114] | 716 | } |
---|
[1011] | 717 | }; |
---|
| 718 | |
---|
[949] | 719 | }; |
---|
[1034] | 720 | |
---|
[2116] | 721 | ///@} |
---|
| 722 | |
---|
[2338] | 723 | class ListUGraphBase { |
---|
[2116] | 724 | |
---|
[2338] | 725 | protected: |
---|
| 726 | |
---|
| 727 | struct NodeT { |
---|
| 728 | int first_out; |
---|
| 729 | int prev, next; |
---|
| 730 | }; |
---|
| 731 | |
---|
| 732 | struct EdgeT { |
---|
| 733 | int target; |
---|
| 734 | int prev_out, next_out; |
---|
| 735 | }; |
---|
| 736 | |
---|
| 737 | std::vector<NodeT> nodes; |
---|
| 738 | |
---|
| 739 | int first_node; |
---|
| 740 | |
---|
| 741 | int first_free_node; |
---|
| 742 | |
---|
| 743 | std::vector<EdgeT> edges; |
---|
| 744 | |
---|
| 745 | int first_free_edge; |
---|
| 746 | |
---|
| 747 | public: |
---|
| 748 | |
---|
| 749 | typedef ListUGraphBase Graph; |
---|
[2343] | 750 | |
---|
| 751 | class Node; |
---|
| 752 | class Edge; |
---|
| 753 | class UEdge; |
---|
[2338] | 754 | |
---|
| 755 | class Node { |
---|
| 756 | friend class ListUGraphBase; |
---|
| 757 | protected: |
---|
| 758 | |
---|
| 759 | int id; |
---|
| 760 | explicit Node(int pid) { id = pid;} |
---|
| 761 | |
---|
| 762 | public: |
---|
| 763 | Node() {} |
---|
| 764 | Node (Invalid) { id = -1; } |
---|
| 765 | bool operator==(const Node& node) const {return id == node.id;} |
---|
| 766 | bool operator!=(const Node& node) const {return id != node.id;} |
---|
| 767 | bool operator<(const Node& node) const {return id < node.id;} |
---|
| 768 | }; |
---|
| 769 | |
---|
| 770 | class UEdge { |
---|
| 771 | friend class ListUGraphBase; |
---|
| 772 | protected: |
---|
| 773 | |
---|
| 774 | int id; |
---|
| 775 | explicit UEdge(int pid) { id = pid;} |
---|
| 776 | |
---|
| 777 | public: |
---|
| 778 | UEdge() {} |
---|
| 779 | UEdge (Invalid) { id = -1; } |
---|
| 780 | bool operator==(const UEdge& edge) const {return id == edge.id;} |
---|
| 781 | bool operator!=(const UEdge& edge) const {return id != edge.id;} |
---|
| 782 | bool operator<(const UEdge& edge) const {return id < edge.id;} |
---|
| 783 | }; |
---|
| 784 | |
---|
| 785 | class Edge { |
---|
| 786 | friend class ListUGraphBase; |
---|
| 787 | protected: |
---|
| 788 | |
---|
| 789 | int id; |
---|
| 790 | explicit Edge(int pid) { id = pid;} |
---|
| 791 | |
---|
| 792 | public: |
---|
[2343] | 793 | operator UEdge() const { return uEdgeFromId(id / 2); } |
---|
[2338] | 794 | |
---|
| 795 | Edge() {} |
---|
| 796 | Edge (Invalid) { id = -1; } |
---|
| 797 | bool operator==(const Edge& edge) const {return id == edge.id;} |
---|
| 798 | bool operator!=(const Edge& edge) const {return id != edge.id;} |
---|
| 799 | bool operator<(const Edge& edge) const {return id < edge.id;} |
---|
| 800 | }; |
---|
| 801 | |
---|
| 802 | |
---|
| 803 | |
---|
| 804 | ListUGraphBase() |
---|
| 805 | : nodes(), first_node(-1), |
---|
| 806 | first_free_node(-1), edges(), first_free_edge(-1) {} |
---|
| 807 | |
---|
| 808 | |
---|
| 809 | int maxNodeId() const { return nodes.size()-1; } |
---|
| 810 | int maxUEdgeId() const { return edges.size() / 2 - 1; } |
---|
| 811 | int maxEdgeId() const { return edges.size()-1; } |
---|
| 812 | |
---|
| 813 | Node source(Edge e) const { return Node(edges[e.id ^ 1].target); } |
---|
| 814 | Node target(Edge e) const { return Node(edges[e.id].target); } |
---|
| 815 | |
---|
| 816 | Node source(UEdge e) const { return Node(edges[2 * e.id].target); } |
---|
| 817 | Node target(UEdge e) const { return Node(edges[2 * e.id + 1].target); } |
---|
| 818 | |
---|
| 819 | static bool direction(Edge e) { |
---|
| 820 | return (e.id & 1) == 1; |
---|
| 821 | } |
---|
| 822 | |
---|
| 823 | static Edge direct(UEdge e, bool d) { |
---|
| 824 | return Edge(e.id * 2 + (d ? 1 : 0)); |
---|
| 825 | } |
---|
| 826 | |
---|
| 827 | void first(Node& node) const { |
---|
| 828 | node.id = first_node; |
---|
| 829 | } |
---|
| 830 | |
---|
| 831 | void next(Node& node) const { |
---|
| 832 | node.id = nodes[node.id].next; |
---|
| 833 | } |
---|
| 834 | |
---|
| 835 | void first(Edge& e) const { |
---|
| 836 | int n = first_node; |
---|
| 837 | while (n != -1 && nodes[n].first_out == -1) { |
---|
| 838 | n = nodes[n].next; |
---|
| 839 | } |
---|
| 840 | e.id = (n == -1) ? -1 : nodes[n].first_out; |
---|
| 841 | } |
---|
| 842 | |
---|
| 843 | void next(Edge& e) const { |
---|
| 844 | if (edges[e.id].next_out != -1) { |
---|
| 845 | e.id = edges[e.id].next_out; |
---|
| 846 | } else { |
---|
| 847 | int n = nodes[edges[e.id ^ 1].target].next; |
---|
| 848 | while(n != -1 && nodes[n].first_out == -1) { |
---|
| 849 | n = nodes[n].next; |
---|
| 850 | } |
---|
| 851 | e.id = (n == -1) ? -1 : nodes[n].first_out; |
---|
| 852 | } |
---|
| 853 | } |
---|
| 854 | |
---|
| 855 | void first(UEdge& e) const { |
---|
| 856 | int n = first_node; |
---|
| 857 | while (n != -1) { |
---|
| 858 | e.id = nodes[n].first_out; |
---|
| 859 | while ((e.id & 1) != 1) { |
---|
| 860 | e.id = edges[e.id].next_out; |
---|
| 861 | } |
---|
| 862 | if (e.id != -1) { |
---|
| 863 | e.id /= 2; |
---|
| 864 | return; |
---|
| 865 | } |
---|
| 866 | n = nodes[n].next; |
---|
| 867 | } |
---|
| 868 | e.id = -1; |
---|
| 869 | } |
---|
| 870 | |
---|
| 871 | void next(UEdge& e) const { |
---|
| 872 | int n = edges[e.id * 2].target; |
---|
| 873 | e.id = edges[(e.id * 2) | 1].next_out; |
---|
| 874 | while ((e.id & 1) != 1) { |
---|
| 875 | e.id = edges[e.id].next_out; |
---|
| 876 | } |
---|
| 877 | if (e.id != -1) { |
---|
| 878 | e.id /= 2; |
---|
| 879 | return; |
---|
| 880 | } |
---|
| 881 | n = nodes[n].next; |
---|
| 882 | while (n != -1) { |
---|
| 883 | e.id = nodes[n].first_out; |
---|
| 884 | while ((e.id & 1) != 1) { |
---|
| 885 | e.id = edges[e.id].next_out; |
---|
| 886 | } |
---|
| 887 | if (e.id != -1) { |
---|
| 888 | e.id /= 2; |
---|
| 889 | return; |
---|
| 890 | } |
---|
| 891 | n = nodes[n].next; |
---|
| 892 | } |
---|
| 893 | e.id = -1; |
---|
| 894 | } |
---|
| 895 | |
---|
| 896 | void firstOut(Edge &e, const Node& v) const { |
---|
| 897 | e.id = nodes[v.id].first_out; |
---|
| 898 | } |
---|
| 899 | void nextOut(Edge &e) const { |
---|
| 900 | e.id = edges[e.id].next_out; |
---|
| 901 | } |
---|
| 902 | |
---|
| 903 | void firstIn(Edge &e, const Node& v) const { |
---|
| 904 | e.id = ((nodes[v.id].first_out) ^ 1); |
---|
| 905 | if (e.id == -2) e.id = -1; |
---|
| 906 | } |
---|
| 907 | void nextIn(Edge &e) const { |
---|
| 908 | e.id = ((edges[e.id ^ 1].next_out) ^ 1); |
---|
| 909 | if (e.id == -2) e.id = -1; |
---|
| 910 | } |
---|
| 911 | |
---|
| 912 | void firstInc(UEdge &e, bool& d, const Node& v) const { |
---|
| 913 | int de = nodes[v.id].first_out; |
---|
[2381] | 914 | if (de != -1 ) { |
---|
| 915 | e.id = de / 2; |
---|
| 916 | d = ((de & 1) == 1); |
---|
| 917 | } else { |
---|
| 918 | e.id = -1; |
---|
| 919 | d = true; |
---|
| 920 | } |
---|
[2338] | 921 | } |
---|
| 922 | void nextInc(UEdge &e, bool& d) const { |
---|
| 923 | int de = (edges[(e.id * 2) | (d ? 1 : 0)].next_out); |
---|
[2381] | 924 | if (de != -1 ) { |
---|
| 925 | e.id = de / 2; |
---|
| 926 | d = ((de & 1) == 1); |
---|
| 927 | } else { |
---|
| 928 | e.id = -1; |
---|
| 929 | d = true; |
---|
| 930 | } |
---|
[2338] | 931 | } |
---|
| 932 | |
---|
| 933 | static int id(Node v) { return v.id; } |
---|
| 934 | static int id(Edge e) { return e.id; } |
---|
| 935 | static int id(UEdge e) { return e.id; } |
---|
| 936 | |
---|
| 937 | static Node nodeFromId(int id) { return Node(id);} |
---|
| 938 | static Edge edgeFromId(int id) { return Edge(id);} |
---|
| 939 | static UEdge uEdgeFromId(int id) { return UEdge(id);} |
---|
| 940 | |
---|
| 941 | Node addNode() { |
---|
| 942 | int n; |
---|
| 943 | |
---|
| 944 | if(first_free_node==-1) { |
---|
| 945 | n = nodes.size(); |
---|
| 946 | nodes.push_back(NodeT()); |
---|
| 947 | } else { |
---|
| 948 | n = first_free_node; |
---|
| 949 | first_free_node = nodes[n].next; |
---|
| 950 | } |
---|
| 951 | |
---|
| 952 | nodes[n].next = first_node; |
---|
| 953 | if (first_node != -1) nodes[first_node].prev = n; |
---|
| 954 | first_node = n; |
---|
| 955 | nodes[n].prev = -1; |
---|
| 956 | |
---|
| 957 | nodes[n].first_out = -1; |
---|
| 958 | |
---|
| 959 | return Node(n); |
---|
| 960 | } |
---|
| 961 | |
---|
| 962 | UEdge addEdge(Node u, Node v) { |
---|
| 963 | int n; |
---|
| 964 | |
---|
| 965 | if (first_free_edge == -1) { |
---|
| 966 | n = edges.size(); |
---|
| 967 | edges.push_back(EdgeT()); |
---|
| 968 | edges.push_back(EdgeT()); |
---|
| 969 | } else { |
---|
| 970 | n = first_free_edge; |
---|
| 971 | first_free_edge = edges[n].next_out; |
---|
| 972 | } |
---|
| 973 | |
---|
| 974 | edges[n].target = u.id; |
---|
| 975 | edges[n | 1].target = v.id; |
---|
| 976 | |
---|
| 977 | edges[n].next_out = nodes[v.id].first_out; |
---|
| 978 | edges[n | 1].next_out = nodes[u.id].first_out; |
---|
| 979 | if (nodes[v.id].first_out != -1) { |
---|
| 980 | edges[nodes[v.id].first_out].prev_out = n; |
---|
| 981 | } |
---|
| 982 | if (nodes[u.id].first_out != -1) { |
---|
| 983 | edges[nodes[u.id].first_out].prev_out = (n | 1); |
---|
| 984 | } |
---|
| 985 | |
---|
| 986 | edges[n].prev_out = edges[n | 1].prev_out = -1; |
---|
| 987 | |
---|
| 988 | nodes[v.id].first_out = n; |
---|
| 989 | nodes[u.id].first_out = (n | 1); |
---|
| 990 | |
---|
| 991 | return UEdge(n / 2); |
---|
| 992 | } |
---|
| 993 | |
---|
| 994 | void erase(const Node& node) { |
---|
| 995 | int n = node.id; |
---|
| 996 | |
---|
| 997 | if(nodes[n].next != -1) { |
---|
| 998 | nodes[nodes[n].next].prev = nodes[n].prev; |
---|
| 999 | } |
---|
| 1000 | |
---|
| 1001 | if(nodes[n].prev != -1) { |
---|
| 1002 | nodes[nodes[n].prev].next = nodes[n].next; |
---|
| 1003 | } else { |
---|
| 1004 | first_node = nodes[n].next; |
---|
| 1005 | } |
---|
| 1006 | |
---|
| 1007 | nodes[n].next = first_free_node; |
---|
| 1008 | first_free_node = n; |
---|
| 1009 | |
---|
| 1010 | } |
---|
| 1011 | |
---|
| 1012 | void erase(const UEdge& edge) { |
---|
| 1013 | int n = edge.id * 2; |
---|
| 1014 | |
---|
| 1015 | if (edges[n].next_out != -1) { |
---|
| 1016 | edges[edges[n].next_out].prev_out = edges[n].prev_out; |
---|
| 1017 | } |
---|
| 1018 | |
---|
| 1019 | if (edges[n].prev_out != -1) { |
---|
| 1020 | edges[edges[n].prev_out].next_out = edges[n].next_out; |
---|
| 1021 | } else { |
---|
| 1022 | nodes[edges[n | 1].target].first_out = edges[n].next_out; |
---|
| 1023 | } |
---|
| 1024 | |
---|
| 1025 | if (edges[n | 1].next_out != -1) { |
---|
| 1026 | edges[edges[n | 1].next_out].prev_out = edges[n | 1].prev_out; |
---|
| 1027 | } |
---|
| 1028 | |
---|
| 1029 | if (edges[n | 1].prev_out != -1) { |
---|
| 1030 | edges[edges[n | 1].prev_out].next_out = edges[n | 1].next_out; |
---|
| 1031 | } else { |
---|
| 1032 | nodes[edges[n].target].first_out = edges[n | 1].next_out; |
---|
| 1033 | } |
---|
| 1034 | |
---|
| 1035 | edges[n].next_out = first_free_edge; |
---|
| 1036 | first_free_edge = n; |
---|
| 1037 | |
---|
| 1038 | } |
---|
| 1039 | |
---|
| 1040 | void clear() { |
---|
| 1041 | edges.clear(); |
---|
| 1042 | nodes.clear(); |
---|
| 1043 | first_node = first_free_node = first_free_edge = -1; |
---|
| 1044 | } |
---|
| 1045 | |
---|
| 1046 | protected: |
---|
| 1047 | |
---|
| 1048 | void changeTarget(UEdge e, Node n) { |
---|
| 1049 | if(edges[2 * e.id].next_out != -1) { |
---|
| 1050 | edges[edges[2 * e.id].next_out].prev_out = edges[2 * e.id].prev_out; |
---|
| 1051 | } |
---|
| 1052 | if(edges[2 * e.id].prev_out != -1) { |
---|
| 1053 | edges[edges[2 * e.id].prev_out].next_out = |
---|
| 1054 | edges[2 * e.id].next_out; |
---|
| 1055 | } else { |
---|
| 1056 | nodes[edges[(2 * e.id) | 1].target].first_out = |
---|
| 1057 | edges[2 * e.id].next_out; |
---|
| 1058 | } |
---|
| 1059 | |
---|
| 1060 | if (nodes[n.id].first_out != -1) { |
---|
| 1061 | edges[nodes[n.id].first_out].prev_out = 2 * e.id; |
---|
| 1062 | } |
---|
| 1063 | edges[(2 * e.id) | 1].target = n.id; |
---|
| 1064 | edges[2 * e.id].prev_out = -1; |
---|
| 1065 | edges[2 * e.id].next_out = nodes[n.id].first_out; |
---|
| 1066 | nodes[n.id].first_out = 2 * e.id; |
---|
| 1067 | } |
---|
| 1068 | |
---|
| 1069 | void changeSource(UEdge e, Node n) { |
---|
| 1070 | if(edges[(2 * e.id) | 1].next_out != -1) { |
---|
| 1071 | edges[edges[(2 * e.id) | 1].next_out].prev_out = |
---|
| 1072 | edges[(2 * e.id) | 1].prev_out; |
---|
| 1073 | } |
---|
| 1074 | if(edges[(2 * e.id) | 1].prev_out != -1) { |
---|
| 1075 | edges[edges[(2 * e.id) | 1].prev_out].next_out = |
---|
| 1076 | edges[(2 * e.id) | 1].next_out; |
---|
| 1077 | } else { |
---|
| 1078 | nodes[edges[2 * e.id].target].first_out = |
---|
| 1079 | edges[(2 * e.id) | 1].next_out; |
---|
| 1080 | } |
---|
| 1081 | |
---|
| 1082 | if (nodes[n.id].first_out != -1) { |
---|
| 1083 | edges[nodes[n.id].first_out].prev_out = ((2 * e.id) | 1); |
---|
| 1084 | } |
---|
| 1085 | edges[2 * e.id].target = n.id; |
---|
| 1086 | edges[(2 * e.id) | 1].prev_out = -1; |
---|
| 1087 | edges[(2 * e.id) | 1].next_out = nodes[n.id].first_out; |
---|
| 1088 | nodes[n.id].first_out = ((2 * e.id) | 1); |
---|
| 1089 | } |
---|
| 1090 | |
---|
| 1091 | }; |
---|
| 1092 | |
---|
| 1093 | // typedef UGraphExtender<UndirGraphExtender<ListGraphBase> > |
---|
| 1094 | // ExtendedListUGraphBase; |
---|
| 1095 | |
---|
| 1096 | typedef UGraphExtender<ListUGraphBase> ExtendedListUGraphBase; |
---|
| 1097 | |
---|
| 1098 | |
---|
[2116] | 1099 | |
---|
| 1100 | /// \addtogroup graphs |
---|
| 1101 | /// @{ |
---|
| 1102 | |
---|
| 1103 | ///An undirected list graph class. |
---|
| 1104 | |
---|
[2117] | 1105 | ///This is a simple and fast undirected graph implementation. |
---|
[2116] | 1106 | /// |
---|
[2256] | 1107 | ///An important extra feature of this graph implementation is that |
---|
[2260] | 1108 | ///its maps are real \ref concepts::ReferenceMap "reference map"s. |
---|
[2256] | 1109 | /// |
---|
[2116] | 1110 | ///It conforms to the |
---|
[2260] | 1111 | ///\ref concepts::UGraph "UGraph concept". |
---|
[2116] | 1112 | /// |
---|
[2260] | 1113 | ///\sa concepts::UGraph. |
---|
[2116] | 1114 | /// |
---|
| 1115 | class ListUGraph : public ExtendedListUGraphBase { |
---|
[2128] | 1116 | private: |
---|
| 1117 | ///ListUGraph is \e not copy constructible. Use UGraphCopy() instead. |
---|
| 1118 | |
---|
| 1119 | ///ListUGraph is \e not copy constructible. Use UGraphCopy() instead. |
---|
| 1120 | /// |
---|
| 1121 | ListUGraph(const ListUGraph &) :ExtendedListUGraphBase() {}; |
---|
[2132] | 1122 | ///\brief Assignment of ListUGraph to another one is \e not allowed. |
---|
[2128] | 1123 | ///Use UGraphCopy() instead. |
---|
| 1124 | |
---|
[2132] | 1125 | ///Assignment of ListUGraph to another one is \e not allowed. |
---|
[2128] | 1126 | ///Use UGraphCopy() instead. |
---|
| 1127 | void operator=(const ListUGraph &) {} |
---|
[2116] | 1128 | public: |
---|
[2128] | 1129 | /// Constructor |
---|
| 1130 | |
---|
| 1131 | /// Constructor. |
---|
| 1132 | /// |
---|
| 1133 | ListUGraph() {} |
---|
| 1134 | |
---|
[2116] | 1135 | typedef ExtendedListUGraphBase Parent; |
---|
[2338] | 1136 | |
---|
| 1137 | typedef Parent::OutEdgeIt IncEdgeIt; |
---|
| 1138 | |
---|
[2116] | 1139 | /// \brief Add a new node to the graph. |
---|
| 1140 | /// |
---|
| 1141 | /// \return the new node. |
---|
| 1142 | /// |
---|
| 1143 | Node addNode() { return Parent::addNode(); } |
---|
| 1144 | |
---|
| 1145 | /// \brief Add a new edge to the graph. |
---|
| 1146 | /// |
---|
| 1147 | /// Add a new edge to the graph with source node \c s |
---|
| 1148 | /// and target node \c t. |
---|
| 1149 | /// \return the new undirected edge. |
---|
| 1150 | UEdge addEdge(const Node& s, const Node& t) { |
---|
| 1151 | return Parent::addEdge(s, t); |
---|
| 1152 | } |
---|
[2160] | 1153 | /// \brief Changes the source of \c e to \c n |
---|
| 1154 | /// |
---|
| 1155 | /// Changes the source of \c e to \c n |
---|
| 1156 | /// |
---|
| 1157 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
| 1158 | ///referencing the changed edge remain |
---|
| 1159 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 1160 | void changeSource(UEdge e, Node n) { |
---|
| 1161 | Parent::changeSource(e,n); |
---|
| 1162 | } |
---|
[2116] | 1163 | /// \brief Changes the target of \c e to \c n |
---|
| 1164 | /// |
---|
| 1165 | /// Changes the target of \c e to \c n |
---|
| 1166 | /// |
---|
[2160] | 1167 | /// \note The <tt>EdgeIt</tt>s referencing the changed edge remain |
---|
| 1168 | /// valid. However the other iterators may be invalidated. |
---|
[2116] | 1169 | void changeTarget(UEdge e, Node n) { |
---|
| 1170 | Parent::changeTarget(e,n); |
---|
| 1171 | } |
---|
[2160] | 1172 | /// \brief Changes the source of \c e to \c n |
---|
[2116] | 1173 | /// |
---|
[2160] | 1174 | /// Changes the source of \c e to \c n. It changes the proper |
---|
| 1175 | /// node of the represented undirected edge. |
---|
[2116] | 1176 | /// |
---|
[2160] | 1177 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
[2116] | 1178 | ///referencing the changed edge remain |
---|
[2160] | 1179 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 1180 | void changeSource(Edge e, Node n) { |
---|
| 1181 | if (Parent::direction(e)) { |
---|
| 1182 | Parent::changeSource(e,n); |
---|
| 1183 | } else { |
---|
| 1184 | Parent::changeTarget(e,n); |
---|
| 1185 | } |
---|
| 1186 | } |
---|
| 1187 | /// \brief Changes the target of \c e to \c n |
---|
| 1188 | /// |
---|
| 1189 | /// Changes the target of \c e to \c n. It changes the proper |
---|
| 1190 | /// node of the represented undirected edge. |
---|
| 1191 | /// |
---|
| 1192 | ///\note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1193 | ///referencing the changed edge remain |
---|
| 1194 | ///valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1195 | void changeTarget(Edge e, Node n) { |
---|
| 1196 | if (Parent::direction(e)) { |
---|
| 1197 | Parent::changeTarget(e,n); |
---|
| 1198 | } else { |
---|
| 1199 | Parent::changeSource(e,n); |
---|
| 1200 | } |
---|
[2116] | 1201 | } |
---|
| 1202 | /// \brief Contract two nodes. |
---|
| 1203 | /// |
---|
| 1204 | /// This function contracts two nodes. |
---|
| 1205 | /// |
---|
| 1206 | /// Node \p b will be removed but instead of deleting |
---|
| 1207 | /// its neighboring edges, they will be joined to \p a. |
---|
| 1208 | /// The last parameter \p r controls whether to remove loops. \c true |
---|
| 1209 | /// means that loops will be removed. |
---|
| 1210 | /// |
---|
[2160] | 1211 | /// \note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
[2116] | 1212 | /// valid. |
---|
| 1213 | void contract(Node a, Node b, bool r = true) { |
---|
| 1214 | for(IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 1215 | IncEdgeIt f = e; ++f; |
---|
| 1216 | if (r && runningNode(e) == a) { |
---|
| 1217 | erase(e); |
---|
| 1218 | } else if (source(e) == b) { |
---|
| 1219 | changeSource(e, a); |
---|
| 1220 | } else { |
---|
| 1221 | changeTarget(e, a); |
---|
| 1222 | } |
---|
| 1223 | e = f; |
---|
| 1224 | } |
---|
| 1225 | erase(b); |
---|
| 1226 | } |
---|
[2189] | 1227 | |
---|
| 1228 | |
---|
| 1229 | /// \brief Class to make a snapshot of the graph and restore |
---|
| 1230 | /// to it later. |
---|
| 1231 | /// |
---|
| 1232 | /// Class to make a snapshot of the graph and to restore it |
---|
| 1233 | /// later. |
---|
| 1234 | /// |
---|
| 1235 | /// The newly added nodes and undirected edges can be removed |
---|
| 1236 | /// using the restore() function. |
---|
| 1237 | /// |
---|
| 1238 | /// \warning Edge and node deletions cannot be restored. This |
---|
| 1239 | /// events invalidate the snapshot. |
---|
| 1240 | class Snapshot { |
---|
| 1241 | protected: |
---|
| 1242 | |
---|
| 1243 | typedef Parent::NodeNotifier NodeNotifier; |
---|
| 1244 | |
---|
| 1245 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
| 1246 | public: |
---|
| 1247 | |
---|
| 1248 | NodeObserverProxy(Snapshot& _snapshot) |
---|
| 1249 | : snapshot(_snapshot) {} |
---|
| 1250 | |
---|
| 1251 | using NodeNotifier::ObserverBase::attach; |
---|
| 1252 | using NodeNotifier::ObserverBase::detach; |
---|
| 1253 | using NodeNotifier::ObserverBase::attached; |
---|
| 1254 | |
---|
| 1255 | protected: |
---|
| 1256 | |
---|
| 1257 | virtual void add(const Node& node) { |
---|
| 1258 | snapshot.addNode(node); |
---|
| 1259 | } |
---|
| 1260 | virtual void add(const std::vector<Node>& nodes) { |
---|
| 1261 | for (int i = nodes.size() - 1; i >= 0; ++i) { |
---|
| 1262 | snapshot.addNode(nodes[i]); |
---|
| 1263 | } |
---|
| 1264 | } |
---|
| 1265 | virtual void erase(const Node& node) { |
---|
| 1266 | snapshot.eraseNode(node); |
---|
| 1267 | } |
---|
| 1268 | virtual void erase(const std::vector<Node>& nodes) { |
---|
[2386] | 1269 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
[2189] | 1270 | snapshot.eraseNode(nodes[i]); |
---|
| 1271 | } |
---|
| 1272 | } |
---|
| 1273 | virtual void build() { |
---|
| 1274 | Node node; |
---|
| 1275 | std::vector<Node> nodes; |
---|
[2386] | 1276 | for (notifier()->first(node); node != INVALID; |
---|
| 1277 | notifier()->next(node)) { |
---|
[2189] | 1278 | nodes.push_back(node); |
---|
| 1279 | } |
---|
| 1280 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
| 1281 | snapshot.addNode(nodes[i]); |
---|
| 1282 | } |
---|
| 1283 | } |
---|
| 1284 | virtual void clear() { |
---|
| 1285 | Node node; |
---|
[2386] | 1286 | for (notifier()->first(node); node != INVALID; |
---|
| 1287 | notifier()->next(node)) { |
---|
[2189] | 1288 | snapshot.eraseNode(node); |
---|
| 1289 | } |
---|
| 1290 | } |
---|
| 1291 | |
---|
| 1292 | Snapshot& snapshot; |
---|
| 1293 | }; |
---|
| 1294 | |
---|
| 1295 | class UEdgeObserverProxy : public UEdgeNotifier::ObserverBase { |
---|
| 1296 | public: |
---|
| 1297 | |
---|
| 1298 | UEdgeObserverProxy(Snapshot& _snapshot) |
---|
| 1299 | : snapshot(_snapshot) {} |
---|
| 1300 | |
---|
| 1301 | using UEdgeNotifier::ObserverBase::attach; |
---|
| 1302 | using UEdgeNotifier::ObserverBase::detach; |
---|
| 1303 | using UEdgeNotifier::ObserverBase::attached; |
---|
| 1304 | |
---|
| 1305 | protected: |
---|
| 1306 | |
---|
| 1307 | virtual void add(const UEdge& edge) { |
---|
| 1308 | snapshot.addUEdge(edge); |
---|
| 1309 | } |
---|
| 1310 | virtual void add(const std::vector<UEdge>& edges) { |
---|
| 1311 | for (int i = edges.size() - 1; i >= 0; ++i) { |
---|
| 1312 | snapshot.addUEdge(edges[i]); |
---|
| 1313 | } |
---|
| 1314 | } |
---|
| 1315 | virtual void erase(const UEdge& edge) { |
---|
| 1316 | snapshot.eraseUEdge(edge); |
---|
| 1317 | } |
---|
| 1318 | virtual void erase(const std::vector<UEdge>& edges) { |
---|
[2386] | 1319 | for (int i = 0; i < int(edges.size()); ++i) { |
---|
[2189] | 1320 | snapshot.eraseUEdge(edges[i]); |
---|
| 1321 | } |
---|
| 1322 | } |
---|
| 1323 | virtual void build() { |
---|
| 1324 | UEdge edge; |
---|
| 1325 | std::vector<UEdge> edges; |
---|
[2386] | 1326 | for (notifier()->first(edge); edge != INVALID; |
---|
| 1327 | notifier()->next(edge)) { |
---|
[2189] | 1328 | edges.push_back(edge); |
---|
| 1329 | } |
---|
| 1330 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
| 1331 | snapshot.addUEdge(edges[i]); |
---|
| 1332 | } |
---|
| 1333 | } |
---|
| 1334 | virtual void clear() { |
---|
| 1335 | UEdge edge; |
---|
[2386] | 1336 | for (notifier()->first(edge); edge != INVALID; |
---|
| 1337 | notifier()->next(edge)) { |
---|
[2189] | 1338 | snapshot.eraseUEdge(edge); |
---|
| 1339 | } |
---|
| 1340 | } |
---|
| 1341 | |
---|
| 1342 | Snapshot& snapshot; |
---|
| 1343 | }; |
---|
| 1344 | |
---|
| 1345 | ListUGraph *graph; |
---|
| 1346 | |
---|
| 1347 | NodeObserverProxy node_observer_proxy; |
---|
| 1348 | UEdgeObserverProxy edge_observer_proxy; |
---|
| 1349 | |
---|
| 1350 | std::list<Node> added_nodes; |
---|
| 1351 | std::list<UEdge> added_edges; |
---|
| 1352 | |
---|
| 1353 | |
---|
| 1354 | void addNode(const Node& node) { |
---|
| 1355 | added_nodes.push_front(node); |
---|
| 1356 | } |
---|
| 1357 | void eraseNode(const Node& node) { |
---|
| 1358 | std::list<Node>::iterator it = |
---|
| 1359 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
| 1360 | if (it == added_nodes.end()) { |
---|
| 1361 | clear(); |
---|
| 1362 | edge_observer_proxy.detach(); |
---|
| 1363 | throw NodeNotifier::ImmediateDetach(); |
---|
| 1364 | } else { |
---|
| 1365 | added_nodes.erase(it); |
---|
| 1366 | } |
---|
| 1367 | } |
---|
| 1368 | |
---|
| 1369 | void addUEdge(const UEdge& edge) { |
---|
| 1370 | added_edges.push_front(edge); |
---|
| 1371 | } |
---|
| 1372 | void eraseUEdge(const UEdge& edge) { |
---|
| 1373 | std::list<UEdge>::iterator it = |
---|
| 1374 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
| 1375 | if (it == added_edges.end()) { |
---|
| 1376 | clear(); |
---|
| 1377 | node_observer_proxy.detach(); |
---|
| 1378 | throw UEdgeNotifier::ImmediateDetach(); |
---|
| 1379 | } else { |
---|
| 1380 | added_edges.erase(it); |
---|
| 1381 | } |
---|
| 1382 | } |
---|
| 1383 | |
---|
| 1384 | void attach(ListUGraph &_graph) { |
---|
| 1385 | graph = &_graph; |
---|
[2381] | 1386 | node_observer_proxy.attach(graph->notifier(Node())); |
---|
| 1387 | edge_observer_proxy.attach(graph->notifier(UEdge())); |
---|
[2189] | 1388 | } |
---|
| 1389 | |
---|
| 1390 | void detach() { |
---|
| 1391 | node_observer_proxy.detach(); |
---|
| 1392 | edge_observer_proxy.detach(); |
---|
| 1393 | } |
---|
| 1394 | |
---|
| 1395 | bool attached() const { |
---|
| 1396 | return node_observer_proxy.attached(); |
---|
| 1397 | } |
---|
| 1398 | |
---|
| 1399 | void clear() { |
---|
| 1400 | added_nodes.clear(); |
---|
| 1401 | added_edges.clear(); |
---|
| 1402 | } |
---|
| 1403 | |
---|
| 1404 | public: |
---|
| 1405 | |
---|
| 1406 | /// \brief Default constructor. |
---|
| 1407 | /// |
---|
| 1408 | /// Default constructor. |
---|
| 1409 | /// To actually make a snapshot you must call save(). |
---|
| 1410 | Snapshot() |
---|
| 1411 | : graph(0), node_observer_proxy(*this), |
---|
| 1412 | edge_observer_proxy(*this) {} |
---|
| 1413 | |
---|
| 1414 | /// \brief Constructor that immediately makes a snapshot. |
---|
| 1415 | /// |
---|
| 1416 | /// This constructor immediately makes a snapshot of the graph. |
---|
| 1417 | /// \param _graph The graph we make a snapshot of. |
---|
| 1418 | Snapshot(ListUGraph &_graph) |
---|
| 1419 | : node_observer_proxy(*this), |
---|
| 1420 | edge_observer_proxy(*this) { |
---|
| 1421 | attach(_graph); |
---|
| 1422 | } |
---|
| 1423 | |
---|
| 1424 | /// \brief Make a snapshot. |
---|
| 1425 | /// |
---|
| 1426 | /// Make a snapshot of the graph. |
---|
| 1427 | /// |
---|
| 1428 | /// This function can be called more than once. In case of a repeated |
---|
| 1429 | /// call, the previous snapshot gets lost. |
---|
| 1430 | /// \param _graph The graph we make the snapshot of. |
---|
| 1431 | void save(ListUGraph &_graph) { |
---|
| 1432 | if (attached()) { |
---|
| 1433 | detach(); |
---|
| 1434 | clear(); |
---|
| 1435 | } |
---|
| 1436 | attach(_graph); |
---|
| 1437 | } |
---|
| 1438 | |
---|
| 1439 | /// \brief Undo the changes until the last snapshot. |
---|
| 1440 | // |
---|
| 1441 | /// Undo the changes until the last snapshot created by save(). |
---|
| 1442 | void restore() { |
---|
| 1443 | detach(); |
---|
| 1444 | for(std::list<UEdge>::iterator it = added_edges.begin(); |
---|
| 1445 | it != added_edges.end(); ++it) { |
---|
| 1446 | graph->erase(*it); |
---|
| 1447 | } |
---|
| 1448 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
| 1449 | it != added_nodes.end(); ++it) { |
---|
| 1450 | graph->erase(*it); |
---|
| 1451 | } |
---|
| 1452 | clear(); |
---|
| 1453 | } |
---|
| 1454 | |
---|
| 1455 | /// \brief Gives back true when the snapshot is valid. |
---|
| 1456 | /// |
---|
| 1457 | /// Gives back true when the snapshot is valid. |
---|
| 1458 | bool valid() const { |
---|
| 1459 | return attached(); |
---|
| 1460 | } |
---|
| 1461 | }; |
---|
[2116] | 1462 | }; |
---|
| 1463 | |
---|
| 1464 | |
---|
| 1465 | class ListBpUGraphBase { |
---|
| 1466 | public: |
---|
| 1467 | |
---|
| 1468 | class NodeSetError : public LogicError { |
---|
[2160] | 1469 | public: |
---|
[2151] | 1470 | virtual const char* what() const throw() { |
---|
[2116] | 1471 | return "lemon::ListBpUGraph::NodeSetError"; |
---|
| 1472 | } |
---|
| 1473 | }; |
---|
| 1474 | |
---|
| 1475 | protected: |
---|
| 1476 | |
---|
| 1477 | struct NodeT { |
---|
| 1478 | int first_edge, prev, next; |
---|
| 1479 | }; |
---|
| 1480 | |
---|
| 1481 | struct UEdgeT { |
---|
| 1482 | int aNode, prev_out, next_out; |
---|
| 1483 | int bNode, prev_in, next_in; |
---|
| 1484 | }; |
---|
| 1485 | |
---|
| 1486 | std::vector<NodeT> aNodes; |
---|
| 1487 | std::vector<NodeT> bNodes; |
---|
| 1488 | |
---|
| 1489 | std::vector<UEdgeT> edges; |
---|
| 1490 | |
---|
| 1491 | int first_anode; |
---|
| 1492 | int first_free_anode; |
---|
| 1493 | |
---|
| 1494 | int first_bnode; |
---|
| 1495 | int first_free_bnode; |
---|
| 1496 | |
---|
| 1497 | int first_free_edge; |
---|
| 1498 | |
---|
| 1499 | public: |
---|
| 1500 | |
---|
| 1501 | class Node { |
---|
| 1502 | friend class ListBpUGraphBase; |
---|
| 1503 | protected: |
---|
| 1504 | int id; |
---|
| 1505 | |
---|
| 1506 | explicit Node(int _id) : id(_id) {} |
---|
| 1507 | public: |
---|
| 1508 | Node() {} |
---|
| 1509 | Node(Invalid) { id = -1; } |
---|
| 1510 | bool operator==(const Node i) const {return id==i.id;} |
---|
| 1511 | bool operator!=(const Node i) const {return id!=i.id;} |
---|
| 1512 | bool operator<(const Node i) const {return id<i.id;} |
---|
| 1513 | }; |
---|
| 1514 | |
---|
| 1515 | class UEdge { |
---|
| 1516 | friend class ListBpUGraphBase; |
---|
| 1517 | protected: |
---|
| 1518 | int id; |
---|
| 1519 | |
---|
| 1520 | explicit UEdge(int _id) { id = _id;} |
---|
| 1521 | public: |
---|
| 1522 | UEdge() {} |
---|
| 1523 | UEdge (Invalid) { id = -1; } |
---|
| 1524 | bool operator==(const UEdge i) const {return id==i.id;} |
---|
| 1525 | bool operator!=(const UEdge i) const {return id!=i.id;} |
---|
| 1526 | bool operator<(const UEdge i) const {return id<i.id;} |
---|
| 1527 | }; |
---|
| 1528 | |
---|
| 1529 | ListBpUGraphBase() |
---|
| 1530 | : first_anode(-1), first_free_anode(-1), |
---|
| 1531 | first_bnode(-1), first_free_bnode(-1), |
---|
| 1532 | first_free_edge(-1) {} |
---|
| 1533 | |
---|
| 1534 | void firstANode(Node& node) const { |
---|
| 1535 | node.id = first_anode != -1 ? (first_anode << 1) : -1; |
---|
| 1536 | } |
---|
| 1537 | void nextANode(Node& node) const { |
---|
| 1538 | node.id = aNodes[node.id >> 1].next; |
---|
| 1539 | } |
---|
| 1540 | |
---|
| 1541 | void firstBNode(Node& node) const { |
---|
| 1542 | node.id = first_bnode != -1 ? (first_bnode << 1) + 1 : -1; |
---|
| 1543 | } |
---|
| 1544 | void nextBNode(Node& node) const { |
---|
| 1545 | node.id = bNodes[node.id >> 1].next; |
---|
| 1546 | } |
---|
| 1547 | |
---|
| 1548 | void first(Node& node) const { |
---|
| 1549 | if (first_anode != -1) { |
---|
| 1550 | node.id = (first_anode << 1); |
---|
| 1551 | } else if (first_bnode != -1) { |
---|
| 1552 | node.id = (first_bnode << 1) + 1; |
---|
| 1553 | } else { |
---|
| 1554 | node.id = -1; |
---|
| 1555 | } |
---|
| 1556 | } |
---|
| 1557 | void next(Node& node) const { |
---|
| 1558 | if (aNode(node)) { |
---|
| 1559 | node.id = aNodes[node.id >> 1].next; |
---|
| 1560 | if (node.id == -1) { |
---|
| 1561 | if (first_bnode != -1) { |
---|
| 1562 | node.id = (first_bnode << 1) + 1; |
---|
| 1563 | } |
---|
| 1564 | } |
---|
| 1565 | } else { |
---|
| 1566 | node.id = bNodes[node.id >> 1].next; |
---|
| 1567 | } |
---|
| 1568 | } |
---|
| 1569 | |
---|
| 1570 | void first(UEdge& edge) const { |
---|
[2386] | 1571 | int aid = first_anode; |
---|
| 1572 | while (aid != -1 && aNodes[aid].first_edge == -1) { |
---|
| 1573 | aid = aNodes[aid].next != -1 ? |
---|
| 1574 | aNodes[aid].next >> 1 : -1; |
---|
[2116] | 1575 | } |
---|
[2386] | 1576 | if (aid != -1) { |
---|
| 1577 | edge.id = aNodes[aid].first_edge; |
---|
[2116] | 1578 | } else { |
---|
| 1579 | edge.id = -1; |
---|
| 1580 | } |
---|
| 1581 | } |
---|
| 1582 | void next(UEdge& edge) const { |
---|
[2386] | 1583 | int aid = edges[edge.id].aNode >> 1; |
---|
[2116] | 1584 | edge.id = edges[edge.id].next_out; |
---|
| 1585 | if (edge.id == -1) { |
---|
[2386] | 1586 | aid = aNodes[aid].next != -1 ? |
---|
| 1587 | aNodes[aid].next >> 1 : -1; |
---|
| 1588 | while (aid != -1 && aNodes[aid].first_edge == -1) { |
---|
| 1589 | aid = aNodes[aid].next != -1 ? |
---|
| 1590 | aNodes[aid].next >> 1 : -1; |
---|
[2116] | 1591 | } |
---|
[2386] | 1592 | if (aid != -1) { |
---|
| 1593 | edge.id = aNodes[aid].first_edge; |
---|
[2116] | 1594 | } else { |
---|
| 1595 | edge.id = -1; |
---|
| 1596 | } |
---|
| 1597 | } |
---|
| 1598 | } |
---|
| 1599 | |
---|
| 1600 | void firstFromANode(UEdge& edge, const Node& node) const { |
---|
| 1601 | LEMON_ASSERT((node.id & 1) == 0, NodeSetError()); |
---|
| 1602 | edge.id = aNodes[node.id >> 1].first_edge; |
---|
| 1603 | } |
---|
| 1604 | void nextFromANode(UEdge& edge) const { |
---|
| 1605 | edge.id = edges[edge.id].next_out; |
---|
| 1606 | } |
---|
| 1607 | |
---|
| 1608 | void firstFromBNode(UEdge& edge, const Node& node) const { |
---|
| 1609 | LEMON_ASSERT((node.id & 1) == 1, NodeSetError()); |
---|
| 1610 | edge.id = bNodes[node.id >> 1].first_edge; |
---|
| 1611 | } |
---|
| 1612 | void nextFromBNode(UEdge& edge) const { |
---|
| 1613 | edge.id = edges[edge.id].next_in; |
---|
| 1614 | } |
---|
| 1615 | |
---|
| 1616 | static int id(const Node& node) { |
---|
| 1617 | return node.id; |
---|
| 1618 | } |
---|
| 1619 | static Node nodeFromId(int id) { |
---|
| 1620 | return Node(id); |
---|
| 1621 | } |
---|
| 1622 | int maxNodeId() const { |
---|
| 1623 | return aNodes.size() > bNodes.size() ? |
---|
| 1624 | aNodes.size() * 2 - 2 : bNodes.size() * 2 - 1; |
---|
| 1625 | } |
---|
| 1626 | |
---|
| 1627 | static int id(const UEdge& edge) { |
---|
| 1628 | return edge.id; |
---|
| 1629 | } |
---|
| 1630 | static UEdge uEdgeFromId(int id) { |
---|
| 1631 | return UEdge(id); |
---|
| 1632 | } |
---|
| 1633 | int maxUEdgeId() const { |
---|
| 1634 | return edges.size(); |
---|
| 1635 | } |
---|
| 1636 | |
---|
| 1637 | static int aNodeId(const Node& node) { |
---|
| 1638 | return node.id >> 1; |
---|
| 1639 | } |
---|
[2231] | 1640 | static Node nodeFromANodeId(int id) { |
---|
[2116] | 1641 | return Node(id << 1); |
---|
| 1642 | } |
---|
| 1643 | int maxANodeId() const { |
---|
| 1644 | return aNodes.size(); |
---|
| 1645 | } |
---|
| 1646 | |
---|
| 1647 | static int bNodeId(const Node& node) { |
---|
| 1648 | return node.id >> 1; |
---|
| 1649 | } |
---|
[2231] | 1650 | static Node nodeFromBNodeId(int id) { |
---|
[2116] | 1651 | return Node((id << 1) + 1); |
---|
| 1652 | } |
---|
| 1653 | int maxBNodeId() const { |
---|
| 1654 | return bNodes.size(); |
---|
| 1655 | } |
---|
| 1656 | |
---|
| 1657 | Node aNode(const UEdge& edge) const { |
---|
| 1658 | return Node(edges[edge.id].aNode); |
---|
| 1659 | } |
---|
| 1660 | Node bNode(const UEdge& edge) const { |
---|
| 1661 | return Node(edges[edge.id].bNode); |
---|
| 1662 | } |
---|
| 1663 | |
---|
| 1664 | static bool aNode(const Node& node) { |
---|
| 1665 | return (node.id & 1) == 0; |
---|
| 1666 | } |
---|
| 1667 | |
---|
| 1668 | static bool bNode(const Node& node) { |
---|
| 1669 | return (node.id & 1) == 1; |
---|
| 1670 | } |
---|
| 1671 | |
---|
| 1672 | Node addANode() { |
---|
[2386] | 1673 | int aid; |
---|
[2116] | 1674 | if (first_free_anode == -1) { |
---|
[2386] | 1675 | aid = aNodes.size(); |
---|
[2116] | 1676 | aNodes.push_back(NodeT()); |
---|
| 1677 | } else { |
---|
[2386] | 1678 | aid = first_free_anode; |
---|
[2116] | 1679 | first_free_anode = aNodes[first_free_anode].next; |
---|
| 1680 | } |
---|
| 1681 | if (first_anode != -1) { |
---|
[2386] | 1682 | aNodes[aid].next = first_anode << 1; |
---|
| 1683 | aNodes[first_anode].prev = aid << 1; |
---|
[2116] | 1684 | } else { |
---|
[2386] | 1685 | aNodes[aid].next = -1; |
---|
[2116] | 1686 | } |
---|
[2386] | 1687 | aNodes[aid].prev = -1; |
---|
| 1688 | first_anode = aid; |
---|
| 1689 | aNodes[aid].first_edge = -1; |
---|
| 1690 | return Node(aid << 1); |
---|
[2116] | 1691 | } |
---|
| 1692 | |
---|
| 1693 | Node addBNode() { |
---|
[2386] | 1694 | int bid; |
---|
[2116] | 1695 | if (first_free_bnode == -1) { |
---|
[2386] | 1696 | bid = bNodes.size(); |
---|
[2116] | 1697 | bNodes.push_back(NodeT()); |
---|
| 1698 | } else { |
---|
[2386] | 1699 | bid = first_free_bnode; |
---|
[2116] | 1700 | first_free_bnode = bNodes[first_free_bnode].next; |
---|
| 1701 | } |
---|
| 1702 | if (first_bnode != -1) { |
---|
[2386] | 1703 | bNodes[bid].next = (first_bnode << 1) + 1; |
---|
| 1704 | bNodes[first_bnode].prev = (bid << 1) + 1; |
---|
[2116] | 1705 | } else { |
---|
[2386] | 1706 | bNodes[bid].next = -1; |
---|
[2116] | 1707 | } |
---|
[2386] | 1708 | bNodes[bid].prev = -1; |
---|
| 1709 | first_bnode = bid; |
---|
| 1710 | bNodes[bid].first_edge = -1; |
---|
| 1711 | return Node((bid << 1) + 1); |
---|
[2116] | 1712 | } |
---|
| 1713 | |
---|
| 1714 | UEdge addEdge(const Node& source, const Node& target) { |
---|
| 1715 | LEMON_ASSERT(((source.id ^ target.id) & 1) == 1, NodeSetError()); |
---|
| 1716 | int edgeId; |
---|
| 1717 | if (first_free_edge != -1) { |
---|
| 1718 | edgeId = first_free_edge; |
---|
| 1719 | first_free_edge = edges[edgeId].next_out; |
---|
| 1720 | } else { |
---|
| 1721 | edgeId = edges.size(); |
---|
| 1722 | edges.push_back(UEdgeT()); |
---|
| 1723 | } |
---|
| 1724 | if ((source.id & 1) == 0) { |
---|
| 1725 | edges[edgeId].aNode = source.id; |
---|
| 1726 | edges[edgeId].bNode = target.id; |
---|
| 1727 | } else { |
---|
| 1728 | edges[edgeId].aNode = target.id; |
---|
| 1729 | edges[edgeId].bNode = source.id; |
---|
| 1730 | } |
---|
| 1731 | edges[edgeId].next_out = aNodes[edges[edgeId].aNode >> 1].first_edge; |
---|
| 1732 | edges[edgeId].prev_out = -1; |
---|
| 1733 | if (aNodes[edges[edgeId].aNode >> 1].first_edge != -1) { |
---|
| 1734 | edges[aNodes[edges[edgeId].aNode >> 1].first_edge].prev_out = edgeId; |
---|
| 1735 | } |
---|
| 1736 | aNodes[edges[edgeId].aNode >> 1].first_edge = edgeId; |
---|
| 1737 | edges[edgeId].next_in = bNodes[edges[edgeId].bNode >> 1].first_edge; |
---|
| 1738 | edges[edgeId].prev_in = -1; |
---|
| 1739 | if (bNodes[edges[edgeId].bNode >> 1].first_edge != -1) { |
---|
| 1740 | edges[bNodes[edges[edgeId].bNode >> 1].first_edge].prev_in = edgeId; |
---|
| 1741 | } |
---|
| 1742 | bNodes[edges[edgeId].bNode >> 1].first_edge = edgeId; |
---|
| 1743 | return UEdge(edgeId); |
---|
| 1744 | } |
---|
| 1745 | |
---|
| 1746 | void erase(const Node& node) { |
---|
| 1747 | if (aNode(node)) { |
---|
[2386] | 1748 | int aid = node.id >> 1; |
---|
| 1749 | if (aNodes[aid].prev != -1) { |
---|
| 1750 | aNodes[aNodes[aid].prev >> 1].next = aNodes[aid].next; |
---|
[2116] | 1751 | } else { |
---|
[2189] | 1752 | first_anode = |
---|
[2386] | 1753 | aNodes[aid].next != -1 ? aNodes[aid].next >> 1 : -1; |
---|
[2116] | 1754 | } |
---|
[2386] | 1755 | if (aNodes[aid].next != -1) { |
---|
| 1756 | aNodes[aNodes[aid].next >> 1].prev = aNodes[aid].prev; |
---|
[2116] | 1757 | } |
---|
[2386] | 1758 | aNodes[aid].next = first_free_anode; |
---|
| 1759 | first_free_anode = aid; |
---|
[2116] | 1760 | } else { |
---|
[2386] | 1761 | int bid = node.id >> 1; |
---|
| 1762 | if (bNodes[bid].prev != -1) { |
---|
| 1763 | bNodes[bNodes[bid].prev >> 1].next = bNodes[bid].next; |
---|
[2116] | 1764 | } else { |
---|
[2189] | 1765 | first_bnode = |
---|
[2386] | 1766 | bNodes[bid].next != -1 ? bNodes[bid].next >> 1 : -1; |
---|
[2116] | 1767 | } |
---|
[2386] | 1768 | if (bNodes[bid].next != -1) { |
---|
| 1769 | bNodes[bNodes[bid].next >> 1].prev = bNodes[bid].prev; |
---|
[2116] | 1770 | } |
---|
[2386] | 1771 | bNodes[bid].next = first_free_bnode; |
---|
| 1772 | first_free_bnode = bid; |
---|
[2116] | 1773 | } |
---|
| 1774 | } |
---|
| 1775 | |
---|
| 1776 | void erase(const UEdge& edge) { |
---|
| 1777 | |
---|
| 1778 | if (edges[edge.id].prev_out != -1) { |
---|
| 1779 | edges[edges[edge.id].prev_out].next_out = edges[edge.id].next_out; |
---|
| 1780 | } else { |
---|
| 1781 | aNodes[edges[edge.id].aNode >> 1].first_edge = edges[edge.id].next_out; |
---|
| 1782 | } |
---|
| 1783 | if (edges[edge.id].next_out != -1) { |
---|
| 1784 | edges[edges[edge.id].next_out].prev_out = edges[edge.id].prev_out; |
---|
| 1785 | } |
---|
| 1786 | |
---|
| 1787 | if (edges[edge.id].prev_in != -1) { |
---|
| 1788 | edges[edges[edge.id].prev_in].next_in = edges[edge.id].next_in; |
---|
| 1789 | } else { |
---|
| 1790 | bNodes[edges[edge.id].bNode >> 1].first_edge = edges[edge.id].next_in; |
---|
| 1791 | } |
---|
| 1792 | if (edges[edge.id].next_in != -1) { |
---|
| 1793 | edges[edges[edge.id].next_in].prev_in = edges[edge.id].prev_in; |
---|
| 1794 | } |
---|
| 1795 | |
---|
| 1796 | edges[edge.id].next_out = first_free_edge; |
---|
| 1797 | first_free_edge = edge.id; |
---|
| 1798 | } |
---|
[2128] | 1799 | |
---|
[2116] | 1800 | void clear() { |
---|
| 1801 | aNodes.clear(); |
---|
| 1802 | bNodes.clear(); |
---|
| 1803 | edges.clear(); |
---|
| 1804 | first_anode = -1; |
---|
| 1805 | first_free_anode = -1; |
---|
| 1806 | first_bnode = -1; |
---|
| 1807 | first_free_bnode = -1; |
---|
| 1808 | first_free_edge = -1; |
---|
| 1809 | } |
---|
| 1810 | |
---|
[2160] | 1811 | void changeANode(const UEdge& edge, const Node& node) { |
---|
| 1812 | LEMON_ASSERT((node.id & 1) == 0, NodeSetError()); |
---|
| 1813 | if (edges[edge.id].prev_out != -1) { |
---|
| 1814 | edges[edges[edge.id].prev_out].next_out = edges[edge.id].next_out; |
---|
| 1815 | } else { |
---|
| 1816 | aNodes[edges[edge.id].aNode >> 1].first_edge = edges[edge.id].next_out; |
---|
| 1817 | } |
---|
| 1818 | if (edges[edge.id].next_out != -1) { |
---|
| 1819 | edges[edges[edge.id].next_out].prev_out = edges[edge.id].prev_out; |
---|
| 1820 | } |
---|
| 1821 | if (aNodes[node.id >> 1].first_edge != -1) { |
---|
| 1822 | edges[aNodes[node.id >> 1].first_edge].prev_out = edge.id; |
---|
| 1823 | } |
---|
| 1824 | edges[edge.id].prev_out = -1; |
---|
| 1825 | edges[edge.id].next_out = aNodes[node.id >> 1].first_edge; |
---|
| 1826 | aNodes[node.id >> 1].first_edge = edge.id; |
---|
| 1827 | edges[edge.id].aNode = node.id; |
---|
| 1828 | } |
---|
| 1829 | |
---|
| 1830 | void changeBNode(const UEdge& edge, const Node& node) { |
---|
| 1831 | LEMON_ASSERT((node.id & 1) == 1, NodeSetError()); |
---|
| 1832 | if (edges[edge.id].prev_in != -1) { |
---|
| 1833 | edges[edges[edge.id].prev_in].next_in = edges[edge.id].next_in; |
---|
| 1834 | } else { |
---|
| 1835 | bNodes[edges[edge.id].bNode >> 1].first_edge = edges[edge.id].next_in; |
---|
| 1836 | } |
---|
| 1837 | if (edges[edge.id].next_in != -1) { |
---|
| 1838 | edges[edges[edge.id].next_in].prev_in = edges[edge.id].prev_in; |
---|
| 1839 | } |
---|
| 1840 | if (bNodes[node.id >> 1].first_edge != -1) { |
---|
| 1841 | edges[bNodes[node.id >> 1].first_edge].prev_in = edge.id; |
---|
| 1842 | } |
---|
| 1843 | edges[edge.id].prev_in = -1; |
---|
| 1844 | edges[edge.id].next_in = bNodes[node.id >> 1].first_edge; |
---|
| 1845 | bNodes[node.id >> 1].first_edge = edge.id; |
---|
| 1846 | edges[edge.id].bNode = node.id; |
---|
| 1847 | } |
---|
| 1848 | |
---|
[2116] | 1849 | }; |
---|
| 1850 | |
---|
| 1851 | |
---|
[2231] | 1852 | typedef BpUGraphExtender<BidirBpUGraphExtender<ListBpUGraphBase> > |
---|
| 1853 | ExtendedListBpUGraphBase; |
---|
[2116] | 1854 | |
---|
| 1855 | /// \ingroup graphs |
---|
| 1856 | /// |
---|
| 1857 | /// \brief A smart bipartite undirected graph class. |
---|
| 1858 | /// |
---|
| 1859 | /// This is a bipartite undirected graph implementation. |
---|
[2260] | 1860 | /// It is conforms to the \ref concepts::BpUGraph "BpUGraph concept". |
---|
[2256] | 1861 | /// |
---|
| 1862 | ///An important extra feature of this graph implementation is that |
---|
[2260] | 1863 | ///its maps are real \ref concepts::ReferenceMap "reference map"s. |
---|
[2256] | 1864 | /// |
---|
[2260] | 1865 | /// \sa concepts::BpUGraph. |
---|
[2116] | 1866 | /// |
---|
[2160] | 1867 | class ListBpUGraph : public ExtendedListBpUGraphBase { |
---|
| 1868 | /// \brief ListBpUGraph is \e not copy constructible. |
---|
| 1869 | /// |
---|
| 1870 | ///ListBpUGraph is \e not copy constructible. |
---|
| 1871 | ListBpUGraph(const ListBpUGraph &) :ExtendedListBpUGraphBase() {}; |
---|
| 1872 | /// \brief Assignment of ListBpUGraph to another one is \e not |
---|
| 1873 | /// allowed. |
---|
| 1874 | /// |
---|
| 1875 | /// Assignment of ListBpUGraph to another one is \e not allowed. |
---|
| 1876 | void operator=(const ListBpUGraph &) {} |
---|
| 1877 | public: |
---|
| 1878 | /// \brief Constructor |
---|
| 1879 | /// |
---|
| 1880 | /// Constructor. |
---|
| 1881 | /// |
---|
| 1882 | ListBpUGraph() {} |
---|
| 1883 | |
---|
| 1884 | typedef ExtendedListBpUGraphBase Parent; |
---|
| 1885 | /// \brief Add a new ANode to the graph. |
---|
| 1886 | /// |
---|
| 1887 | /// \return the new node. |
---|
| 1888 | /// |
---|
| 1889 | Node addANode() { return Parent::addANode(); } |
---|
| 1890 | |
---|
| 1891 | /// \brief Add a new BNode to the graph. |
---|
| 1892 | /// |
---|
| 1893 | /// \return the new node. |
---|
| 1894 | /// |
---|
| 1895 | Node addBNode() { return Parent::addBNode(); } |
---|
| 1896 | |
---|
| 1897 | /// \brief Add a new edge to the graph. |
---|
| 1898 | /// |
---|
| 1899 | /// Add a new edge to the graph with an ANode and a BNode. |
---|
| 1900 | /// \return the new undirected edge. |
---|
| 1901 | UEdge addEdge(const Node& s, const Node& t) { |
---|
| 1902 | return Parent::addEdge(s, t); |
---|
| 1903 | } |
---|
| 1904 | |
---|
| 1905 | /// \brief Changes the ANode of \c e to \c n |
---|
| 1906 | /// |
---|
| 1907 | /// Changes the ANode of \c e to \c n |
---|
| 1908 | /// |
---|
| 1909 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s referencing |
---|
| 1910 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
---|
| 1911 | ///invalidated. |
---|
| 1912 | void changeANode(UEdge e, Node n) { |
---|
| 1913 | Parent::changeANode(e,n); |
---|
| 1914 | } |
---|
| 1915 | |
---|
| 1916 | /// \brief Changes the BNode of \c e to \c n |
---|
| 1917 | /// |
---|
| 1918 | /// Changes the BNode of \c e to \c n |
---|
| 1919 | /// |
---|
| 1920 | /// \note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1921 | /// referencing the changed edge remain |
---|
| 1922 | /// valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1923 | void changeBNode(UEdge e, Node n) { |
---|
| 1924 | Parent::changeBNode(e,n); |
---|
| 1925 | } |
---|
| 1926 | |
---|
| 1927 | /// \brief Changes the source(ANode) of \c e to \c n |
---|
| 1928 | /// |
---|
| 1929 | /// Changes the source(ANode) of \c e to \c n |
---|
| 1930 | /// |
---|
| 1931 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s referencing |
---|
| 1932 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
---|
| 1933 | ///invalidated. |
---|
| 1934 | void changeSource(UEdge e, Node n) { |
---|
| 1935 | Parent::changeANode(e,n); |
---|
| 1936 | } |
---|
| 1937 | |
---|
| 1938 | /// \brief Changes the target(BNode) of \c e to \c n |
---|
| 1939 | /// |
---|
| 1940 | /// Changes the target(BNode) of \c e to \c n |
---|
| 1941 | /// |
---|
| 1942 | /// \note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1943 | /// referencing the changed edge remain |
---|
| 1944 | /// valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1945 | void changeTarget(UEdge e, Node n) { |
---|
| 1946 | Parent::changeBNode(e,n); |
---|
| 1947 | } |
---|
| 1948 | |
---|
| 1949 | /// \brief Changes the source of \c e to \c n |
---|
| 1950 | /// |
---|
| 1951 | /// Changes the source of \c e to \c n. It changes the proper |
---|
| 1952 | /// node of the represented undirected edge. |
---|
| 1953 | /// |
---|
| 1954 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
| 1955 | ///referencing the changed edge remain |
---|
| 1956 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 1957 | void changeSource(Edge e, Node n) { |
---|
| 1958 | if (Parent::direction(e)) { |
---|
| 1959 | Parent::changeANode(e,n); |
---|
| 1960 | } else { |
---|
| 1961 | Parent::changeBNode(e,n); |
---|
| 1962 | } |
---|
| 1963 | } |
---|
| 1964 | /// \brief Changes the target of \c e to \c n |
---|
| 1965 | /// |
---|
| 1966 | /// Changes the target of \c e to \c n. It changes the proper |
---|
| 1967 | /// node of the represented undirected edge. |
---|
| 1968 | /// |
---|
| 1969 | ///\note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1970 | ///referencing the changed edge remain |
---|
| 1971 | ///valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1972 | void changeTarget(Edge e, Node n) { |
---|
| 1973 | if (Parent::direction(e)) { |
---|
| 1974 | Parent::changeBNode(e,n); |
---|
| 1975 | } else { |
---|
| 1976 | Parent::changeANode(e,n); |
---|
| 1977 | } |
---|
| 1978 | } |
---|
| 1979 | /// \brief Contract two nodes. |
---|
| 1980 | /// |
---|
| 1981 | /// This function contracts two nodes. |
---|
| 1982 | /// |
---|
| 1983 | /// Node \p b will be removed but instead of deleting its |
---|
| 1984 | /// neighboring edges, they will be joined to \p a. The two nodes |
---|
| 1985 | /// should be from the same nodeset, of course. |
---|
| 1986 | /// |
---|
| 1987 | /// \note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
| 1988 | /// valid. |
---|
| 1989 | void contract(const Node& a, const Node& b) { |
---|
| 1990 | LEMON_ASSERT(Parent::aNode(a) == Parent::aNode(b), NodeSetError()); |
---|
| 1991 | if (Parent::aNode(a)) { |
---|
| 1992 | for (IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 1993 | IncEdgeIt f = e; ++f; |
---|
| 1994 | changeSource(e, a); |
---|
| 1995 | e = f; |
---|
| 1996 | } |
---|
| 1997 | } else { |
---|
| 1998 | for (IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 1999 | IncEdgeIt f = e; ++f; |
---|
| 2000 | changeTarget(e, a); |
---|
| 2001 | e = f; |
---|
| 2002 | } |
---|
| 2003 | } |
---|
| 2004 | erase(b); |
---|
| 2005 | } |
---|
| 2006 | |
---|
[2189] | 2007 | /// \brief Class to make a snapshot of the graph and restore |
---|
| 2008 | /// to it later. |
---|
| 2009 | /// |
---|
| 2010 | /// Class to make a snapshot of the graph and to restore it |
---|
| 2011 | /// later. |
---|
| 2012 | /// |
---|
| 2013 | /// The newly added nodes and undirected edges can be removed |
---|
| 2014 | /// using the restore() function. |
---|
| 2015 | /// |
---|
| 2016 | /// \warning Edge and node deletions cannot be restored. This |
---|
| 2017 | /// events invalidate the snapshot. |
---|
| 2018 | class Snapshot { |
---|
| 2019 | protected: |
---|
| 2020 | |
---|
| 2021 | typedef Parent::NodeNotifier NodeNotifier; |
---|
| 2022 | |
---|
| 2023 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
| 2024 | public: |
---|
| 2025 | |
---|
| 2026 | NodeObserverProxy(Snapshot& _snapshot) |
---|
| 2027 | : snapshot(_snapshot) {} |
---|
| 2028 | |
---|
| 2029 | using NodeNotifier::ObserverBase::attach; |
---|
| 2030 | using NodeNotifier::ObserverBase::detach; |
---|
| 2031 | using NodeNotifier::ObserverBase::attached; |
---|
| 2032 | |
---|
| 2033 | protected: |
---|
| 2034 | |
---|
| 2035 | virtual void add(const Node& node) { |
---|
| 2036 | snapshot.addNode(node); |
---|
| 2037 | } |
---|
| 2038 | virtual void add(const std::vector<Node>& nodes) { |
---|
| 2039 | for (int i = nodes.size() - 1; i >= 0; ++i) { |
---|
| 2040 | snapshot.addNode(nodes[i]); |
---|
| 2041 | } |
---|
| 2042 | } |
---|
| 2043 | virtual void erase(const Node& node) { |
---|
| 2044 | snapshot.eraseNode(node); |
---|
| 2045 | } |
---|
| 2046 | virtual void erase(const std::vector<Node>& nodes) { |
---|
[2386] | 2047 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
[2189] | 2048 | snapshot.eraseNode(nodes[i]); |
---|
| 2049 | } |
---|
| 2050 | } |
---|
| 2051 | virtual void build() { |
---|
| 2052 | Node node; |
---|
| 2053 | std::vector<Node> nodes; |
---|
[2386] | 2054 | for (notifier()->first(node); node != INVALID; |
---|
| 2055 | notifier()->next(node)) { |
---|
[2189] | 2056 | nodes.push_back(node); |
---|
| 2057 | } |
---|
| 2058 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
| 2059 | snapshot.addNode(nodes[i]); |
---|
| 2060 | } |
---|
| 2061 | } |
---|
| 2062 | virtual void clear() { |
---|
| 2063 | Node node; |
---|
[2386] | 2064 | for (notifier()->first(node); node != INVALID; |
---|
| 2065 | notifier()->next(node)) { |
---|
[2189] | 2066 | snapshot.eraseNode(node); |
---|
| 2067 | } |
---|
| 2068 | } |
---|
| 2069 | |
---|
| 2070 | Snapshot& snapshot; |
---|
| 2071 | }; |
---|
| 2072 | |
---|
| 2073 | class UEdgeObserverProxy : public UEdgeNotifier::ObserverBase { |
---|
| 2074 | public: |
---|
| 2075 | |
---|
| 2076 | UEdgeObserverProxy(Snapshot& _snapshot) |
---|
| 2077 | : snapshot(_snapshot) {} |
---|
| 2078 | |
---|
| 2079 | using UEdgeNotifier::ObserverBase::attach; |
---|
| 2080 | using UEdgeNotifier::ObserverBase::detach; |
---|
| 2081 | using UEdgeNotifier::ObserverBase::attached; |
---|
| 2082 | |
---|
| 2083 | protected: |
---|
| 2084 | |
---|
| 2085 | virtual void add(const UEdge& edge) { |
---|
| 2086 | snapshot.addUEdge(edge); |
---|
| 2087 | } |
---|
| 2088 | virtual void add(const std::vector<UEdge>& edges) { |
---|
| 2089 | for (int i = edges.size() - 1; i >= 0; ++i) { |
---|
| 2090 | snapshot.addUEdge(edges[i]); |
---|
| 2091 | } |
---|
| 2092 | } |
---|
| 2093 | virtual void erase(const UEdge& edge) { |
---|
| 2094 | snapshot.eraseUEdge(edge); |
---|
| 2095 | } |
---|
| 2096 | virtual void erase(const std::vector<UEdge>& edges) { |
---|
[2386] | 2097 | for (int i = 0; i < int(edges.size()); ++i) { |
---|
[2189] | 2098 | snapshot.eraseUEdge(edges[i]); |
---|
| 2099 | } |
---|
| 2100 | } |
---|
| 2101 | virtual void build() { |
---|
| 2102 | UEdge edge; |
---|
| 2103 | std::vector<UEdge> edges; |
---|
[2386] | 2104 | for (notifier()->first(edge); edge != INVALID; |
---|
| 2105 | notifier()->next(edge)) { |
---|
[2189] | 2106 | edges.push_back(edge); |
---|
| 2107 | } |
---|
| 2108 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
| 2109 | snapshot.addUEdge(edges[i]); |
---|
| 2110 | } |
---|
| 2111 | } |
---|
| 2112 | virtual void clear() { |
---|
| 2113 | UEdge edge; |
---|
[2386] | 2114 | for (notifier()->first(edge); edge != INVALID; |
---|
| 2115 | notifier()->next(edge)) { |
---|
[2189] | 2116 | snapshot.eraseUEdge(edge); |
---|
| 2117 | } |
---|
| 2118 | } |
---|
| 2119 | |
---|
| 2120 | Snapshot& snapshot; |
---|
| 2121 | }; |
---|
| 2122 | |
---|
| 2123 | ListBpUGraph *graph; |
---|
| 2124 | |
---|
| 2125 | NodeObserverProxy node_observer_proxy; |
---|
| 2126 | UEdgeObserverProxy edge_observer_proxy; |
---|
| 2127 | |
---|
| 2128 | std::list<Node> added_nodes; |
---|
| 2129 | std::list<UEdge> added_edges; |
---|
| 2130 | |
---|
| 2131 | |
---|
| 2132 | void addNode(const Node& node) { |
---|
| 2133 | added_nodes.push_front(node); |
---|
| 2134 | } |
---|
| 2135 | void eraseNode(const Node& node) { |
---|
| 2136 | std::list<Node>::iterator it = |
---|
| 2137 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
| 2138 | if (it == added_nodes.end()) { |
---|
| 2139 | clear(); |
---|
| 2140 | edge_observer_proxy.detach(); |
---|
| 2141 | throw NodeNotifier::ImmediateDetach(); |
---|
| 2142 | } else { |
---|
| 2143 | added_nodes.erase(it); |
---|
| 2144 | } |
---|
| 2145 | } |
---|
| 2146 | |
---|
| 2147 | void addUEdge(const UEdge& edge) { |
---|
| 2148 | added_edges.push_front(edge); |
---|
| 2149 | } |
---|
| 2150 | void eraseUEdge(const UEdge& edge) { |
---|
| 2151 | std::list<UEdge>::iterator it = |
---|
| 2152 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
| 2153 | if (it == added_edges.end()) { |
---|
| 2154 | clear(); |
---|
| 2155 | node_observer_proxy.detach(); |
---|
| 2156 | throw UEdgeNotifier::ImmediateDetach(); |
---|
| 2157 | } else { |
---|
| 2158 | added_edges.erase(it); |
---|
| 2159 | } |
---|
| 2160 | } |
---|
| 2161 | |
---|
| 2162 | void attach(ListBpUGraph &_graph) { |
---|
| 2163 | graph = &_graph; |
---|
[2381] | 2164 | node_observer_proxy.attach(graph->notifier(Node())); |
---|
| 2165 | edge_observer_proxy.attach(graph->notifier(UEdge())); |
---|
[2189] | 2166 | } |
---|
| 2167 | |
---|
| 2168 | void detach() { |
---|
| 2169 | node_observer_proxy.detach(); |
---|
| 2170 | edge_observer_proxy.detach(); |
---|
| 2171 | } |
---|
| 2172 | |
---|
| 2173 | bool attached() const { |
---|
| 2174 | return node_observer_proxy.attached(); |
---|
| 2175 | } |
---|
| 2176 | |
---|
| 2177 | void clear() { |
---|
| 2178 | added_nodes.clear(); |
---|
| 2179 | added_edges.clear(); |
---|
| 2180 | } |
---|
| 2181 | |
---|
| 2182 | public: |
---|
| 2183 | |
---|
| 2184 | /// \brief Default constructor. |
---|
| 2185 | /// |
---|
| 2186 | /// Default constructor. |
---|
| 2187 | /// To actually make a snapshot you must call save(). |
---|
| 2188 | Snapshot() |
---|
| 2189 | : graph(0), node_observer_proxy(*this), |
---|
| 2190 | edge_observer_proxy(*this) {} |
---|
| 2191 | |
---|
| 2192 | /// \brief Constructor that immediately makes a snapshot. |
---|
| 2193 | /// |
---|
| 2194 | /// This constructor immediately makes a snapshot of the graph. |
---|
| 2195 | /// \param _graph The graph we make a snapshot of. |
---|
| 2196 | Snapshot(ListBpUGraph &_graph) |
---|
| 2197 | : node_observer_proxy(*this), |
---|
| 2198 | edge_observer_proxy(*this) { |
---|
| 2199 | attach(_graph); |
---|
| 2200 | } |
---|
| 2201 | |
---|
| 2202 | /// \brief Make a snapshot. |
---|
| 2203 | /// |
---|
| 2204 | /// Make a snapshot of the graph. |
---|
| 2205 | /// |
---|
| 2206 | /// This function can be called more than once. In case of a repeated |
---|
| 2207 | /// call, the previous snapshot gets lost. |
---|
| 2208 | /// \param _graph The graph we make the snapshot of. |
---|
| 2209 | void save(ListBpUGraph &_graph) { |
---|
| 2210 | if (attached()) { |
---|
| 2211 | detach(); |
---|
| 2212 | clear(); |
---|
| 2213 | } |
---|
| 2214 | attach(_graph); |
---|
| 2215 | } |
---|
| 2216 | |
---|
| 2217 | /// \brief Undo the changes until the last snapshot. |
---|
| 2218 | // |
---|
| 2219 | /// Undo the changes until the last snapshot created by save(). |
---|
| 2220 | void restore() { |
---|
| 2221 | detach(); |
---|
| 2222 | for(std::list<UEdge>::iterator it = added_edges.begin(); |
---|
| 2223 | it != added_edges.end(); ++it) { |
---|
| 2224 | graph->erase(*it); |
---|
| 2225 | } |
---|
| 2226 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
| 2227 | it != added_nodes.end(); ++it) { |
---|
| 2228 | graph->erase(*it); |
---|
| 2229 | } |
---|
| 2230 | clear(); |
---|
| 2231 | } |
---|
| 2232 | |
---|
| 2233 | /// \brief Gives back true when the snapshot is valid. |
---|
| 2234 | /// |
---|
| 2235 | /// Gives back true when the snapshot is valid. |
---|
| 2236 | bool valid() const { |
---|
| 2237 | return attached(); |
---|
| 2238 | } |
---|
| 2239 | }; |
---|
[2160] | 2240 | }; |
---|
[2116] | 2241 | |
---|
| 2242 | |
---|
| 2243 | /// @} |
---|
[948] | 2244 | } //namespace lemon |
---|
[946] | 2245 | |
---|
[400] | 2246 | |
---|
[946] | 2247 | #endif |
---|