[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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[2553] | 5 | * Copyright (C) 2003-2008 |
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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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[2618] | 121 | n = nodes[n].next) { } |
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[946] | 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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[2618] | 131 | n!=-1 && nodes[n].first_in == -1; |
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| 132 | n = nodes[n].next) { } |
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[946] | 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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[2456] | 392 | /// Using this it is possible to avoid the superfluous memory |
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| 393 | /// allocation: if you know that the graph you want to build will |
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| 394 | /// be very large (e.g. it will contain millions of nodes and/or edges) |
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| 395 | /// then it is worth reserving space for this amount before starting |
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| 396 | /// to build the graph. |
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| 397 | /// \sa reserveEdge |
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[2107] | 398 | void reserveNode(int n) { nodes.reserve(n); }; |
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| 399 | |
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[2111] | 400 | /// \brief Using this it is possible to avoid the superfluous memory |
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| 401 | /// allocation. |
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[2107] | 402 | |
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[2456] | 403 | /// Using this it is possible to avoid the superfluous memory |
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| 404 | /// allocation: if you know that the graph you want to build will |
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| 405 | /// be very large (e.g. it will contain millions of nodes and/or edges) |
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| 406 | /// then it is worth reserving space for this amount before starting |
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| 407 | /// to build the graph. |
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| 408 | /// \sa reserveNode |
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| 409 | void reserveEdge(int m) { edges.reserve(m); }; |
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[2107] | 410 | |
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[1010] | 411 | ///Contract two nodes. |
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| 412 | |
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| 413 | ///This function contracts two nodes. |
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| 414 | /// |
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| 415 | ///Node \p b will be removed but instead of deleting |
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[2102] | 416 | ///incident edges, they will be joined to \p a. |
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[1010] | 417 | ///The last parameter \p r controls whether to remove loops. \c true |
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| 418 | ///means that loops will be removed. |
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| 419 | /// |
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[2160] | 420 | ///\note The <tt>EdgeIt</tt>s |
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[1281] | 421 | ///referencing a moved edge remain |
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[2160] | 422 | ///valid. However <tt>InEdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
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[1010] | 423 | ///may be invalidated. |
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[2123] | 424 | ///\warning This functionality cannot be used together with the Snapshot |
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| 425 | ///feature. |
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[1718] | 426 | void contract(Node a, Node b, bool r = true) |
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[1010] | 427 | { |
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| 428 | for(OutEdgeIt e(*this,b);e!=INVALID;) { |
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| 429 | OutEdgeIt f=e; |
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| 430 | ++f; |
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| 431 | if(r && target(e)==a) erase(e); |
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[1546] | 432 | else changeSource(e,a); |
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[1010] | 433 | e=f; |
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| 434 | } |
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| 435 | for(InEdgeIt e(*this,b);e!=INVALID;) { |
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| 436 | InEdgeIt f=e; |
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| 437 | ++f; |
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| 438 | if(r && source(e)==a) erase(e); |
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[1546] | 439 | else changeTarget(e,a); |
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[1010] | 440 | e=f; |
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| 441 | } |
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| 442 | erase(b); |
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| 443 | } |
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[1011] | 444 | |
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[1281] | 445 | ///Split a node. |
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[1011] | 446 | |
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[1284] | 447 | ///This function splits a node. First a new node is added to the graph, |
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| 448 | ///then the source of each outgoing edge of \c n is moved to this new node. |
---|
[1281] | 449 | ///If \c connect is \c true (this is the default value), then a new edge |
---|
| 450 | ///from \c n to the newly created node is also added. |
---|
| 451 | ///\return The newly created node. |
---|
| 452 | /// |
---|
[2160] | 453 | ///\note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
| 454 | ///valid. However <tt>InEdgeIt</tt>s and <tt>OutEdgeIt</tt>s may |
---|
| 455 | ///be invalidated. |
---|
| 456 | /// |
---|
| 457 | ///\warning This functionality cannot be used together with the |
---|
| 458 | ///Snapshot feature. \todo It could be implemented in a bit |
---|
| 459 | ///faster way. |
---|
[2114] | 460 | Node split(Node n, bool connect = true) { |
---|
[1281] | 461 | Node b = addNode(); |
---|
| 462 | for(OutEdgeIt e(*this,n);e!=INVALID;) { |
---|
| 463 | OutEdgeIt f=e; |
---|
| 464 | ++f; |
---|
[1546] | 465 | changeSource(e,b); |
---|
[1281] | 466 | e=f; |
---|
| 467 | } |
---|
[2114] | 468 | if (connect) addEdge(n,b); |
---|
[1281] | 469 | return b; |
---|
| 470 | } |
---|
| 471 | |
---|
[1812] | 472 | ///Split an edge. |
---|
| 473 | |
---|
[2102] | 474 | ///This function splits an edge. First a new node \c b is added to |
---|
| 475 | ///the graph, then the original edge is re-targeted to \c |
---|
| 476 | ///b. Finally an edge from \c b to the original target is added. |
---|
| 477 | ///\return The newly created node. |
---|
| 478 | ///\warning This functionality |
---|
| 479 | ///cannot be used together with the Snapshot feature. |
---|
[2114] | 480 | Node split(Edge e) { |
---|
[1812] | 481 | Node b = addNode(); |
---|
| 482 | addEdge(b,target(e)); |
---|
| 483 | changeTarget(e,b); |
---|
| 484 | return b; |
---|
| 485 | } |
---|
| 486 | |
---|
[2114] | 487 | /// \brief Class to make a snapshot of the graph and restore |
---|
| 488 | /// to it later. |
---|
[1011] | 489 | /// |
---|
[2114] | 490 | /// Class to make a snapshot of the graph and to restore it |
---|
| 491 | /// later. |
---|
[1011] | 492 | /// |
---|
[2114] | 493 | /// The newly added nodes and edges can be removed using the |
---|
| 494 | /// restore() function. |
---|
| 495 | /// |
---|
[2189] | 496 | /// \warning Edge and node deletions cannot be restored. This |
---|
| 497 | /// events invalidate the snapshot. |
---|
[2114] | 498 | class Snapshot { |
---|
[1999] | 499 | protected: |
---|
[2114] | 500 | |
---|
| 501 | typedef Parent::NodeNotifier NodeNotifier; |
---|
| 502 | |
---|
| 503 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
| 504 | public: |
---|
| 505 | |
---|
| 506 | NodeObserverProxy(Snapshot& _snapshot) |
---|
| 507 | : snapshot(_snapshot) {} |
---|
| 508 | |
---|
| 509 | using NodeNotifier::ObserverBase::attach; |
---|
| 510 | using NodeNotifier::ObserverBase::detach; |
---|
| 511 | using NodeNotifier::ObserverBase::attached; |
---|
| 512 | |
---|
| 513 | protected: |
---|
| 514 | |
---|
| 515 | virtual void add(const Node& node) { |
---|
| 516 | snapshot.addNode(node); |
---|
| 517 | } |
---|
| 518 | virtual void add(const std::vector<Node>& nodes) { |
---|
| 519 | for (int i = nodes.size() - 1; i >= 0; ++i) { |
---|
| 520 | snapshot.addNode(nodes[i]); |
---|
| 521 | } |
---|
| 522 | } |
---|
| 523 | virtual void erase(const Node& node) { |
---|
| 524 | snapshot.eraseNode(node); |
---|
| 525 | } |
---|
| 526 | virtual void erase(const std::vector<Node>& nodes) { |
---|
[2386] | 527 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
[2189] | 528 | snapshot.eraseNode(nodes[i]); |
---|
[2114] | 529 | } |
---|
| 530 | } |
---|
| 531 | virtual void build() { |
---|
| 532 | Node node; |
---|
| 533 | std::vector<Node> nodes; |
---|
[2386] | 534 | for (notifier()->first(node); node != INVALID; |
---|
| 535 | notifier()->next(node)) { |
---|
[2114] | 536 | nodes.push_back(node); |
---|
| 537 | } |
---|
| 538 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
| 539 | snapshot.addNode(nodes[i]); |
---|
| 540 | } |
---|
| 541 | } |
---|
| 542 | virtual void clear() { |
---|
| 543 | Node node; |
---|
[2386] | 544 | for (notifier()->first(node); node != INVALID; |
---|
| 545 | notifier()->next(node)) { |
---|
[2189] | 546 | snapshot.eraseNode(node); |
---|
[2114] | 547 | } |
---|
| 548 | } |
---|
| 549 | |
---|
| 550 | Snapshot& snapshot; |
---|
| 551 | }; |
---|
| 552 | |
---|
| 553 | class EdgeObserverProxy : public EdgeNotifier::ObserverBase { |
---|
| 554 | public: |
---|
| 555 | |
---|
| 556 | EdgeObserverProxy(Snapshot& _snapshot) |
---|
| 557 | : snapshot(_snapshot) {} |
---|
| 558 | |
---|
| 559 | using EdgeNotifier::ObserverBase::attach; |
---|
| 560 | using EdgeNotifier::ObserverBase::detach; |
---|
| 561 | using EdgeNotifier::ObserverBase::attached; |
---|
| 562 | |
---|
| 563 | protected: |
---|
| 564 | |
---|
| 565 | virtual void add(const Edge& edge) { |
---|
| 566 | snapshot.addEdge(edge); |
---|
| 567 | } |
---|
| 568 | virtual void add(const std::vector<Edge>& edges) { |
---|
| 569 | for (int i = edges.size() - 1; i >= 0; ++i) { |
---|
| 570 | snapshot.addEdge(edges[i]); |
---|
| 571 | } |
---|
| 572 | } |
---|
| 573 | virtual void erase(const Edge& edge) { |
---|
| 574 | snapshot.eraseEdge(edge); |
---|
| 575 | } |
---|
| 576 | virtual void erase(const std::vector<Edge>& edges) { |
---|
[2386] | 577 | for (int i = 0; i < int(edges.size()); ++i) { |
---|
[2189] | 578 | snapshot.eraseEdge(edges[i]); |
---|
[2114] | 579 | } |
---|
| 580 | } |
---|
| 581 | virtual void build() { |
---|
| 582 | Edge edge; |
---|
| 583 | std::vector<Edge> edges; |
---|
[2386] | 584 | for (notifier()->first(edge); edge != INVALID; |
---|
| 585 | notifier()->next(edge)) { |
---|
[2114] | 586 | edges.push_back(edge); |
---|
| 587 | } |
---|
| 588 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
| 589 | snapshot.addEdge(edges[i]); |
---|
| 590 | } |
---|
| 591 | } |
---|
| 592 | virtual void clear() { |
---|
| 593 | Edge edge; |
---|
[2386] | 594 | for (notifier()->first(edge); edge != INVALID; |
---|
| 595 | notifier()->next(edge)) { |
---|
[2189] | 596 | snapshot.eraseEdge(edge); |
---|
[2114] | 597 | } |
---|
| 598 | } |
---|
| 599 | |
---|
| 600 | Snapshot& snapshot; |
---|
| 601 | }; |
---|
[1011] | 602 | |
---|
[2114] | 603 | ListGraph *graph; |
---|
| 604 | |
---|
| 605 | NodeObserverProxy node_observer_proxy; |
---|
| 606 | EdgeObserverProxy edge_observer_proxy; |
---|
| 607 | |
---|
[1011] | 608 | std::list<Node> added_nodes; |
---|
| 609 | std::list<Edge> added_edges; |
---|
[2114] | 610 | |
---|
| 611 | |
---|
| 612 | void addNode(const Node& node) { |
---|
| 613 | added_nodes.push_front(node); |
---|
[1011] | 614 | } |
---|
[2189] | 615 | void eraseNode(const Node& node) { |
---|
[2114] | 616 | std::list<Node>::iterator it = |
---|
| 617 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
| 618 | if (it == added_nodes.end()) { |
---|
| 619 | clear(); |
---|
[2189] | 620 | edge_observer_proxy.detach(); |
---|
| 621 | throw NodeNotifier::ImmediateDetach(); |
---|
[2114] | 622 | } else { |
---|
| 623 | added_nodes.erase(it); |
---|
| 624 | } |
---|
[1011] | 625 | } |
---|
| 626 | |
---|
[2114] | 627 | void addEdge(const Edge& edge) { |
---|
| 628 | added_edges.push_front(edge); |
---|
| 629 | } |
---|
[2189] | 630 | void eraseEdge(const Edge& edge) { |
---|
[2114] | 631 | std::list<Edge>::iterator it = |
---|
| 632 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
| 633 | if (it == added_edges.end()) { |
---|
| 634 | clear(); |
---|
[2189] | 635 | node_observer_proxy.detach(); |
---|
| 636 | throw EdgeNotifier::ImmediateDetach(); |
---|
[2114] | 637 | } else { |
---|
| 638 | added_edges.erase(it); |
---|
| 639 | } |
---|
| 640 | } |
---|
[1457] | 641 | |
---|
[2114] | 642 | void attach(ListGraph &_graph) { |
---|
| 643 | graph = &_graph; |
---|
[2381] | 644 | node_observer_proxy.attach(graph->notifier(Node())); |
---|
| 645 | edge_observer_proxy.attach(graph->notifier(Edge())); |
---|
[1011] | 646 | } |
---|
| 647 | |
---|
[2114] | 648 | void detach() { |
---|
| 649 | node_observer_proxy.detach(); |
---|
| 650 | edge_observer_proxy.detach(); |
---|
| 651 | } |
---|
| 652 | |
---|
[2189] | 653 | bool attached() const { |
---|
| 654 | return node_observer_proxy.attached(); |
---|
| 655 | } |
---|
| 656 | |
---|
[2114] | 657 | void clear() { |
---|
| 658 | added_nodes.clear(); |
---|
| 659 | added_edges.clear(); |
---|
[1011] | 660 | } |
---|
[1774] | 661 | |
---|
[1011] | 662 | public: |
---|
[2114] | 663 | |
---|
[2160] | 664 | /// \brief Default constructor. |
---|
[2114] | 665 | /// |
---|
| 666 | /// Default constructor. |
---|
| 667 | /// To actually make a snapshot you must call save(). |
---|
| 668 | Snapshot() |
---|
| 669 | : graph(0), node_observer_proxy(*this), |
---|
| 670 | edge_observer_proxy(*this) {} |
---|
[1011] | 671 | |
---|
[2114] | 672 | /// \brief Constructor that immediately makes a snapshot. |
---|
| 673 | /// |
---|
| 674 | /// This constructor immediately makes a snapshot of the graph. |
---|
| 675 | /// \param _graph The graph we make a snapshot of. |
---|
| 676 | Snapshot(ListGraph &_graph) |
---|
| 677 | : node_observer_proxy(*this), |
---|
| 678 | edge_observer_proxy(*this) { |
---|
| 679 | attach(_graph); |
---|
[1011] | 680 | } |
---|
| 681 | |
---|
[2114] | 682 | /// \brief Make a snapshot. |
---|
[1011] | 683 | /// |
---|
[2114] | 684 | /// Make a snapshot of the graph. |
---|
| 685 | /// |
---|
| 686 | /// This function can be called more than once. In case of a repeated |
---|
| 687 | /// call, the previous snapshot gets lost. |
---|
| 688 | /// \param _graph The graph we make the snapshot of. |
---|
| 689 | void save(ListGraph &_graph) { |
---|
[2189] | 690 | if (attached()) { |
---|
| 691 | detach(); |
---|
| 692 | clear(); |
---|
| 693 | } |
---|
[2114] | 694 | attach(_graph); |
---|
[1011] | 695 | } |
---|
| 696 | |
---|
[2114] | 697 | /// \brief Undo the changes until the last snapshot. |
---|
| 698 | // |
---|
[2123] | 699 | /// Undo the changes until the last snapshot created by save(). |
---|
[1011] | 700 | void restore() { |
---|
[2114] | 701 | detach(); |
---|
[2189] | 702 | for(std::list<Edge>::iterator it = added_edges.begin(); |
---|
| 703 | it != added_edges.end(); ++it) { |
---|
| 704 | graph->erase(*it); |
---|
[1011] | 705 | } |
---|
[2189] | 706 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
| 707 | it != added_nodes.end(); ++it) { |
---|
| 708 | graph->erase(*it); |
---|
[1011] | 709 | } |
---|
[2189] | 710 | clear(); |
---|
[1011] | 711 | } |
---|
[2114] | 712 | |
---|
| 713 | /// \brief Gives back true when the snapshot is valid. |
---|
| 714 | /// |
---|
| 715 | /// Gives back true when the snapshot is valid. |
---|
| 716 | bool valid() const { |
---|
[2189] | 717 | return attached(); |
---|
[2114] | 718 | } |
---|
[1011] | 719 | }; |
---|
| 720 | |
---|
[949] | 721 | }; |
---|
[1034] | 722 | |
---|
[2116] | 723 | ///@} |
---|
| 724 | |
---|
[2338] | 725 | class ListUGraphBase { |
---|
[2116] | 726 | |
---|
[2338] | 727 | protected: |
---|
| 728 | |
---|
| 729 | struct NodeT { |
---|
| 730 | int first_out; |
---|
| 731 | int prev, next; |
---|
| 732 | }; |
---|
| 733 | |
---|
| 734 | struct EdgeT { |
---|
| 735 | int target; |
---|
| 736 | int prev_out, next_out; |
---|
| 737 | }; |
---|
| 738 | |
---|
| 739 | std::vector<NodeT> nodes; |
---|
| 740 | |
---|
| 741 | int first_node; |
---|
| 742 | |
---|
| 743 | int first_free_node; |
---|
| 744 | |
---|
| 745 | std::vector<EdgeT> edges; |
---|
| 746 | |
---|
| 747 | int first_free_edge; |
---|
| 748 | |
---|
| 749 | public: |
---|
| 750 | |
---|
| 751 | typedef ListUGraphBase Graph; |
---|
[2343] | 752 | |
---|
| 753 | class Node; |
---|
| 754 | class Edge; |
---|
| 755 | class UEdge; |
---|
[2338] | 756 | |
---|
| 757 | class Node { |
---|
| 758 | friend class ListUGraphBase; |
---|
| 759 | protected: |
---|
| 760 | |
---|
| 761 | int id; |
---|
| 762 | explicit Node(int pid) { id = pid;} |
---|
| 763 | |
---|
| 764 | public: |
---|
| 765 | Node() {} |
---|
| 766 | Node (Invalid) { id = -1; } |
---|
| 767 | bool operator==(const Node& node) const {return id == node.id;} |
---|
| 768 | bool operator!=(const Node& node) const {return id != node.id;} |
---|
| 769 | bool operator<(const Node& node) const {return id < node.id;} |
---|
| 770 | }; |
---|
| 771 | |
---|
| 772 | class UEdge { |
---|
| 773 | friend class ListUGraphBase; |
---|
| 774 | protected: |
---|
| 775 | |
---|
| 776 | int id; |
---|
| 777 | explicit UEdge(int pid) { id = pid;} |
---|
| 778 | |
---|
| 779 | public: |
---|
| 780 | UEdge() {} |
---|
| 781 | UEdge (Invalid) { id = -1; } |
---|
| 782 | bool operator==(const UEdge& edge) const {return id == edge.id;} |
---|
| 783 | bool operator!=(const UEdge& edge) const {return id != edge.id;} |
---|
| 784 | bool operator<(const UEdge& edge) const {return id < edge.id;} |
---|
| 785 | }; |
---|
| 786 | |
---|
| 787 | class Edge { |
---|
| 788 | friend class ListUGraphBase; |
---|
| 789 | protected: |
---|
| 790 | |
---|
| 791 | int id; |
---|
| 792 | explicit Edge(int pid) { id = pid;} |
---|
| 793 | |
---|
| 794 | public: |
---|
[2343] | 795 | operator UEdge() const { return uEdgeFromId(id / 2); } |
---|
[2338] | 796 | |
---|
| 797 | Edge() {} |
---|
| 798 | Edge (Invalid) { id = -1; } |
---|
| 799 | bool operator==(const Edge& edge) const {return id == edge.id;} |
---|
| 800 | bool operator!=(const Edge& edge) const {return id != edge.id;} |
---|
| 801 | bool operator<(const Edge& edge) const {return id < edge.id;} |
---|
| 802 | }; |
---|
| 803 | |
---|
| 804 | |
---|
| 805 | |
---|
| 806 | ListUGraphBase() |
---|
| 807 | : nodes(), first_node(-1), |
---|
| 808 | first_free_node(-1), edges(), first_free_edge(-1) {} |
---|
| 809 | |
---|
| 810 | |
---|
| 811 | int maxNodeId() const { return nodes.size()-1; } |
---|
| 812 | int maxUEdgeId() const { return edges.size() / 2 - 1; } |
---|
| 813 | int maxEdgeId() const { return edges.size()-1; } |
---|
| 814 | |
---|
| 815 | Node source(Edge e) const { return Node(edges[e.id ^ 1].target); } |
---|
| 816 | Node target(Edge e) const { return Node(edges[e.id].target); } |
---|
| 817 | |
---|
| 818 | Node source(UEdge e) const { return Node(edges[2 * e.id].target); } |
---|
| 819 | Node target(UEdge e) const { return Node(edges[2 * e.id + 1].target); } |
---|
| 820 | |
---|
| 821 | static bool direction(Edge e) { |
---|
| 822 | return (e.id & 1) == 1; |
---|
| 823 | } |
---|
| 824 | |
---|
| 825 | static Edge direct(UEdge e, bool d) { |
---|
| 826 | return Edge(e.id * 2 + (d ? 1 : 0)); |
---|
| 827 | } |
---|
| 828 | |
---|
| 829 | void first(Node& node) const { |
---|
| 830 | node.id = first_node; |
---|
| 831 | } |
---|
| 832 | |
---|
| 833 | void next(Node& node) const { |
---|
| 834 | node.id = nodes[node.id].next; |
---|
| 835 | } |
---|
| 836 | |
---|
| 837 | void first(Edge& e) const { |
---|
| 838 | int n = first_node; |
---|
| 839 | while (n != -1 && nodes[n].first_out == -1) { |
---|
| 840 | n = nodes[n].next; |
---|
| 841 | } |
---|
| 842 | e.id = (n == -1) ? -1 : nodes[n].first_out; |
---|
| 843 | } |
---|
| 844 | |
---|
| 845 | void next(Edge& e) const { |
---|
| 846 | if (edges[e.id].next_out != -1) { |
---|
| 847 | e.id = edges[e.id].next_out; |
---|
| 848 | } else { |
---|
| 849 | int n = nodes[edges[e.id ^ 1].target].next; |
---|
| 850 | while(n != -1 && nodes[n].first_out == -1) { |
---|
| 851 | n = nodes[n].next; |
---|
| 852 | } |
---|
| 853 | e.id = (n == -1) ? -1 : nodes[n].first_out; |
---|
| 854 | } |
---|
| 855 | } |
---|
| 856 | |
---|
| 857 | void first(UEdge& e) const { |
---|
| 858 | int n = first_node; |
---|
| 859 | while (n != -1) { |
---|
| 860 | e.id = nodes[n].first_out; |
---|
| 861 | while ((e.id & 1) != 1) { |
---|
| 862 | e.id = edges[e.id].next_out; |
---|
| 863 | } |
---|
| 864 | if (e.id != -1) { |
---|
| 865 | e.id /= 2; |
---|
| 866 | return; |
---|
| 867 | } |
---|
| 868 | n = nodes[n].next; |
---|
| 869 | } |
---|
| 870 | e.id = -1; |
---|
| 871 | } |
---|
| 872 | |
---|
| 873 | void next(UEdge& e) const { |
---|
| 874 | int n = edges[e.id * 2].target; |
---|
| 875 | e.id = edges[(e.id * 2) | 1].next_out; |
---|
| 876 | while ((e.id & 1) != 1) { |
---|
| 877 | e.id = edges[e.id].next_out; |
---|
| 878 | } |
---|
| 879 | if (e.id != -1) { |
---|
| 880 | e.id /= 2; |
---|
| 881 | return; |
---|
| 882 | } |
---|
| 883 | n = nodes[n].next; |
---|
| 884 | while (n != -1) { |
---|
| 885 | e.id = nodes[n].first_out; |
---|
| 886 | while ((e.id & 1) != 1) { |
---|
| 887 | e.id = edges[e.id].next_out; |
---|
| 888 | } |
---|
| 889 | if (e.id != -1) { |
---|
| 890 | e.id /= 2; |
---|
| 891 | return; |
---|
| 892 | } |
---|
| 893 | n = nodes[n].next; |
---|
| 894 | } |
---|
| 895 | e.id = -1; |
---|
| 896 | } |
---|
| 897 | |
---|
| 898 | void firstOut(Edge &e, const Node& v) const { |
---|
| 899 | e.id = nodes[v.id].first_out; |
---|
| 900 | } |
---|
| 901 | void nextOut(Edge &e) const { |
---|
| 902 | e.id = edges[e.id].next_out; |
---|
| 903 | } |
---|
| 904 | |
---|
| 905 | void firstIn(Edge &e, const Node& v) const { |
---|
| 906 | e.id = ((nodes[v.id].first_out) ^ 1); |
---|
| 907 | if (e.id == -2) e.id = -1; |
---|
| 908 | } |
---|
| 909 | void nextIn(Edge &e) const { |
---|
| 910 | e.id = ((edges[e.id ^ 1].next_out) ^ 1); |
---|
| 911 | if (e.id == -2) e.id = -1; |
---|
| 912 | } |
---|
| 913 | |
---|
| 914 | void firstInc(UEdge &e, bool& d, const Node& v) const { |
---|
| 915 | int de = nodes[v.id].first_out; |
---|
[2381] | 916 | if (de != -1 ) { |
---|
| 917 | e.id = de / 2; |
---|
| 918 | d = ((de & 1) == 1); |
---|
| 919 | } else { |
---|
| 920 | e.id = -1; |
---|
| 921 | d = true; |
---|
| 922 | } |
---|
[2338] | 923 | } |
---|
| 924 | void nextInc(UEdge &e, bool& d) const { |
---|
| 925 | int de = (edges[(e.id * 2) | (d ? 1 : 0)].next_out); |
---|
[2381] | 926 | if (de != -1 ) { |
---|
| 927 | e.id = de / 2; |
---|
| 928 | d = ((de & 1) == 1); |
---|
| 929 | } else { |
---|
| 930 | e.id = -1; |
---|
| 931 | d = true; |
---|
| 932 | } |
---|
[2338] | 933 | } |
---|
| 934 | |
---|
| 935 | static int id(Node v) { return v.id; } |
---|
| 936 | static int id(Edge e) { return e.id; } |
---|
| 937 | static int id(UEdge e) { return e.id; } |
---|
| 938 | |
---|
| 939 | static Node nodeFromId(int id) { return Node(id);} |
---|
| 940 | static Edge edgeFromId(int id) { return Edge(id);} |
---|
| 941 | static UEdge uEdgeFromId(int id) { return UEdge(id);} |
---|
| 942 | |
---|
| 943 | Node addNode() { |
---|
| 944 | int n; |
---|
| 945 | |
---|
| 946 | if(first_free_node==-1) { |
---|
| 947 | n = nodes.size(); |
---|
| 948 | nodes.push_back(NodeT()); |
---|
| 949 | } else { |
---|
| 950 | n = first_free_node; |
---|
| 951 | first_free_node = nodes[n].next; |
---|
| 952 | } |
---|
| 953 | |
---|
| 954 | nodes[n].next = first_node; |
---|
| 955 | if (first_node != -1) nodes[first_node].prev = n; |
---|
| 956 | first_node = n; |
---|
| 957 | nodes[n].prev = -1; |
---|
| 958 | |
---|
| 959 | nodes[n].first_out = -1; |
---|
| 960 | |
---|
| 961 | return Node(n); |
---|
| 962 | } |
---|
| 963 | |
---|
| 964 | UEdge addEdge(Node u, Node v) { |
---|
| 965 | int n; |
---|
| 966 | |
---|
| 967 | if (first_free_edge == -1) { |
---|
| 968 | n = edges.size(); |
---|
| 969 | edges.push_back(EdgeT()); |
---|
| 970 | edges.push_back(EdgeT()); |
---|
| 971 | } else { |
---|
| 972 | n = first_free_edge; |
---|
| 973 | first_free_edge = edges[n].next_out; |
---|
| 974 | } |
---|
| 975 | |
---|
| 976 | edges[n].target = u.id; |
---|
| 977 | edges[n | 1].target = v.id; |
---|
| 978 | |
---|
| 979 | edges[n].next_out = nodes[v.id].first_out; |
---|
| 980 | if (nodes[v.id].first_out != -1) { |
---|
| 981 | edges[nodes[v.id].first_out].prev_out = n; |
---|
[2498] | 982 | } |
---|
| 983 | edges[n].prev_out = -1; |
---|
| 984 | nodes[v.id].first_out = n; |
---|
| 985 | |
---|
| 986 | edges[n | 1].next_out = nodes[u.id].first_out; |
---|
[2338] | 987 | if (nodes[u.id].first_out != -1) { |
---|
| 988 | edges[nodes[u.id].first_out].prev_out = (n | 1); |
---|
| 989 | } |
---|
[2498] | 990 | edges[n | 1].prev_out = -1; |
---|
[2338] | 991 | nodes[u.id].first_out = (n | 1); |
---|
| 992 | |
---|
| 993 | return UEdge(n / 2); |
---|
| 994 | } |
---|
| 995 | |
---|
| 996 | void erase(const Node& node) { |
---|
| 997 | int n = node.id; |
---|
| 998 | |
---|
| 999 | if(nodes[n].next != -1) { |
---|
| 1000 | nodes[nodes[n].next].prev = nodes[n].prev; |
---|
| 1001 | } |
---|
| 1002 | |
---|
| 1003 | if(nodes[n].prev != -1) { |
---|
| 1004 | nodes[nodes[n].prev].next = nodes[n].next; |
---|
| 1005 | } else { |
---|
| 1006 | first_node = nodes[n].next; |
---|
| 1007 | } |
---|
| 1008 | |
---|
| 1009 | nodes[n].next = first_free_node; |
---|
| 1010 | first_free_node = n; |
---|
| 1011 | |
---|
| 1012 | } |
---|
| 1013 | |
---|
| 1014 | void erase(const UEdge& edge) { |
---|
| 1015 | int n = edge.id * 2; |
---|
| 1016 | |
---|
| 1017 | if (edges[n].next_out != -1) { |
---|
| 1018 | edges[edges[n].next_out].prev_out = edges[n].prev_out; |
---|
| 1019 | } |
---|
| 1020 | |
---|
| 1021 | if (edges[n].prev_out != -1) { |
---|
| 1022 | edges[edges[n].prev_out].next_out = edges[n].next_out; |
---|
| 1023 | } else { |
---|
| 1024 | nodes[edges[n | 1].target].first_out = edges[n].next_out; |
---|
| 1025 | } |
---|
| 1026 | |
---|
| 1027 | if (edges[n | 1].next_out != -1) { |
---|
| 1028 | edges[edges[n | 1].next_out].prev_out = edges[n | 1].prev_out; |
---|
| 1029 | } |
---|
| 1030 | |
---|
| 1031 | if (edges[n | 1].prev_out != -1) { |
---|
| 1032 | edges[edges[n | 1].prev_out].next_out = edges[n | 1].next_out; |
---|
| 1033 | } else { |
---|
| 1034 | nodes[edges[n].target].first_out = edges[n | 1].next_out; |
---|
| 1035 | } |
---|
| 1036 | |
---|
| 1037 | edges[n].next_out = first_free_edge; |
---|
| 1038 | first_free_edge = n; |
---|
| 1039 | |
---|
| 1040 | } |
---|
| 1041 | |
---|
| 1042 | void clear() { |
---|
| 1043 | edges.clear(); |
---|
| 1044 | nodes.clear(); |
---|
| 1045 | first_node = first_free_node = first_free_edge = -1; |
---|
| 1046 | } |
---|
| 1047 | |
---|
| 1048 | protected: |
---|
| 1049 | |
---|
| 1050 | void changeTarget(UEdge e, Node n) { |
---|
| 1051 | if(edges[2 * e.id].next_out != -1) { |
---|
| 1052 | edges[edges[2 * e.id].next_out].prev_out = edges[2 * e.id].prev_out; |
---|
| 1053 | } |
---|
| 1054 | if(edges[2 * e.id].prev_out != -1) { |
---|
| 1055 | edges[edges[2 * e.id].prev_out].next_out = |
---|
| 1056 | edges[2 * e.id].next_out; |
---|
| 1057 | } else { |
---|
| 1058 | nodes[edges[(2 * e.id) | 1].target].first_out = |
---|
| 1059 | edges[2 * e.id].next_out; |
---|
| 1060 | } |
---|
| 1061 | |
---|
| 1062 | if (nodes[n.id].first_out != -1) { |
---|
| 1063 | edges[nodes[n.id].first_out].prev_out = 2 * e.id; |
---|
| 1064 | } |
---|
| 1065 | edges[(2 * e.id) | 1].target = n.id; |
---|
| 1066 | edges[2 * e.id].prev_out = -1; |
---|
| 1067 | edges[2 * e.id].next_out = nodes[n.id].first_out; |
---|
| 1068 | nodes[n.id].first_out = 2 * e.id; |
---|
| 1069 | } |
---|
| 1070 | |
---|
| 1071 | void changeSource(UEdge e, Node n) { |
---|
| 1072 | if(edges[(2 * e.id) | 1].next_out != -1) { |
---|
| 1073 | edges[edges[(2 * e.id) | 1].next_out].prev_out = |
---|
| 1074 | edges[(2 * e.id) | 1].prev_out; |
---|
| 1075 | } |
---|
| 1076 | if(edges[(2 * e.id) | 1].prev_out != -1) { |
---|
| 1077 | edges[edges[(2 * e.id) | 1].prev_out].next_out = |
---|
| 1078 | edges[(2 * e.id) | 1].next_out; |
---|
| 1079 | } else { |
---|
| 1080 | nodes[edges[2 * e.id].target].first_out = |
---|
| 1081 | edges[(2 * e.id) | 1].next_out; |
---|
| 1082 | } |
---|
| 1083 | |
---|
| 1084 | if (nodes[n.id].first_out != -1) { |
---|
| 1085 | edges[nodes[n.id].first_out].prev_out = ((2 * e.id) | 1); |
---|
| 1086 | } |
---|
| 1087 | edges[2 * e.id].target = n.id; |
---|
| 1088 | edges[(2 * e.id) | 1].prev_out = -1; |
---|
| 1089 | edges[(2 * e.id) | 1].next_out = nodes[n.id].first_out; |
---|
| 1090 | nodes[n.id].first_out = ((2 * e.id) | 1); |
---|
| 1091 | } |
---|
| 1092 | |
---|
| 1093 | }; |
---|
| 1094 | |
---|
| 1095 | // typedef UGraphExtender<UndirGraphExtender<ListGraphBase> > |
---|
| 1096 | // ExtendedListUGraphBase; |
---|
| 1097 | |
---|
| 1098 | typedef UGraphExtender<ListUGraphBase> ExtendedListUGraphBase; |
---|
| 1099 | |
---|
| 1100 | |
---|
[2116] | 1101 | |
---|
| 1102 | /// \addtogroup graphs |
---|
| 1103 | /// @{ |
---|
| 1104 | |
---|
| 1105 | ///An undirected list graph class. |
---|
| 1106 | |
---|
[2117] | 1107 | ///This is a simple and fast undirected graph implementation. |
---|
[2116] | 1108 | /// |
---|
[2256] | 1109 | ///An important extra feature of this graph implementation is that |
---|
[2260] | 1110 | ///its maps are real \ref concepts::ReferenceMap "reference map"s. |
---|
[2256] | 1111 | /// |
---|
[2116] | 1112 | ///It conforms to the |
---|
[2260] | 1113 | ///\ref concepts::UGraph "UGraph concept". |
---|
[2116] | 1114 | /// |
---|
[2260] | 1115 | ///\sa concepts::UGraph. |
---|
[2116] | 1116 | /// |
---|
| 1117 | class ListUGraph : public ExtendedListUGraphBase { |
---|
[2128] | 1118 | private: |
---|
| 1119 | ///ListUGraph is \e not copy constructible. Use UGraphCopy() instead. |
---|
| 1120 | |
---|
| 1121 | ///ListUGraph is \e not copy constructible. Use UGraphCopy() instead. |
---|
| 1122 | /// |
---|
| 1123 | ListUGraph(const ListUGraph &) :ExtendedListUGraphBase() {}; |
---|
[2132] | 1124 | ///\brief Assignment of ListUGraph to another one is \e not allowed. |
---|
[2128] | 1125 | ///Use UGraphCopy() instead. |
---|
| 1126 | |
---|
[2132] | 1127 | ///Assignment of ListUGraph to another one is \e not allowed. |
---|
[2128] | 1128 | ///Use UGraphCopy() instead. |
---|
| 1129 | void operator=(const ListUGraph &) {} |
---|
[2116] | 1130 | public: |
---|
[2128] | 1131 | /// Constructor |
---|
| 1132 | |
---|
| 1133 | /// Constructor. |
---|
| 1134 | /// |
---|
| 1135 | ListUGraph() {} |
---|
| 1136 | |
---|
[2116] | 1137 | typedef ExtendedListUGraphBase Parent; |
---|
[2338] | 1138 | |
---|
| 1139 | typedef Parent::OutEdgeIt IncEdgeIt; |
---|
| 1140 | |
---|
[2116] | 1141 | /// \brief Add a new node to the graph. |
---|
| 1142 | /// |
---|
| 1143 | /// \return the new node. |
---|
| 1144 | /// |
---|
| 1145 | Node addNode() { return Parent::addNode(); } |
---|
| 1146 | |
---|
| 1147 | /// \brief Add a new edge to the graph. |
---|
| 1148 | /// |
---|
| 1149 | /// Add a new edge to the graph with source node \c s |
---|
| 1150 | /// and target node \c t. |
---|
| 1151 | /// \return the new undirected edge. |
---|
| 1152 | UEdge addEdge(const Node& s, const Node& t) { |
---|
| 1153 | return Parent::addEdge(s, t); |
---|
| 1154 | } |
---|
[2160] | 1155 | /// \brief Changes the source of \c e to \c n |
---|
| 1156 | /// |
---|
| 1157 | /// Changes the source of \c e to \c n |
---|
| 1158 | /// |
---|
| 1159 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
| 1160 | ///referencing the changed edge remain |
---|
| 1161 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 1162 | void changeSource(UEdge e, Node n) { |
---|
| 1163 | Parent::changeSource(e,n); |
---|
| 1164 | } |
---|
[2116] | 1165 | /// \brief Changes the target of \c e to \c n |
---|
| 1166 | /// |
---|
| 1167 | /// Changes the target of \c e to \c n |
---|
| 1168 | /// |
---|
[2160] | 1169 | /// \note The <tt>EdgeIt</tt>s referencing the changed edge remain |
---|
| 1170 | /// valid. However the other iterators may be invalidated. |
---|
[2116] | 1171 | void changeTarget(UEdge e, Node n) { |
---|
| 1172 | Parent::changeTarget(e,n); |
---|
| 1173 | } |
---|
[2160] | 1174 | /// \brief Changes the source of \c e to \c n |
---|
[2116] | 1175 | /// |
---|
[2160] | 1176 | /// Changes the source of \c e to \c n. It changes the proper |
---|
| 1177 | /// node of the represented undirected edge. |
---|
[2116] | 1178 | /// |
---|
[2160] | 1179 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
[2116] | 1180 | ///referencing the changed edge remain |
---|
[2160] | 1181 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 1182 | void changeSource(Edge e, Node n) { |
---|
| 1183 | if (Parent::direction(e)) { |
---|
| 1184 | Parent::changeSource(e,n); |
---|
| 1185 | } else { |
---|
| 1186 | Parent::changeTarget(e,n); |
---|
| 1187 | } |
---|
| 1188 | } |
---|
| 1189 | /// \brief Changes the target of \c e to \c n |
---|
| 1190 | /// |
---|
| 1191 | /// Changes the target of \c e to \c n. It changes the proper |
---|
| 1192 | /// node of the represented undirected edge. |
---|
| 1193 | /// |
---|
| 1194 | ///\note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1195 | ///referencing the changed edge remain |
---|
| 1196 | ///valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1197 | void changeTarget(Edge e, Node n) { |
---|
| 1198 | if (Parent::direction(e)) { |
---|
| 1199 | Parent::changeTarget(e,n); |
---|
| 1200 | } else { |
---|
| 1201 | Parent::changeSource(e,n); |
---|
| 1202 | } |
---|
[2116] | 1203 | } |
---|
| 1204 | /// \brief Contract two nodes. |
---|
| 1205 | /// |
---|
| 1206 | /// This function contracts two nodes. |
---|
| 1207 | /// |
---|
| 1208 | /// Node \p b will be removed but instead of deleting |
---|
| 1209 | /// its neighboring edges, they will be joined to \p a. |
---|
| 1210 | /// The last parameter \p r controls whether to remove loops. \c true |
---|
| 1211 | /// means that loops will be removed. |
---|
| 1212 | /// |
---|
[2160] | 1213 | /// \note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
[2116] | 1214 | /// valid. |
---|
| 1215 | void contract(Node a, Node b, bool r = true) { |
---|
| 1216 | for(IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 1217 | IncEdgeIt f = e; ++f; |
---|
| 1218 | if (r && runningNode(e) == a) { |
---|
| 1219 | erase(e); |
---|
| 1220 | } else if (source(e) == b) { |
---|
| 1221 | changeSource(e, a); |
---|
| 1222 | } else { |
---|
| 1223 | changeTarget(e, a); |
---|
| 1224 | } |
---|
| 1225 | e = f; |
---|
| 1226 | } |
---|
| 1227 | erase(b); |
---|
| 1228 | } |
---|
[2189] | 1229 | |
---|
| 1230 | |
---|
| 1231 | /// \brief Class to make a snapshot of the graph and restore |
---|
| 1232 | /// to it later. |
---|
| 1233 | /// |
---|
| 1234 | /// Class to make a snapshot of the graph and to restore it |
---|
| 1235 | /// later. |
---|
| 1236 | /// |
---|
| 1237 | /// The newly added nodes and undirected edges can be removed |
---|
| 1238 | /// using the restore() function. |
---|
| 1239 | /// |
---|
| 1240 | /// \warning Edge and node deletions cannot be restored. This |
---|
| 1241 | /// events invalidate the snapshot. |
---|
| 1242 | class Snapshot { |
---|
| 1243 | protected: |
---|
| 1244 | |
---|
| 1245 | typedef Parent::NodeNotifier NodeNotifier; |
---|
| 1246 | |
---|
| 1247 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
| 1248 | public: |
---|
| 1249 | |
---|
| 1250 | NodeObserverProxy(Snapshot& _snapshot) |
---|
| 1251 | : snapshot(_snapshot) {} |
---|
| 1252 | |
---|
| 1253 | using NodeNotifier::ObserverBase::attach; |
---|
| 1254 | using NodeNotifier::ObserverBase::detach; |
---|
| 1255 | using NodeNotifier::ObserverBase::attached; |
---|
| 1256 | |
---|
| 1257 | protected: |
---|
| 1258 | |
---|
| 1259 | virtual void add(const Node& node) { |
---|
| 1260 | snapshot.addNode(node); |
---|
| 1261 | } |
---|
| 1262 | virtual void add(const std::vector<Node>& nodes) { |
---|
| 1263 | for (int i = nodes.size() - 1; i >= 0; ++i) { |
---|
| 1264 | snapshot.addNode(nodes[i]); |
---|
| 1265 | } |
---|
| 1266 | } |
---|
| 1267 | virtual void erase(const Node& node) { |
---|
| 1268 | snapshot.eraseNode(node); |
---|
| 1269 | } |
---|
| 1270 | virtual void erase(const std::vector<Node>& nodes) { |
---|
[2386] | 1271 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
[2189] | 1272 | snapshot.eraseNode(nodes[i]); |
---|
| 1273 | } |
---|
| 1274 | } |
---|
| 1275 | virtual void build() { |
---|
| 1276 | Node node; |
---|
| 1277 | std::vector<Node> nodes; |
---|
[2386] | 1278 | for (notifier()->first(node); node != INVALID; |
---|
| 1279 | notifier()->next(node)) { |
---|
[2189] | 1280 | nodes.push_back(node); |
---|
| 1281 | } |
---|
| 1282 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
| 1283 | snapshot.addNode(nodes[i]); |
---|
| 1284 | } |
---|
| 1285 | } |
---|
| 1286 | virtual void clear() { |
---|
| 1287 | Node node; |
---|
[2386] | 1288 | for (notifier()->first(node); node != INVALID; |
---|
| 1289 | notifier()->next(node)) { |
---|
[2189] | 1290 | snapshot.eraseNode(node); |
---|
| 1291 | } |
---|
| 1292 | } |
---|
| 1293 | |
---|
| 1294 | Snapshot& snapshot; |
---|
| 1295 | }; |
---|
| 1296 | |
---|
| 1297 | class UEdgeObserverProxy : public UEdgeNotifier::ObserverBase { |
---|
| 1298 | public: |
---|
| 1299 | |
---|
| 1300 | UEdgeObserverProxy(Snapshot& _snapshot) |
---|
| 1301 | : snapshot(_snapshot) {} |
---|
| 1302 | |
---|
| 1303 | using UEdgeNotifier::ObserverBase::attach; |
---|
| 1304 | using UEdgeNotifier::ObserverBase::detach; |
---|
| 1305 | using UEdgeNotifier::ObserverBase::attached; |
---|
| 1306 | |
---|
| 1307 | protected: |
---|
| 1308 | |
---|
| 1309 | virtual void add(const UEdge& edge) { |
---|
| 1310 | snapshot.addUEdge(edge); |
---|
| 1311 | } |
---|
| 1312 | virtual void add(const std::vector<UEdge>& edges) { |
---|
| 1313 | for (int i = edges.size() - 1; i >= 0; ++i) { |
---|
| 1314 | snapshot.addUEdge(edges[i]); |
---|
| 1315 | } |
---|
| 1316 | } |
---|
| 1317 | virtual void erase(const UEdge& edge) { |
---|
| 1318 | snapshot.eraseUEdge(edge); |
---|
| 1319 | } |
---|
| 1320 | virtual void erase(const std::vector<UEdge>& edges) { |
---|
[2386] | 1321 | for (int i = 0; i < int(edges.size()); ++i) { |
---|
[2189] | 1322 | snapshot.eraseUEdge(edges[i]); |
---|
| 1323 | } |
---|
| 1324 | } |
---|
| 1325 | virtual void build() { |
---|
| 1326 | UEdge edge; |
---|
| 1327 | std::vector<UEdge> edges; |
---|
[2386] | 1328 | for (notifier()->first(edge); edge != INVALID; |
---|
| 1329 | notifier()->next(edge)) { |
---|
[2189] | 1330 | edges.push_back(edge); |
---|
| 1331 | } |
---|
| 1332 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
| 1333 | snapshot.addUEdge(edges[i]); |
---|
| 1334 | } |
---|
| 1335 | } |
---|
| 1336 | virtual void clear() { |
---|
| 1337 | UEdge edge; |
---|
[2386] | 1338 | for (notifier()->first(edge); edge != INVALID; |
---|
| 1339 | notifier()->next(edge)) { |
---|
[2189] | 1340 | snapshot.eraseUEdge(edge); |
---|
| 1341 | } |
---|
| 1342 | } |
---|
| 1343 | |
---|
| 1344 | Snapshot& snapshot; |
---|
| 1345 | }; |
---|
| 1346 | |
---|
| 1347 | ListUGraph *graph; |
---|
| 1348 | |
---|
| 1349 | NodeObserverProxy node_observer_proxy; |
---|
| 1350 | UEdgeObserverProxy edge_observer_proxy; |
---|
| 1351 | |
---|
| 1352 | std::list<Node> added_nodes; |
---|
| 1353 | std::list<UEdge> added_edges; |
---|
| 1354 | |
---|
| 1355 | |
---|
| 1356 | void addNode(const Node& node) { |
---|
| 1357 | added_nodes.push_front(node); |
---|
| 1358 | } |
---|
| 1359 | void eraseNode(const Node& node) { |
---|
| 1360 | std::list<Node>::iterator it = |
---|
| 1361 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
| 1362 | if (it == added_nodes.end()) { |
---|
| 1363 | clear(); |
---|
| 1364 | edge_observer_proxy.detach(); |
---|
| 1365 | throw NodeNotifier::ImmediateDetach(); |
---|
| 1366 | } else { |
---|
| 1367 | added_nodes.erase(it); |
---|
| 1368 | } |
---|
| 1369 | } |
---|
| 1370 | |
---|
| 1371 | void addUEdge(const UEdge& edge) { |
---|
| 1372 | added_edges.push_front(edge); |
---|
| 1373 | } |
---|
| 1374 | void eraseUEdge(const UEdge& edge) { |
---|
| 1375 | std::list<UEdge>::iterator it = |
---|
| 1376 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
| 1377 | if (it == added_edges.end()) { |
---|
| 1378 | clear(); |
---|
| 1379 | node_observer_proxy.detach(); |
---|
| 1380 | throw UEdgeNotifier::ImmediateDetach(); |
---|
| 1381 | } else { |
---|
| 1382 | added_edges.erase(it); |
---|
| 1383 | } |
---|
| 1384 | } |
---|
| 1385 | |
---|
| 1386 | void attach(ListUGraph &_graph) { |
---|
| 1387 | graph = &_graph; |
---|
[2381] | 1388 | node_observer_proxy.attach(graph->notifier(Node())); |
---|
| 1389 | edge_observer_proxy.attach(graph->notifier(UEdge())); |
---|
[2189] | 1390 | } |
---|
| 1391 | |
---|
| 1392 | void detach() { |
---|
| 1393 | node_observer_proxy.detach(); |
---|
| 1394 | edge_observer_proxy.detach(); |
---|
| 1395 | } |
---|
| 1396 | |
---|
| 1397 | bool attached() const { |
---|
| 1398 | return node_observer_proxy.attached(); |
---|
| 1399 | } |
---|
| 1400 | |
---|
| 1401 | void clear() { |
---|
| 1402 | added_nodes.clear(); |
---|
| 1403 | added_edges.clear(); |
---|
| 1404 | } |
---|
| 1405 | |
---|
| 1406 | public: |
---|
| 1407 | |
---|
| 1408 | /// \brief Default constructor. |
---|
| 1409 | /// |
---|
| 1410 | /// Default constructor. |
---|
| 1411 | /// To actually make a snapshot you must call save(). |
---|
| 1412 | Snapshot() |
---|
| 1413 | : graph(0), node_observer_proxy(*this), |
---|
| 1414 | edge_observer_proxy(*this) {} |
---|
| 1415 | |
---|
| 1416 | /// \brief Constructor that immediately makes a snapshot. |
---|
| 1417 | /// |
---|
| 1418 | /// This constructor immediately makes a snapshot of the graph. |
---|
| 1419 | /// \param _graph The graph we make a snapshot of. |
---|
| 1420 | Snapshot(ListUGraph &_graph) |
---|
| 1421 | : node_observer_proxy(*this), |
---|
| 1422 | edge_observer_proxy(*this) { |
---|
| 1423 | attach(_graph); |
---|
| 1424 | } |
---|
| 1425 | |
---|
| 1426 | /// \brief Make a snapshot. |
---|
| 1427 | /// |
---|
| 1428 | /// Make a snapshot of the graph. |
---|
| 1429 | /// |
---|
| 1430 | /// This function can be called more than once. In case of a repeated |
---|
| 1431 | /// call, the previous snapshot gets lost. |
---|
| 1432 | /// \param _graph The graph we make the snapshot of. |
---|
| 1433 | void save(ListUGraph &_graph) { |
---|
| 1434 | if (attached()) { |
---|
| 1435 | detach(); |
---|
| 1436 | clear(); |
---|
| 1437 | } |
---|
| 1438 | attach(_graph); |
---|
| 1439 | } |
---|
| 1440 | |
---|
| 1441 | /// \brief Undo the changes until the last snapshot. |
---|
| 1442 | // |
---|
| 1443 | /// Undo the changes until the last snapshot created by save(). |
---|
| 1444 | void restore() { |
---|
| 1445 | detach(); |
---|
| 1446 | for(std::list<UEdge>::iterator it = added_edges.begin(); |
---|
| 1447 | it != added_edges.end(); ++it) { |
---|
| 1448 | graph->erase(*it); |
---|
| 1449 | } |
---|
| 1450 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
| 1451 | it != added_nodes.end(); ++it) { |
---|
| 1452 | graph->erase(*it); |
---|
| 1453 | } |
---|
| 1454 | clear(); |
---|
| 1455 | } |
---|
| 1456 | |
---|
| 1457 | /// \brief Gives back true when the snapshot is valid. |
---|
| 1458 | /// |
---|
| 1459 | /// Gives back true when the snapshot is valid. |
---|
| 1460 | bool valid() const { |
---|
| 1461 | return attached(); |
---|
| 1462 | } |
---|
| 1463 | }; |
---|
[2116] | 1464 | }; |
---|
| 1465 | |
---|
| 1466 | |
---|
| 1467 | class ListBpUGraphBase { |
---|
| 1468 | public: |
---|
| 1469 | |
---|
| 1470 | class NodeSetError : public LogicError { |
---|
[2160] | 1471 | public: |
---|
[2151] | 1472 | virtual const char* what() const throw() { |
---|
[2116] | 1473 | return "lemon::ListBpUGraph::NodeSetError"; |
---|
| 1474 | } |
---|
| 1475 | }; |
---|
| 1476 | |
---|
| 1477 | protected: |
---|
| 1478 | |
---|
| 1479 | struct NodeT { |
---|
| 1480 | int first_edge, prev, next; |
---|
| 1481 | }; |
---|
| 1482 | |
---|
| 1483 | struct UEdgeT { |
---|
| 1484 | int aNode, prev_out, next_out; |
---|
| 1485 | int bNode, prev_in, next_in; |
---|
| 1486 | }; |
---|
| 1487 | |
---|
| 1488 | std::vector<NodeT> aNodes; |
---|
| 1489 | std::vector<NodeT> bNodes; |
---|
| 1490 | |
---|
| 1491 | std::vector<UEdgeT> edges; |
---|
| 1492 | |
---|
| 1493 | int first_anode; |
---|
| 1494 | int first_free_anode; |
---|
| 1495 | |
---|
| 1496 | int first_bnode; |
---|
| 1497 | int first_free_bnode; |
---|
| 1498 | |
---|
| 1499 | int first_free_edge; |
---|
| 1500 | |
---|
| 1501 | public: |
---|
| 1502 | |
---|
| 1503 | class Node { |
---|
| 1504 | friend class ListBpUGraphBase; |
---|
| 1505 | protected: |
---|
| 1506 | int id; |
---|
| 1507 | |
---|
| 1508 | explicit Node(int _id) : id(_id) {} |
---|
| 1509 | public: |
---|
| 1510 | Node() {} |
---|
| 1511 | Node(Invalid) { id = -1; } |
---|
| 1512 | bool operator==(const Node i) const {return id==i.id;} |
---|
| 1513 | bool operator!=(const Node i) const {return id!=i.id;} |
---|
| 1514 | bool operator<(const Node i) const {return id<i.id;} |
---|
| 1515 | }; |
---|
| 1516 | |
---|
| 1517 | class UEdge { |
---|
| 1518 | friend class ListBpUGraphBase; |
---|
| 1519 | protected: |
---|
| 1520 | int id; |
---|
| 1521 | |
---|
| 1522 | explicit UEdge(int _id) { id = _id;} |
---|
| 1523 | public: |
---|
| 1524 | UEdge() {} |
---|
| 1525 | UEdge (Invalid) { id = -1; } |
---|
| 1526 | bool operator==(const UEdge i) const {return id==i.id;} |
---|
| 1527 | bool operator!=(const UEdge i) const {return id!=i.id;} |
---|
| 1528 | bool operator<(const UEdge i) const {return id<i.id;} |
---|
| 1529 | }; |
---|
| 1530 | |
---|
| 1531 | ListBpUGraphBase() |
---|
| 1532 | : first_anode(-1), first_free_anode(-1), |
---|
| 1533 | first_bnode(-1), first_free_bnode(-1), |
---|
| 1534 | first_free_edge(-1) {} |
---|
| 1535 | |
---|
| 1536 | void firstANode(Node& node) const { |
---|
| 1537 | node.id = first_anode != -1 ? (first_anode << 1) : -1; |
---|
| 1538 | } |
---|
| 1539 | void nextANode(Node& node) const { |
---|
| 1540 | node.id = aNodes[node.id >> 1].next; |
---|
| 1541 | } |
---|
| 1542 | |
---|
| 1543 | void firstBNode(Node& node) const { |
---|
| 1544 | node.id = first_bnode != -1 ? (first_bnode << 1) + 1 : -1; |
---|
| 1545 | } |
---|
| 1546 | void nextBNode(Node& node) const { |
---|
| 1547 | node.id = bNodes[node.id >> 1].next; |
---|
| 1548 | } |
---|
| 1549 | |
---|
| 1550 | void first(Node& node) const { |
---|
| 1551 | if (first_anode != -1) { |
---|
| 1552 | node.id = (first_anode << 1); |
---|
| 1553 | } else if (first_bnode != -1) { |
---|
| 1554 | node.id = (first_bnode << 1) + 1; |
---|
| 1555 | } else { |
---|
| 1556 | node.id = -1; |
---|
| 1557 | } |
---|
| 1558 | } |
---|
| 1559 | void next(Node& node) const { |
---|
| 1560 | if (aNode(node)) { |
---|
| 1561 | node.id = aNodes[node.id >> 1].next; |
---|
| 1562 | if (node.id == -1) { |
---|
| 1563 | if (first_bnode != -1) { |
---|
| 1564 | node.id = (first_bnode << 1) + 1; |
---|
| 1565 | } |
---|
| 1566 | } |
---|
| 1567 | } else { |
---|
| 1568 | node.id = bNodes[node.id >> 1].next; |
---|
| 1569 | } |
---|
| 1570 | } |
---|
| 1571 | |
---|
| 1572 | void first(UEdge& edge) const { |
---|
[2386] | 1573 | int aid = first_anode; |
---|
| 1574 | while (aid != -1 && aNodes[aid].first_edge == -1) { |
---|
| 1575 | aid = aNodes[aid].next != -1 ? |
---|
| 1576 | aNodes[aid].next >> 1 : -1; |
---|
[2116] | 1577 | } |
---|
[2386] | 1578 | if (aid != -1) { |
---|
| 1579 | edge.id = aNodes[aid].first_edge; |
---|
[2116] | 1580 | } else { |
---|
| 1581 | edge.id = -1; |
---|
| 1582 | } |
---|
| 1583 | } |
---|
| 1584 | void next(UEdge& edge) const { |
---|
[2386] | 1585 | int aid = edges[edge.id].aNode >> 1; |
---|
[2116] | 1586 | edge.id = edges[edge.id].next_out; |
---|
| 1587 | if (edge.id == -1) { |
---|
[2386] | 1588 | aid = aNodes[aid].next != -1 ? |
---|
| 1589 | aNodes[aid].next >> 1 : -1; |
---|
| 1590 | while (aid != -1 && aNodes[aid].first_edge == -1) { |
---|
| 1591 | aid = aNodes[aid].next != -1 ? |
---|
| 1592 | aNodes[aid].next >> 1 : -1; |
---|
[2116] | 1593 | } |
---|
[2386] | 1594 | if (aid != -1) { |
---|
| 1595 | edge.id = aNodes[aid].first_edge; |
---|
[2116] | 1596 | } else { |
---|
| 1597 | edge.id = -1; |
---|
| 1598 | } |
---|
| 1599 | } |
---|
| 1600 | } |
---|
| 1601 | |
---|
| 1602 | void firstFromANode(UEdge& edge, const Node& node) const { |
---|
| 1603 | LEMON_ASSERT((node.id & 1) == 0, NodeSetError()); |
---|
| 1604 | edge.id = aNodes[node.id >> 1].first_edge; |
---|
| 1605 | } |
---|
| 1606 | void nextFromANode(UEdge& edge) const { |
---|
| 1607 | edge.id = edges[edge.id].next_out; |
---|
| 1608 | } |
---|
| 1609 | |
---|
| 1610 | void firstFromBNode(UEdge& edge, const Node& node) const { |
---|
| 1611 | LEMON_ASSERT((node.id & 1) == 1, NodeSetError()); |
---|
| 1612 | edge.id = bNodes[node.id >> 1].first_edge; |
---|
| 1613 | } |
---|
| 1614 | void nextFromBNode(UEdge& edge) const { |
---|
| 1615 | edge.id = edges[edge.id].next_in; |
---|
| 1616 | } |
---|
| 1617 | |
---|
| 1618 | static int id(const Node& node) { |
---|
| 1619 | return node.id; |
---|
| 1620 | } |
---|
| 1621 | static Node nodeFromId(int id) { |
---|
| 1622 | return Node(id); |
---|
| 1623 | } |
---|
| 1624 | int maxNodeId() const { |
---|
| 1625 | return aNodes.size() > bNodes.size() ? |
---|
| 1626 | aNodes.size() * 2 - 2 : bNodes.size() * 2 - 1; |
---|
| 1627 | } |
---|
| 1628 | |
---|
| 1629 | static int id(const UEdge& edge) { |
---|
| 1630 | return edge.id; |
---|
| 1631 | } |
---|
| 1632 | static UEdge uEdgeFromId(int id) { |
---|
| 1633 | return UEdge(id); |
---|
| 1634 | } |
---|
| 1635 | int maxUEdgeId() const { |
---|
| 1636 | return edges.size(); |
---|
| 1637 | } |
---|
| 1638 | |
---|
| 1639 | static int aNodeId(const Node& node) { |
---|
| 1640 | return node.id >> 1; |
---|
| 1641 | } |
---|
[2231] | 1642 | static Node nodeFromANodeId(int id) { |
---|
[2116] | 1643 | return Node(id << 1); |
---|
| 1644 | } |
---|
| 1645 | int maxANodeId() const { |
---|
| 1646 | return aNodes.size(); |
---|
| 1647 | } |
---|
| 1648 | |
---|
| 1649 | static int bNodeId(const Node& node) { |
---|
| 1650 | return node.id >> 1; |
---|
| 1651 | } |
---|
[2231] | 1652 | static Node nodeFromBNodeId(int id) { |
---|
[2116] | 1653 | return Node((id << 1) + 1); |
---|
| 1654 | } |
---|
| 1655 | int maxBNodeId() const { |
---|
| 1656 | return bNodes.size(); |
---|
| 1657 | } |
---|
| 1658 | |
---|
| 1659 | Node aNode(const UEdge& edge) const { |
---|
| 1660 | return Node(edges[edge.id].aNode); |
---|
| 1661 | } |
---|
| 1662 | Node bNode(const UEdge& edge) const { |
---|
| 1663 | return Node(edges[edge.id].bNode); |
---|
| 1664 | } |
---|
| 1665 | |
---|
| 1666 | static bool aNode(const Node& node) { |
---|
| 1667 | return (node.id & 1) == 0; |
---|
| 1668 | } |
---|
| 1669 | |
---|
| 1670 | static bool bNode(const Node& node) { |
---|
| 1671 | return (node.id & 1) == 1; |
---|
| 1672 | } |
---|
| 1673 | |
---|
| 1674 | Node addANode() { |
---|
[2386] | 1675 | int aid; |
---|
[2116] | 1676 | if (first_free_anode == -1) { |
---|
[2386] | 1677 | aid = aNodes.size(); |
---|
[2116] | 1678 | aNodes.push_back(NodeT()); |
---|
| 1679 | } else { |
---|
[2386] | 1680 | aid = first_free_anode; |
---|
[2116] | 1681 | first_free_anode = aNodes[first_free_anode].next; |
---|
| 1682 | } |
---|
| 1683 | if (first_anode != -1) { |
---|
[2386] | 1684 | aNodes[aid].next = first_anode << 1; |
---|
| 1685 | aNodes[first_anode].prev = aid << 1; |
---|
[2116] | 1686 | } else { |
---|
[2386] | 1687 | aNodes[aid].next = -1; |
---|
[2116] | 1688 | } |
---|
[2386] | 1689 | aNodes[aid].prev = -1; |
---|
| 1690 | first_anode = aid; |
---|
| 1691 | aNodes[aid].first_edge = -1; |
---|
| 1692 | return Node(aid << 1); |
---|
[2116] | 1693 | } |
---|
| 1694 | |
---|
| 1695 | Node addBNode() { |
---|
[2386] | 1696 | int bid; |
---|
[2116] | 1697 | if (first_free_bnode == -1) { |
---|
[2386] | 1698 | bid = bNodes.size(); |
---|
[2116] | 1699 | bNodes.push_back(NodeT()); |
---|
| 1700 | } else { |
---|
[2386] | 1701 | bid = first_free_bnode; |
---|
[2116] | 1702 | first_free_bnode = bNodes[first_free_bnode].next; |
---|
| 1703 | } |
---|
| 1704 | if (first_bnode != -1) { |
---|
[2386] | 1705 | bNodes[bid].next = (first_bnode << 1) + 1; |
---|
| 1706 | bNodes[first_bnode].prev = (bid << 1) + 1; |
---|
[2116] | 1707 | } else { |
---|
[2386] | 1708 | bNodes[bid].next = -1; |
---|
[2116] | 1709 | } |
---|
[2386] | 1710 | bNodes[bid].prev = -1; |
---|
| 1711 | first_bnode = bid; |
---|
| 1712 | bNodes[bid].first_edge = -1; |
---|
| 1713 | return Node((bid << 1) + 1); |
---|
[2116] | 1714 | } |
---|
| 1715 | |
---|
| 1716 | UEdge addEdge(const Node& source, const Node& target) { |
---|
| 1717 | LEMON_ASSERT(((source.id ^ target.id) & 1) == 1, NodeSetError()); |
---|
| 1718 | int edgeId; |
---|
| 1719 | if (first_free_edge != -1) { |
---|
| 1720 | edgeId = first_free_edge; |
---|
| 1721 | first_free_edge = edges[edgeId].next_out; |
---|
| 1722 | } else { |
---|
| 1723 | edgeId = edges.size(); |
---|
| 1724 | edges.push_back(UEdgeT()); |
---|
| 1725 | } |
---|
| 1726 | if ((source.id & 1) == 0) { |
---|
| 1727 | edges[edgeId].aNode = source.id; |
---|
| 1728 | edges[edgeId].bNode = target.id; |
---|
| 1729 | } else { |
---|
| 1730 | edges[edgeId].aNode = target.id; |
---|
| 1731 | edges[edgeId].bNode = source.id; |
---|
| 1732 | } |
---|
| 1733 | edges[edgeId].next_out = aNodes[edges[edgeId].aNode >> 1].first_edge; |
---|
| 1734 | edges[edgeId].prev_out = -1; |
---|
| 1735 | if (aNodes[edges[edgeId].aNode >> 1].first_edge != -1) { |
---|
| 1736 | edges[aNodes[edges[edgeId].aNode >> 1].first_edge].prev_out = edgeId; |
---|
| 1737 | } |
---|
| 1738 | aNodes[edges[edgeId].aNode >> 1].first_edge = edgeId; |
---|
| 1739 | edges[edgeId].next_in = bNodes[edges[edgeId].bNode >> 1].first_edge; |
---|
| 1740 | edges[edgeId].prev_in = -1; |
---|
| 1741 | if (bNodes[edges[edgeId].bNode >> 1].first_edge != -1) { |
---|
| 1742 | edges[bNodes[edges[edgeId].bNode >> 1].first_edge].prev_in = edgeId; |
---|
| 1743 | } |
---|
| 1744 | bNodes[edges[edgeId].bNode >> 1].first_edge = edgeId; |
---|
| 1745 | return UEdge(edgeId); |
---|
| 1746 | } |
---|
| 1747 | |
---|
| 1748 | void erase(const Node& node) { |
---|
| 1749 | if (aNode(node)) { |
---|
[2386] | 1750 | int aid = node.id >> 1; |
---|
| 1751 | if (aNodes[aid].prev != -1) { |
---|
| 1752 | aNodes[aNodes[aid].prev >> 1].next = aNodes[aid].next; |
---|
[2116] | 1753 | } else { |
---|
[2189] | 1754 | first_anode = |
---|
[2386] | 1755 | aNodes[aid].next != -1 ? aNodes[aid].next >> 1 : -1; |
---|
[2116] | 1756 | } |
---|
[2386] | 1757 | if (aNodes[aid].next != -1) { |
---|
| 1758 | aNodes[aNodes[aid].next >> 1].prev = aNodes[aid].prev; |
---|
[2116] | 1759 | } |
---|
[2386] | 1760 | aNodes[aid].next = first_free_anode; |
---|
| 1761 | first_free_anode = aid; |
---|
[2116] | 1762 | } else { |
---|
[2386] | 1763 | int bid = node.id >> 1; |
---|
| 1764 | if (bNodes[bid].prev != -1) { |
---|
| 1765 | bNodes[bNodes[bid].prev >> 1].next = bNodes[bid].next; |
---|
[2116] | 1766 | } else { |
---|
[2189] | 1767 | first_bnode = |
---|
[2386] | 1768 | bNodes[bid].next != -1 ? bNodes[bid].next >> 1 : -1; |
---|
[2116] | 1769 | } |
---|
[2386] | 1770 | if (bNodes[bid].next != -1) { |
---|
| 1771 | bNodes[bNodes[bid].next >> 1].prev = bNodes[bid].prev; |
---|
[2116] | 1772 | } |
---|
[2386] | 1773 | bNodes[bid].next = first_free_bnode; |
---|
| 1774 | first_free_bnode = bid; |
---|
[2116] | 1775 | } |
---|
| 1776 | } |
---|
| 1777 | |
---|
| 1778 | void erase(const UEdge& edge) { |
---|
| 1779 | |
---|
| 1780 | if (edges[edge.id].prev_out != -1) { |
---|
| 1781 | edges[edges[edge.id].prev_out].next_out = edges[edge.id].next_out; |
---|
| 1782 | } else { |
---|
| 1783 | aNodes[edges[edge.id].aNode >> 1].first_edge = edges[edge.id].next_out; |
---|
| 1784 | } |
---|
| 1785 | if (edges[edge.id].next_out != -1) { |
---|
| 1786 | edges[edges[edge.id].next_out].prev_out = edges[edge.id].prev_out; |
---|
| 1787 | } |
---|
| 1788 | |
---|
| 1789 | if (edges[edge.id].prev_in != -1) { |
---|
| 1790 | edges[edges[edge.id].prev_in].next_in = edges[edge.id].next_in; |
---|
| 1791 | } else { |
---|
| 1792 | bNodes[edges[edge.id].bNode >> 1].first_edge = edges[edge.id].next_in; |
---|
| 1793 | } |
---|
| 1794 | if (edges[edge.id].next_in != -1) { |
---|
| 1795 | edges[edges[edge.id].next_in].prev_in = edges[edge.id].prev_in; |
---|
| 1796 | } |
---|
| 1797 | |
---|
| 1798 | edges[edge.id].next_out = first_free_edge; |
---|
| 1799 | first_free_edge = edge.id; |
---|
| 1800 | } |
---|
[2128] | 1801 | |
---|
[2116] | 1802 | void clear() { |
---|
| 1803 | aNodes.clear(); |
---|
| 1804 | bNodes.clear(); |
---|
| 1805 | edges.clear(); |
---|
| 1806 | first_anode = -1; |
---|
| 1807 | first_free_anode = -1; |
---|
| 1808 | first_bnode = -1; |
---|
| 1809 | first_free_bnode = -1; |
---|
| 1810 | first_free_edge = -1; |
---|
| 1811 | } |
---|
| 1812 | |
---|
[2160] | 1813 | void changeANode(const UEdge& edge, const Node& node) { |
---|
| 1814 | LEMON_ASSERT((node.id & 1) == 0, NodeSetError()); |
---|
| 1815 | if (edges[edge.id].prev_out != -1) { |
---|
| 1816 | edges[edges[edge.id].prev_out].next_out = edges[edge.id].next_out; |
---|
| 1817 | } else { |
---|
| 1818 | aNodes[edges[edge.id].aNode >> 1].first_edge = edges[edge.id].next_out; |
---|
| 1819 | } |
---|
| 1820 | if (edges[edge.id].next_out != -1) { |
---|
| 1821 | edges[edges[edge.id].next_out].prev_out = edges[edge.id].prev_out; |
---|
| 1822 | } |
---|
| 1823 | if (aNodes[node.id >> 1].first_edge != -1) { |
---|
| 1824 | edges[aNodes[node.id >> 1].first_edge].prev_out = edge.id; |
---|
| 1825 | } |
---|
| 1826 | edges[edge.id].prev_out = -1; |
---|
| 1827 | edges[edge.id].next_out = aNodes[node.id >> 1].first_edge; |
---|
| 1828 | aNodes[node.id >> 1].first_edge = edge.id; |
---|
| 1829 | edges[edge.id].aNode = node.id; |
---|
| 1830 | } |
---|
| 1831 | |
---|
| 1832 | void changeBNode(const UEdge& edge, const Node& node) { |
---|
| 1833 | LEMON_ASSERT((node.id & 1) == 1, NodeSetError()); |
---|
| 1834 | if (edges[edge.id].prev_in != -1) { |
---|
| 1835 | edges[edges[edge.id].prev_in].next_in = edges[edge.id].next_in; |
---|
| 1836 | } else { |
---|
| 1837 | bNodes[edges[edge.id].bNode >> 1].first_edge = edges[edge.id].next_in; |
---|
| 1838 | } |
---|
| 1839 | if (edges[edge.id].next_in != -1) { |
---|
| 1840 | edges[edges[edge.id].next_in].prev_in = edges[edge.id].prev_in; |
---|
| 1841 | } |
---|
| 1842 | if (bNodes[node.id >> 1].first_edge != -1) { |
---|
| 1843 | edges[bNodes[node.id >> 1].first_edge].prev_in = edge.id; |
---|
| 1844 | } |
---|
| 1845 | edges[edge.id].prev_in = -1; |
---|
| 1846 | edges[edge.id].next_in = bNodes[node.id >> 1].first_edge; |
---|
| 1847 | bNodes[node.id >> 1].first_edge = edge.id; |
---|
| 1848 | edges[edge.id].bNode = node.id; |
---|
| 1849 | } |
---|
| 1850 | |
---|
[2116] | 1851 | }; |
---|
| 1852 | |
---|
| 1853 | |
---|
[2231] | 1854 | typedef BpUGraphExtender<BidirBpUGraphExtender<ListBpUGraphBase> > |
---|
| 1855 | ExtendedListBpUGraphBase; |
---|
[2116] | 1856 | |
---|
| 1857 | /// \ingroup graphs |
---|
| 1858 | /// |
---|
| 1859 | /// \brief A smart bipartite undirected graph class. |
---|
| 1860 | /// |
---|
| 1861 | /// This is a bipartite undirected graph implementation. |
---|
[2260] | 1862 | /// It is conforms to the \ref concepts::BpUGraph "BpUGraph concept". |
---|
[2256] | 1863 | /// |
---|
| 1864 | ///An important extra feature of this graph implementation is that |
---|
[2260] | 1865 | ///its maps are real \ref concepts::ReferenceMap "reference map"s. |
---|
[2256] | 1866 | /// |
---|
[2260] | 1867 | /// \sa concepts::BpUGraph. |
---|
[2116] | 1868 | /// |
---|
[2160] | 1869 | class ListBpUGraph : public ExtendedListBpUGraphBase { |
---|
| 1870 | /// \brief ListBpUGraph is \e not copy constructible. |
---|
| 1871 | /// |
---|
| 1872 | ///ListBpUGraph is \e not copy constructible. |
---|
| 1873 | ListBpUGraph(const ListBpUGraph &) :ExtendedListBpUGraphBase() {}; |
---|
| 1874 | /// \brief Assignment of ListBpUGraph to another one is \e not |
---|
| 1875 | /// allowed. |
---|
| 1876 | /// |
---|
| 1877 | /// Assignment of ListBpUGraph to another one is \e not allowed. |
---|
| 1878 | void operator=(const ListBpUGraph &) {} |
---|
| 1879 | public: |
---|
| 1880 | /// \brief Constructor |
---|
| 1881 | /// |
---|
| 1882 | /// Constructor. |
---|
| 1883 | /// |
---|
| 1884 | ListBpUGraph() {} |
---|
| 1885 | |
---|
| 1886 | typedef ExtendedListBpUGraphBase Parent; |
---|
| 1887 | /// \brief Add a new ANode to the graph. |
---|
| 1888 | /// |
---|
| 1889 | /// \return the new node. |
---|
| 1890 | /// |
---|
| 1891 | Node addANode() { return Parent::addANode(); } |
---|
| 1892 | |
---|
| 1893 | /// \brief Add a new BNode to the graph. |
---|
| 1894 | /// |
---|
| 1895 | /// \return the new node. |
---|
| 1896 | /// |
---|
| 1897 | Node addBNode() { return Parent::addBNode(); } |
---|
| 1898 | |
---|
| 1899 | /// \brief Add a new edge to the graph. |
---|
| 1900 | /// |
---|
| 1901 | /// Add a new edge to the graph with an ANode and a BNode. |
---|
| 1902 | /// \return the new undirected edge. |
---|
| 1903 | UEdge addEdge(const Node& s, const Node& t) { |
---|
| 1904 | return Parent::addEdge(s, t); |
---|
| 1905 | } |
---|
| 1906 | |
---|
| 1907 | /// \brief Changes the ANode of \c e to \c n |
---|
| 1908 | /// |
---|
| 1909 | /// Changes the ANode of \c e to \c n |
---|
| 1910 | /// |
---|
| 1911 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s referencing |
---|
| 1912 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
---|
| 1913 | ///invalidated. |
---|
| 1914 | void changeANode(UEdge e, Node n) { |
---|
| 1915 | Parent::changeANode(e,n); |
---|
| 1916 | } |
---|
| 1917 | |
---|
| 1918 | /// \brief Changes the BNode of \c e to \c n |
---|
| 1919 | /// |
---|
| 1920 | /// Changes the BNode of \c e to \c n |
---|
| 1921 | /// |
---|
| 1922 | /// \note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1923 | /// referencing the changed edge remain |
---|
| 1924 | /// valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1925 | void changeBNode(UEdge e, Node n) { |
---|
| 1926 | Parent::changeBNode(e,n); |
---|
| 1927 | } |
---|
| 1928 | |
---|
| 1929 | /// \brief Changes the source(ANode) of \c e to \c n |
---|
| 1930 | /// |
---|
| 1931 | /// Changes the source(ANode) of \c e to \c n |
---|
| 1932 | /// |
---|
| 1933 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s referencing |
---|
| 1934 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
---|
| 1935 | ///invalidated. |
---|
| 1936 | void changeSource(UEdge e, Node n) { |
---|
| 1937 | Parent::changeANode(e,n); |
---|
| 1938 | } |
---|
| 1939 | |
---|
| 1940 | /// \brief Changes the target(BNode) of \c e to \c n |
---|
| 1941 | /// |
---|
| 1942 | /// Changes the target(BNode) of \c e to \c n |
---|
| 1943 | /// |
---|
| 1944 | /// \note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1945 | /// referencing the changed edge remain |
---|
| 1946 | /// valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1947 | void changeTarget(UEdge e, Node n) { |
---|
| 1948 | Parent::changeBNode(e,n); |
---|
| 1949 | } |
---|
| 1950 | |
---|
| 1951 | /// \brief Changes the source of \c e to \c n |
---|
| 1952 | /// |
---|
| 1953 | /// Changes the source of \c e to \c n. It changes the proper |
---|
| 1954 | /// node of the represented undirected edge. |
---|
| 1955 | /// |
---|
| 1956 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
| 1957 | ///referencing the changed edge remain |
---|
| 1958 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 1959 | void changeSource(Edge e, Node n) { |
---|
| 1960 | if (Parent::direction(e)) { |
---|
| 1961 | Parent::changeANode(e,n); |
---|
| 1962 | } else { |
---|
| 1963 | Parent::changeBNode(e,n); |
---|
| 1964 | } |
---|
| 1965 | } |
---|
| 1966 | /// \brief Changes the target of \c e to \c n |
---|
| 1967 | /// |
---|
| 1968 | /// Changes the target of \c e to \c n. It changes the proper |
---|
| 1969 | /// node of the represented undirected edge. |
---|
| 1970 | /// |
---|
| 1971 | ///\note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1972 | ///referencing the changed edge remain |
---|
| 1973 | ///valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1974 | void changeTarget(Edge e, Node n) { |
---|
| 1975 | if (Parent::direction(e)) { |
---|
| 1976 | Parent::changeBNode(e,n); |
---|
| 1977 | } else { |
---|
| 1978 | Parent::changeANode(e,n); |
---|
| 1979 | } |
---|
| 1980 | } |
---|
| 1981 | /// \brief Contract two nodes. |
---|
| 1982 | /// |
---|
| 1983 | /// This function contracts two nodes. |
---|
| 1984 | /// |
---|
| 1985 | /// Node \p b will be removed but instead of deleting its |
---|
| 1986 | /// neighboring edges, they will be joined to \p a. The two nodes |
---|
| 1987 | /// should be from the same nodeset, of course. |
---|
| 1988 | /// |
---|
| 1989 | /// \note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
| 1990 | /// valid. |
---|
| 1991 | void contract(const Node& a, const Node& b) { |
---|
| 1992 | LEMON_ASSERT(Parent::aNode(a) == Parent::aNode(b), NodeSetError()); |
---|
| 1993 | if (Parent::aNode(a)) { |
---|
| 1994 | for (IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 1995 | IncEdgeIt f = e; ++f; |
---|
| 1996 | changeSource(e, a); |
---|
| 1997 | e = f; |
---|
| 1998 | } |
---|
| 1999 | } else { |
---|
| 2000 | for (IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 2001 | IncEdgeIt f = e; ++f; |
---|
| 2002 | changeTarget(e, a); |
---|
| 2003 | e = f; |
---|
| 2004 | } |
---|
| 2005 | } |
---|
| 2006 | erase(b); |
---|
| 2007 | } |
---|
| 2008 | |
---|
[2189] | 2009 | /// \brief Class to make a snapshot of the graph and restore |
---|
| 2010 | /// to it later. |
---|
| 2011 | /// |
---|
| 2012 | /// Class to make a snapshot of the graph and to restore it |
---|
| 2013 | /// later. |
---|
| 2014 | /// |
---|
| 2015 | /// The newly added nodes and undirected edges can be removed |
---|
| 2016 | /// using the restore() function. |
---|
| 2017 | /// |
---|
| 2018 | /// \warning Edge and node deletions cannot be restored. This |
---|
| 2019 | /// events invalidate the snapshot. |
---|
| 2020 | class Snapshot { |
---|
| 2021 | protected: |
---|
| 2022 | |
---|
| 2023 | typedef Parent::NodeNotifier NodeNotifier; |
---|
| 2024 | |
---|
| 2025 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
| 2026 | public: |
---|
| 2027 | |
---|
| 2028 | NodeObserverProxy(Snapshot& _snapshot) |
---|
| 2029 | : snapshot(_snapshot) {} |
---|
| 2030 | |
---|
| 2031 | using NodeNotifier::ObserverBase::attach; |
---|
| 2032 | using NodeNotifier::ObserverBase::detach; |
---|
| 2033 | using NodeNotifier::ObserverBase::attached; |
---|
| 2034 | |
---|
| 2035 | protected: |
---|
| 2036 | |
---|
| 2037 | virtual void add(const Node& node) { |
---|
| 2038 | snapshot.addNode(node); |
---|
| 2039 | } |
---|
| 2040 | virtual void add(const std::vector<Node>& nodes) { |
---|
| 2041 | for (int i = nodes.size() - 1; i >= 0; ++i) { |
---|
| 2042 | snapshot.addNode(nodes[i]); |
---|
| 2043 | } |
---|
| 2044 | } |
---|
| 2045 | virtual void erase(const Node& node) { |
---|
| 2046 | snapshot.eraseNode(node); |
---|
| 2047 | } |
---|
| 2048 | virtual void erase(const std::vector<Node>& nodes) { |
---|
[2386] | 2049 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
[2189] | 2050 | snapshot.eraseNode(nodes[i]); |
---|
| 2051 | } |
---|
| 2052 | } |
---|
| 2053 | virtual void build() { |
---|
| 2054 | Node node; |
---|
| 2055 | std::vector<Node> nodes; |
---|
[2386] | 2056 | for (notifier()->first(node); node != INVALID; |
---|
| 2057 | notifier()->next(node)) { |
---|
[2189] | 2058 | nodes.push_back(node); |
---|
| 2059 | } |
---|
| 2060 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
| 2061 | snapshot.addNode(nodes[i]); |
---|
| 2062 | } |
---|
| 2063 | } |
---|
| 2064 | virtual void clear() { |
---|
| 2065 | Node node; |
---|
[2386] | 2066 | for (notifier()->first(node); node != INVALID; |
---|
| 2067 | notifier()->next(node)) { |
---|
[2189] | 2068 | snapshot.eraseNode(node); |
---|
| 2069 | } |
---|
| 2070 | } |
---|
| 2071 | |
---|
| 2072 | Snapshot& snapshot; |
---|
| 2073 | }; |
---|
| 2074 | |
---|
| 2075 | class UEdgeObserverProxy : public UEdgeNotifier::ObserverBase { |
---|
| 2076 | public: |
---|
| 2077 | |
---|
| 2078 | UEdgeObserverProxy(Snapshot& _snapshot) |
---|
| 2079 | : snapshot(_snapshot) {} |
---|
| 2080 | |
---|
| 2081 | using UEdgeNotifier::ObserverBase::attach; |
---|
| 2082 | using UEdgeNotifier::ObserverBase::detach; |
---|
| 2083 | using UEdgeNotifier::ObserverBase::attached; |
---|
| 2084 | |
---|
| 2085 | protected: |
---|
| 2086 | |
---|
| 2087 | virtual void add(const UEdge& edge) { |
---|
| 2088 | snapshot.addUEdge(edge); |
---|
| 2089 | } |
---|
| 2090 | virtual void add(const std::vector<UEdge>& edges) { |
---|
| 2091 | for (int i = edges.size() - 1; i >= 0; ++i) { |
---|
| 2092 | snapshot.addUEdge(edges[i]); |
---|
| 2093 | } |
---|
| 2094 | } |
---|
| 2095 | virtual void erase(const UEdge& edge) { |
---|
| 2096 | snapshot.eraseUEdge(edge); |
---|
| 2097 | } |
---|
| 2098 | virtual void erase(const std::vector<UEdge>& edges) { |
---|
[2386] | 2099 | for (int i = 0; i < int(edges.size()); ++i) { |
---|
[2189] | 2100 | snapshot.eraseUEdge(edges[i]); |
---|
| 2101 | } |
---|
| 2102 | } |
---|
| 2103 | virtual void build() { |
---|
| 2104 | UEdge edge; |
---|
| 2105 | std::vector<UEdge> edges; |
---|
[2386] | 2106 | for (notifier()->first(edge); edge != INVALID; |
---|
| 2107 | notifier()->next(edge)) { |
---|
[2189] | 2108 | edges.push_back(edge); |
---|
| 2109 | } |
---|
| 2110 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
| 2111 | snapshot.addUEdge(edges[i]); |
---|
| 2112 | } |
---|
| 2113 | } |
---|
| 2114 | virtual void clear() { |
---|
| 2115 | UEdge edge; |
---|
[2386] | 2116 | for (notifier()->first(edge); edge != INVALID; |
---|
| 2117 | notifier()->next(edge)) { |
---|
[2189] | 2118 | snapshot.eraseUEdge(edge); |
---|
| 2119 | } |
---|
| 2120 | } |
---|
| 2121 | |
---|
| 2122 | Snapshot& snapshot; |
---|
| 2123 | }; |
---|
| 2124 | |
---|
| 2125 | ListBpUGraph *graph; |
---|
| 2126 | |
---|
| 2127 | NodeObserverProxy node_observer_proxy; |
---|
| 2128 | UEdgeObserverProxy edge_observer_proxy; |
---|
| 2129 | |
---|
| 2130 | std::list<Node> added_nodes; |
---|
| 2131 | std::list<UEdge> added_edges; |
---|
| 2132 | |
---|
| 2133 | |
---|
| 2134 | void addNode(const Node& node) { |
---|
| 2135 | added_nodes.push_front(node); |
---|
| 2136 | } |
---|
| 2137 | void eraseNode(const Node& node) { |
---|
| 2138 | std::list<Node>::iterator it = |
---|
| 2139 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
| 2140 | if (it == added_nodes.end()) { |
---|
| 2141 | clear(); |
---|
| 2142 | edge_observer_proxy.detach(); |
---|
| 2143 | throw NodeNotifier::ImmediateDetach(); |
---|
| 2144 | } else { |
---|
| 2145 | added_nodes.erase(it); |
---|
| 2146 | } |
---|
| 2147 | } |
---|
| 2148 | |
---|
| 2149 | void addUEdge(const UEdge& edge) { |
---|
| 2150 | added_edges.push_front(edge); |
---|
| 2151 | } |
---|
| 2152 | void eraseUEdge(const UEdge& edge) { |
---|
| 2153 | std::list<UEdge>::iterator it = |
---|
| 2154 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
| 2155 | if (it == added_edges.end()) { |
---|
| 2156 | clear(); |
---|
| 2157 | node_observer_proxy.detach(); |
---|
| 2158 | throw UEdgeNotifier::ImmediateDetach(); |
---|
| 2159 | } else { |
---|
| 2160 | added_edges.erase(it); |
---|
| 2161 | } |
---|
| 2162 | } |
---|
| 2163 | |
---|
| 2164 | void attach(ListBpUGraph &_graph) { |
---|
| 2165 | graph = &_graph; |
---|
[2381] | 2166 | node_observer_proxy.attach(graph->notifier(Node())); |
---|
| 2167 | edge_observer_proxy.attach(graph->notifier(UEdge())); |
---|
[2189] | 2168 | } |
---|
| 2169 | |
---|
| 2170 | void detach() { |
---|
| 2171 | node_observer_proxy.detach(); |
---|
| 2172 | edge_observer_proxy.detach(); |
---|
| 2173 | } |
---|
| 2174 | |
---|
| 2175 | bool attached() const { |
---|
| 2176 | return node_observer_proxy.attached(); |
---|
| 2177 | } |
---|
| 2178 | |
---|
| 2179 | void clear() { |
---|
| 2180 | added_nodes.clear(); |
---|
| 2181 | added_edges.clear(); |
---|
| 2182 | } |
---|
| 2183 | |
---|
| 2184 | public: |
---|
| 2185 | |
---|
| 2186 | /// \brief Default constructor. |
---|
| 2187 | /// |
---|
| 2188 | /// Default constructor. |
---|
| 2189 | /// To actually make a snapshot you must call save(). |
---|
| 2190 | Snapshot() |
---|
| 2191 | : graph(0), node_observer_proxy(*this), |
---|
| 2192 | edge_observer_proxy(*this) {} |
---|
| 2193 | |
---|
| 2194 | /// \brief Constructor that immediately makes a snapshot. |
---|
| 2195 | /// |
---|
| 2196 | /// This constructor immediately makes a snapshot of the graph. |
---|
| 2197 | /// \param _graph The graph we make a snapshot of. |
---|
| 2198 | Snapshot(ListBpUGraph &_graph) |
---|
| 2199 | : node_observer_proxy(*this), |
---|
| 2200 | edge_observer_proxy(*this) { |
---|
| 2201 | attach(_graph); |
---|
| 2202 | } |
---|
| 2203 | |
---|
| 2204 | /// \brief Make a snapshot. |
---|
| 2205 | /// |
---|
| 2206 | /// Make a snapshot of the graph. |
---|
| 2207 | /// |
---|
| 2208 | /// This function can be called more than once. In case of a repeated |
---|
| 2209 | /// call, the previous snapshot gets lost. |
---|
| 2210 | /// \param _graph The graph we make the snapshot of. |
---|
| 2211 | void save(ListBpUGraph &_graph) { |
---|
| 2212 | if (attached()) { |
---|
| 2213 | detach(); |
---|
| 2214 | clear(); |
---|
| 2215 | } |
---|
| 2216 | attach(_graph); |
---|
| 2217 | } |
---|
| 2218 | |
---|
| 2219 | /// \brief Undo the changes until the last snapshot. |
---|
| 2220 | // |
---|
| 2221 | /// Undo the changes until the last snapshot created by save(). |
---|
| 2222 | void restore() { |
---|
| 2223 | detach(); |
---|
| 2224 | for(std::list<UEdge>::iterator it = added_edges.begin(); |
---|
| 2225 | it != added_edges.end(); ++it) { |
---|
| 2226 | graph->erase(*it); |
---|
| 2227 | } |
---|
| 2228 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
| 2229 | it != added_nodes.end(); ++it) { |
---|
| 2230 | graph->erase(*it); |
---|
| 2231 | } |
---|
| 2232 | clear(); |
---|
| 2233 | } |
---|
| 2234 | |
---|
| 2235 | /// \brief Gives back true when the snapshot is valid. |
---|
| 2236 | /// |
---|
| 2237 | /// Gives back true when the snapshot is valid. |
---|
| 2238 | bool valid() const { |
---|
| 2239 | return attached(); |
---|
| 2240 | } |
---|
| 2241 | }; |
---|
[2160] | 2242 | }; |
---|
[2116] | 2243 | |
---|
| 2244 | |
---|
| 2245 | /// @} |
---|
[948] | 2246 | } //namespace lemon |
---|
[946] | 2247 | |
---|
[400] | 2248 | |
---|
[946] | 2249 | #endif |
---|