1 | /* -*- C++ -*- |
---|
2 | * src/lemon/graph_utils.h - Part of LEMON, a generic C++ optimization library |
---|
3 | * |
---|
4 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
5 | * (Egervary Combinatorial Optimization Research Group, EGRES). |
---|
6 | * |
---|
7 | * Permission to use, modify and distribute this software is granted |
---|
8 | * provided that this copyright notice appears in all copies. For |
---|
9 | * precise terms see the accompanying LICENSE file. |
---|
10 | * |
---|
11 | * This software is provided "AS IS" with no warranty of any kind, |
---|
12 | * express or implied, and with no claim as to its suitability for any |
---|
13 | * purpose. |
---|
14 | * |
---|
15 | */ |
---|
16 | |
---|
17 | #ifndef LEMON_GRAPH_UTILS_H |
---|
18 | #define LEMON_GRAPH_UTILS_H |
---|
19 | |
---|
20 | #include <iterator> |
---|
21 | |
---|
22 | #include <lemon/invalid.h> |
---|
23 | |
---|
24 | ///\ingroup gutils |
---|
25 | ///\file |
---|
26 | ///\brief Graph utilities. |
---|
27 | /// |
---|
28 | |
---|
29 | |
---|
30 | namespace lemon { |
---|
31 | |
---|
32 | /// \addtogroup gutils |
---|
33 | /// @{ |
---|
34 | |
---|
35 | // counters in the graph |
---|
36 | /// \brief Function to count the items in the graph. |
---|
37 | /// |
---|
38 | /// This function counts the items in the graph. |
---|
39 | /// The complexity of the function is O(n) because |
---|
40 | /// it iterates on all of the items. |
---|
41 | |
---|
42 | template <typename Graph, typename ItemIt> |
---|
43 | inline int countItems(const Graph& _g) { |
---|
44 | int num = 0; |
---|
45 | for (ItemIt it(_g); it != INVALID; ++it) { |
---|
46 | ++num; |
---|
47 | } |
---|
48 | return num; |
---|
49 | } |
---|
50 | |
---|
51 | /// \brief Function to count the nodes in the graph. |
---|
52 | /// |
---|
53 | /// This function counts the nodes in the graph. |
---|
54 | /// The complexity of the function is O(n) but for some |
---|
55 | /// graph structure it is specialized to O(1). |
---|
56 | |
---|
57 | template <typename Graph> |
---|
58 | inline int countNodes(const Graph& _g) { |
---|
59 | return countItems<Graph, typename Graph::NodeIt>(_g); |
---|
60 | } |
---|
61 | |
---|
62 | /// \brief Function to count the edges in the graph. |
---|
63 | /// |
---|
64 | /// This function counts the edges in the graph. |
---|
65 | /// The complexity of the function is O(e) but for some |
---|
66 | /// graph structure it is specialized to O(1). |
---|
67 | template <typename Graph> |
---|
68 | inline int countEdges(const Graph& _g) { |
---|
69 | return countItems<Graph, typename Graph::EdgeIt>(_g); |
---|
70 | } |
---|
71 | |
---|
72 | /// \brief Function to count the symmetric edges in the graph. |
---|
73 | /// |
---|
74 | /// This function counts the symmetric edges in the graph. |
---|
75 | /// The complexity of the function is O(e) but for some |
---|
76 | /// graph structure it is specialized to O(1). |
---|
77 | template <typename Graph> |
---|
78 | inline int countSymEdges(const Graph& _g) { |
---|
79 | return countItems<Graph, typename Graph::SymEdgeIt>(_g); |
---|
80 | } |
---|
81 | |
---|
82 | template <typename Graph, typename DegIt> |
---|
83 | inline int countNodeDegree(const Graph& _g, const typename Graph::Node& _n) { |
---|
84 | int num = 0; |
---|
85 | for (DegIt it(_g, _n); it != INVALID; ++it) { |
---|
86 | ++num; |
---|
87 | } |
---|
88 | return num; |
---|
89 | } |
---|
90 | |
---|
91 | template <typename Graph> |
---|
92 | inline int countOutEdges(const Graph& _g, const typename Graph::Node& _n) { |
---|
93 | return countNodeDegree<Graph, typename Graph::OutEdgeIt>(_g, _n); |
---|
94 | } |
---|
95 | |
---|
96 | template <typename Graph> |
---|
97 | inline int countInEdges(const Graph& _g, const typename Graph::Node& _n) { |
---|
98 | return countNodeDegree<Graph, typename Graph::InEdgeIt>(_g, _n); |
---|
99 | } |
---|
100 | |
---|
101 | // graph copy |
---|
102 | |
---|
103 | template < |
---|
104 | typename DestinationGraph, |
---|
105 | typename SourceGraph, |
---|
106 | typename NodeBijection> |
---|
107 | void copyNodes(DestinationGraph& _d, const SourceGraph& _s, |
---|
108 | NodeBijection& _nb) { |
---|
109 | for (typename SourceGraph::NodeIt it(_s); it != INVALID; ++it) { |
---|
110 | _nb[it] = _d.addNode(); |
---|
111 | } |
---|
112 | } |
---|
113 | |
---|
114 | template < |
---|
115 | typename DestinationGraph, |
---|
116 | typename SourceGraph, |
---|
117 | typename NodeBijection, |
---|
118 | typename EdgeBijection> |
---|
119 | void copyEdges(DestinationGraph& _d, const SourceGraph& _s, |
---|
120 | const NodeBijection& _nb, EdgeBijection& _eb) { |
---|
121 | for (typename SourceGraph::EdgeIt it(_s); it != INVALID; ++it) { |
---|
122 | _eb[it] = _d.addEdge(_nb[_s.tail(it)], _nb[_s.head(it)]); |
---|
123 | } |
---|
124 | } |
---|
125 | |
---|
126 | template < |
---|
127 | typename DestinationGraph, |
---|
128 | typename SourceGraph, |
---|
129 | typename NodeBijection, |
---|
130 | typename EdgeBijection> |
---|
131 | void copyGraph(DestinationGraph& _d, const SourceGraph& _s, |
---|
132 | NodeBijection& _nb, EdgeBijection& _eb) { |
---|
133 | nodeCopy(_d, _s, _nb); |
---|
134 | edgeCopy(_d, _s, _nb, _eb); |
---|
135 | } |
---|
136 | |
---|
137 | template < |
---|
138 | typename _DestinationGraph, |
---|
139 | typename _SourceGraph, |
---|
140 | typename _NodeBijection |
---|
141 | =typename _SourceGraph::template NodeMap<typename _DestinationGraph::Node>, |
---|
142 | typename _EdgeBijection |
---|
143 | =typename _SourceGraph::template EdgeMap<typename _DestinationGraph::Edge> |
---|
144 | > |
---|
145 | class GraphCopy { |
---|
146 | public: |
---|
147 | |
---|
148 | typedef _DestinationGraph DestinationGraph; |
---|
149 | typedef _SourceGraph SourceGraph; |
---|
150 | |
---|
151 | typedef _NodeBijection NodeBijection; |
---|
152 | typedef _EdgeBijection EdgeBijection; |
---|
153 | |
---|
154 | protected: |
---|
155 | |
---|
156 | NodeBijection node_bijection; |
---|
157 | EdgeBijection edge_bijection; |
---|
158 | |
---|
159 | public: |
---|
160 | |
---|
161 | GraphCopy(DestinationGraph& _d, const SourceGraph& _s) { |
---|
162 | copyGraph(_d, _s, node_bijection, edge_bijection); |
---|
163 | } |
---|
164 | |
---|
165 | const NodeBijection& getNodeBijection() const { |
---|
166 | return node_bijection; |
---|
167 | } |
---|
168 | |
---|
169 | const EdgeBijection& getEdgeBijection() const { |
---|
170 | return edge_bijection; |
---|
171 | } |
---|
172 | |
---|
173 | }; |
---|
174 | |
---|
175 | /// @} |
---|
176 | |
---|
177 | } //END OF NAMESPACE LEMON |
---|
178 | |
---|
179 | #endif |
---|