1.1 --- a/src/lemon/undir_graph_extender.h Tue Apr 05 09:49:01 2005 +0000
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,278 +0,0 @@
1.4 -/* -*- C++ -*-
1.5 - *
1.6 - * src/lemon/undir_graph_extender.h - Part of LEMON, a generic C++
1.7 - * optimization library
1.8 - *
1.9 - * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi
1.10 - * Kutatocsoport (Egervary Combinatorial Optimization Research Group,
1.11 - * EGRES).
1.12 - *
1.13 - * Permission to use, modify and distribute this software is granted
1.14 - * provided that this copyright notice appears in all copies. For
1.15 - * precise terms see the accompanying LICENSE file.
1.16 - *
1.17 - * This software is provided "AS IS" with no warranty of any kind,
1.18 - * express or implied, and with no claim as to its suitability for any
1.19 - * purpose.
1.20 - *
1.21 - */
1.22 -
1.23 -#ifndef LEMON_UNDIR_GRAPH_EXTENDER_H
1.24 -#define LEMON_UNDIR_GRAPH_EXTENDER_H
1.25 -
1.26 -#include <lemon/invalid.h>
1.27 -
1.28 -namespace lemon {
1.29 -
1.30 - template <typename _Base>
1.31 - class UndirGraphExtender : public _Base {
1.32 - typedef _Base Parent;
1.33 - typedef UndirGraphExtender Graph;
1.34 -
1.35 - public:
1.36 -
1.37 - typedef typename Parent::Edge UndirEdge;
1.38 - typedef typename Parent::Node Node;
1.39 -
1.40 - class Edge : public UndirEdge {
1.41 - friend class UndirGraphExtender;
1.42 -
1.43 - protected:
1.44 - // FIXME: Marci use opposite logic in his graph wrappers. It would
1.45 - // be reasonable to syncronize...
1.46 - bool forward;
1.47 -
1.48 - public:
1.49 - Edge() {}
1.50 -
1.51 - /// \brief Directed edge from undirected edge and a direction.
1.52 - ///
1.53 - /// This constructor is not a part of the concept interface of
1.54 - /// undirected graph, so please avoid using it if possible!
1.55 - Edge(const UndirEdge &ue, bool _forward) :
1.56 - UndirEdge(ue), forward(_forward) {}
1.57 -
1.58 - /// \brief Directed edge from undirected edge and a source node.
1.59 - ///
1.60 - /// Constructs a directed edge from undirected edge and a source node.
1.61 - ///
1.62 - /// \note You have to specify the graph for this constructor.
1.63 - Edge(const Graph &g, const UndirEdge &ue, const Node &n) :
1.64 - UndirEdge(ue) { forward = (g.source(ue) == n); }
1.65 -
1.66 - /// Invalid edge constructor
1.67 - Edge(Invalid i) : UndirEdge(i), forward(true) {}
1.68 -
1.69 - bool operator==(const Edge &that) const {
1.70 - return forward==that.forward && UndirEdge(*this)==UndirEdge(that);
1.71 - }
1.72 - bool operator!=(const Edge &that) const {
1.73 - return forward!=that.forward || UndirEdge(*this)!=UndirEdge(that);
1.74 - }
1.75 - bool operator<(const Edge &that) const {
1.76 - return forward<that.forward ||
1.77 - (!(that.forward<forward) && UndirEdge(*this)<UndirEdge(that));
1.78 - }
1.79 - };
1.80 -
1.81 -
1.82 - /// \brief Edge of opposite direction.
1.83 - ///
1.84 - /// Returns the Edge of opposite direction.
1.85 - Edge opposite(const Edge &e) const {
1.86 - return Edge(e,!e.forward);
1.87 - }
1.88 -
1.89 - protected:
1.90 -
1.91 - template <typename E>
1.92 - Node _dirSource(const E &e) const {
1.93 - return e.forward ? Parent::source(e) : Parent::target(e);
1.94 - }
1.95 -
1.96 - template <typename E>
1.97 - Node _dirTarget(const E &e) const {
1.98 - return e.forward ? Parent::target(e) : Parent::source(e);
1.99 - }
1.100 -
1.101 - public:
1.102 - /// \todo Shouldn't the "source" of an undirected edge be called "aNode"
1.103 - /// or something???
1.104 - using Parent::source;
1.105 -
1.106 - /// Source of the given Edge.
1.107 - Node source(const Edge &e) const {
1.108 - return _dirSource(e);
1.109 - }
1.110 -
1.111 - /// \todo Shouldn't the "target" of an undirected edge be called "bNode"
1.112 - /// or something???
1.113 - using Parent::target;
1.114 -
1.115 - /// Target of the given Edge.
1.116 - Node target(const Edge &e) const {
1.117 - return _dirTarget(e);
1.118 - }
1.119 -
1.120 - /// Returns whether the given directed edge is same orientation as the
1.121 - /// corresponding undirected edge.
1.122 - ///
1.123 - /// \todo reference to the corresponding point of the undirected graph
1.124 - /// concept. "What does the direction of an undirected edge mean?"
1.125 - bool forward(const Edge &e) const { return e.forward; }
1.126 -
1.127 - Node oppositeNode(const Node &n, const UndirEdge &e) const {
1.128 - if( n == Parent::source(e))
1.129 - return Parent::target(e);
1.130 - else if( n == Parent::target(e))
1.131 - return Parent::source(e);
1.132 - else
1.133 - return INVALID;
1.134 - }
1.135 -
1.136 - /// Directed edge from an undirected edge and a source node.
1.137 - ///
1.138 - /// Returns a (directed) Edge corresponding to the specified UndirEdge
1.139 - /// and source Node.
1.140 - ///
1.141 - ///\todo Do we need this?
1.142 - ///
1.143 - ///\todo Better name...
1.144 - Edge edgeWithSource(const UndirEdge &ue, const Node &s) const {
1.145 - return Edge(*this, ue, s);
1.146 - }
1.147 -
1.148 - using Parent::first;
1.149 - void first(Edge &e) const {
1.150 - Parent::first(e);
1.151 - e.forward=true;
1.152 - }
1.153 -
1.154 - using Parent::next;
1.155 - void next(Edge &e) const {
1.156 - if( e.forward ) {
1.157 - e.forward = false;
1.158 - }
1.159 - else {
1.160 - Parent::next(e);
1.161 - e.forward = true;
1.162 - }
1.163 - }
1.164 -
1.165 -
1.166 - protected:
1.167 -
1.168 - template <typename E>
1.169 - void _dirFirstOut(E &e, const Node &n) const {
1.170 - Parent::firstIn(e,n);
1.171 - if( UndirEdge(e) != INVALID ) {
1.172 - e.forward = false;
1.173 - }
1.174 - else {
1.175 - Parent::firstOut(e,n);
1.176 - e.forward = true;
1.177 - }
1.178 - }
1.179 - template <typename E>
1.180 - void _dirFirstIn(E &e, const Node &n) const {
1.181 - Parent::firstOut(e,n);
1.182 - if( UndirEdge(e) != INVALID ) {
1.183 - e.forward = false;
1.184 - }
1.185 - else {
1.186 - Parent::firstIn(e,n);
1.187 - e.forward = true;
1.188 - }
1.189 - }
1.190 -
1.191 - template <typename E>
1.192 - void _dirNextOut(E &e) const {
1.193 - if( ! e.forward ) {
1.194 - Node n = Parent::target(e);
1.195 - Parent::nextIn(e);
1.196 - if( UndirEdge(e) == INVALID ) {
1.197 - Parent::firstOut(e, n);
1.198 - e.forward = true;
1.199 - }
1.200 - }
1.201 - else {
1.202 - Parent::nextOut(e);
1.203 - }
1.204 - }
1.205 - template <typename E>
1.206 - void _dirNextIn(E &e) const {
1.207 - if( ! e.forward ) {
1.208 - Node n = Parent::source(e);
1.209 - Parent::nextOut(e);
1.210 - if( UndirEdge(e) == INVALID ) {
1.211 - Parent::firstIn(e, n);
1.212 - e.forward = true;
1.213 - }
1.214 - }
1.215 - else {
1.216 - Parent::nextIn(e);
1.217 - }
1.218 - }
1.219 -
1.220 - public:
1.221 -
1.222 - void firstOut(Edge &e, const Node &n) const {
1.223 - _dirFirstOut(e, n);
1.224 - }
1.225 - void firstIn(Edge &e, const Node &n) const {
1.226 - _dirFirstIn(e, n);
1.227 - }
1.228 -
1.229 - void nextOut(Edge &e) const {
1.230 - _dirNextOut(e);
1.231 - }
1.232 - void nextIn(Edge &e) const {
1.233 - _dirNextIn(e);
1.234 - }
1.235 -
1.236 - // Miscellaneous stuff:
1.237 -
1.238 - /// \todo these methods (id, maxEdgeId) should be moved into separate
1.239 - /// Extender
1.240 -
1.241 - // using Parent::id;
1.242 - // Using "using" is not a good idea, cause it could be that there is
1.243 - // no "id" in Parent...
1.244 -
1.245 - int id(const Node &n) const {
1.246 - return Parent::id(n);
1.247 - }
1.248 -
1.249 - int id(const UndirEdge &e) const {
1.250 - return Parent::id(e);
1.251 - }
1.252 -
1.253 - int id(const Edge &e) const {
1.254 - return 2 * Parent::id(e) + int(e.forward);
1.255 - }
1.256 -
1.257 -
1.258 - int maxId(Node) const {
1.259 - return Parent::maxId(Node());
1.260 - }
1.261 -
1.262 - int maxId(Edge) const {
1.263 - return 2 * Parent::maxId(typename Parent::Edge()) + 1;
1.264 - }
1.265 - int maxId(UndirEdge) const {
1.266 - return Parent::maxId(typename Parent::Edge());
1.267 - }
1.268 -
1.269 -
1.270 - int edgeNum() const {
1.271 - return 2 * Parent::edgeNum();
1.272 - }
1.273 - int undirEdgeNum() const {
1.274 - return Parent::edgeNum();
1.275 - }
1.276 -
1.277 - };
1.278 -
1.279 -}
1.280 -
1.281 -#endif // LEMON_UNDIR_GRAPH_EXTENDER_H