1 | //======================================================================= |
---|
2 | // Copyright 1997, 1998, 1999, 2000 University of Notre Dame. |
---|
3 | // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek, |
---|
4 | // |
---|
5 | // Copyright 2007 Orkney, Inc. |
---|
6 | // Author: Anton A. Patrushev |
---|
7 | // |
---|
8 | // Distributed under the Boost Software License, Version 1.0. (See |
---|
9 | // accompanying file LICENSE_1_0.txt or copy at |
---|
10 | // http://www.boost.org/LICENSE_1_0.txt) |
---|
11 | //======================================================================= |
---|
12 | #ifndef BOOST_GRAPH_SHOOTING_STAR_RELAX_HPP |
---|
13 | #define BOOST_GRAPH_SHOOTING_STAR_RELAX_HPP |
---|
14 | |
---|
15 | #include <functional> |
---|
16 | #include <boost/limits.hpp> // for numeric limits |
---|
17 | #include <boost/graph/graph_traits.hpp> |
---|
18 | #include <boost/property_map.hpp> |
---|
19 | |
---|
20 | #include <iostream> |
---|
21 | #include <fstream> |
---|
22 | #include <postgres.h> |
---|
23 | |
---|
24 | bool is_equal ( int a[], int b[], int size ) |
---|
25 | { |
---|
26 | for ( int i = 0; i < size; i++ ) |
---|
27 | { |
---|
28 | if ( a[i] != b[i] ) |
---|
29 | return false; |
---|
30 | } |
---|
31 | |
---|
32 | return true; |
---|
33 | } |
---|
34 | |
---|
35 | namespace boost { |
---|
36 | |
---|
37 | // The following version of the plus functor prevents |
---|
38 | // problems due to overflow at positive infinity. |
---|
39 | |
---|
40 | template <class T> |
---|
41 | struct closed_plus |
---|
42 | { |
---|
43 | // std::abs just isn't portable :( |
---|
44 | template <class X> |
---|
45 | inline X my_abs(const X& x) const { return x < 0 ? -x : x; } |
---|
46 | |
---|
47 | T operator()(const T& a, const T& b) const { |
---|
48 | using namespace std; |
---|
49 | T inf = (numeric_limits<T>::max)(); |
---|
50 | if (b > 0 && my_abs(inf - a) < b) |
---|
51 | return inf; |
---|
52 | return a + b; |
---|
53 | } |
---|
54 | }; |
---|
55 | |
---|
56 | template <class Edge, class Graph, class WeightMap, class EdgeMap, |
---|
57 | class PredecessorMap, class DistanceMap, class CostMap, |
---|
58 | class HistoryMap, class BinaryFunction, class BinaryPredicate> |
---|
59 | bool relax(Edge e, |
---|
60 | Edge pe, |
---|
61 | const Graph& g, const WeightMap& w, const EdgeMap& em, |
---|
62 | PredecessorMap& p, DistanceMap& d, CostMap& c, |
---|
63 | HistoryMap& his, |
---|
64 | const BinaryFunction& combine, const BinaryPredicate& compare, |
---|
65 | int e_max_id) |
---|
66 | { |
---|
67 | typedef typename graph_traits<Graph>::directed_category DirCat; |
---|
68 | bool is_undirected = is_same<DirCat, undirected_tag>::value; |
---|
69 | |
---|
70 | typedef typename graph_traits<Graph>::vertex_descriptor Vertex; |
---|
71 | |
---|
72 | Vertex u = source(e, g), v = target(e, g), pu = source(pe, g); |
---|
73 | |
---|
74 | typedef typename property_traits<DistanceMap>::value_type D; |
---|
75 | typedef typename property_traits<WeightMap>::value_type W; |
---|
76 | |
---|
77 | typedef typename property_traits<EdgeMap>::value_type E; |
---|
78 | |
---|
79 | D d_e = get(d, e); |
---|
80 | D d_pe = get(d, pe); |
---|
81 | |
---|
82 | W w_e = get(w, e); |
---|
83 | |
---|
84 | //myfile<<"w(e) = "<<w_e<<"\n"<<std::flush; |
---|
85 | |
---|
86 | //myfile<<"cost("<<g[e].id<<") = "<<get(c, e)<<"\n"<<std::flush; |
---|
87 | |
---|
88 | //myfile<<"d("<<g[e].id<<") = "<<get(d, e)<<"\n"<<std::flush; |
---|
89 | |
---|
90 | //myfile<<g[u].id<<" - "<<g[v].id<<" : d_e="<<d_e<<"\n"<<std::flush; |
---|
91 | |
---|
92 | |
---|
93 | //edge where we came from |
---|
94 | bool edge_exists; |
---|
95 | //Edge pe; |
---|
96 | |
---|
97 | //pe = get(p, g[e].id); |
---|
98 | |
---|
99 | W w_pe_e; |
---|
100 | |
---|
101 | //E w_pe = get(em, pe); |
---|
102 | E w_pe = get(em, e); |
---|
103 | |
---|
104 | bool contains = false; |
---|
105 | |
---|
106 | |
---|
107 | //myfile<<"w(pe, e) = "<<w_pe_e<<"\n"<<std::flush; |
---|
108 | |
---|
109 | //myfile<<"id = "<<g[e].id<<", size = "<<w_pe[g[e].id].second.size()<<"\n"<<std::flush; |
---|
110 | |
---|
111 | Edge ce = pe; |
---|
112 | int e_id; |
---|
113 | |
---|
114 | std::vector<Edge> edge_h; |
---|
115 | typedef typename std::vector<Edge>::iterator It; |
---|
116 | |
---|
117 | //for(int i=w_pe[g[e].id].second.size()-1; i>=0; --i) |
---|
118 | |
---|
119 | if(w_pe[g[e].id].second.size() < 1 || w_pe[g[e].id].second.back() > 0) |
---|
120 | for(int i=0; i<w_pe[g[e].id].second.size(); ++i) |
---|
121 | { |
---|
122 | e_id = g[ce].id; |
---|
123 | //myfile<<"e_id="<<e_id<<", second["<<g[e].id<<"]="<<w_pe[g[e].id].second.at(i)<<"\n"<<std::flush; |
---|
124 | |
---|
125 | if(w_pe[g[e].id].second.at(i) == -1) |
---|
126 | continue; |
---|
127 | |
---|
128 | if(w_pe[g[e].id].second.at(i) == e_id || w_pe[g[e].id].second.at(i)+e_max_id == e_id) |
---|
129 | { |
---|
130 | contains = true; |
---|
131 | edge_h.push_back(ce); |
---|
132 | } |
---|
133 | else |
---|
134 | { |
---|
135 | contains = false; |
---|
136 | } |
---|
137 | |
---|
138 | ce = p[g[ce].id]; |
---|
139 | } |
---|
140 | |
---|
141 | //calculate w_pe_e |
---|
142 | if(contains) |
---|
143 | { |
---|
144 | |
---|
145 | w_pe_e = w_pe[g[e].id].first; |
---|
146 | |
---|
147 | |
---|
148 | } |
---|
149 | else |
---|
150 | { |
---|
151 | w_pe_e = 0; |
---|
152 | } |
---|
153 | |
---|
154 | //Ugly combination with w_e_pe. |
---|
155 | |
---|
156 | if ( compare(combine(combine(d_pe, get(w, pe)), w_pe_e), d_e)) |
---|
157 | { |
---|
158 | put(d, e, combine(combine(d_pe, get(w, pe)), w_pe_e)); |
---|
159 | p[g[e].id] = pe; |
---|
160 | |
---|
161 | return true; |
---|
162 | } |
---|
163 | else |
---|
164 | { |
---|
165 | return false; |
---|
166 | } |
---|
167 | } |
---|
168 | |
---|
169 | template <class Graph, class WeightMap, class EdgeMap, |
---|
170 | class PredecessorMap, class DistanceMap> |
---|
171 | bool relax(typename graph_traits<Graph>::edge_descriptor e, |
---|
172 | const Graph& g, WeightMap w, EdgeMap em, PredecessorMap p, DistanceMap d) |
---|
173 | { |
---|
174 | typedef typename property_traits<DistanceMap>::value_type D; |
---|
175 | typedef closed_plus<D> Combine; |
---|
176 | typedef std::less<D> Compare; |
---|
177 | return relax(e, g, w, em, p, d, Combine(), Compare()); |
---|
178 | } |
---|
179 | |
---|
180 | } // namespace boost |
---|
181 | |
---|
182 | #endif |
---|