Blame view

3rdparty/boost_1_81_0/boost/graph/bandwidth.hpp 2.91 KB
598bfd3f   Hu Chunming   提交_GLIBCXX_USE_CX...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
  // Copyright (c) Jeremy Siek 2001, Marc Wintermantel 2002
  //
  // Distributed under the Boost Software License, Version 1.0. (See
  // accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt)
  
  #ifndef BOOST_GRAPH_BANDWIDTH_HPP
  #define BOOST_GRAPH_BANDWIDTH_HPP
  
  #include <algorithm> // for std::min and std::max
  #include <boost/config.hpp>
  #include <boost/graph/graph_traits.hpp>
  #include <boost/detail/numeric_traits.hpp>
  
  namespace boost
  {
  
  template < typename Graph, typename VertexIndexMap >
  typename graph_traits< Graph >::vertices_size_type ith_bandwidth(
      typename graph_traits< Graph >::vertex_descriptor i, const Graph& g,
      VertexIndexMap index)
  {
      BOOST_USING_STD_MAX();
      using std::abs;
      typedef
          typename graph_traits< Graph >::vertices_size_type vertices_size_type;
      vertices_size_type b = 0;
      typename graph_traits< Graph >::out_edge_iterator e, end;
      for (boost::tie(e, end) = out_edges(i, g); e != end; ++e)
      {
          int f_i = get(index, i);
          int f_j = get(index, target(*e, g));
          b = max BOOST_PREVENT_MACRO_SUBSTITUTION(
              b, vertices_size_type(abs(f_i - f_j)));
      }
      return b;
  }
  
  template < typename Graph >
  typename graph_traits< Graph >::vertices_size_type ith_bandwidth(
      typename graph_traits< Graph >::vertex_descriptor i, const Graph& g)
  {
      return ith_bandwidth(i, g, get(vertex_index, g));
  }
  
  template < typename Graph, typename VertexIndexMap >
  typename graph_traits< Graph >::vertices_size_type bandwidth(
      const Graph& g, VertexIndexMap index)
  {
      BOOST_USING_STD_MAX();
      using std::abs;
      typedef
          typename graph_traits< Graph >::vertices_size_type vertices_size_type;
      vertices_size_type b = 0;
      typename graph_traits< Graph >::edge_iterator i, end;
      for (boost::tie(i, end) = edges(g); i != end; ++i)
      {
          int f_i = get(index, source(*i, g));
          int f_j = get(index, target(*i, g));
          b = max BOOST_PREVENT_MACRO_SUBSTITUTION(
              b, vertices_size_type(abs(f_i - f_j)));
      }
      return b;
  }
  
  template < typename Graph >
  typename graph_traits< Graph >::vertices_size_type bandwidth(const Graph& g)
  {
      return bandwidth(g, get(vertex_index, g));
  }
  
  template < typename Graph, typename VertexIndexMap >
  typename graph_traits< Graph >::vertices_size_type edgesum(
      const Graph& g, VertexIndexMap index_map)
  {
      typedef typename graph_traits< Graph >::vertices_size_type size_type;
      typedef
          typename detail::numeric_traits< size_type >::difference_type diff_t;
      size_type sum = 0;
      typename graph_traits< Graph >::edge_iterator i, end;
      for (boost::tie(i, end) = edges(g); i != end; ++i)
      {
          diff_t f_u = get(index_map, source(*i, g));
          diff_t f_v = get(index_map, target(*i, g));
          using namespace std; // to call abs() unqualified
          sum += abs(f_u - f_v);
      }
      return sum;
  }
  
  } // namespace boost
  
  #endif // BOOST_GRAPH_BANDWIDTH_HPP