1//
2//=======================================================================
3// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
4// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
5//
6// Distributed under the Boost Software License, Version 1.0. (See
7// accompanying file LICENSE_1_0.txt or copy at
8// http://www.boost.org/LICENSE_1_0.txt)
9//=======================================================================
10
11#ifndef BOOST_GRAPH_DETAIL_EDGE_HPP
12#define BOOST_GRAPH_DETAIL_EDGE_HPP
13
14#include <iosfwd>
15
16#include <boost/functional/hash.hpp>
17
18namespace boost
19{
20
21namespace detail
22{
23
24 template < typename Directed, typename Vertex > struct edge_base
25 {
26 inline edge_base() {}
27 inline edge_base(Vertex s, Vertex d) : m_source(s), m_target(d) {}
28 Vertex m_source;
29 Vertex m_target;
30 };
31
32 template < typename Directed, typename Vertex >
33 class edge_desc_impl : public edge_base< Directed, Vertex >
34 {
35 typedef edge_desc_impl self;
36 typedef edge_base< Directed, Vertex > Base;
37
38 public:
39 typedef void property_type;
40
41 inline edge_desc_impl() : m_eproperty(0) {}
42
43 inline edge_desc_impl(Vertex s, Vertex d, const property_type* eplug)
44 : Base(s, d), m_eproperty(const_cast< property_type* >(eplug))
45 {
46 }
47
48 property_type* get_property() { return m_eproperty; }
49 const property_type* get_property() const { return m_eproperty; }
50
51 // protected:
52 property_type* m_eproperty;
53 };
54
55 template < class D, class V >
56 inline bool operator==(const detail::edge_desc_impl< D, V >& a,
57 const detail::edge_desc_impl< D, V >& b)
58 {
59 return a.get_property() == b.get_property();
60 }
61 template < class D, class V >
62 inline bool operator!=(const detail::edge_desc_impl< D, V >& a,
63 const detail::edge_desc_impl< D, V >& b)
64 {
65 return !(a.get_property() == b.get_property());
66 }
67
68 // Order edges according to the address of their property object
69 template < class D, class V >
70 inline bool operator<(const detail::edge_desc_impl< D, V >& a,
71 const detail::edge_desc_impl< D, V >& b)
72 {
73 return a.get_property() < b.get_property();
74 }
75 template < class D, class V >
76 inline bool operator<=(const detail::edge_desc_impl< D, V >& a,
77 const detail::edge_desc_impl< D, V >& b)
78 {
79 return a.get_property() <= b.get_property();
80 }
81 template < class D, class V >
82 inline bool operator>(const detail::edge_desc_impl< D, V >& a,
83 const detail::edge_desc_impl< D, V >& b)
84 {
85 return a.get_property() > b.get_property();
86 }
87 template < class D, class V >
88 inline bool operator>=(const detail::edge_desc_impl< D, V >& a,
89 const detail::edge_desc_impl< D, V >& b)
90 {
91 return a.get_property() >= b.get_property();
92 }
93
94} // namespace detail
95
96} // namespace boost
97
98namespace std
99{
100template < class Char, class Traits, class D, class V >
101std::basic_ostream< Char, Traits >& operator<<(
102 std::basic_ostream< Char, Traits >& os,
103 const boost::detail::edge_desc_impl< D, V >& e)
104{
105 return os << "(" << e.m_source << "," << e.m_target << ")";
106}
107}
108
109// Boost's functional/hash
110namespace boost
111{
112template < typename D, typename V >
113struct hash< boost::detail::edge_desc_impl< D, V > >
114{
115 std::size_t operator()(const boost::detail::edge_desc_impl< D, V >& x) const
116 {
117 return hash_value(x.get_property());
118 }
119};
120}
121
122#endif // BOOST_GRAPH_DETAIL_DETAIL_EDGE_HPP
123