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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2014, Oracle and/or its affiliates.
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
// Licensed under the Boost Software License version 1.0.
// http://www.boost.org/users/license.html
#ifndef BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP
#define BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP
#include <boost/mpl/assert.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/iterator/iterator_facade.hpp>
#include <boost/iterator/iterator_categories.hpp>
namespace boost { namespace geometry
{
template
<
typename Iterator1,
typename Iterator2,
typename Value,
typename Reference = Value&
>
class concatenate_iterator
: public boost::iterator_facade
<
concatenate_iterator<Iterator1, Iterator2, Value, Reference>,
Value,
boost::bidirectional_traversal_tag,
Reference
>
{
private:
Iterator1 m_it1, m_end1;
Iterator2 m_begin2, m_it2;
public:
typedef Iterator1 first_iterator_type;
typedef Iterator2 second_iterator_type;
// default constructor
concatenate_iterator() {}
// for begin
concatenate_iterator(Iterator1 it1, Iterator1 end1,
Iterator2 begin2, Iterator2 it2)
: m_it1(it1), m_end1(end1), m_begin2(begin2), m_it2(it2)
{}
// for end
concatenate_iterator(Iterator1 end1, Iterator2 begin2, Iterator2 end2)
: m_it1(end1), m_end1(end1), m_begin2(begin2), m_it2(end2)
{}
template
<
typename OtherIt1,
typename OtherIt2,
typename OtherValue,
typename OtherReference
>
concatenate_iterator(concatenate_iterator
<
OtherIt1,
OtherIt2,
OtherValue,
OtherReference
> const& other)
: m_it1(other.m_it1)
, m_end1(other.m_end1)
, m_begin2(other.m_begin2)
, m_it2(other.m_it2)
{
static const bool are_conv
= boost::is_convertible<OtherIt1, Iterator1>::value
&& boost::is_convertible<OtherIt2, Iterator2>::value;
BOOST_MPL_ASSERT_MSG((are_conv),
NOT_CONVERTIBLE,
(types<OtherIt1, OtherIt2>));
}
private:
friend class boost::iterator_core_access;
template <typename It1, typename It2, typename V, typename R>
friend class concatenate_iterator;
inline Reference dereference() const
{
if ( m_it1 == m_end1 )
{
return *m_it2;
}
return *m_it1;
}
template
<
typename OtherIt1,
typename OtherIt2,
typename OtherValue,
typename OtherReference
>
inline bool equal(concatenate_iterator
<
OtherIt1,
OtherIt2,
OtherValue,
OtherReference
> const& other) const
{
return m_it1 == other.m_it1 && m_it2 == other.m_it2;
}
inline void increment()
{
if ( m_it1 == m_end1 )
{
++m_it2;
}
else
{
++m_it1;
}
}
inline void decrement()
{
if ( m_it2 == m_begin2 )
{
--m_it1;
}
else
{
--m_it2;
}
}
};
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP
|
