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
|
/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
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)
==============================================================================*/
#if !defined(FUSION_STD_TUPLE_ITERATOR_09112011_1905)
#define FUSION_STD_TUPLE_ITERATOR_09112011_1905
#include <boost/fusion/iterator/iterator_facade.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/fusion/support/detail/access.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/eval_if.hpp>
#include <tuple>
#include <utility>
namespace boost { namespace fusion
{
struct random_access_traversal_tag;
template <typename Tuple, int Index>
struct std_tuple_iterator_identity;
template <typename Tuple, int Index>
struct std_tuple_iterator
: iterator_facade<
std_tuple_iterator<Tuple, Index>
, random_access_traversal_tag>
{
typedef Tuple tuple_type;
static int const index = Index;
typedef std_tuple_iterator_identity<
typename add_const<Tuple>::type, Index>
identity;
explicit std_tuple_iterator(Tuple& tuple)
: tuple(tuple) {}
Tuple& tuple;
template <typename Iterator>
struct value_of
: std::tuple_element<Iterator::index,
typename remove_const<typename Iterator::tuple_type>::type> {};
template <typename Iterator>
struct deref
{
typedef value_of<Iterator> element;
typedef typename
mpl::eval_if<
is_const<typename Iterator::tuple_type>
, fusion::detail::cref_result<element>
, fusion::detail::ref_result<element>
>::type
type;
static type
call(Iterator const& iter)
{
return std::get<Index>(iter.tuple);
}
};
template <typename Iterator, typename N>
struct advance
{
static int const index = Iterator::index;
typedef typename Iterator::tuple_type tuple_type;
typedef std_tuple_iterator<tuple_type, index+N::value> type;
static type
call(Iterator const& i)
{
return type(i.tuple);
}
};
template <typename Iterator>
struct next : advance<Iterator, mpl::int_<1>> {};
template <typename Iterator>
struct prior : advance<Iterator, mpl::int_<-1>> {};
template <typename I1, typename I2>
struct equal_to
: is_same<typename I1::identity, typename I2::identity> {};
template <typename First, typename Last>
struct distance
{
typedef mpl::int_<Last::index-First::index> type;
static type
call(First const&, Last const&)
{
return type();
}
};
};
}}
#endif
|
