1// Copyright Neil Groves 2010. Use, modification and
2// distribution is subject to the Boost Software License, Version
3// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
4// http://www.boost.org/LICENSE_1_0.txt)
5//
6//
7// For more information, see http://www.boost.org/libs/range/
8//
9#ifndef BOOST_RANGE_ANY_RANGE_HPP_INCLUDED
10#define BOOST_RANGE_ANY_RANGE_HPP_INCLUDED
11
12#include <boost/config.hpp>
13#include <boost/iterator/iterator_categories.hpp>
14#include <boost/iterator/iterator_traits.hpp>
15#include <boost/iterator/iterator_facade.hpp>
16#include <boost/iterator/iterator_adaptor.hpp>
17#include <boost/range/detail/any_iterator.hpp>
18#include <boost/range/concepts.hpp>
19#include <boost/range/reference.hpp>
20#include <boost/range/value_type.hpp>
21#include <boost/range/iterator_range_core.hpp>
22
23namespace boost
24{
25 namespace range_detail
26 {
27 // If T is use_default, return the result of Default, otherwise
28 // return T.
29 //
30 // This is an implementation artifact used to pick intelligent default
31 // values when the user specified boost::use_default as a template
32 // parameter.
33 template<
34 class T,
35 class Default
36 >
37 struct any_range_default_help
38 : mpl::eval_if<
39 is_same<T, use_default>
40 , Default
41 , mpl::identity<T>
42 >
43 {
44 };
45
46 template<
47 class WrappedRange
48 , class Value
49 , class Reference
50 >
51 struct any_range_value_type
52 {
53# ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY
54 typedef typename any_range_default_help<
55 Value
56 , mpl::eval_if<
57 is_same<Reference, use_default>
58 , range_value<
59 typename remove_const<WrappedRange>
60 ::type>
61 , remove_reference<Reference>
62 >
63 >::type type;
64# else
65 typedef typename any_range_default_help<
66 Value
67 , range_value<
68 typename remove_const<WrappedRange>
69 ::type>
70 >::type type;
71# endif
72 };
73
74 template<
75 class Value
76 , class Traversal
77 , class Reference = Value&
78 , class Difference = std::ptrdiff_t
79 , class Buffer = use_default
80 >
81 class any_range
82 : public iterator_range<
83 any_iterator<
84 Value
85 , Traversal
86 , Reference
87 , Difference
88 , typename any_range_default_help<
89 Buffer
90 , mpl::identity<any_iterator_default_buffer>
91 >::type
92 >
93 >
94 {
95 typedef iterator_range<
96 any_iterator<
97 Value
98 , Traversal
99 , Reference
100 , Difference
101 , typename any_range_default_help<
102 Buffer
103 , mpl::identity<any_iterator_default_buffer>
104 >::type
105 >
106 > base_type;
107
108 struct enabler {};
109 struct disabler {};
110 public:
111 any_range()
112 {
113 }
114
115 any_range(const any_range& other)
116 : base_type(other)
117 {
118 }
119
120 template<class WrappedRange>
121 any_range(WrappedRange& wrapped_range)
122 : base_type(boost::begin(wrapped_range),
123 boost::end(wrapped_range))
124 {
125 }
126
127 template<class WrappedRange>
128 any_range(const WrappedRange& wrapped_range)
129 : base_type(boost::begin(wrapped_range),
130 boost::end(wrapped_range))
131 {
132 }
133
134 template<
135 class OtherValue
136 , class OtherTraversal
137 , class OtherReference
138 , class OtherDifference
139 >
140 any_range(const any_range<
141 OtherValue
142 , OtherTraversal
143 , OtherReference
144 , OtherDifference
145 , Buffer
146 >& other)
147 : base_type(boost::begin(other), boost::end(other))
148 {
149 }
150
151 template<class Iterator>
152 any_range(Iterator first, Iterator last)
153 : base_type(first, last)
154 {
155 }
156 };
157
158 template<
159 class WrappedRange
160 , class Value = use_default
161 , class Traversal = use_default
162 , class Reference = use_default
163 , class Difference = use_default
164 , class Buffer = use_default
165 >
166 struct any_range_type_generator
167 {
168 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<WrappedRange> ));
169 typedef any_range<
170 typename any_range_value_type<
171 WrappedRange
172 , Value
173 , typename any_range_default_help<
174 Reference
175 , range_reference<WrappedRange>
176 >::type
177 >::type
178 , typename any_range_default_help<
179 Traversal
180 , iterator_traversal<
181 typename range_iterator<WrappedRange>::type
182 >
183 >::type
184 , typename any_range_default_help<
185 Reference
186 , range_reference<WrappedRange>
187 >::type
188 , typename any_range_default_help<
189 Difference
190 , range_difference<WrappedRange>
191 >::type
192 , typename any_range_default_help<
193 Buffer
194 , mpl::identity<any_iterator_default_buffer>
195 >::type
196 > type;
197 };
198 } // namespace range_detail
199
200 using range_detail::any_range;
201 using range_detail::any_range_type_generator;
202} // namespace boost
203
204#endif // include guard
205

source code of boost/libs/range/include/boost/range/any_range.hpp