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1 | // Boost.Range library |
2 | // | |
3 | // Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. Use, modification and | |
4 | // distribution is subject to the Boost Software License, Version | |
5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | // | |
8 | // For more information, see http://www.boost.org/libs/range/ | |
9 | // | |
10 | ||
11 | #ifndef BOOST_RANGE_ADAPTOR_INDIRECTED_HPP | |
12 | #define BOOST_RANGE_ADAPTOR_INDIRECTED_HPP | |
13 | ||
14 | #include <boost/range/iterator_range.hpp> | |
15 | #include <boost/range/concepts.hpp> | |
16 | #include <boost/iterator/indirect_iterator.hpp> | |
17 | ||
18 | namespace boost | |
19 | { | |
20 | namespace range_detail | |
21 | { | |
22 | template< class R > | |
23 | struct indirected_range : | |
24 | public boost::iterator_range< | |
25 | boost::indirect_iterator< | |
26 | BOOST_DEDUCED_TYPENAME range_iterator<R>::type | |
27 | > | |
28 | > | |
29 | { | |
30 | private: | |
31 | typedef boost::iterator_range< | |
32 | boost::indirect_iterator< | |
33 | BOOST_DEDUCED_TYPENAME range_iterator<R>::type | |
34 | > | |
35 | > | |
36 | base; | |
37 | ||
38 | public: | |
39 | explicit indirected_range( R& r ) | |
40 | : base( r ) | |
41 | { } | |
42 | }; | |
43 | ||
44 | struct indirect_forwarder {}; | |
45 | ||
46 | template< class SinglePassRange > | |
47 | inline indirected_range<SinglePassRange> | |
48 | operator|( SinglePassRange& r, indirect_forwarder ) | |
49 | { | |
50 | BOOST_RANGE_CONCEPT_ASSERT(( | |
51 | SinglePassRangeConcept<SinglePassRange>)); | |
52 | ||
53 | return indirected_range<SinglePassRange>( r ); | |
54 | } | |
55 | ||
56 | template< class SinglePassRange > | |
57 | inline indirected_range<const SinglePassRange> | |
58 | operator|( const SinglePassRange& r, indirect_forwarder ) | |
59 | { | |
60 | BOOST_RANGE_CONCEPT_ASSERT(( | |
61 | SinglePassRangeConcept<const SinglePassRange>)); | |
62 | ||
63 | return indirected_range<const SinglePassRange>( r ); | |
64 | } | |
65 | ||
66 | } // 'range_detail' | |
67 | ||
68 | using range_detail::indirected_range; | |
69 | ||
70 | namespace adaptors | |
71 | { | |
72 | namespace | |
73 | { | |
74 | const range_detail::indirect_forwarder indirected = | |
75 | range_detail::indirect_forwarder(); | |
76 | } | |
77 | ||
78 | template<class SinglePassRange> | |
79 | inline indirected_range<SinglePassRange> | |
80 | indirect(SinglePassRange& rng) | |
81 | { | |
82 | BOOST_RANGE_CONCEPT_ASSERT(( | |
83 | SinglePassRangeConcept<SinglePassRange>)); | |
84 | return indirected_range<SinglePassRange>(rng); | |
85 | } | |
86 | ||
87 | template<class SinglePassRange> | |
88 | inline indirected_range<const SinglePassRange> | |
89 | indirect(const SinglePassRange& rng) | |
90 | { | |
91 | BOOST_RANGE_CONCEPT_ASSERT(( | |
92 | SinglePassRangeConcept<const SinglePassRange>)); | |
93 | ||
94 | return indirected_range<const SinglePassRange>(rng); | |
95 | } | |
96 | } // 'adaptors' | |
97 | ||
98 | } | |
99 | ||
100 | #endif |