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 |
101 |