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:
indirected_rangeboost::range_detail::indirected_range39             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>
operator |(SinglePassRange & r,indirect_forwarder)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>
operator |(const SinglePassRange & r,indirect_forwarder)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>
indirect(SinglePassRange & rng)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>
indirect(const SinglePassRange & rng)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